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ToySnakePMC 02-06-2016 06:09 AM

Curious as well how the auxiliary, or tender, spring works for ya. The first time I installed my V-Maxx coilovers, I used that spring and the other standard spring that came with the shocks on my V8M..., and as soon as I sat the car on its on weight, those tender springs stayed fully compressed. I then installed the FM V8 optional springs on the fronts that eliminates the tender spring. You may have different results though.

BTW, the exhaust is looking fantabulous!

stng_96 02-15-2016 09:44 AM

40 Attachment(s)
So as most of the big things on this car have come together, my update here will consist of several small things that either needed finished, or done completely. Papabear, to answer your question about modifying the fitting for the power steering, I now have a couple tid-bits of information. First, as it turns out, the high pressure side of my 2002 F-body PS pump uses a 16x1.5mm thread fitting. It is the one that FM recommends you use an inverted flair for, see the picture here, which has the factory GM hose/fitting next to it for comparison.

https://www.v8miata.net/attachment.p...ine=1455551079

Here it is by itself, out of the packaging.

https://www.v8miata.net/attachment.p...ine=1455551079

The 1991 miata rack that I am using ended up using the exact same thread size,16x1.5mm. I don't really know where the 20x1.5mm number came from on FM's site, but I did not use it. I'll just add those parts to the ever growing pile of mistakenly ordered parts. Now, by another mistake I had received two of the AFCO fittings that were the proper thread pitch, so here comes the modification I made to one of them to fit the miata rack. You saw the inverted flare that it came with, I shaved down the end of it, and used a drill bit to convert it to a concave flare that would match the line that came out of the miata rack. Nothing too exciting, see this picture. It seated very nicely, I think it will be fine.

https://www.v8miata.net/attachment.p...ine=1455551079

https://www.v8miata.net/attachment.p...ine=1455551079

Now that I have the fittings on, The hose was a thing of beauty. While I was putting it on, I could see the value in possibly having a 90 degree fitting that will make it turn out and down from the pump, but not necessary, my hose tucked right up against the water pump and the length was close to perfect, perhaps just a bit long.

https://www.v8miata.net/attachment.p...ine=1455551079

https://www.v8miata.net/attachment.p...ine=1455551079

Also got the universal cooler mounted up. It was very straightforward, no issues here, except where I dented a few fins. As far as the lines, the one that goes to the resevoir is pretty straightforward. The one that comes from the rack to the cooler is interesting. It has a large banjo style fitting coming out of it, with a 3/8" tube that on the miata sticks up. I used my handy tubing bender and changed its direction to work better with my setup. Picture is blurry, sorry!

https://www.v8miata.net/attachment.p...ine=1455551079

https://www.v8miata.net/attachment.p...ine=1455551079

Now it was time to get the exhaust finished up. I changed my mind about six times while I was finishing this portion, I could have cut up the C5 system and had it exit at the sides of the rear, but I ended up leaving it center exit because it fit very nicely as it was, and I like it quite a bit now. Here is a picture of what I will call my midpipe, from right behind the trans mount, to the inlet of the C5 catback.

https://www.v8miata.net/attachment.p...ine=1455551079

And on the car, when I bought it it actually had some nice stainless clamps from right in front of the mufflers, but I have misplaced them so I just picked up some basic muffler u-bolt clamps. As you can see, I had to trim the bumper a little bit to make it look right, but all in all I am very happy with how it all turned out. The tips are not perfect right now, I will probably end up cutting them off, and extending them out a little more, but this gives you a good idea at least. Sorry for the poor quality pictures, the wall of my barn is only a few feet from the back of the car, so I couldn't get a great shot.

https://www.v8miata.net/attachment.p...ine=1455551079

https://www.v8miata.net/attachment.p...ine=1455551079

https://www.v8miata.net/attachment.p...ine=1455551079

I did start it once to see what it sounded like, but right against the wall is really hard to gauge. It is definitely tight, but nothing is touching anywhere, fit almost like it was made for it. Tips look to be pointed down in this picture, I will adjust that later. Notice my shop helper in the background, he is mad that he only got to play in the snow for about 3 hours yesterday, instead of the whole day!

https://www.v8miata.net/attachment.p...ine=1455551079

While I was under the car I decided to go ahead and install my new one way check valve on the fuel tank vent. I bought a nice little piece on ebay, made by UPR, here is the link:

Upr 10mm Non Return One Way 3 8 inch Air Fuel Oil Check Valve Diesel Gas Black | eBay

And here is the valve, nice little piece if you ask me:

https://www.v8miata.net/attachment.p...ine=1455551079

I actually made them a counteroffer and got it for $12. Anyways, I had ran a 3/8" rubber vent line from the vent on the top of the tank when I still had it out. From there, I routed it to the location right in front of the passenger rear wheel. I then took the mounting bracket for the factory miata charcoal canister, modified and painted it, and mounted it at this location in front of the rear passenger wheel. You can see the check valve just in front of the canister inlet. This obviously won't use the PCM management system to regulate, it will just leave the gas tank open to the canister at all times, but that won't cause any trouble. I actually already had all that system turned off on my computer flash.

https://www.v8miata.net/attachment.p...ine=1455551079

https://www.v8miata.net/attachment.p...ine=1455551079

From there, I cleaned up and painted my stock rear calipers to match the wilwoods up front. I'm not much on really flashy brakes, so flat black is just fine for me. If you haven't changed miata brakes before, I suggest you read about how to do it upfront. I have changed many sets of brakes, on many vehicles, and I set and fought the piston on the rear calipers for at least an hour before I figured broke down and read about them. There is an adjustment screw hidden under a 14mm bolt that you have to manipulate to get the piston to retract......Anyway, got them cleaned up, painted, pads on, stainless lines installed, and then I have a problem. I got FM's adapter brackets to make the standard 1.8 calipers work with sport rotors. The problem is that when I put them on, the ebrake cable is not long enough to work anymore. I'm going to call them today, but as of that point, I decided it was time to hold up for a little while.

https://www.v8miata.net/attachment.p...ine=1455551079

https://www.v8miata.net/attachment.p...ine=1455551079

https://www.v8miata.net/attachment.p...ine=1455551079

And with the wheel in place, the camera flash really shows how dirty everything is!!!

https://www.v8miata.net/attachment.p...ine=1455551079


That's about all for this update that has any real substance. I spent a fair amount of time lately fixing small little gremlins, or things I just hadn't finished. For example, wired in the OBDII port, cleaned up the fan wiring, etc. I am getting more and more worried that I will have the car ready to go, and I will have no tires to put on it. I sold the factory 15's, and the only spares I have are 14's which won't fit over my brakes.....May be waiting a bit.

stng_96 02-17-2016 08:45 PM

So after what I will call a pretty good long streak of no problems, I have run into one.....I was out messing with the car earlier, decided since I had the exhaust on now, everything is wired, etc, I would go ahead and start her up and let run for a while and ensure that the fans kicked on as they should. Started her up for probably the 5th time just as usual, and she ran smoothly for probably a minute or so before dying......Now she has died on me a few times, but I always attributed that to the fact that the cam is a little more then the factory tune can handle. Well this time it just sputtered out suddenly, and I when I went to restart it, it fired and then immediately died. It did it over and over again. Every time, fired just fine, and died. I unhooked the battery to reset it, pulled the fuel rail connection and made sure i was getting plenty of flow, checked grounds, etc., but still the same thing. I am thinking it is a fuel issue, because it runs a little longer with a quick shot of carb cleaner in the TB. Anyone have any ideas? My first instinct is that maybe something in the fuel tank(looked very clean when I installed the pump) knocked loose and is clogging the filter, which is why it fires fine when its primed, but then dies.

charchri4 02-17-2016 08:48 PM

Pick up a fuel pressure gauge that goes on the fuel rail and see what you have there. That will rule out a whole lot of things right away and for 30 bucks a handy thing to keep around.

stng_96 02-17-2016 09:12 PM

yeah that was actually my plan tomorrow, tonight was as much of a drink a beer and scratch my head event as it was anything else. Hopefully there is a enough room between the schrader valve and the firewall since I turned the fuel rail around

Good to hear from you Jim, haven't seen much of you lately.

charchri4 02-18-2016 10:31 AM

LOL I think ever builder has spent his fair share of time starring at the car with a beer in his hand pondering on a dilemma!

Oh I just don't want to plug up this amazing build thread with useless babble because yours is one of the finest builds and certainly best documented to grace these pages in a long time. Well that and all I ever think to say is why didn't I do it that way?!

I about peed in my pants over your CME and am super jealous of it! I looked long and hard for a way to do that and nothing more sexy out back than CMEs. She's probably going to be a bit loud but those boalas are going to have an amazing exhaust note! Not that anyone would ever hear it for long though...

papabear 02-18-2016 11:02 AM

Glad to see you got your power steering all worked out. I really like the look of how the exhaust is run. It should sound good with the Bolra's. You are really making nice progress with this build.

stng_96 02-21-2016 10:07 AM

Well, I have a new problem....the car runs fine again....and I don't know why! I was out ready to hook up the fuel pressure gauge yesterday, and I started it beforehand to check.....ran and ran and ran.

Dave Tibbitts 02-21-2016 10:10 AM

Are you using the Miata relay/wiring to power the fuel pump?

stng_96 02-21-2016 10:31 AM

Yes I am

Shrimpy59 02-21-2016 11:07 AM

I really don't think it is cam related because I have run a lot of miles with a stock tune and way not stock cam in mine. But the computer does have to learn and adapt and mine still stumbles at idle after the car has been off battery for a long time. You may be fine. Do pick up a spare main relay or 2 and keep them with you but other than that I'd consider the problem solved. LOL yeah I know... but hey in 20,000 miles I have only walked away from it once and I could have avoided that if it was not such a nice morning for a walk!

stng_96 02-21-2016 11:10 AM

I don't think its cam either, that has made it sputter a few times, but this was different. I don't think i was the fuel relay either, pump still primed just fine. We will see I guess.

Dave Tibbitts 02-21-2016 11:36 AM

I had an issue with mine where the factory wiring couldn't carry enough current to supply the new pump. I ended up making a new sub-harness, in the trunk to pull power from the battery and send it to a new 30A relay and then to a 10 gauge wire to the pump.

stng_96 02-29-2016 08:20 PM

So after a few days of having that problem, it went away completely, and car would run like it should without fault.....now a week later....its back

charchri4 02-29-2016 10:10 PM

Just shuts off or stumbles? Maybe you want to start a new thread out of the build thread so more guys would see it.

stng_96 03-01-2016 07:15 AM

Both, has stumbled a bit, has just not even tried. I started a thread on LS1tech in the swap section to see if anyone there had any advice.

ToySnakePMC 03-04-2016 05:58 AM

For a short time, I suffered through an intermittent problem with a simply bad Mazda elec connector on top of fuel pump. Worked fine most times and sometimes no start with no prime going on. I had previously damaged the Female end with multimeter probe. New/ used female connector was the 100% fix...

stng_96 03-04-2016 07:24 AM

Yeah I am sure its a bad connection or sensor somewhere, but I don't believe it is before the injectors. I hooked up a fuel pressure gauge and had a solid 60 psi pressure reading before start, through crank/fire and when it died.

charchri4 03-06-2016 06:04 AM

Did the fuel pressure drop when it died?

stng_96 03-06-2016 08:23 AM

Nope, if it did it was only for a split second and not notable because the pump primed again. I unhooked the battery over night two nights ago, and it fired up and ran yesterday......I don't know guys. I ordered a Blue tooth OBDII scanner to work with my smartphone this week, hopefully as soon as that comes in I will be able to get some data. If not then I will probably just drag it to the tuner and see what they can tell me. My tires should be in this week, or next. After I get them in I'll get it aligned and make an apt to get it tuned in a couple weeks.

stng_96 03-10-2016 09:05 AM

Big update coming soon, got my tires yesterday!

ItsAllRigged 03-10-2016 09:13 AM

Exciting! Youre gonna love it.

stng_96 03-14-2016 08:22 AM

1 Attachment(s)
Still don't have that big update, but I do have a picture from the end of the weekend....

https://www.v8miata.net/attachment.p...ine=1457961725

papabear 03-14-2016 08:46 AM

Car is really coming along. What tires are you running?

stng_96 03-14-2016 09:02 AM

RS3's, If it was going to be a few more weeks before I was ready to get her out I would have canceled my order and got the new Maxxis VR-1's, but these are already here, and they are pretty well proven at this point. I ordered them two months ago now, tirerack finally has them in again.

stng_96 03-21-2016 09:03 AM

44 Attachment(s)
Update time:

It's been quite some time since my last big update, and as I set here and reflect on what I have done since then, I realize more and more that the pictures here will be much more exciting, most of the work I have competed as of recently is just little tid bits that had to be nailed down. Off we go....

As I had noted in the past, I had to opportunity to canabalize some FM VMaxx's that were on my last parts car. One of them was bent, so I saved the tinder springs and collars for my own build. Installed them as you can see here:

https://www.v8miata.net/attachment.p...ine=1458569025

I still really like the idea of a tinder spring, but what this suspension novice overlooked was the fact that I bought 7" coils for my DIY coilover setup, which were planned to be run alone. Once I finally got the tires in and on the wheels i put them on the car and put her on the ground. As some others have stated, the tinder springs immediately compressed completely which I was ok with, however my big problem is that the car had at least 3" of distance between the top of the tire and the fender, looked like I was ready to go off roading.


https://www.v8miata.net/attachment.p...ine=1458569025

https://www.v8miata.net/attachment.p...ine=1458569025

In the end I removed the tinder springs and all is well in the world. I was nervous about coil droop from my own bits of looking, but after reading around I am now confident this setup will work fine for me.



One of the things I have been trying to do is keep my engine bay clean and empty. For instance, I put the computer in the passenger airbag location, I will not run and winshield washer fluid bottle, and I also will hide my coolant overflow resevoir. I picked up this little jem from Summit racing for 16.97, it is a overflow res. for racing applications.

https://www.v8miata.net/attachment.p...ine=1458569025

https://www.v8miata.net/attachment.p...ine=1458569025

its a nice little piece, seems to be tough as nails. I got it because it was small enough that I knew I could probably hide it without much trouble. The only thing I changed is I added a dip tube that will go to the bottom of the bottle to pick up fluid in the case that it is actually used. After doing a good amount of looking, I decided to mount it just below the drivers headlight.

https://www.v8miata.net/attachment.p...ine=1458569025

https://www.v8miata.net/attachment.p...ine=1458569025

https://www.v8miata.net/attachment.p...ine=1458569025

worked great, just had to do a small amount of fender liner trimming but you will never even see that. Installed the rest of the fender liner and boy look at that, or I guess, don't look at that! It comes standard with 1/4 fittings, ready to hook your lines up. Much better with one less white/yellowish container under there:

https://www.v8miata.net/attachment.p...ine=1458569025

Took the car for an alignment last friday, ran well enough to get on the trailer and into the shop. Good lord this thing is an attention MAGNET! When I pulled it in the shop, the world basically set still, in the shop, and in the customer waiting room. Before I took it though, I had to get the headlights/hood on, wasn't going to have it go to anywhere without them. I baked the headlights open in the wifes oven, which she was suprisingly ok with, and I removed the amber lense/painted the bezels black. I personally thing they turned out fantastic. I also installed my aerocatch latches which was a bit nerve racking, but here we are.

https://www.v8miata.net/attachment.p...ine=1458569025

https://www.v8miata.net/attachment.p...ine=1458569025

Not completely finished with them but I am close. I had them on loosely, but well enough to keep the hood down on the trailer. I actually took the pins back out and they are getting powdercoated black at the top, along with a handful of other small things. I'll take the bumper back off and install them when they come back, along with a trimmed up air duct for the mouth.

I also started on some door cards, if you remember correctly I built in some door bars and as such I am putting together a set of cards. Since I had a few sets of door panels laying around and a spare NB door, I figured I would try these and if they didn't work out I'd try something else. I like the look of the ones build with NA tops, but I like the look of the NB tops better so I thought I would give those a try first. Bought a sheet of HPDE plastic, 1/8" thick from Menards. It was special order since they only keep 1/4" in stock, but in the end the 4'x8' sheet, and two pieces of MDF/particle board that they used to pack it with only cost me $46, so that was good. I will have a fair amount of excess, some of which I will use to build a splitter for the front. Pictures tell most of the story here. I cut the NB panels to my liking, made a cardboard template for the rest, trimmed, cut, etc. I used spray foam insulation to make up the gap and trimmed it. I also decided to drill my own holes, instead of trying to make the factory ones work for me. It just seem much easier to get everything lined up that way. Still a work in progress, more to come on those.

https://www.v8miata.net/attachment.p...ine=1458569025

https://www.v8miata.net/attachment.p...ine=1458569025

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Finally, I tinted the tails that I got from my mother in law's miata. I was planning on buying a set of 01-05 tail lights and she just said I should trade mine for the ones on her 02. She can't tell the difference, so thats what I did. This is definitely more show than go, but I am going for an all black/blue look on this car. I sprayed a light coat of nightshades on here and wet sanded with 2000, then buffed them up. I think they look great, especially on the car which sadly I don't have a picture of.

https://www.v8miata.net/attachment.p...ine=1458569025

Like I said at the beginning of this post, many more little things were accomplished since my last update, but in a lot of cases they were taking things back out and repairing problems I had found, like one gauge light that was not working. I also bought two more parts miatas, both in running condition.

https://www.v8miata.net/attachment.p...ine=1458569025

https://www.v8miata.net/attachment.p...ine=1458569025

Thats about all for now. I will be calling this morning to make my tuning appointment, so hopefully the next update you see will have that event on it. :skid:

SupaDupaSteve 03-21-2016 07:23 PM

Looking good! Can't wait to see it at the mitty.

stng_96 04-04-2016 10:12 AM

Well, After a long drawn out debacle I finally have an appointment to get my car tuned. As it turns out, spring is tuning season for all the guys getting ready to race this year.....who would have thought......

As I am getting it prepared to go, I learned something new.....I have been fighting back and forth with my obdII scanner, as it wouldn't connect to the computer. I had power, and two grounds like I was supposed to, and I had connected the Serial Buss 2 line from the GM computer to the port, all should have been well right? I thought so, but it woudn't connect. I ended up pulling the dash out of the car again reluctantly, and I made a temp obdII port for testing purposes. As I was looking up some stuff for an 02 camaro, I noticed that it is pinned different than a miata is. Power and grounds were in the same spot, but the data connector wasn't. Low and behold, I moved the pin on the miata plug, and sure enough it connected just fine.....How did I miss this detail, and the better question, why isn't the data connection pin standard on all vehicles?

I don't know, but whatever the case is my scanner can see the car now, which means the tuner will be able to see the car!! Dropping it off thursday, he is busy so it may end up being a couple days before I get it back, but I can't wait!!!

stng_96 04-06-2016 09:07 AM

Got my AC lines all made up and tried to get them sucked down last night......sucked on it for two hours (good grief my lips were sore...:lol_hitting:) and closed off my valving.....bled luck a stuck hog. Went back to atmospheric on the low pressure side in just a couple minutes. I have a couple spots that were tough to get tightened, so I'll probably work on them and try again. Anyone have any tips on located inleakage at connections?

crispy 04-06-2016 04:47 PM

I usually have to add tracer dye and re-charge the system to locate any leaks. Probably not practical in this scenario. It would be nice to be able to rig up a nitrogen smoke tester. I have used this method several times for finding fine induction leaks.

Unfortunately neither of these methods is easy in the home garage.

stng_96 04-15-2016 07:23 AM

1 Attachment(s)
Tuner sent me this picture today....not to bad at all for a couple baseline runs. I do have a problem though, my fans are not kicking on......He probably won't be able to tune it much if he can't keep it cool, so I'll have to go get it, fix it, then take it back.

https://www.v8miata.net/attachment.p...ine=1460723024

97miatam 04-15-2016 07:24 AM

damn that's a lot of power!

crispy 04-15-2016 01:04 PM

There is nothing more frustrating than problems on the dyno and having to reschedule. Sorry about that misfortune. Fortunately your car set a nice baseline to work with. The next tune should be exciting.

stng_96 04-15-2016 03:44 PM

1 Attachment(s)
Well, he was able to use some fans keep it cool enough to call it good. I told him not to push it really hard, so 405 is going to probably be the final number. I am very happy with it.

https://www.v8miata.net/attachment.p...ine=1460753086

stng_96 04-19-2016 07:40 AM

Well, I went and picked the car up yesterday. I will probably end up taking it back sometime once I get the fans worked out so he can log some drive time and maybe work on the idle/driveability, but for now it is completely safe and driveable. I took it down the road just a short ways a couple times to see it go through the gears, man it felt good to actually drive the car. Remember I brought my shell home on a cart, so this was the first real drive of any sort. First impressions were actually very favorable. No doubt about it if you stomp it in first, second, or third then you can forget about holding onto the road, but when I tried a little controlled throttle the car felt like an absolute rocket.

Just my first impressions....I will have a dyno video, and some more seat time to speak of soon.

papabear 04-19-2016 08:58 AM

Congratulations car has turned out very nice. I'm sure you will run down the fan issues pretty fast.

ordonez1307 04-27-2016 06:56 AM


Originally Posted by stng_96 (Post 19821)
RS3's, If it was going to be a few more weeks before I was ready to get her out I would have canceled my order and got the new Maxxis VR-1's, but these are already here, and they are pretty well proven at this point. I ordered them two months ago now, tirerack finally has them in again.

What size are they? 225s?

stng_96 04-27-2016 08:13 AM

The RS3's I got are 225/45, the new maxxis tires are 245/40.

StacytheDeathstar 04-27-2016 10:43 PM

This car looks great love that deep blue.. Jealous you get to part out Miatas I wish I had the room to do that.. Keep up the great work

Meierznutz 04-28-2016 08:23 PM

I hate to see limited editions get chopped up but in this case you actually saved one from being scrapped. Very nice work and the car is going to be a blast for you and your wife. 405 to the wheels is a great amount of fun! Enjoy it well.... many smiles and safe miles to you

stng_96 04-29-2016 03:17 PM


Originally Posted by Meierznutz (Post 20322)
I hate to see limited editions get chopped up but in this case you actually saved one from being scrapped. Very nice work and the car is going to be a blast for you and your wife. 405 to the wheels is a great amount of fun! Enjoy it well.... many smiles and safe miles to you

You and me both. Even though there are plenty of 10AE's still out there, I can't say I was happy to figure out the PO tore apart a semi low mile car. Obviously it worked out great for me in the long run though.

stng_96 05-02-2016 11:26 AM

27 Attachment(s)
Update time:

Been a little while since my last update, last real one at least. I graduate from grad school in two weeks, and I've been parting two other miatas, and working on my car....busy but I love it!

I pretty well had my car together at the last update. Working on handful of small things trying to get it ready to get tuned. I had it completely driveable so I was trying to get the AC set up in place. I used all of the coldhose parts reccomended here by gunpilot in his thread:

https://www.v8miata.net/interior-mod...ng-my-ls-2536/

There is a lot of good info in there. I have not messed with AC much before, so this is once again something new for me. I bought all the stuff and had a local shop crimp the fittings for me. They warned me that their tool was a different brand and "may" not work, but I think that is just a formality, the crimping tools look identical on the internet. Anyway, I got all my lines marked, crimped, plumbed, and I tried to suck it down but it leaked....haven't really tried to find the leak source yet, but I will get to it. One thing that helped me was to draw the whole thing out so I could see the function. Here is what I drew up, I also wrote part numbers and descriptions to help myself when assembling everything:

https://www.v8miata.net/attachment.p...ine=1462206553

You can see in my pictures I used a red paint marker to identify where all my fittings belonged.

https://www.v8miata.net/attachment.p...ine=1462206553

https://www.v8miata.net/attachment.p...ine=1462206553

https://www.v8miata.net/attachment.p...ine=1462206553

https://www.v8miata.net/attachment.p...ine=1462206553

From there the car went to the dyno. I ended up taking it to a shop in Eddyville Ky, called Tweakin Performance. I had been searching all over the midwest area to find someone who could tune it for me. I found a couple that I liked, but they couldn't get me in for a while. This guy actually took the time to speak with me, explain his entire process, really made me feel comfortable. He was very honest, and said that he had all the software and dyno equipment needed, but he didn't have the experience he needed to feel comfortable tuning customer cars, so he is partnered with PCM of North Carolina. He logs the data, and they write the tunes. Anyway, I am very happy with the service I recieved, and the car runs great. He was not able to get it perfect because I ran into a big problem....fans didn't turn on.....I will be taking it back at a later date to get some more run time logged and hopefully get it lined out perfect. Until then she runs pretty good as is. Here is the dyno video, enjoy!


When I got her back, I learned a lot about how important it is to have your cooling system lined out. I got her down from the trailer, and wanted to take a quick spin just to say I had. I got about a mile down the road and she was getting hot, so I turned around. I had figured that there would be plenty of air moving with the car in motion so it wouldn't get hot, but it still did.....Uh oh, what have I done! I actually ended up leaving it at the end of my road for an hour or so to cool off, I was very nervous. I had planned on cutting hood vents in it, but I just hadn't got around to it at the time. I also hadn't installed the duct piece that goes behind the mouth of the front bumper. So here is what I learned......

-Under your hood is basically like a big bubble of air. If you don't have anywhere for the air to come in and out of properly, air will just go around it. This is a big problem when you are trying to cool that small block.

-Make sure you mouth duct is in place. This forces air into the radiator when you are going down the road. If you think about it, between the power steering cooler, AC condenser, and the radiator, air is essentially hitting a wall right there with limited paths to go through. If you don't direct air through it, take it from me that it won't go through.

-Make sure you give the air somewhere to go after passing through the radiator. Some of it will go back out the bottom, but there have been multiple studies done that show a dramatic pressure differential between the inside and outside of the hood, thus good vent placement on the hood is key! There is a lot of good information on Jim Stainers (Charchi4) blog, which has his info and a really good technical read using a nissan maxima. Also, GoKart (forum member) has a good write up on his vent install on his miata. His thread details different locations, and pressure points on an NB miata hood. I expect it will be similar on an NA. He is also a really good guy, I hit him up to see where he got his vent material from and he actually sold me the rest of his material for a great price, thanks bud! Both of those pages are linked here:

Jim and Jenna build diary, Miata LS1 Conversion: LS1 V8 Miata Cooling and Hood Venting 101

DIY Hood Vent - MX-5 Miata Forum

And here are some pictures of my cutting. I havne't got the vent material in yet, I cut it and sent it off for powdercoating. My cars theme is black and blue, so I am having them coated black. Here you see I used a marker, inside a bit of 3/4" sch 80 pvc. This gave me a nice uniform distance from the hood structure. I used a little electric tape to make it fit tight, not shown here.

https://www.v8miata.net/attachment.p...ine=1462206553

https://www.v8miata.net/attachment.p...ine=1462206553

I then used a high speed rotary cutter with a cutting bit and cut them out. Not saying I am completely happy with that choice, but It worked pretty well, and I think they look great! Like GoKart, I used the cut out pieces and made templates for the mesh material.

https://www.v8miata.net/attachment.p...ine=1462206553

https://www.v8miata.net/attachment.p...ine=1462206553

-Finally, Make sure your fans are working. I hadn't been able to run my car long enough untuned to get it hot enough for the fans to kick on, and sadly they did not once it got to the tuner. Long story short, I rewired the miata relays to use the LS ECM signal like you would the fuel pump signal. Bad thing is I made it wrong by doing that. Both GM and Mazda cooling fan relays use a switched ground to activate....once I got that lined out they come on and work exactly as designed. Good deal.

stng_96 05-02-2016 11:26 AM

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One other thing I had been concerned with was that I still had air in my cooling system. I have learned a lot from Jim but I really just didn't want to put a valve in my heater core lines (no offense Jim). I had been reading about different ways to clear air from a system, and I ended up coming up with my own method which I think worked really well. Some tools use a vacuum source to suck out all air in the system, similar to your AC system. I have a mityvac vacuum gun I use for brake/clutch bleeding. I also have a hydrocarbon tester that tests your cooling system for hydrocarbons(Headgasket issues). So I went to the hardware store and picked up a couple small ball valves and a T fitting. I set them up with one leg of the T going to my vacuum gun, one leg going to a jug of coolant, and one leg going to the radiator cap(I used my connector for the hydrocarbon tester here because it has a rubber cone that seals to the radiator cap. I then pulled vacuum on the system until the coolant got to the valve, and closed it off. Then I pulled a deep vacuum on the car side. The whole time I did it I could see air bubbling out of the connector. At the point where I couldn't pull anymore, all my hoses were collapsed, I opened up the valve that connected to the coolant jug, which pulled all kinds of additional coolant into the system. After doing this a couple times, I am confident that my system is air free. I went ahead and ran it with my connector in place and a little coolant in it, no more bubbles or overheating at all!! Hell yes! Don't mind my bit of rigging here:

https://www.v8miata.net/attachment.p...ine=1462206407


After that, what was I going to do? You better believe I went to drive it! Put about twenty miles on her with a pregnant co-pilot who said I can't "speed up fast". Car ran great, no scary noises, grinding, etc. I do rub somewhere when I go all the way to the right steering lock, but not the left. I will get that taken care of. I also was able to dial in my speedometer with the Dakota Digital box. Flyin miatas site still used the SGI-5C unit, which is what a bunch of people have used. Obviously they work, but I figured that I would try the newest model, the SGI-5E. It looked a bit cumbersome to me with the calibrating on the 5C, and maybe its not, but let me tell you about what I had to do to my 5E........hit one button until it was right....thats it....No multiple switches to manipulate, no issues whatsoever. I wired the box the same as the 5C is, and used one button to dial it down to match my GPS. Highly recommended.

Dakota Digital SGI-5E Universal Speedometer Signal Interfaces SGI-5E - Free Shipping on Orders Over $99 at Summit Racing

https://www.v8miata.net/attachment.p...ine=1462206407

More to come!

SupaDupaSteve 05-02-2016 08:49 PM

The way you did your coolant is how I do everything at work. I have a tool called an "air lift" and it draws the entire cooling system to a vacuum and then you suck in the coolant. Works beautifully every time, even on cars like porsche where they've got radiators up front with long coolant hoses under the car.

also, glad to hear that particular model DD works well, it's also the one I ended up getting by mistake but if it's better that makes my life easier.

stng_96 05-03-2016 08:01 AM

I can't really speak to how well the old Dakota Digital box works, but looking at the directions it seems like the initial setup is a little tough. This one wired up the exact same way, and was so easy to dial in, a caveman could do it!

97miatam 05-04-2016 07:19 AM

thanks for all of the info man! a truly exceptional build!

Meierznutz 05-06-2016 02:01 AM

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I'm glad you got your cooling system straightened out.
On my last build I drilled and taped the top of the water pump in the flat of the casting by the T-stat. It looks like that is where they put the hose on the truck style pump. Anyway, I routed the steam vent from the front of the engine to there and installed a brass T. The steam vent went into the T from the side and I used a brass valve off the top. When it was time to burp the system I would park the car nose up and fill the Rad, then open the T and add some more until I could see fluid there. Never had an issue. For giggles I opened the valve a crack when the engine was warming up but never got air so I figured it worked.

stng_96 05-09-2016 07:45 AM

2 Attachment(s)
Took the car to its first show this weekend, weather was great and I had heard this was as pretty decent sized cruise in, so why not. In the process we got to put about 150 miles on it so I was able to actually shake it down and see what I still needed to work on. My notes are as follows:

-Car is surpisingly well planted on the RS3's if you can manage it. If you just want to stomp it then forget it, but bottom line it is manageable.

-I have a little bit of wheel hop when I shift to second on hard pulls, but I didn't have a rear sway bar in place. I will put that on and see if it changes things.

-The 450/300 spring combo is excellent, car handles great, but still does not beat the hell out of you.

-The exhaust is loud if I really open it up, but its not bad at all for cruising. At about 60 I have a fair amount of drone, but it starts goes away not much higher than that.

-You haven't seen any more door panel updates because I got the first one together....3 seperate times, and have not been satisfied. I will keep working on it, but for now I trimmed a slot out of the stock panels and put them in. Looks great when the door is closed, not so much when open.

-Car made 18 mpgs in 110 miles, mostly cruising in town, with 4 hard launches to around 100.

-There is a little interferance from somewhere in the DD speedo box. If you rev the car while setting still the Speedo will jump, and sometimes it will jump setting at a light. It always goes away completely when you start moving, but it is there none the less.


At the end of the day, this car is so much fun its scary. Definitely worth all the blood, sweat, and tears. Here are a couple pics from the show:

https://www.v8miata.net/attachment.p...ine=1462797903

https://www.v8miata.net/attachment.p...ine=1462797903

john j 05-13-2016 05:17 PM

I have had the speedometer problem for five years. I just consider the problem a small annoyance and live with it.

ToySnakePMC 05-13-2016 05:48 PM

Congratulations!! Glad you can start putting some miles on the V8Roadster! Hood vents look great. I just added mine this winter, but can tell a difference when driving in city stop n go traffic. Your car is almost as beautiful as your bride!

I'm at Deals Gap, NC this weekend (got here an hour ago) and I think we need a V8Miata gathering here in the fall. ...Just saying.


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