5.0MX5

I'm considering going from my Edelbrock 625 (with Performer intake) to the new $795 standalone 400 hp FiTech Fuel Injection unit. Reason isn't that I have huge driveabliltiy problems with the carb, it drives fine, plus I've been a carb guy for 50 years, they are easy.

My problem is hot starts, most anytime after the initial start you have to spin things for many seconds due to fuel boiling in the float bowls, flooding the engine. Have the same thing with my 1970 340 Duster running a Carter AFB. Of course todays fuel is no help.

Things I've done to help the carb out is add a phnolic spacer, wrap the headers, route the fuel lines outside the frame rail away from the exhaust system and add hood vents to help cool the engine compartment. I'm sure this helped, but the problem did not go away. Oh, I also run only non-ethanol gas.

Now I see a 400 hp FiTech Fuel Injection system for $720 (after a $75 rebate) at Summit.

Anyone have any thoughts or comments?

Thanks, Ron

5.0MX5

Hit the "confirm order" button on Summit yesterday. My net research indicates FiTech is dealing with more orders than they can meet in a timely manner.....The perhaps optimistic delivery date for the FiTech Go Street 400 hp unit is May 31st.

I also ordered a few -6AN fittings along with the fuel injection hose and appropriate clamps (not worm gear) I'll use at the tank.

The plan is to run a new 3/8ths nickel copper supply line on the drivers side and utilize the current 5/16th supply line for the return.

One detail I've found conflicting information on is the flowing pressure from the 1.6 Miata fuel pump, the quoted online pressures range from 50 to 90 psig. I went to considerable trouble to run the current (5/16) supply line away from the header, outside the frame rail on the passenger side. Due to tight clearance in one area hose was used to make a connection on two pieces and with the 4 psig for the carb it's a non issue, fuel injection return pressures being greater, this'll require a rework.

Now, come on FedEx!

5.0MX5

Well, the 400 HP rated 30003 Fitech finally showed up the other day. I've been busy with life and just getting around to the installation. Have the new 3/8th supply line in place and the old supply line is now the return. Yesterday I replaced the stock fuel pump with a new stock replacement pump along with a new Wix fuel filter as "Just in case" move.

I "May" have a problem with the Summit AN-6 fittings I used on the Summit stainless PTFE hose. This is only used to transition from the hard line that goes under the car to the Fitech unit. I've started another thread for this issue and would appreciate your input.

I'll get back in the shop in the next couple of days and do the wiring and hopefully fire it up and see how it runs before the weekend is over.

Wish me luck!

5.0MX5

It runs again! I finished up most of the final details yesterday, the primary ones being installing the oxygen sensor and installing the proper stainless/PTFE tubing ends on the underhood fuel lines.

1st start was quick, I turned the key on bringing the Fitech online and it turned the fuel pump on, you can hear the fuel pump shut off after a few seconds of pressurizing the system, then engaged the starter and it spun the engine over 5 or 6 times, and it started! After a few seconds of high idle it settled into a nice 700'ish rpm idle (factory default was 900, you adjust it to your liking with a iphone size controller that shows all the important information).

I let it run long enough for the Fitech to turn the fan on and it came on at exactly 195, shutting off at my set point of 185. I'll play with those setting some while finding the best set points for keeping things below 210 while in slow/stationary traffic. I'm running a 180 degree thermostat have no cooling issues while moving. One Fitech feature is it displays underhood air temps, it'll be interesting to see just how hot it does get in the engine compartment.

If the rain stays away I'll do a test drive today and let the self learning feature start the tuning that hopefully takes care of a few niggling issues; sometimes slow to return to full idle, has to turn over 5 or 6 times to start sometimes (which is still much better than the old 30 seconds with the carb on a warm engine).

OH, throttle response is GREAT.

Air cleaner; the 3/4" spacer and going to a shorter 2" air filter did work and the big 14" Edelbrock drop base air filter fit fine.

RR

R2564952

5.0MX5

Yes it did. It should be noted I'm running a stock unmodded oil pan and had already removed the hood brace over the air cleaner.

R2564952

hotwheels000

Looking for opinions....

I have a 87 302 EFI system, really hate the look of the big upper intake.

Do you think this FiTech system would work as well or maybe even better than the stock system ?

TIA,
Devlin

R2564952

AnthonyS

hotwheels000

acedeuce802

This unit replaces a carburetor, so there is no stock EFI computer. Timing remains uncontrolled, with the distributor. If you already have EFI, I don't know why you would use this instead of just replacing the stock computer with a standalone (such as Megasquirt) or modify the stock computer with something like a Moates Quarterhorse. But I'll obviously let those with direct experience respond with why this would be a good alternative to factory (or standalone/piggyback) EFI.

R2564952

jrmotorsports55

Currently running OEM EFI with Trick Flow Stg 2 cam and heads, and cannot get the thing to run right. Found a NIB FiTech 400 setup for half price, and snagged it because the price was so good. Pretty sure I am going to pull all of the old Ford stuff out and go the FiTech route, still researching. I know I need to get a new distributor/ignition and intake manifold, anything else? I figure I can just use the OEM Mazda fuel pump/lines, and adapt them to the FiTech.

R2564952

R2564952

hotwheels000

Is there a in tank replacement for the Mazda fuel pump that fits these parameters ?

hotwheels000

A couple relays for the fans(required) and fuel pump if desired, AN fittings to adapt the Mazda lines to the fitech. I went with some EMI shieiding for the blue tach trigger wire also. Replace the fitech temp sensor with the AC Delco version, fitech sensor is known to read low which effects its tuning ability.

SoCalMike

What is the AC Delco temp sensor you are referring to? Do you have a part number by chance?

tbone heller

I would just clean the IAC valve and properly set the base idle instead of guessing and throwing money at it, but that is just me. LOL!!

jrmotorsports55

hotwheels000

AC Delco # 213-928
GM #15326386

jrmotorsports55

My FiTech 400hp kit showed up today. Can't believe how cheap I got it new in box. Still researching options, not 100% sure I'll yank out the factory FI, but I definitely like the simplicity of this unit. Will clean up the engine bay, that's for sure.

ToySnakePMC

R2564952