Dumps before axle on LS1 car? - v8 Miata Forum - Home of the v8 Miata Conversion

V8 Miata Exhaust Air In/Air Out...This area focuses on allowing your V8 Miata to exhale in the most efficient and acoustically pleasing manner possible.

Dumps before axle on LS1 car?

Old 07-28-2015, 09:47 AM
  #1  
V8 Miata Protégé
Thread Starter
 
stng_96's Avatar
 
Join Date: Feb 2015
Location: Marion Illinois
Posts: 468
Thanked 68 Times in 49 Posts
Default Dumps before axle on LS1 car?

So with all of the ls1 cars I have seen on here, I have not seen many people speak of just dumping the exhaust right before the axle. I have seen it on a few 5.0 swap cars, but never on an ls1 car. Is there a reason why no one ever does that? I have been tossing it around as a possibility, even though I really like the look of dual tips on any car. I know it would be inherently louder, but it would also eliminate the need to snake around the axles, or get the cv boots overheated.

Opinions?
stng_96 is offline  
Old 07-28-2015, 11:06 AM
  #2  
V8 Miata Participant
 
Join Date: Feb 2010
Location: Sarasota, FL
Posts: 253
Thanked 6 Times in 5 Posts
Default

The biggest issue I see, other than the noise, is ground clearance. You would have to route the pipes under the frame stiffeners, effectively losing at least 2 1/2-3" of ground clearance, not a trivial matter especially if you want the car lowered at all. Take a look at your frame stiffeners, usually there is evidence of dragging on speed bumps, etc. Rare to see perfectly smooth stiffeners. Also, since it's often an open car, the fumes can be an issue.

Mike
cvx_20 is offline  
Old 07-28-2015, 11:47 AM
  #3  
V8 Miata Protégé
Thread Starter
 
stng_96's Avatar
 
Join Date: Feb 2015
Location: Marion Illinois
Posts: 468
Thanked 68 Times in 49 Posts
Default

You could just put turndowns on the pipe and loose no ground clearance? Also, my car has a hardtop, and will have it 95% of the time.
stng_96 is offline  
Old 07-28-2015, 12:19 PM
  #4  
V8 Miata Follower
 
crispy's Avatar
 
Join Date: Feb 2015
Location: Minneapolis
Posts: 153
Thanked 24 Times in 21 Posts
Default

I had a 3" dump before the rear axle on my car when it was a turbo'd 4cyl. It is now on my cousin's Miata as seen here.



I am planning on dumping my LS right from the engine bay.
Attached Thumbnails Dumps before axle on LS1 car?-68e9571e-505b-4621-b7c6-3a64665a03b6_zpsga1in3or.jpg  
crispy is offline  
Old 07-28-2015, 12:48 PM
  #5  
V8 Miata Protégé
Thread Starter
 
stng_96's Avatar
 
Join Date: Feb 2015
Location: Marion Illinois
Posts: 468
Thanked 68 Times in 49 Posts
Default

See I think if you can deal with the volume, that is a good option.
stng_96 is offline  
Old 07-28-2015, 04:26 PM
  #6  
V8 Miata Enthusiast
 
Join Date: Apr 2012
Location: Houston, Tx
Posts: 372
Thanked 43 Times in 28 Posts
Default

Here is my solution.


Opened, the dumps sound great. I also kept the left tip turned down so the car looks stock from the back.
Attached Thumbnails Dumps before axle on LS1 car?-spintech_zpssjlhnsjn.jpg  
Gunpilot is offline  
Old 07-28-2015, 04:44 PM
  #7  
V8 Miata Follower
 
crispy's Avatar
 
Join Date: Feb 2015
Location: Minneapolis
Posts: 153
Thanked 24 Times in 21 Posts
Default

^^^That is awesome^^^
crispy is offline  
Old 07-28-2015, 04:51 PM
  #8  
V8 Miata Protégé
Thread Starter
 
stng_96's Avatar
 
Join Date: Feb 2015
Location: Marion Illinois
Posts: 468
Thanked 68 Times in 49 Posts
Default

Thats with a Getrag though, and it still makes you have to get around the diff and cv's. Not that I don't like your setup
stng_96 is offline  
Old 07-28-2015, 05:23 PM
  #9  
V8 Miata Enthusiast
 
Join Date: Apr 2012
Location: Houston, Tx
Posts: 372
Thanked 43 Times in 28 Posts
Default

I designed it this way so that when my car hits 25 years old, I can remove cats and dump exhaust out the side of the car. Basically make my curved down dumps straight.
Gunpilot is offline  
Old 07-29-2015, 09:14 AM
  #10  
V8 Miata Protégé
Thread Starter
 
stng_96's Avatar
 
Join Date: Feb 2015
Location: Marion Illinois
Posts: 468
Thanked 68 Times in 49 Posts
Default

Yeah that is what I am considering because I don't have emissions. I wont even be running cats to begin with, I am planning on an x-pipe, and either a couple small mufflers/resonators, or one dual in dual out muffler.
stng_96 is offline  
Old 07-29-2015, 02:03 PM
  #11  
V8 Miata Participant
 
ItsAllRigged's Avatar
 
Join Date: Sep 2014
Location: Central Florida
Posts: 256
Thanked 23 Times in 17 Posts
Default

Im having this debate now as well. Id love to have a quieter car but its nearly impossible with a boss frog mounted 8.8.
ItsAllRigged is offline  
Old 07-29-2015, 02:12 PM
  #12  
V8 Miata Protégé
Thread Starter
 
stng_96's Avatar
 
Join Date: Feb 2015
Location: Marion Illinois
Posts: 468
Thanked 68 Times in 49 Posts
Default

You're ahead of me so why do you go ahead and just try it and let me know how it works!
stng_96 is offline  
Old 07-29-2015, 11:55 PM
  #13  
V8 Miata Participant
 
ItsAllRigged's Avatar
 
Join Date: Sep 2014
Location: Central Florida
Posts: 256
Thanked 23 Times in 17 Posts
Default

Ha, well I better figure somethin out!
ItsAllRigged is offline  
Old 08-01-2015, 12:01 AM
  #14  
Jim Stainer
 
charchri4's Avatar
 
Join Date: Jul 2011
Location: Sunny SW Minnesota
Posts: 2,462
Thanked 56 Times in 50 Posts
Default

I drove mine to work with just the cats on the ends of the headers and that was more than enough reliving highschool for me!

There is some practical considerations to dumping it there. That is already a place sensitive to heat and dumping exhaust near the gas tank and CV joints is putting a lot of hot air in a bad spot. If you get stuck in traffic the thing will gas you out and I think it would be difficult to find a muffler that would fit and not drone you to death. Basically you only have room for glass packs or header inserts in the tunnel.

And lastly your body is so clean and high end and has all the makings to be a thunderbolt level build. Is it really worth it to cut this corner on a couple of feet of pipe here? And considering I'm the king of road kill corner cuts...
Attached Thumbnails Dumps before axle on LS1 car?-2j29o5f.jpg  

Last edited by charchri4; 08-01-2015 at 08:35 AM.
charchri4 is offline  
Old 08-01-2015, 08:22 AM
  #15  
V8 Miata Participant
 
ItsAllRigged's Avatar
 
Join Date: Sep 2014
Location: Central Florida
Posts: 256
Thanked 23 Times in 17 Posts
Default

I agree with King of Road Kill. I sat under the car yesterday measuring and trying to find a way to run sidepipes. Just doesnt seem to be a safe/cheap/quiet way to do it within reason.

I yanked my subframe last night and its going in for surgery this weekend.
ItsAllRigged is offline  
Old 06-24-2017, 03:49 PM
  #16  
V8 Miata Noob
 
Join Date: Jun 2017
Location: Victoria BC
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Originally Posted by ItsAllRigged View Post
I agree with King of Road Kill. I sat under the car yesterday measuring and trying to find a way to run sidepipes. Just doesnt seem to be a safe/cheap/quiet way to do it within reason.

I yanked my subframe last night and its going in for surgery this weekend.
I was sort of playing around with doing an Eleanor pipe and cutting the floor just in front of the seat.....Tough going that is for sure!
If you got it done it would be loud and would drone pretty good, and dealing with the heat would be a real issue..best case.
Smokinnoob is offline  
Old 06-24-2017, 04:34 PM
  #17  
V8 Miata Protégé
 
Join Date: Nov 2014
Location: South FL
Posts: 483
Thanked 36 Times in 32 Posts
Default

I ran small resonators and turndowns off the v8r long tubes. Dumped right around where the seats where under the car. Very loud and quite obnoxious. Dirt and exhaust gases always flying up. Ears ringing after long drives. Not very enjoyable honestly.
SupaDupaSteve is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
charchri4
V8 Miata Conversion FAQs and Builder Resources
0
12-01-2014 10:44 AM
.boB
V8 Miata Drivetrains
19
05-13-2014 10:15 PM
11boy
V8 Miata Drivetrains
13
03-09-2014 05:55 PM
mrduster
V8 Miata Drivetrains
6
02-27-2013 11:09 AM
Toddcod
V8 Miata Drivetrains
26
01-08-2010 01:42 PM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 

Thread Tools
Search this Thread
Rate This Thread
Rate This Thread:
You have already rated this thread Rating: Thread Rating: 0 votes,  average.

Quick Reply: Dumps before axle on LS1 car?


Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2018 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.