I will be doin a stage 2 turbo on my 03 ecotec and a custom exhaust what size exhaust would you use 2.25? 2.5? or 3? or should i go a magnaflow exhaust or something like that? Give me your opinion on both please thanks!
You should get something no smaller than 2.5", but it all depends on what power you'll be pushing. Many of the members here are running one or the other so its your call as to how much air you'll be moving. I'll leave it up to the turbo guys to chime in on this one.
Blown.
like filip said, no smaller than 2.5" but preferably 3". i have a full 3" exhaust from the turbo back on my turbo ld9. bigger is better on a turbo car.
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450WHP Turbo Ecotec swap in the works...
I'm going to be using 2 1/2" which should be plenty good
www.kronosperformance.com / 732-742-8837
With boost...
Back pressure is the devil...
Protonus wrote:The bigger the better.
Not always true, and a larger exhaust will not always create less backpressure.
You're interested in flowing air, heat has a lot to do with this. If you increase the exhasut size beyond what is needed you can actually hurt the flow vs help it.
I'll be using 2.5 for my setup.
12.770 @ 111.99 Intercooled Eaton M62
Airtonics wrote:Protonus wrote:The bigger the better.
Not always true, and a larger exhaust will not always create less backpressure.
You're interested in flowing air, heat has a lot to do with this. If you increase the exhasut size beyond what is needed you can actually hurt the flow vs help it.
I'll be using 2.5 for my setup.
Not true on a turbo car if you're running a full exhaust. I can guarantee you'd see gains AND faster spool (which is a gain in and of itself ) with 3" over 2.5".
If you have a partial exhaust (IE less restriction due to length) then yes you could go too big. My exhaust when my cut out is open is about 32" long, so, I went with 3". Any larger on such a short exahust with only 1 bend and it could reduce the life of the turbo. But no performance is lost with the larger exhaust
Heat DOES have a lot to do with it, but there are TWO different ways it affects the turbo. A COLD exhaust will promote spool due to a higher temperature differential but a hotter exhaust will promote flow and keep the velocity up. Of the two it's normaly better to insulate the exhaust. header wrap is the best way especially for that first few feet after the turbo.
Just some food for thought.
s/c- 2.5" w/ hi-flo cat..
turbo- 3" straight bltch
-marc
boosted again...hehe
Protonus wrote:The bigger the better.
Agreed. On a turbo motor, the bigger, shorter and less bends the better. No exhaust at all would yeild the highest hp #'s across the entire rpm range.
- 93 mph in the 1/8 mile
Member of J-Body Of Michigan.
This is kinda off topic but when I was at the track this past summer I saw a Supra with a 5 inch exhaust downpipe!!!!!!!
http://www.cardomain.com/ride/2090440
The faster you can get air out, the faster you can get air in. The faster you get air in and out, the faster your turbo is spools.
Nitrous Nate wrote:This is kinda off topic but when I was at the track this past summer I saw a Supra with a 5 inch exhaust downpipe!!!!!!!
that's pretty massive. was it a 9 second car?
I was a retard, and now I'm permanently banned.
i think it was running low 8s... it was some big name companys
http://www.cardomain.com/ride/2090440
i have no idea im pretty sure the car was blue if that helps... it also had N2O... I talked to the guy about the car for a bit and i was like so how much boost are you pushin with it and he was like ah not much only 48lbs... hahaha ONLY
http://www.cardomain.com/ride/2090440
sorry to thread jack but i want to do a 3" with a side exit. i want to run a high flow cat and mabye high flow res with a camaro flat tip will this hurt my perfomance?
