Turbo back exhaust?

[03cavyTT]

What are the performance gains from a turbo back exhaust. My friend says it will give him +23whp and +26wtq Idont think this is true can someone please help.

THANKS

[-The Stig-]

Originally Posted by 03cavyTT

What are the performance gains from a turbo back exhaust. My friend says it will give him +23whp and +26wtq Idont think this is true can someone please help.

THANKS

Hello McFly, Anybody in there!? j/k



Yeah, we can't help you unless you tell us what car you're talking about with the turbo system.

[03cavyTT]

Sorry its a stock 04 STi

[-The Stig-]

From what I understand the STi's respond well to modding. Doesn't sound impossible it'd gain 20hp and 20tq from an exhaust upgrade.


I've heard of STi's gaining nearly 15-20hp just by running a bit of race gas. Apparently the STi's ECU doesn't like US gasoline, so it dampers the performance... but if you add some race gas to up the octane it senses the change and puts out more power. It might only be for California spec STi's cause we have crappy gas though, else were in the country you can get 93 octane from the pump just about any where.


EDIT: I just noticed you said he'd gain wheel horsepower, not sure about that much of a gain. But maybe crankhorsower... which equate to about... 5-10hp more if he's lucky at the wheels. I'm no expert on the STi, i'm only guessing. I'm sure somebody around here knows.

[03cavyTT]

Sorry Biff that i forgot to post the car lol i was in a rush

[RACER D12]

Just played quest for the crown Redneck BEST GAME EVER!

[turbo2nr]

yea like redneck said its not impossible i hear of supras makin 30+hp with a turbo back exhaust and even dsm making at least 15hp with a turbo back exhaust ..
1

[fatninja19]

Originally Posted by turbo2nr

yea like redneck said its not impossible i hear of supras makin 30+hp with a turbo back exhaust and even dsm making at least 15hp with a turbo back exhaust ..
1

at least.

[03cavyTT]

yeah in crank HP not wheel HP. How would a turbo bakc give you 23hp at the wheels

[turbo2nr]

by freeing up back presssure in your exhaust and letting the turbo flow better which allows more air to exit faster and in turn more air will enter faster.
1

[mynismo]

here's a good write-up about exhaust systems

http://www.magnaflow.com/05news/magazine/05sportc.htm

my exhausts system is going on in about 12 hours.

[fatninja19]

Originally Posted by 03cavyTT

yeah in crank HP not wheel HP. How would a turbo bakc give you 23hp at the wheels

Idunno about STI's.. but you'd be surprised how much of a hp gain you get with just a aftermarket downpipe on a mkIV supra Turbo..

[nissanfanatic]

you would probably gain more than usual because of the turbo. It also depends on what exhaust (pipe diameter) and what sound suppression type you have. 3" would probably be the way to go in your application. combo with CAI would be very noticable.

[Polygon]

If he gets a full 3" mandrel bent exhaust, from the turbo all the way back, he can very well expect those kinds of gains. For even more fun he should remove the cat and put in a test pipe.