Exhaust - power

Q&A regarding engines, turbos, and intercoolers and power upgrades

Re: Exhaust - power

Postby underscore » Wed Nov 11, 2015 4:49 pm

It should rise to ~10psi in 3/4/5 gear so it sounds like your TVSV is disconnected or broken. If you have a 3" downpipe and a 3" axleback I'd get a 3" midpipe made to keep the flow smooth and have an extra resonator or muffler put in it as needed to keep the sound where you want it.
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Re: Exhaust - power

Postby Rallly » Wed Nov 11, 2015 5:25 pm

underscore wrote:It should rise to ~10psi in 3/4/5 gear so it sounds like your TVSV is disconnected or broken. If you have a 3" downpipe and a 3" axleback I'd get a 3" midpipe made to keep the flow smooth and have an extra resonator or muffler put in it as needed to keep the sound where you want it.



How do I check my tvsv? I've checked everything else with no luck.
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Re: Exhaust - power

Postby Rallly » Wed Nov 18, 2015 3:39 pm

underscore wrote:It should rise to ~10psi in 3/4/5 gear so it sounds like your TVSV is disconnected or broken. If you have a 3" downpipe and a 3" axleback I'd get a 3" midpipe made to keep the flow smooth and have an extra resonator or muffler put in it as needed to keep the sound where you want it.


Wouldn't a resonator or extra muffler "bottle neck" my exhaust, preventing better turbo performance?
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Re: Exhaust - power

Postby underscore » Tue Nov 24, 2015 3:01 am

Not really, since 3" is already a little larger than the car needs. Regardless you have to make the compromise one way or the other, for completely undisturbed flow you're going to have a very loud (and usually illegal) car, for a reasonable volume you have to add mufflers and resonators but the loss of power (if any) is so minor you won't be able to tell.
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Re: Exhaust - power

Postby Rallly » Tue Nov 24, 2015 10:59 am

So with a 3 inch exhaust system front to back, what size resonator should I place in the system?
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Re: Exhaust - power

Postby underscore » Tue Nov 24, 2015 3:21 pm

Anything that fits and has a 3" inlet/outlet would work.
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Re: Exhaust - power

Postby Rallly » Tue Nov 24, 2015 5:56 pm

Cool :) I'm just hoping it won't be obnoxiously loud..
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Re: Exhaust - power

Postby Rallly » Mon Feb 15, 2016 12:07 am

Hey guys, I ended up going 2.5 exhaust straight to the back, dp, mp, and boost seems to want to surpass 13-14 and beyond. I will be installing a fcd shortly cuz I am very easily hitting cut but I worry that I will still be overboosting past my turbo threshold of 14psi after the fcd... What should I do so I don't go passed 14? Is this even normal after exhaust work?
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