2.5" or 3" for a TT

Originally Posted by Togo Well the AAM TT kit just made 500RWHP with a 3" exhaust at 6-8psi. Soooo if you had a 2.5" and you bumped up the boost

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2.5" or 3" for a TT

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12-09-2009, 08:31 PM

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Quote:

Originally Posted by Togo

Well the AAM TT kit just made 500RWHP with a 3" exhaust at 6-8psi. Soooo if you had a 2.5" and you bumped up the boost a little you might attain the 500RWHP mark then?

I'd think this would be less than ideal unless you had a built bottom end..

It wouldn't make sense to up the boost while keeping the same 2.5" exhaust diameter. Uping the boost will just create more backpressure and more heat to the engine. Plus, you get slower spool the turbo is pushing more into the engine but it's not exiting fast enough. I'm not saying that 500rwhp is not attainable with a 2.5 but at what cost? longevity maybe?

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