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shon -> RE: UrS4 exhaust (8/9/2004 10:09:18 PM)
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a good exhaust has the perfect balance between 2 things.
while im new to the turbo scene, i dont see why it would be any different:
the 2 variables you have to balance are 1)backpressure and 2)exhaust gas velocity.
basically what ive gathered, is you want ZERO backpressure...
i understand you guys think you need some backpressure to keep low end tq, but thats not the case.
what you do when you do a huge exhaust (>3") is you eliminate alot of backpressure (good) but you lose almost all of your exhaust gas velocity, basically your exhaust gasses are spinning around inside the pipe (almost as if there were turbulance) causing more restriction than your dinky stock pipes. this is where you lose your low end torque, not from the "missing" backpressure.
what you look for in an exhaust is 1) the lowest amount of restriction (backpressure) while raising your exhaust gas velocity.
i hate to contradict what Imolas4 said, but this is what ive learned from my reading throughout the years.
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