996 Turbo / GT2 Turbo discussion on previous model 2000-2005 Porsche 911 Twin Turbo and 911 GT2.

Back pressure question

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Old Sep 1, 2005 | 10:24 AM
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Back pressure question

If you have an exhaust with no mufflers like I do, is it making enough backpressure or am I losing power?

Not sure because I had a debate with a guy last night and he said with the Muffler by pass system I have the car wont make enough back pressure

Is this guy a wing nut?

PHD? anyone?
 
Old Sep 1, 2005 | 12:41 PM
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Turbocharged engines do not need backpressure, N/A engines do need backpressure.

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Old Sep 1, 2005 | 04:33 PM
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Actually, no cars need back pressure. The reason some N/A cars lose power due to less backpressure is because they are not TUNED to benefit from the reduced backpressure. When you reduce backpressure significantly, cam timing and ignition timing has to be adjusted to benefit from the decreased backpressure.

With less backpressure, your Turbo's will spool faster and you should be able to sustain a higher level of boost.

- KJ
 
Old Sep 2, 2005 | 10:02 AM
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Thanks guys..My Tuner did not make any adjustments as far as I know to anything other than software. Is that enough?
 
Old Sep 2, 2005 | 11:55 AM
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Originally posted by SPANKY
Thanks guys..My Tuner did not make any adjustments as far as I know to anything other than software. Is that enough?
I think you should be fine. You may not be making optimal power when you bypass the Muffler's, but you'll still be making more than with the mufflers NOT bypassed.

BTW, nice to see another Toronto TT on the board!

- KJ
 
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