backpressure?
01-03-07, 11:46 PM
#1
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backpressure?
ok so ive heard from un confirmed source that rotary's dont need back pressure.. is this true and if so or if not then why. somone whos not DUMB awnser please.
01-04-07, 12:11 AM
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^^ X2
Turbos need nothing. they'll run BEST w/o any downpipe at all.
there's infinite discussion as to weather or not a naturally aspirated engine requires backpressure.
Turbos need nothing. they'll run BEST w/o any downpipe at all.
there's infinite discussion as to weather or not a naturally aspirated engine requires backpressure.
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01-04-07, 12:41 AM
#9
Former Moderator. RIP Icemark.
Despite the often posted erroneous information, the cat and back pressure have nothing to do with aux port operation on a S3 or S4 non turbo.
The aux ports work off exhaust velocity/ pressure. With the proper exhaust design you can run with no cat or air pump and they will work fine.
Back pressure is always a bad thing. The mistake is when people put bigger exhaust or mufflers on (like a 3inch dia. exhaust on a non turbo), and the aux ports stop working. It is not from reduced back pressure, but rather reduced exhaust velocity. But people think that reduced back pressure from the larger piping. They of course think wrong. The larger pipe actually slows down the speed of the exhaust leaving.
The aux ports work off exhaust velocity/ pressure. With the proper exhaust design you can run with no cat or air pump and they will work fine.
Back pressure is always a bad thing. The mistake is when people put bigger exhaust or mufflers on (like a 3inch dia. exhaust on a non turbo), and the aux ports stop working. It is not from reduced back pressure, but rather reduced exhaust velocity. But people think that reduced back pressure from the larger piping. They of course think wrong. The larger pipe actually slows down the speed of the exhaust leaving.
Is that my car starting
01-04-07, 12:47 AM
#11
Originally Posted by Icemark
Despite the often posted erroneous information, the cat and back pressure have nothing to do with aux port operation on a S3 or S4 non turbo.
The aux ports work off exhaust velocity/ pressure. With the proper exhaust design you can run with no cat or air pump and they will work fine.
Back pressure is always a bad thing. The mistake is when people put bigger exhaust or mufflers on (like a 3inch dia. exhaust on a non turbo), and the aux ports stop working. It is not from reduced back pressure, but rather reduced exhaust velocity. But people think that reduced back pressure from the larger piping. They of course think wrong. The larger pipe actually slows down the speed of the exhaust leaving.
The aux ports work off exhaust velocity/ pressure. With the proper exhaust design you can run with no cat or air pump and they will work fine.
Back pressure is always a bad thing. The mistake is when people put bigger exhaust or mufflers on (like a 3inch dia. exhaust on a non turbo), and the aux ports stop working. It is not from reduced back pressure, but rather reduced exhaust velocity. But people think that reduced back pressure from the larger piping. They of course think wrong. The larger pipe actually slows down the speed of the exhaust leaving.
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