Subject	Right on. Need for backpressure is a myth.
Posted by	mm_95TT on September 13, 2003 at 1:31 PM
	This message has been viewed 40 times.
In Reply To	I never liked the term back pressure, exhaust gas velocity. posted by ScubaSteve on September 13, 2003 at 09:42 AM
Message	Backpressure is to be avoided...ALWAYS. No exceptions. The reason a smaller exhaust is better in this case is that it keeps the gasses moving faster, and the higher inertia of the faster moving gasses means you are "pulling" more air through the engine. This means that in-between explosions (when the exhaust valves are open, and especially during the intake-exhaust overlap), the inertia of this fast-moving exhaust gas (or the low pressure zone created in its wake, if you prefer) is what pulls fresh air into the cylinder! Of course, forced induction helps as well!
Follow Ups	exhaust question (custom made) for a N/a - turbo1 01:30:47 09/13/03 here is a custom made one for TT, with sound :o) - northZ 02:10:06 09/13/03 Having one made for mine as we speak. - TritonZ 06:43:59 09/13/03 3" is too big and your really hurting your car by doing that - TTwinZ (CT) 09:17:12 09/13/03 I never liked the term back pressure, exhaust gas velocity. - ScubaSteve 09:42:14 09/13/03 Thanks i didn't really know all the technical stuff... - TTwinZ (CT) 10:49:54 09/13/03 Right on. Need for backpressure is a myth. - mm_95TT 13:31:09 09/13/03 My thoughts :) - ZBlacktt 13:43:12 09/13/03 You cannot separate HP and torque - PEwithaZ 15:12:29 09/13/03 No, No, No. - PEwithaZ 15:21:20 09/13/03 it's a combination of velocity and volume. - JC_NS 17:39:20 09/13/03 sounds real good as long as you go with good - NR98 (next year) 09:55:56 09/13/03
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