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bit of confusion on exhausts
TT supplies mufflers with 2.25" inlet and 2.25" outlet. You can order a
single or dual tip but that is for appearances only... it's still 2.25" out
of the muffler.
-RGK-
At 11:40 AM 11/26/02 -0800, Dan Smith wrote:
>Well, that makes sense. For more info, the TT exhaust is 2.25", the
>muffler is 2.5" inlet, dual 3" outlets. (God I hope it doesn't sound like
>a fartcan) It seems velocity would be the same as in a stock setup, as the
>sizes aren't changing, just the restrictions, or lack of. Am I correct?
>And do others agree that backpressure is a myth?
>
>Dan
>
>--- Ryan H <rhock99@epix.net> wrote:
> >I can't answer your question about your exhaust, but I can offer my
> knowledge on back pressure...
> >This is a big myth... from what I have read, you don't want ANY
> backpressure, you want exhaust gas velocity. The reason people think you
> need backpressure is simple: If your engine only generates 250 cfm of
> exhaust gases, and you have a 3.5" exhaust, the exhaust has so much room
> when it makes it to your 3.5 inch pipe, that it has no need to move
> further down the pipe, and it creates a sort of wall. This causes
> exhaust gas velocities to slow, and interferes with the ability of the
> exhaust system to "scavenge" exhaust gases from the engine when the
> exhaust valves are open. This means the engine has to force exhaust
> gases out the valves, instead of it being sucked out by the exhaust
> system, and this is where systems with "too little backpressure" (in
> truth, exhaust gas velocity) lose their power.
> >I guess it would take some experimentation on your part to see what
> allows your car the maximum exhaust flow rate.
> >
> >>
> >> From: Dan Smith <sad_rocc@veedub.com>
> >> Date: 2002/11/26 Tue PM 01:59:12 EST
> >> To: scirocco-l@scirocco.org
> >> Subject: bit of confusion on exhausts
> >>
> >> I have a stock 1.8l 16v, which hopefully at some point will change.
> I've been looking into an aluminized TT setup with no resonator and
> swapping the muffler for a fireball dual tip straight-thru design. I've
> heard though that you want some backpressure and if your exhaust is too
> free flowing, then you actually lose power. What exactly is the real deal
> on this? And would this setup be too free flowing? Suggestions, comments, ect.
> >>
> >> Dan
> >>
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