[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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
> >>
> >> _____________________________________________________________
> >> Sign up for FREE email yourname@veedub.com
> >> from http://www.veedub.com
> >>
> >> _____________________________________________________________
> >> Select your own custom email address for FREE! Get you@yourchoice.com 
> w/No Ads, 6MB, POP & more! http://www.everyone.net/selectmail?campaign=tag
> >>
> >> _______________________________________________
> >> Scirocco-l mailing list
> >> Scirocco-l@scirocco.org
> >> http://neubayern.net/mailman/listinfo/scirocco-l
> >>
> >
> >
> >_______________________________________________
> >Scirocco-l mailing list
> >Scirocco-l@scirocco.org
> >http://neubayern.net/mailman/listinfo/scirocco-l
>
>_____________________________________________________________
>Sign up for FREE email yourname@veedub.com
>from http://www.veedub.com
>
>_____________________________________________________________
>Select your own custom email address for FREE! Get you@yourchoice.com w/No 
>Ads, 6MB, POP & more! http://www.everyone.net/selectmail?campaign=tag
>
>_______________________________________________
>Scirocco-l mailing list
>Scirocco-l@scirocco.org
>http://neubayern.net/mailman/listinfo/scirocco-l