Re: 2.0" or 2.25" exhaust?

[Jim Buck <vwpride@mixi.net>]

I would say with the mods you've described, a bigger exhaust would be a source
of significant gain at top end with little if any torque loss at low rpm.  Go
for it.  A resonated tip might help the raspberries if you go without a mid
resonator, although it would probably be louder in the car itself.

jim

"Scott F. Williams" wrote:

> Gentleman, I've got an exhaust tuning question for yuz. My rally car
> runs an Audi 2.0 8V motor with ported head and intake runners, g-cam,
> and big throttle body. In otherwords the car inhales very nicely. The
> head is shaved down a little so that the compression ratio is about
> 10.5:1.
>
> The exhaust manifold is an iron 4/2 from an old Scirocco and the
> downpipe is 2/1 -making for a nice-sturdy tri-y situation. The cat was
> ditched a long time ago and a center resonator (glass pack muffler) with
> "test" pipe are there in it's place. Now, as nice as this is, the cat
> back exhaust is still the old mandrel-bent 2.0" from my deceased 1.8l
> Rabbit GTi.
>
> It definitely worked great back then as it was ideally matched for flow.
> However, with my increased displacement, I now figure that I might be
> strangling the car a little bit. I could definitely get rid of the
> resonator. Would this give me somewhere near the equivalent flow of an
> uncorked 2.25" auspuff system? How about if I kept the resonator and
> lost the rear muffler? This'd probably be way too loud, though...
> --
> Scott F. Williams
> NJ Scirocco nut
> Hotrod Rabbit GTI
> SCCA ProRally driver
>
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--
Jim Buck
1990 Passat Wagon 2.0 16v
1987 Scirocco 16v "lil 109"
1982 Rabbit Convertible **FOR SALE** http://www.mixi.net/~vwpride/cabbie.htm

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