[BiturboS4] RE: Hesitation....and now...Catbacks

jy jysap at cs.com
Fri Oct 25 23:38:12 EDT 2002


I agree - even the catbacks on the Porsches do not produce more than single
or low dbl digit hp nbrs. Anyone expecting 30 hp/30 lbs of torque gains has
been breathing to many S4 exhaust fumes. The real HP/Torque gains in any
turbo car are achieved thru the replacement of the stock chip.


Y2K S4
86 951

----- Original Message -----
From: "Edwards, Dave" <Dave_Edwards at iOra.com>
To: <jysap at cs.com>; <biturbos4 at audifans.com>
Sent: Friday, October 25, 2002 4:00 AM
Subject: RE: [BiturboS4] RE: Hesitation....and now...Catbacks

> Well thank you for such confidence in my posts. I admit I do have a
> to write BS on some subjects :-) but never on technical issues.
> Yes I do have dyno plots of the various stages of modification of my car.
> However my assertion is not based on these (my first mod was chip and
> cat-back at the same time), but on what my tuner has done. They have
> Miltek cat-backs to all the Audi turbo cars and have the dyno results. In
> general the amount of extra hp and torque they have seen from cat-back
> is in single figures.
> You can expect a further 30hp/30lbft from the Miltek cats, but the chip
> really need to increase the fuelling slightly to get this. Again this is
> based on a before and after dyno.
> Maybe there's something about the US cars that gives more performance gain
> from the cat-back only. If so I look forward to reading about those dyno
> readings.
> Dave
> -----Original Message-----
> From: jysap at cs.com [mailto:jysap at cs.com]
> Sent: 25 October 2002 02:14
> To: Dave_Edwards at iOra.com; biturbos4 at audifans.com
> Subject: RE: [BiturboS4] RE: Hesitation....and now...Catbacks
> Dave,
> Can u expand on your point:
> >This should not be much of
> >a problem with the cat-back (which IMO just changes the noise, not much
> >else)
> Have u done a dyno of an S4 with a stock exhaust vs. catback vs. no-cat
> exhaust (under the same conditions)to get a basis for your statement?
> Without making such a comparison, I couldn't see how u could render such
> opinion. Maybe you (or someone else) has and could pass such info to the
> list, as a public service announcement.
> jy
> Y2K S4
> 86 951
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