quattro digest, Vol 1 #4191 - was more torque for an NG, now hollow cats

[Alan Pritchard]

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I agree with the environmental issues discussed, although in the uk when the
cat was introduced the 2.3 i5 10v suffered a 6 bhp loss, and on other cars,
a Vauxhall 2 litre for example ,pre cat the car produced 156 bhp, after it
went down to 150 bhp, so on a na car the cheapest way to improve power is to
remove the cat! Alternatively a high flow cat should help.
-----Original Message-----
From: Larry C Leung [mailto:l.leung at juno.com]
Sent: Monday, November 11, 2002 12:58 PM
To: quattro at audifans.com; MXHOWES at aol.com
Subject: Re: quattro digest, Vol 1 #4191 - was more torque for an NG, now
hollow cats

Sorry to get on a rant, and in reality, not trying to start
a thread but....

Go ahead, search for a more open exhaust, but please
don't consider hollowing out a Cat. Not only is it a
federal offense, but it DOES do a job helping clear
the exhaust of excess CO2, CO, HC, NOx etc. Some certainly
will claim that their exhaust is clean enough (i.e. passes
sniff tests) without, but usually only the best maintained
older cars do that. The cat helps make up for cars that
have:

Vac and metering leaks
Ignition controller issues
fuel mixture issues

Gee, all things that are mentioned on this list.

The effect on performance of a properly sized cat
is minimal (i.e. if you think the car's performance
improved without, it was probably was plugged,
or you fixed something else in your quest for
more improvement), etc. Of course this applies
to a street car, a car only used at the track and TUNED
to need the extra flow may see an advantage, but most
street driven cars can hardly note a significant advantage.

If you suspect that the exhaust is part of the performance
problem, suspect the cat may be clogged or the exhaust
was replaced by an improper one from the P.O. Cats
are availible from places like DiscountConverter.com
etc.

Please consider all of our responsibilities for our environment,
without going into a whole story, at the least, excess CO2 is
a very likely cause for the crappy weather changes that we are
all going through. The environment is something we all have
to live with....


LL - NY



> To: quattro at audifans.com
> Date: Sun, 10 Nov 2002 22:50:47 -0700
> Subject: Re: (I want) more torque from a NG motor
> From: edkellock at juno.com
>
> Assuming all tune-up items are in good shape already...
>
> I think the easiest way to get more torque is to open up the exhaust
> so
> it scavenges better.  On my CGT/NG, I have a hollow kitty and a
> free
> flowing 2.5-inch system back from there.  It draws very well and
> sounds
> great too.  I've previously gained low-end torque on a GTI in the
> same
> manner.
>
> Another thing that can really affect the  feeling of torque is
> wheel/tire
> weight.  If you have aftermarket wheels and/or larger wheels tires,
> you
> may be sapping some power with extra weight.
>
> I had two non-NG CGT's prior to this one and my first impression
> was
> similar to yours.  I've driven a couple of 4kq's since and still
> enjoy
> the NG more... well mine anyway.  ;-)
>
> One torque-trick on the JT is to advance the ignition timing.
> Unfortunately on the NG that is not possible.  Where there is
> usually a
> bolt, there is a permanent plug hammered in to prevent adjustment.
> Some
> have written about circumventing that however.  I have no further
> information on that.
>
> Ed
> Colorado Springs
>
> On Sun, 10 Nov 2002 19:55:03 EST MXHOWES at aol.com writes:
> > ?85 4kq (JT engine, 2.2L 115hp) vrs. ?88 80q (NG engine 2.3L
> > 130hp)