RE: Performance difference w/o a cat?

[Chris Coracini <Coracin@usdl.com>]

simply removing a cat will NOT give you 10hp.  the difference between
the 129hp and 139hp has to do with more than just the cat.  they also
used K-jet instead of KE-jet, vacuum advance ignition, etc.  they
probably removed it to allow a richer mixture that may overheat a cat,
or maybe to allow the use of leaded gas which would allow more ignition
advance.  THAT i can see adding 10hp up top.  but JUST swapping out a
cat/downpipe with a catless downpipe will not net 10hp.  no way, no how.

chris
86 16V scirocco
>----------
>From: 	Roland Johansson[SMTP:scirocco@mail.bip.net]
>Sent: 	Tuesday, January 26, 1999 12:12 PM
>To: 	'Scirocco List'
>Subject: 	SV: Performance difference w/o a cat?
>
>Not so many days a discussion what differed the eurpoean version
>from the US version. We got to versions here, early cars with no
>cat and 139hp and later versions with cat and only 129hp. So
>10hp difference with a cat vs no cat setup on US cars don't seem
>so strange.
>
>But if you compare a car with a free flowing race cat or no cat
>it might not be any big difference.
>
>Roland Johansson
>Scirocco 1,6l TIC -82
>Http://hem.passagen.se/toker
>
>
>> 	One of the magazines I just got (don't remember which one)
>was
>> working on a project car.  They were doing an exhaust thing
>and found their
>> car had a hollowed out cat.  They put a new cat on, and the
>car made more
>> power with the cat than without.  
>> 
>> > >
>> > >I agree.   Precious exhaust gas velocity is severly
>hindered when the
>> > >downpipe opens
>> > >up into the cat, then must be re-funneled into the rest of
>the system.
>> > Not
>> > >exactly a
>> > >device designed with performance in mind, although it is a
>highly
>> > efficient
>> > >unit, as
>> > >far as cats go.  Going with a catless downpipe like the new
>TT offer
>> > greater
>> > >torque,
>> > >throttle response, and hp (I think TT claims 11 peak).
>> > 
>> > hold on, 11hp?!?!  hmmmm...  i seriously doubt that, VERY
>seriously.
>> > maybe comparing the single outlet manifold/downpipe w/cat to
>a dual
>> > outlet manifold/dual long downpipe, then MAYbe it would be
>close to
>> > 11hp.  but not comparing the 16V dual downpipe with or
>without a cat, no
>> > way...
>> > 
>> > chris
>> > 86 16V scirocco
>
>
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