Re: kitty-killing results?

["Graydon D. Stuckey" <graydon@apollo.kettering.edu>]

On 4 Feb 1998, Kerry Griffith wrote:

> What kind of power increase might one expect by gutting or "test-piping"
> the cats on a 91 200q? While I'd love empirical data, please don't
> hesitate to speculate. I seem to recall a few of you who shall remain nameless
> (Graydon:-)) have BTDT with 5000tq systems. I suspect the results might not

I thought you weren't going to name names!  :-)

> be as good with the dual exhaust system on the 91, but what do I know?

That may be true - I don't know for sure.

Since the dual exhaust of the 20V car is less restrictive (I would guess 
- I haven't seen one to know if they have any weirdities) the advantage 
to an open cat would be smaller than on a 5KCSTQ.

A 3" exhaust system, from the turbo back is worth about 1.5sec in the 30 
- 70 test on my 5KCSTQ.  The EFI was another 1.5sec.

My gut (maybe that should be 'butt') feeling, (and I haven't tested this
in particular yet) is that the downpipe and the cat account for most of
the restriction in the 5KCSTQ.  There are some major restrictions in the
downpipe that didn't impress me at all.  Bob Dupree has a 3" system, but
he has a 3" high flow cat, and it is _almost_ as fast as an open 3" system
(my buttometer provided these results :-)

> This is a purely hypothetical question, as I'd never actually do
> something so environmentally unsound and above all illegal :-)

Yeah right, and you said you wouldn't name names either...  :-)

Later,
Graydon D. Stuckey
graydon@apollo.kettering.edu  <<< please note my new address!!!
810 733 0255