Re: [DML] Cat removal

[Martin Gutkowski <martin@xxxxxxxxxxxxxx>]

Hi Stephen

You may like to actually try driving a DeLorean that has been de catted 
- and by this I do not mean simply gutting the contents of the existing 
cat*. The exhaust note changes noticably and the engine is without 
question perkier. I have no dyno sheets to prove this, but if you can 
find one owner who has a cat bypass pipe installed and did not 
experience greater performance, I'll eat a cat for tomorrow's breakfast 
:-) Meoww

Remember the DeLorean engine is unusual for a PRV in that it is catted - 
for 1981 this was very rare. ALL the european versions run considerably 
more horsepower and this all comes down to the fuel system not requiring 
a lambda system to keep a perfect  mixture. Running rich can be good for 
performance if tuned properly. Our euro converted engines are 
considerably more powerful, still running a stock exhaust, cat bypass 
and european B28E ignition and injection systems. One customer 
discovered his clutch was worn out immediately after collecting his car 
after the upgrade.

* I have one customer to whose car I fitted a cat bypass pipe. His old 
cat had a perfect hole strait down the middle. Despite this, he still 
reported improved pickup and crucially a marked increase in fuel economy.

By suggesting the DeLorean's stock exhaust is "tuned" is rather amusing 
really :-)

FYI catalytic converters were not mandatory in the UK till 1994 so we 
can legally remove them over here, and sell the pipe to do so. Are we 
being environmentally unfriendly? I suppose so, but we are burning less 
fuel doing it, so you could argue we're actually cutting down on CO2 
emissions!

Martin

Stephen Schlachter wrote:

>See my previous posts about removing the cat.  Doing so increases 
>emissions, and adds no performance (and may even hinder it).  Just 
>because you can't see the extra pollution doesn't mean it isn't there, 
>and backpressure is part of the overall exhaust tuning.
>
>The only reason to remove the cat is due to malfunction...and then, 
>only to replace it.  If someone has a dyno test that demonstrates a 
>measureable improvement in performance by increasing pollutants, I'd 
>like to see it.
>  
>






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