Re: [DML] Cat removal
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [DML] Cat removal



Martin,

As you well know, there are other differences in the USA/EUR DeLoreans 
than just the cat.  I'm not versed in these differences, but I know that 
it's seldom a simple matter to alter a single variable within a complex 
system.

Removing the cat on US vehicles may or may not increase performance, and I 
would like to see a dyno test that shows the difference.  Removing the cat 
will almost certainly increase emissions.  If I could get another 10 or 20 
HP by cutting out the cat, I'd be under there with a hacksaw right now. 
But in truth I think it's 1 or 2 HP, which hardly seems worth the effort 
(let alone the extra emissions).

Don't worry about the higher emissions in your Euro-spec cars...you'd need 
to leave every vehicle in Europe idling 24/7 before you'd even come close 
to catching up with the USA.  We're #1, woo hoo!

Gus Schlachter
VIN #4695
Austin, Texas



dmcnews@xxxxxxxxxxxxxxx wrote on 09/23/2005 07:39:12 PM:

> 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.
> > 
> >
> 
> 
> 
> 
> 
> 
> To address comments privately to the moderating team, please address:
> moderators@xxxxxxxxxxx
> 
> For more info on the list, tech articles, cars for sale see 
www.dmcnews.com
> 
> To search the archives or view files, log in at http://groups.yahoo.
> com/group/dmcnews 
> Yahoo! Groups Links
> 
> 
> 
> 
> 
> 


[Non-text portions of this message have been removed]





To address comments privately to the moderating team, please address:
moderators@xxxxxxxxxxx

For more info on the list, tech articles, cars for sale see www.dmcnews.com

To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews 
Yahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/dmcnews/

<*> To unsubscribe from this group, send an email to:
    dmcnews-unsubscribe@xxxxxxxxxxxxxxx

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/
 




Home Back to the Home of PROJECT VIXEN


Copyright 2006 ProjectVixen.com.  All rights reserved.

Opinions expressed in posts reflect the views of their respective authors.
DMCForum Mailing List Archive  DMCNews Mailing List Archive  DMC-UK Mailing List Archive