Re: [DML] Exhaust Question: DMCH vs. DMUK.

[Martin Gutkowski <webmaster@xxxx>]

Hi All

One VERY important point: The stainless system we have on our website is 
not one we sell - we simply pass on the information on where to buy it 
which is www.stainless-exhaust.com - it would be a bit crafty to re-sell 
it since the original "investment" was made by DeLorean Owners Club 
secretary, Chris Parnham to the gain of the DOC in general, of which I'm 
a proud member and was webmaster for several years before starting DMUK. 
The system is, however, a prerequesite to most of our performance 
upgrades. And before I get another 20 or so off-list mails about them, 
we approach the fuel system differently in that we get rid of the lambda 
system which immediately rules out our upgrades for the US as it sends 
the emissions too high to be able to use cats.

As to performance: The stainless sytem available here provides a lot 
more torque, and a modest high-end gain, with approriate tweaking of the 
fuelling (richening it up to beyond the band controlled by the lambda 
system). I have heard that the DMCH system is a better overall exhaust - 
and given the headers, I can believe that, but doubt it has more than a 
couple of hp gain over the stainless system - this is the opinion of Don 
at Stainless Exhaust.

Club member, Robin Simpson wrote of his new system, fitted last week 
(removing completely stock system including cat):

Got my D back yesterday after, among other things, having the 
stainless exhaust from Don Pemberton fitted along with new manifold 
gaskets - what a transformation !

Not only does it now sound like it should, it breathes much better 
and is much more flexible throughout the rev-range - it's like having 
a new car !! Having not had her at home for a week, it was quite like 
going to collect her for the first time - god I love my 'D' !

There are basically 3 "tones" available for the stainless system: Quiet 
sounds like an original exhaust. Medium has a nice bass note at idle but 
screams at high revs in a way that I can only describe as "more 
european". Standing still and revving it sounds like a very loud 
chainsaw to my ears and when I first heard it, I was slightly put 
off.... until I heard Chris Parnham doing a "drive-by" whilst 
accellerating to the red line. In that, it sounds fantastic. The Loud 
system is the closest you'll get the DeLorean engine to sound like the 
BTTF effects sounds, but it's LOUD, in fact the club member who fitted 
it claimed the engine was quieter without the back box!

I have driven one of DMCH's 197hp 5-speeds. I have also modified my own 
engine in #1458 with a metering head, CPR and, most importantly, 
ignition distributor from a Volvo B28E engine, which "out of the box" 
had no cats and no lambda system, and is meant to be tuned to 1.5% CO 
with an output of 170hp. I have a cat bypass pipe, but everything else 
is stock. My first impression of the DMCH car was that it lacked torque 
- I can happily hold the revs up on my car, allowing the clutch to slip 
and get me "off the line" in a tyre-sqealing launch followed by a 
gloriously constant torque curve that see the revs rising rapidly from 
2000rpm to the red line, whereupon I feel as if it would just keep 
going, so change up. This works all the way through the gears, but I 
haven't had the bottle to take it as far as it'll go in 5th. The DMCH 
car by comparison, was difficult to launch off the line at the Houston 
raceway, but once the revs built up, definitely gave that "gravity 
moving from my arse to me back" feeling that my car doesn't. I look 
forward to putting a stainless system (no cats of course) on my own car, 
but at the moment we've got too many customers cars in for me to have 
the time to work on my own! However, one of these cars is getting a 
stainless exhaust as well as the 170hp upgrade. I'm looking forward to 
taking it down the road. It has its steering wheel on the wrong side too...

Martin
DeLorean Motors UK
www.delorean.co.uk

therealdmcvegas wrote:

> Straight to the point, which exhaust system is better in terms of 
> performance?
>
> DMCH: http://www.delorean.com/exhaust.asp
> or
> DMUK: http://www.delorean.co.uk/DMUK/perfomance.html