comparing 2 MC's

[scott thomas]

The kh has a k26 turbo. I'm staring at two of them in my closet
right now. Both were from KH's. The kh had one knock sensor, an air
temp sensor on the manifold, the air shrouding for the injectors
came from the third port on the IC, throttle body is round. Some had
dual oil filters (mine did). Early KH's had no water cooling for the
turbos, while sometime for the 85's, they got it. The kh's were also
bolted up to autos only. The compression was 8.3-1

I would have to say the 86 car in an mc and the timing may be off.
Also, thumbing through some catalogs way back, there were
differences in production runs, as far as injectors and other little
bits go.


---- Begin Original Message ----

From: Ameer Antar <antar at comcast.net>
Sent: Tue, 26 Aug 2003 23:21:57 -0500
To: quattro at audifans.com
Subject: Re: comparing 2 MC's


Just so no misinformation ends up in the archives, the KH motor has
8.3:1 compression not 8.0. I think others have mentioned that the KH
does have a knock sensor and the later KH's have watercooled (but
smaller) turbos than MC's.

So maybe it's a KH stuck in an '86 body. One of the ways to tell MC
and KH apart is the KH comes w/ a round throttle body opening and
the air temp sensor is in the intake manifold. I think the MC
throttle body has a sort of pear shaped opening and the air temp
sensor is in the intercooler.

Another posibility might be the changes made from year to year. Even
though the specs for the KH and MC are the same for each year there
are slight differences like extra parts, different tuning settings,
etc. for each model year. I'm not positive, and I don't have my
Bentley here, but I thought there were different tuning specs for
the CIS systems in the '86 and '88 model years, even though both are
MC's. Same thing w/ the KH. There are a few parts here and there
that were added to the later KH's. I doubt this would make much
difference, but just a possibility.

-Ameer

---Original Message---

From: <auditude at cox.net>
To: quattro at audifans.com, Stephane.Livolsi at investorsgroup.com
Subject: re: comparing 2 MC's
Date: Tue, 26 Aug 2003 16:46:13 -0400

Hi Stephane,

Maybe your '86 really has a water-cooled KH.  Are you sure it has a
knock sensor and such?

If it is a KH, it would have 8.0:1 compression instead of the 7.8:1
of the MC-1, which would give it more off-boost response.  I don't
know what boost the KH's run, but if it's also less then the MC-1,
then that might explain what you are noticing.

Or not.  :P

Ken

Livolsi, Stephane Stephane.Livolsi at investorsgroup.com wrote:

<<I have a question for the tuning gurus amongst us.
For the past 5 years I have been driving an 86 5kcstq, totally stock
and
just turned over 300,000 kms.  I did a lot of maintenance work, but
no
horsepower upgrades - the car is totally stock (ok, except for the
high hp
yellow pokemon stickers)
Last month I bought a totally stock 88 5kcstq avant which has about
250,000kms.
As I understand it, these 2 cars are pretty much identical in the
engine bay
- engine size, intake, ignition, etc.
What I have noticed is that the 88 seems to have a bit less low end
grunt
and a whole lot more top end.  After about 3200 rpm it just rockets
up to
6000 very easily and smoothly.
On the other hand, the 86 seems to have a bit more pull at the lower
end,
and seems to peak out at a lower rpm - about 5000ish.
As far as I know, neither car has had any modifications from stock
that
would affect the acceleration, etc.
Does anyone know of any differences that might account for
this?  Could the
timing belt be moved over a tooth on one of them? would that account
for it?
Different turbos?
Now that I think about it a bit, the exhaust on the sedan is not
quite
stock, it is stock diameter pipe, but the rear muffler is very free
flowing.
However, I would think that this would improve top end breathing and
this is
on the car that doesn't like the top end.
This isn't a problem or concern, I just thought I'd throw it out
there and
get some opinions
Thanks
Stephane


--__--__--



---- End Original Message ----




The Official Dream Theater Site - http://www.dreamtheater.net/
___________________________________________________________
Get your own Web-based E-mail Service at http://www.zzn.com