Re[2]: 88 MB Urq questions

[awoolhouse@zetex.com]

Phil wrote

> I _know_ mine is underfueling (the top O-ring in the fuel metering head is 
> worn) but it still kicks me in the back at 100mph and runs up to an indicated 
> 130mph.  Specification is 137mph - I once saw 142mph indicated on mine in 
> Germany.

An indicated 142 is exactly what I saw on mine one night on the M5 two years ago
(never had the stupidity or willingness to lose my licence again). On reaching 
this speed which it did quite quickly up to 135+ (indicated), the ABS warning 
light started flashing which, given that I did not expect it and that in the 
heat of the moment a fault in the braking system at that speed induced some mild
panic, I backed off and never saw how fast (indicated) the car would go. I guess
Phil's experiences suggest that this is the most I could expect to see on the 
speedometer.

Still, as we all know, max speed is academic. It's how we get there that 
matters. Still haven't found another car that makes me want to get up in the 
morning like the urq does.

Oh yes. Incidentally. Got the A6 back from the dealer yesterday (fixing the 
problem with the rev counter that THEY caused as part of the 80K mile service. 
They 'claim' that it was a 'dashboard wiring fault' that just occurred by 
coincidence at the time of the service. Given the feedback I had from listers 
and the particular fault (recalibrated, not catastrophic) I suspect that this is
total B.S. Anyway. My view of dealers remains unchanged. A bunch of complete 
charlatans.

Al
85 urq
95 A6 2.6


______________________________ Reply Separator _________________________________
Subject: Re: 88 MB Urq questions
Author:  quk@isham-research.demon.co.uk (Phil Payne) at internet
Date:    18-09-98 13-03


In message <199809171549.LAA03161@urq.East.Sun.COM> Robert Houk - WorkGroup 
Server Firmware writes:
     
> This is specifically from the perspective of a U.S.-spec '83 UrQ, so I 
> don't know how much this directly translates to youse guys, but...
     
> The stock UrQ (U.S.) cam pretty much gives up the ghost around 5000RPM.
> Couple that with the stock turbo being a complete dog until around 3000RPM, 
> and you have a surprisingly-narrow useful powerband from the engine (it's
> a lot of fun in between, though).
     
This is very different.  Until the car stops accelerating, it's pulling 
very strongly.  It's not a gradual process at all - all of a sudden the 
G force disappears.  There's no misfire, stumble or fuel pump cutout. 
It's like having a slipping clutch in the accelerator cable.
     
> I should think the Euro-spec UrQ would pull well past 105MPH. Sounds like 
> maybe fuel or air starvation (do you have cat converter, or was that just 
> a U.S. thing?). A clogged/dirty air filter, or fuel filter could have the 
> same affect, as could a weak fuel pump (happened to me!).
     
I _know_ mine is underfueling (the top O-ring in the fuel metering head 
is worn) but it still kicks me in the back at 100mph and runs up to an 
indicated 130mph.  Specification is 137mph - I once saw 142mph indicated 
on mine in Germany.
     
John's car has a K&N filter, which we clean before every test session. 
The fuel flow rate is 1100ml per 30 seconds against a specification
of 900ml, and all the pressures are correct.  There are no cats on 
MBs.  His metering head is new.
     
--
 Phil Payne
 Phone: 0385 302803   Fax: 01536 723021
 (The contents of this post will _NOT_ appear in the UK Newsletter.)