Re: 88 MB Urq questions

[quk@isham-research.demon.co.uk (Phil Payne)]

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
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