Re: 5kCSTQ boost Q

[quk@sievers.com (Phil Payne)]

In message <199608260418.VAA28810@netcom2.netcom.com> orin@netcom.com (Orin Eman) writes:

> I though a little more about it - I was only doing about 2500 rpm...
> so I guess the turbo might be a bit slow to spool up.

Yes.  I don't know what gear and speed are recommended for the 5000 boost test, 
but for the ur-quattro MB it's third gear and accelerate from 55kph to 80kph - 
measure at 80kph.
 
> I also though I might have run into the fuel pump shutoff, but the effect
> seemed too soft - just a noticeable reduction in acceleration.

Yes.  Hit _that_, and you almost go through the windscreen.

> I did check the intercooler output and turbo inlet.  Nothing but normal
> intake system crud.  There wasn't any end play in the turbo and it turned
> easily enough.

Good.

> It's also interesting to note that my (built in digital) boost guage
> reads .1bar low consistently.  I'm wondering if the sensor is reading low
> allowing the 8psi boost, a little high for stock.  I had thought it was the
> digital readout which was wrong...

The service documentation is very dismissive of the built in gauge.  

--
 Phil Payne
 phil@sievers.com
 Committee Member, UK Audi [ur-]quattro Owners Club