83 Ur Q

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

In message <192970@isham-research.demon.co.uk> quk@isham-research.demon.co.uk (Phil Payne) writes:

> The official test for the WR turbo is to run the car in second gear, foot hard 
> down, to 5500rpm and hold it there using the brakes.  Maximum ten seconds!
> 
> Using a spreadsheet, you can recreate the graph in the factory documentation - 
> two straight lines giving the lower limit and upper limit.
>  
> The lower limit stretches from 0.67 bar at +20c to 0.83 bar at -20c.  The upper 
> limit is from 0.69 bar at +20c to 0.85 bar at -20c.  WRs go a _lot_ better in 
> cold weather!

What I forgot to say is - don't under _any_ circumstances rely on the on-board 
boost gauge.  Two reasons - one is that someone might have messed around with 
its input in the process of fooling the ECU, and the second is that the factory 
documentation is _thoroughly_ dismissive of its accuracy.  In one place, Audi's 
manuals actually refer to it as "eine Attrappe".  Attach a proper boost gauge 
by T-ing into one of the two lines coming off the top of the inlet manifold, 
and lead the hose through one of the bonnet louvres and into the car through a 
window.  I use a 6" dial instrument.  While you're at it, check the integrity 
of those lines where they join the manifold.
 
Also - is the upper chamber of your wastegate still open to air, or is there a 
hose attached and, if so, where does it go?   

-- 
 Phil Payne
 Committee Member, UK Audi [ur-]quattro Owners Club