Re: 5ktq brakes

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

In message <362B9D5A.2281550C@remdesign.com> Wallace White writes:

> > Orin Eman has come up with a
> > _MUCH_ better test for the WOT switch, verifying its function by
> > displaying the drive to the WGFV.
>
> And how do you do this, Orin et al.? Thanks.

Actually, I may have given Orin credit for one of Scott's innovations ...

Anyway - it's just a diode check light connected across the terminals
that drive the wastegate frequency valve.  The ECU actively modulates
this valve under 'wide open throttle' - a diode connected across the
terminals flickers as soon as WOT engages.

With experience, other things can be seen.  When the flicker dies at
high output, a shimmed or resprung wastegate can be suspected.

If you attach a pressure gauge to the line between the wastegate
frequency valve and the top chamber of the wastegate, it damn near
shakes itself to bits at WOT.

Until I saw the flickering of the diode light and the blur that had
previously been the boost gauge needle, I had no idea that such servo
mechanisms were used on Audis.

--
 Phil Payne
 Phone: 0385 302803   Fax: 01536 723021
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