[urq] RE : RE : What causes knock ?

Brandon Rogers brogers at terrix.com
Fri May 12 16:11:52 EDT 2006


I would think if you plugged the Mighty Vac into the vent to atmo on the WG 
cap - if it holds vacuum then your diaphragm should be fine...

Brandon
----- Original Message ----- 
From: "Louis-Alain Richard" <laraa at sympatico.ca>
To: "'Buchholz, Steven'" <Steven.Buchholz at kla-tencor.com>; 
<urq at audifans.com>
Sent: Friday, May 12, 2006 12:37 PM
Subject: [urq] RE : RE : What causes knock ?


Yeah, you're right: the wastegate spring (+ boost pressure) is the only
thing that controls actual boost. I checked it a while ago, but it may
have failed now. IS it possible to test it with a MightyVac ? IIRC, I
wasn't able to...

LAR


> -----Message d'origine-----

> ... if your car is stock you should not see readings this high ... and
> that very well could be contributing to the knock.  The ECU would
normally
> have shut off the fuel pump at this boost level.  Do you know if your
WG
> diaphragm is cracked?
>
> Steve B
> San José, CA (USA)
> >
> > I my case, the story is similar has I've seen as much as 1.9Bar on
the
> > dash gauge, a figure I've never seen before. And the car feels
faster
> > than ever, even with 3 guys + tools aboard heading for parts hunting
in
> > a scrapyard yesterday.
>
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