Low boost/lack of power MC2-engine (MC dual knock)

Dag Bøsterud dag.boesterud at consulgranada.net
Mon Mar 16 10:17:35 PDT 2009

I agree that the problem sounds related to a turboleak.
But lets say it is a turboleak. How can a turboleak only occur
after 30-60 minutes of driving? And if I turn the engine off and let
it sit for a while, boost is again up to what it should be, 1.4 bar.
I mean.. a periodic turboleak? Even plausible?


----- Original Message ----- 
From: "John Cody Forbes" <cody at 5000tq.com>
To: "urq" <urq at pacbell.net>; <quattro at audifans.com>
Sent: Monday, March 16, 2009 3:54 AM
Subject: Re: Low boost/lack of power MC2-engine (MC dual knock)

> urq wrote:
>> The wastegate spring is weaker on the MC engines to allow for a safety
>> feature that prohibits max boost when problems are noted by the ECU
>> ... but it also makes it so that the engine can't make full power
>> unless the spring gets augmented by pressure applied to the upper
>> chamber of the wastegate via the WGFV.
> BUT the wastegate spring alone will produce 1.3bar (not 1.0bar), the WGFV
> brings the boost up to 1.45.
> http://www.sjmautotechnik.com/trouble_shooting/boost.html - A great place 
> to
> read about boost related issues and fix ideas.
> -Cody Forbes
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