[s-cars] Severe Overboost

[Joseph Pizzimenti]

Ed,
Sounds like a wastegate problem.  You still have the
stock spring in there?

Joe
--- Ed Walsh <rundeep_32 at yahoo.com> wrote:
> Guys,
>
> My S6 with newly installed 1+ software and GM 3 bar
> sensor is boosting to over 28 PSI, even though it
> should see 22-23 max.  Not good.  When it does this,
> boost builds very quickly at low RPM (2,200)then
> rockets to ~28 or so PSI by 4,000 rpm, but  without
> the corresponding kick.  Clutch is not slipping.
> When
> it hits ~28 PSI, the over boost safety circuitry
> sharply backs off the boost until it is under
> control,
> then it starts to build again around 5,000 rpm. The
> car does accelerate, but not with the oomph you
> would
> expect at those levels.
>
> I figured out how to swap chips in the ECU so I
> tried
> some III+ SW and the car still over-boosted.  So it
> must be something else on the car that is not
> functioning or is there a hose disconnected, etc?
>
> Thank you, Ed
>
>
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