[s-cars] Too much boost

[Tom Mullane]

Ah!  Forgot to mention:

The WG spring is cranked down one turn.  

When Mihnea tuned the car, he turned the spring down three turns
before we hit the road for tuning.  When we returned, he told me to
crank it back two turns.  To access the screw, I had to drill out the
cap, so she was a virgin before the tuning.

I'll try to back it off one more turn and report back.

Thanks, Bob!

Tom

On 8/9/05, Robert Myers <robert at s-cars.org> wrote:
> 
> Tom,
> 
> Have you cranked down on the WG spring perch bolt?  If so, try backing it
> off a couple of turns.
> 
> 
> At 06:47 PM 8/9/2005, you wrote:
> 
> 
> S'ers,
> 
> I have been chasing a strange problem in my 1995.5 and I am stuck. 
> Looking for some ideas.
> 
> I'm running an RS2 manifold and turbo, Racetronix injectors, and
> Mihnea software.  I see 28ish psi in second and third gears, but I can
> see as high as 31.6 in fourth and fifth.  Not good.  Boost numbers are
> the same whether displayed on the TDS-1 (Kevin's integrated boost
> gauge) or on an analog gauge, so I'm fairly certainly that the boost
> readings are accurate.  Further, since Kevin's gauge reads directly
> off the pressure transducer, I assume that the ECU is "seeing" the
> same boost numbers that I am.  In short, it appears that the ECU is
> dictating these high boost numbers, or at least has no way to control
> boost at these numbers.
> 
> This problem is not new, but rather something I have seen  as long as
> I can remember.
> 
> So far:
> 
> The WGFV has been changed with a brand new one.  
> 
> I ran Marc S's ECU (his chip is a clone of mine) with the same result.
>  Marc does not has this problem, but runs a different turbo.
> 
> I swapped chips in my ECU from Mihnea custom to Mihnea "generic".  The
> generic chips have been extensively tested by Bob Myers in a basically
> identical car without this issue.
> 
> Marc and I swapped altitude sensors.
> 
> I have no boost leaks.
> 
> If I unplug my WGFV the max boost I see is 7.2 psi, so no obstructions
> in the hoses to the WG.
> 
> I inspected the WG diaphram, which looks good.
> 
> One other tidbit:
> Kevin's gauge also flashes a question mark in "boost hold" mode when
> the car is under boost.  This may or may not mean anything.
> 
> Any suggestions are welcomed.  TIA.
> 
> Tommy Headgasket
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