[s-cars] Overboosting.

[Tom Mullane]

One more tidbit:
 I am using Kevin Day's TDS-1 boost gauge, which recieves output from the 
ECU, so the issue is *not* that the ECU is unaware how much boost the car is 
making.
 The high boost levels have been verified both with Kevin's gauge and with 
an analog gauge, so no issues with the TDS-1 either.


 On 9/2/05, Tom Mullane <tmullane at gmail.com> wrote: 
> 
> Folks,
>  I have a strange problem with my 95.5, and I can't seem to get to the 
> bottom of it. The car will overboost to 30+ psi in fourth and fifth gears. I 
> assume it would do the same in the lower gears, but it accelerates fast 
> enough so that pressure is unable to build to these levels. 
>  Some background: The car has 82k on the clock, RS2 EM and turbo, 
> Stromung, 34 lb/hr racetronics injectors, stock MAF, Hyperboost BPV, and 
> Mihnea's custom tuning. Wastegate spring is at the factory setting. There 
> are no boost leaks or ingition problems. Since Marc S is running a nearly 
> identical set-up (034efi turbo and stock exhaust are the only differences), 
> I have been swapping parts back and forth between our two cars, attempting 
> to isolate the issue. Marc's car runs about 26 psi. 
>  So far I have: 
> Reverted back to Minhea's "off the shelf" standard chipset for the RS2/34# 
> combination
> Swapped ECU's 
> Swapped the altitude sensor
> Installed a new WGFV
> Unplugged the electrical portion of the WGFV and observed 7 psi max boost
> Swapped the wastegate
>  Since I just recently started running an installed boost gauge, I have no 
> idea how long this problem has existed. I suspect it was there even last 
> year when Mihnea tuned the car. Before we went out, he had he uncap and 
> crank the WG down 3 turns, but after the tuning he told he to crank it back 
> out 2 turns. 
>  I'm running out of ideas. Anyone?
>  TIA
>  Tom
>