[s-cars] Overboosting.

[Pasqualoni, James E]

What type of WGFV are you using Tom?  I had the same issue with my
Dahlback/RS2 stuff.  Boost would hit as high as 28-29 psi and would be peaky
at full boost and WOT.  I switched to a K-valve (haven't we discussed
before?) and boost stayed at a rock solid max 24 psi.  Apparently, the
K-valve is able to cycle faster and keep up with the more rapid buildup of
boost pressure relative to the RS2-type turbos.

Does Marc use a K-valve?

-----Original Message-----
From: s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com] On Behalf Of Tom Mullane
Sent: Friday, September 02, 2005 10:29 AM
To: S-CAR-List at audifans.com
Subject: Re: [s-cars] Overboosting.

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
>
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