[s-cars] Overboosting.

[calvinlc@earthlink.net]

Have you verified that the duty cycle of the computer to the WGFV is 0 when
you go over the boost setpoint?  If not, then for some reason the computer
still thinks it should be pouring on the boost.
--Calvin


-----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 9:04 AM
To: Pasqualoni, James E
Cc: S-CAR-List at audifans.com
Subject: Re: [s-cars] Overboosting.


Jim,
 I have used both the K valve and the stock H valve with the same result.
Currently the K is installed. My spare H is in Marc's car after his H quit
last week. The problem seems to occur with either valve.
 Scott Mocky's site makes a comment about the MAF in overboost. That may be
my next swap. Unfortunately, Marc is out of town for the long weekend, so I
have no parts bin.
 Tom

 On 9/2/05, Pasqualoni, James E <james.pasqualoni at gs.com> wrote:
>
> 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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