zachdaddy

I have the APR Stage III kit and, under full throttle, my boost gauge is pegged at 25psi (who knows how much higher it is going!). Once pegged, my car starts to shudder, kinda like a fuel cut or detonation. Anyway, how can I solve this problem? I would like to run about 20psi. APR told me that the 25psi boost is "normal," but is clearly not interested in addressing the issue. I have the original version of the 91 octane software. Thanks - Chris

Stratocaster1422

look up Ray Kahn....he'll tell you all about an overboosted Stage III

nospek3

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markbradford

Some of the people who work the phones specialize in working phones. =/

Be careful in the meantime - Ray Khan had a similar issue after his install pinched a hose and he ended up blowing the powerplant. Take it easy until it's fixed.

Audi2ptzero

You might want to think about putting a EBC on it to hold the boost right at 20psi.

Liam in Montreal

boost gauge showing 25psi and up, even saw 30psi spikes sometimes. faulty BPV? spark plugs?

Audi2ptzero

If your producing spikes of 30psi your over spooling the turbo by the time you reach 6k rpms, this would also put your injectors at their max and end up running lean. The very high pressure inside the cylinder could also be blowing out the spark causing the misfires, the tuning is just not setup to handle that high of a boost.

Ray Khan

it ended up being the N75 to wastegate vac line being pinched. I would check the vac lines of the N75 as a first step. When I logged 115, I would see a normal requested boost and a wacky, high actual boost. Definitely stay out of boost until you get this resolved.

nospek3

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Passat_B5

For me, it ended up being a faulty N75 valve. Boost would build up to b/w 25-30 psi and car would shudder as you described. Definately check vac lines to N75 or valve itself.