Boost Creep?

meathooker · Feb 8, 2010

i am just now getting some good seat time on my turbo. after a decently long pull my sled started to "flutter" and my boost gauge was moving rapidly from 10-14 psi. it did it for two pulls, then not again for the rest of the day. it doesn't do it at lower elevations in the fields during longer pulls; only at the hill.

i'm thinking it is boost creep and i need to port my wg; what are your thoughts?

POLARIS600cc · Feb 8, 2010

What were you running for boost the rest of day? I don't think what your describing is boost creep.

meathooker · Feb 8, 2010

running 10-11 pounds. my buddy who is big into turbo cars suggested boost creep but i always thought it was slow rise; not a spuratic up and down like i had.

Vertical Asshauler · Feb 8, 2010

Did you check for boost leaks and all the vac lines all have a good/tight connection? Maybe the boost gauge is faulty, seen that before.

meathooker · Feb 8, 2010

Vertical Asshauler said:
Did you check for boost leaks and all the vac lines all have a good/tight connection? Maybe the boost gauge is faulty, seen that before.

i checked everything on the mtn; ill go through them in the shop again. the boost gauge seemed to be fine the rest of the day so i dont think that is it. also the motor was surging at the same time so i dont think it was the gauge.

Snowstar · Feb 9, 2010

I had the same issues with the motor and the boost surging like you describe. Never did figure it out.

POLARIS600cc · Feb 9, 2010

last time i rode my sled, had fuel filter plug up. caused it to go dead lean at wide open throttle. would lean pop and boost would surge like your describing. what was your afr showing during the surging times?

meathooker · Feb 9, 2010

i was pulling pretty consistant 11.9 to 12.2 all day at wot. i didnt notice the afr at that time. i'll check it out next time i ride if it happens again.

Kestrel2126 · Feb 9, 2010

I have had this happen before as well. What were your RPM's hitting when this was going on. You could be bumping the rev limiter. The other likely cause, as others mentioned, is some sort of a leak, causing inconsistent boost to the motor. The other could be a lean condition at that particular boost and RPM level causing bad fire. Hope this helps find the issue.

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Boost Creep?

meathooker

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meathooker

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Vertical Asshauler

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meathooker

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