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Old 09-28-2008, 08:48 PM   #1
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even more problems

So I just re-mounted my wg so that it will clear and allow the flapper to open fully=no more creep. It hits full boost (10psi) around 3-3.5K and feels real good getting there, BUT....it won't hold full boost for long. I don't know what it is, but once I hit full boost and continue to floor it, my revs jump up a bit as if I just disengaged the clutch, then they drop way back down. Meanwhile, I'm losing boost. What could be causing this? Is my clutch slipping/dying or is it another wg issue or what?


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Old 09-28-2008, 09:22 PM   #2
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sounds like the clutch to me. but it is hard to tell by the discription
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Old 09-29-2008, 05:22 AM   #3
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ya what clutch do you have
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Old 09-29-2008, 06:22 AM   #4
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the clutch would have nothing to do w/ the car loosing boost. If he is making full boost at 3k and then looses it at 5k while under full load, then its not the clutch. The clutch may be slipping yes, but it is not the cause of the problem of loosing boost pressure. When u rev ur car in neutral, u will still make boost same as if it were engaged.
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Old 09-29-2008, 07:27 AM   #5
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No it takes load to make boost with a turbo , My guess would be WG

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Old 09-29-2008, 08:07 AM   #6
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i was thinking the same thing, when the clutch slips the motor isnt under the same load. This sounds like a similar situation to another thread i saw where the wastegate was only rated for like 8psi and the dude could push 15 through it but as soon as he went to 18psi, it started to loose boost. They seemed to think that the WG was opening and not closing properly once it hit full boost.
made sense in my head
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Old 09-29-2008, 08:13 AM   #7
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Bad wastegate is causing your spike in boost. That's my assumption.
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Old 09-29-2008, 08:15 AM   #8
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Does it happen worse in higher gears? If the engine is reving up without the car accelerating(assuming you arent losing traction)...the clutch is slipping. May not be the only problem...
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Old 09-29-2008, 09:36 AM   #9
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^ Could be a vac leak somewhere also.
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Old 09-29-2008, 10:56 AM   #10
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eh, a vac leak would result in poor performance over the whole rpm range not just once peak boost is obtained...
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