Boost never higher than 2.5psi 535xi
#11
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My Ride: 535i
Model Year: 2008
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I don't think you can change the vacuum on these cars at all. It's a mechanically driven vacuum pump. Faster it spins, more vacuum it makes. So blipping the throttle makes the pump spin faster.
It's either bad wastegates, bad solenoids (unlikely) or boost leak. I would check entire intercooler system for leaks. Try to get to the wastegate arms and see how much play they have.
It's either bad wastegates, bad solenoids (unlikely) or boost leak. I would check entire intercooler system for leaks. Try to get to the wastegate arms and see how much play they have.
#12
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