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Boost never higher than 2.5psi 535xi

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Boost never higher than 2.5psi 535xi

Old 01-06-2019, 01:11 PM
  #11  
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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.
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Old 01-07-2019, 12:19 PM
  #12  
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Originally Posted by Kaane View Post
It's a mechanically driven vacuum pump. Faster it spins, more vacuum it makes. So blipping the throttle makes the pump spin faster.
I agree with this, hence my confusion as to why my vacuum levels drop when I hit the throttle. I don't have any evidence of vacuum leaks, so I should check for boost leaks as you say. That aside, I still would like to know if anyone has reference values for what my vacuum levels should look like when the vehicle is under load. Thanks.
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