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      05-20-2025, 08:25 AM   #42
bigjae1976
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2013
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Drives: 11 E90 M3 Individual
Join Date: Mar 2006
Location: Houston, TX

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2004 BMW M3  [6.33]
2011 BMW E90 M3  [6.83]
2013 BMW 328i  [6.67]
Quote:
Originally Posted by aus View Post
Nice job!
Just wondering if my AA underdrive pulley would help with this or the shims would still be useful?
.
Underdrive pulleys will help a little but the shims are far more effective. The limitation is how much the pump can be underdriven before losing PS at low RPMs which is when you need more power assist. Also risk damaging the pump. The pump is pumping air when you lose PS assist which will cause pump damage.

The shims give more assist when you need it, less when you don’t. Only costs $20.
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