how many inches of vacuum does the S54 pull at idle?

[nextelbuddy]

stock S54, how many inches of vacuum does it typically pull at idle with no leaks and a healthy compression engine? my engine is down and I cant hook up a vac gauge to it right now and im trying to choose an appropriate BOV spring for my vac pressure at idle.

[mleveroni]

On a MAP sensor mine sits at -8psi at idle. According to google this converts to -16.3in of hg.

[nextelbuddy]

On a MAP sensor mine sits at -8psi at idle. According to google this converts to -16.3in of hg.

Thanks, I guess I should have asked what people show for -psi my apologies.

Thanks for the feedback

Hoping to see if any one else chimes in So I can get an average reading.

[nextelbuddy]

got 2 more answers from Facebook M3 group and 2 owners with boost/vac gauges confirmed at idle they get -16-19inHg range with stock cams

[eacmen]

I have seen closer to 20. 18-19 at sea level seems like what a healthy engine should be at.


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