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      11-19-2012, 10:40 AM   #4
Jon@Bimmersport Automotive

Drives: E90 M3 Active Supercharged
Join Date: Jun 2008
Location: Mississauga, On Canada

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2003.5 BMW M3  [5.00]
Originally Posted by Superfly_M3 View Post
I thought ESS 575 (now 585) ran less boost - should be running 6psi.
When designing a supercharger system a formula is used of the crank pulley, and blower pulley etc that will approximate how much boost the supercharger unit will make spinning at that RPM. Based on sea level and also air temperature will determine the density of ambient air, slightly affecting how much boost pressure the S/C will make.

Right now in the colder months your car will make a bit more boost, and feel a lot snappier and quicker compared to the summer months.

Going ~1-2psi over or under will not jeopardize the reliability of your kit as your ECU will adjust for the denser air.