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Old 08-12-2019, 02:54 PM
e39_touring e39_touring is offline
Join Date: Mar 2007
Location: Seattle, WA
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Originally Posted by Happy View Post
So how much boost would the 2.5L pulley create on a 3.0?
If it were directly proportional to displacement (which I don't think it is), it would be about 5.5 psi.

Looking this up, maybe Boyle's law of gases applies?

In this case it would be

V2=(P1*V1)/P2, which transforms into P2=(P1*V1)/V2

...adding real #'s (pressure in atmospheres)

P2=1.23 atm

(1.23*14.7)-14.7= 3.4 psi of boost

I'm sure someone will get their geek on and check this math & application of gas law theory, but it should be a good ballpark.
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