Equation for calculating boost after a pulley swap.
06-19-2003, 06:03 PM
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Equation for calculating boost after a pulley swap.
FYI:
The following equation can be used to calculate the amount of boost after a pulley swap if you know the boost before the swap:
Boost after = Boost before * (old sc pulley / new sc pulley * new crank pulley / old crank pulley)^2
This is based on the Affinity Laws (a.k.a. Fan Laws or Pump Laws). I found it to be very accurate on my last pulley swap:
Boost after = 9.5 psi * (3.33 / 2.75 * 6.66 / 6.66)^2 = 13.9 psi
My boost guage now shows right at 14 psi boost.
Just thought some of you might find this useful.
Mike
The following equation can be used to calculate the amount of boost after a pulley swap if you know the boost before the swap:
Boost after = Boost before * (old sc pulley / new sc pulley * new crank pulley / old crank pulley)^2
This is based on the Affinity Laws (a.k.a. Fan Laws or Pump Laws). I found it to be very accurate on my last pulley swap:
Boost after = 9.5 psi * (3.33 / 2.75 * 6.66 / 6.66)^2 = 13.9 psi
My boost guage now shows right at 14 psi boost.
Just thought some of you might find this useful.
Mike
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