Quote:
Originally Posted by Scott65
Tom. with the included pulleys, what kind of boost would this unit be making at 5500-6000 crank rpm?
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There is ONE included Pulley, the Supercharger mounted 3.0" pulley.
If you had a 6" crank drive pulley then the belt pulley step-up ratio would be 2
(6 divided by 3 =2)
If the supercharger INTERNAL step-up ratio is 4.14 then 4.14 times 2 =
8.28
If the engine is running 6000 rpm then 6000 times 8.28 = 49,680
supercharger rpm which should be close to 12 psi of boost pressure.
(It depends on the rest of the engine what the boost pressure is.)
With a 7" crank pulley the supercharger would be turning 57,960 rpm.
Enough to make over 15 psi of boost pressure on the typical Pontiac 400 engine. Don't race Boost, go for mass flow thru the engine and wheel dyno confirmation.
Procharger advertising says that the P1SC supercharger has the ability to make over 800 hp on the typical engine at max supercharger rpm. Max Supercharger RPM typically 60,000 rpm.
Luhn Performance made 862 HP at 5300 rpm with a basic 440 cid engine on the dyno at 13 psi.
(Vortech Supercharger though).
Tom V.