04-11-2017, 10:49 AM
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#24 (permalink)
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Enthusiast Member
Join Date: Dec 2014
Location: Nashville
Posts: 301
Drives: Nissan 370Z Sport
Rep Power: 12
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Quote:
Originally Posted by kentmo280z
I just found this from 1 Slowz "the factory crank pulley is 146mm
SO an 88mm pulley would be 146/88 x 7500 x 7.5 = 93324rpm "
So a larger crank pulley appears to make the s.c. spin faster.
A) My setup 90mm pulley w/ stock crank 146 mm pulley -146/90 x 7500 rpm x 7.5 ( SC gear ratio) =91,250 rpms
B) Using a 150mm crank pulley, 90mm s.c pulley 150/90 x 7500 x 7.5 = 93,375 .
This is if my formula is correct???
THINK I'LL DISREGARD THE CRANK PULLEY IDEA.... DON'T EVEN KNOW IF DIFFERENT SIZES ARE AVAILABLE..
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Yes a larger crank pulley will increase the rpm of the supercharger. If your belt is slipping already though I don't know how much this will help. The reason people go with smaller supercharger pulleys instead of larger crank pulleys is because the larger crank pulley will also make everything else spin faster(alternator, ac comp) which has parasitic loss on the motor. You may net 7hp out of a larger crank pulley and 10hp out of a smaller supercharger pulley. This is my understanding someone correct me if I'm wrong
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Stillen G3, z1 Intake Manifold, Stillen Headers, Z1 HFC's, Stillen Catback. 330whp 267 ft- lbs tuned at Z1 motorsports.
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