What do I need to run more than 8psi on the JRSC?
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From: Dark Aether
Re: What do I need to run more than 8psi on the JRSC? (1badITR)
The stock blower pulley for the ITR and and Si is 4.2 inches. It's a "6 psi" pulley for the Si and a "5.5 psi" pulley for the ITR.
Generally, for every .2 inch decrease in the pulley diameter, you get a 2 psi increase in boost. I had the 4.0 inch pulley on my Si and it was the "8 psi" pulley.
IMO, the best way to do the boost upgrade is via an alternator stepper pulley like Endyn's or Motorvation's (wheelking@webtv.net).
Changing the blower pulley is a pain in the butt and it voids the warranty on the blower. Also, if you go too small on the blower pulley, belt slip can become an issue.
Changing the crankshaft pulley is usually also a pain in the butt and the increased boost is created by overdriving the alternator.
The stepper pulley does not effect the speed of the alternator/power steering and it does not modify the blower. It's a pain in the butt to do as well, but it's the cleanest way, IMO.
Sonny
Generally, for every .2 inch decrease in the pulley diameter, you get a 2 psi increase in boost. I had the 4.0 inch pulley on my Si and it was the "8 psi" pulley.
IMO, the best way to do the boost upgrade is via an alternator stepper pulley like Endyn's or Motorvation's (wheelking@webtv.net).
Changing the blower pulley is a pain in the butt and it voids the warranty on the blower. Also, if you go too small on the blower pulley, belt slip can become an issue.
Changing the crankshaft pulley is usually also a pain in the butt and the increased boost is created by overdriving the alternator.
The stepper pulley does not effect the speed of the alternator/power steering and it does not modify the blower. It's a pain in the butt to do as well, but it's the cleanest way, IMO.
Sonny
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