Diameter of 9lb JRSC pully ???
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From: Windsor, Ontario, Canada
Diameter of 9lb JRSC pully ???
Can someone with a 9lb JRSC pully do me a quick favor? Can you measure the Diameter of the pully and let me know. I'm looking to make one out of AL. but need to know the OD of the thing. I'm not sure at what RPM the SC needs to spin at to make 9lbs of boost so I can't really calculate the diameter.
Thanks!
Thanks!
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From: somewhere in the valley,, BC.
Here's the deal.
On my jrsc GSR, the stock 82mm pulley showed 6psi, and the 72mm pulley showed 9.5psi. This was with 1.8L of displacement, 2.5" exhaust, and SRI.
The same pulley 72mm pulley on my b16 setup is showing nearly 11psi. This is with an Apexi WS exhaust and SRI. When I removed the Apexi exhaust, my boost went down to 10psi. This tells me that boost is dependant on a number of things, especially displacement.
With that said, your H22 setup will be completely different than the B series. However, in and around 70mm should give you the ability to run close to 9psi.
On my jrsc GSR, the stock 82mm pulley showed 6psi, and the 72mm pulley showed 9.5psi. This was with 1.8L of displacement, 2.5" exhaust, and SRI.
The same pulley 72mm pulley on my b16 setup is showing nearly 11psi. This is with an Apexi WS exhaust and SRI. When I removed the Apexi exhaust, my boost went down to 10psi. This tells me that boost is dependant on a number of things, especially displacement.
With that said, your H22 setup will be completely different than the B series. However, in and around 70mm should give you the ability to run close to 9psi.
Joined: Jan 2003
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From: Manchester, NH, USA
Boost is simply what happens when you restrict a flow. With the supercharger spinning at, say, 5000 rpm (motor speed), you will get more boost with a more restrictive moroe, because less of the air is actually getting sucked in and it's backing up.
If you built a crazy motor with lots of head work and cams, you might only get 4 psi, but you would still have similar airflow and make similar power, maybe more power.
If you built a crazy motor with lots of head work and cams, you might only get 4 psi, but you would still have similar airflow and make similar power, maybe more power.
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From: Windsor, Ontario, Canada
Thanks guys, this is exactly what I'm looking for. My 6psi pully actully gives me 7.5psi. with an apexi N1 and I know many guys that install hi-flow cat's it usually goes down another 0.5psi.
I think I'll go with a 70mm.
BTW, if anyone wants custom Aluminium SC pulleys, I'll be making them for dirt cheap real soon! but that's another subject....
I think I'll go with a 70mm.
BTW, if anyone wants custom Aluminium SC pulleys, I'll be making them for dirt cheap real soon! but that's another subject....
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From: Dark Aether
Re: Diameter of 9lb JRSC pully ??? (Paluce)
Are you talking about the pulley on the nose of the blower?
B16/B18C5 (Civic Si/ITR)
4.2" = 6 psi (stock pulley)
4.0" = 8 psi
3.8" = 10 psi
B18C1 (GS-R)
4.0" = 6 psi (stock pulley)
3.8" = 8 psi
3.6 = 10 psi
The numbers are usually stamped right on the pulley itself. If you're planning on replacing the pulley, you'll need a thin 1 1/2" open end wrench and a gear puller. Do NOT pound the pulley off...you can damage the seals in the nose of the blower.
Sonny
B16/B18C5 (Civic Si/ITR)
4.2" = 6 psi (stock pulley)
4.0" = 8 psi
3.8" = 10 psi
B18C1 (GS-R)
4.0" = 6 psi (stock pulley)
3.8" = 8 psi
3.6 = 10 psi
The numbers are usually stamped right on the pulley itself. If you're planning on replacing the pulley, you'll need a thin 1 1/2" open end wrench and a gear puller. Do NOT pound the pulley off...you can damage the seals in the nose of the blower.
Sonny
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