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blower pully size vs boost

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Old Nov 26, 2014 | 08:11 AM
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Default blower pully size vs boost
Im running a 8 rib kit on mu procharged lt1, i ordered a few pulleys and forgot what psi each size is. I understand engne mods dictate boost.
Pulley size on blower is 3.70
Engine is 388
Le3 heads
Pacesetter longtubes into y with bullet
Rev limiter 6800rpm
Blower cam

I also have a 3.40 pulley
And a 2.8x pulley

If anyone could help me determin what boost these pulley will put out would be a great help. Thanks
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Old Nov 26, 2014 | 08:35 AM
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Depends on crank size... I ran a 7.0 pulley with a 4.50 in pulley on my F1C and it made 14 psi. I was spinnning the blower at only 56k rpm when the car was a 7000.
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Old Nov 27, 2014 | 01:19 AM
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You don't even say what blower you have...
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Old Nov 28, 2014 | 09:01 AM
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F1 blower
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Old Nov 28, 2014 | 05:51 PM
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Originally Posted by 96TransAmboosted
F1 blower
I'd go with the 3.70 pulley and see where you're at boost wise, as the F series of blowers have a different gear ratio than the smaller blowers. I was seeing 18 to 20 psi with an F-1A on my 408 - 9.5/1 compression with a 3.90 pulley. Bob
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Old Nov 29, 2014 | 01:40 AM
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Originally Posted by 96TransAmboosted
F1 blower
Is it just the regular F1 or one of the other 53 variations of....
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Old Nov 29, 2014 | 06:44 PM
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Originally Posted by Bob@BruteSpeed
I'd go with the 3.70 pulley and see where you're at boost wise, as the F series of blowers have a different gear ratio than the smaller blowers. I was seeing 18 to 20 psi with an F-1A on my 408 - 9.5/1 compression with a 3.90 pulley. Bob
Bobs the Man on ProChargers.
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Old Nov 30, 2014 | 06:58 AM
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Originally Posted by BLNLS1/RX7
Bobs the Man on ProChargers.
Thanks Steve, I appreciate it! Bob
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Old Dec 3, 2014 | 01:12 AM
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Originally Posted by Bob@BruteSpeed
I'd go with the 3.70 pulley and see where you're at boost wise, as the F series of blowers have a different gear ratio than the smaller blowers. I was seeing 18 to 20 psi with an F-1A on my 408 - 9.5/1 compression with a 3.90 pulley. Bob
Hey Bob, what kind of pulley set up was you using (8 rib, 10 rib, clog)?
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Old Dec 3, 2014 | 07:51 PM
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Originally Posted by Monte4ever
Hey Bob, what kind of pulley set up was you using (8 rib, 10 rib, clog)?
I was using the stock J bracket with an 8 rib pulley, which required tightening up the belt every run. Bob
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