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help! cant figure out which pulley to use!

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Old Feb 26, 2015 | 10:40 PM
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ViceCityPerformance's Avatar
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Default help! cant figure out which pulley to use!

Shooting for 8 psi tvs2300...
Stock cam (no overlap)
Nick Williams 102
And longtubes.

The throttle body supposedly adds boost... that is whats throwing me off
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Old Feb 27, 2015 | 08:35 AM
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more flow less boost.... go by the rpm % of the blower not the boost level. Boost level described amount of restriction. for instance, Crank pulley size/BLower pulley size X (step up ration of Blower) X Max RPM= RPM of blower. My example on my F1X is 7.0/3.75X5.40X7200=72,576 rpm of the blower at 7200 rpm... Now boost level will change depending many other factors.
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Old Mar 2, 2015 | 09:40 PM
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Originally Posted by scottywheels
more flow less boost.... go by the rpm % of the blower not the boost level. Boost level described amount of restriction. for instance, Crank pulley size/BLower pulley size X (step up ration of Blower) X Max RPM= RPM of blower. My example on my F1X is 7.0/3.75X5.40X7200=72,576 rpm of the blower at 7200 rpm... Now boost level will change depending many other factors.
Thanks for enlightening me, but with this information i still cant pinpoint which is the proper size for my goals.

Power wise i want to match what a stock zr1 can do if its within reason.
Stock valve train, great intake, full exhaust is what I got. What pulley size do i need to make that kind of power with my new tvs 2300? And who sells quality pulley kits for magnachargers?
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Old Mar 2, 2015 | 10:03 PM
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I wouldn't shoot for a boost number
Lots of different factors will determine psi
Heads/cam/exhaust flow
Air intake/tb/snout

I'd leave the stock pulley on for now and see if youre satisfied with the power
If not dropping .1 in upper pulley size usually increases .5-1 psi

Overdrive crank pulley will usually net 3-4 psi, and can be used with a smaller upper pulley to really spin it
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