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2016 GT P1X HO KIT

S550_LGND

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I’m running a Procharger P1X H.O. Kit With a 3.40” pulley Getting About 9-10psi Of Boost & I’m wondering what’s the smallest pulley I can use on it to Up the Boost. Anyone know? Thanks.
29E51121-264B-4ED3-B31C-3B0D709637D1.jpeg
 

SpaceCityS550

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You'll need to let us know if you're on 93/e85. You will be octane-limited if not on e85.
 

S550_LGND

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I THINK....you should be seeing more than 9-10psi with a 3.4 pulley on an HO. so you likely have belt-slip
No belt Slip I Was Seeing 11-12psi But i Built My Motor With 9:1 Compression Pistons So I’m Seeing A Little Less Boost Which is Why I Want To Up The Boost A Bit If Possible With a Smaller Pulley.
 

turnswrench

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You can only spin the head unit out to a max of 65,000 rpm. You're probably close using the factory harmonic damper.
 

Boduke0220

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Should’ve kept it 11:1
 

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SheepDog

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With the 3.4 pulley, you are at the maximum recommended RPM (65,000 rpm) of that blower at 7500 RPM engine speed and the OEM diameter Harmonic balancer. You might check for boost leaks though, Even at 5,000 feet above sea level I see 11PSI with the same pulley. My motor is still 11:1. I would expect more like 13-14 PSI with the 3.4 pulley at sea level and stock compression, exhaust, etc. The volume difference inside the cylinder between 9:1 and 11:1 shouldn't make a dramatic change in measured boost pressure. The volume of air coming out of the blower is many times that of the difference in actual space in the cylinder between the compression ratios.
 

Jay-rod427

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I see 14 psi at 54,000 blower rpm. yes built motor, and whoever is tuning, but seems quite low. You should be seeing more imo
 

ahl395

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It's low because of the low compression motor. If you're revving to 8k then your already at the blower's RPM limit. You will need a stage 2 setup to get any more out of it. HO is much more limited with pulley sizes.
 

yote41

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I have a 3.50 pulley on my p1sc ho kit and i see like 10 psi
 

yote41

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Idk how they are for p1x but for p1sc 3.5 pulley is good for 10 psi and 3.4 is 12 psi. Thats from procharger.
 

SheepDog

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They do make a 3.2" and 3.0" pulley. Of course you would be over-spinning the blower at high RPM's but if you don't spend much time above 7,000 RPM you would get more boost down low.
 

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