I have 3 Procharger pulleys and PSI # on my setup but how much PSI for the 4.0 pulley?

[Unas2k5]

I have the following Procharger P1X pulleys and what they made in PSI on my car. Only change since then is that I went from high flow cats to zero cats.

4.75 = 7.75PSI
4.25= 10.63 PSI
3.5=21.3 PSI (E85 only pulley)

I want to find a good 93 pulley for my setup I currently have the 4.25 on. I am also on a built 9.5:1 CR motor. I’m only making 618WHP and 493WTQ on this 4.25

I’m thinking of going down to a 4.0. How much PSI would that be ? Or 3.9? 3.8?

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[robvas]

Try this...

That line between 4.25 and 3.5 is 3.875

 

[Unas2k5]

I guess each tenth is 1psi on a stock car

Try this...

That line between 4.25 and 3.5 is 3.875

Thank you. So you think a 3.9 pulley will give me about 15PSI? I saw Brenspeed ran 14.5 PSI on a 93 9.5CR. It made 760WHP.

 

[5.0_Lojos]

I'm currently on a 4.25" on pump gas. P1sc1 stage 2. Wengerd Tune. Logs were a 4" would be interesting. Need to dyno in the near future.

 

[jpjr501]

D1-X here, 12 psi making 770HP on a 120MM (4.5ish) pulley with E85. Like the blower is saying, really, you have the largest pulley on me wuss. It's not even sweating.

The head unit, fuel and compression is the factor here. You'd have to be under a 4" pulley to make some steam.

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