I'm running the 4.5 7psi is it too much on the stock block for the 4.25 pulley on 93?
P1sc pulley size boost
- Thread starter basspro302
- Start date
I am running a stage 2 p1sc with the 4.25 pulley on 93. Also have a bap, plugs, and id1000 injectors. 9psi at around 7500rpm with boss mani. Not to many miles but no problems yet. Car runs perfect.
Did you jump straight to the 4.25 pulley? I have the same setup minus the boss mani and I have 3.31 gears
Yes. I got a tuner kit and it came with the 4.25 pulley. Also thinking of going to 3.31s. 1st and 2nd are all but usless with the 3.73s once you step on it.
adult photo sharing
Last edited:
I'll probably switch it to the 4.25 next spring. The 4.5 pulls hard way up top In the rpm. I might do a wastegate setup I'm not sure yet figured I would try the 4.25 first. I'm hopping to be able to run mid 10s once I get it sorted out.
I thought about a wastegate setup at first but with the 3.73s it gets into the boost really quick. I can see a wastegate being more beneficial with the taller gearing. I am still on the stock 255/40 P-Zeros (LOL) and they have broken loose at 80+ in third gear. Going to a 305 rear tire setup after the winter. If it still blows the tires off in second I will switch to the 3.31s at some point. Boost is a lot of fun
I have 305 nitto drag radials and I have to pedal it but it's only 50 degrees hear so it's hard to keep heat in the tires. Im already itching for more boost I hope I don't need a bap for it
If you are upping the boost to 9psi+ a BAP is highly recommended. And you should definitely have bigger injectors.
I have id1000 my tuner said a bap probably wont be needed so I'll see when I log it
From notes, my P1SC1, stock pulley was 4.38", per Prochager every .1 reduction is ~ 1 psi. If I remember right, I'm running a 3.85", 12 psi, wastegated down to 9 psi.
Stock, id1000s, BAP, meth
Stock, id1000s, BAP, meth
Users who are viewing this thread
