What size pulleys are offered for the 4.0?

I need to know how much boost each diameter pulley produces.

 

PHP (Pauls High Performance) and RPMoutlet both sell the pulley for us V6 guys!!

 

There are an abundance of pulleys. Depending on your altitude, you will see different results.

I needed a 3.2" pulley to get 9psi here in Colorado Springs (6400ft). That same pulley would get you 11psi at sea level.

3.4" will net 9psi at sea level
3.6" will net 7psi at sea level

I'm pretty sure ArmyCook was running a 3.1" pulley for 12psi at sea level.

That is on a P1SC. If you need D1SC pulley numbers, let me know.

 

I got 9 PSI with a 3.4
and 12 PSI with a 3.1

 

@ranebowcyxx

That is with a P1SC, right? That's pretty much the same as ArmyCook reported....

 

Yes sir, you are correct.

 

i actually almost get 13 psi with the 3.1 ... ive hit 14 psi on the road..

Shortly after i blew two spark plug th
When I called to upgrade at the point. The guy kinda didnt want to sell me a 3.0 because he said he didnt know about slippage and the engine could handle it. .... :-))

Im still waiting for a freaking reply back from them in regards to upgrading even further to probly a 2. 8 or something to net apx 18-20 psi.

 

I had a minor slippage problem. I talked with James and he's sending me out a new belt. It was because I started using the smaller pulleys. Mine shipped with a belt designed for the 3.6" pulley (since RPM gave the wrong info when they placed my order). I'm using the same belt on the 3.2"! They're sending a belt that'll be good for anything from 3.0" to 3.2".