I bought this pulley as a 9psi for AP1 Comptech, but going by SOS's charts it seems to be a higher psi pulley than that. I may be measuring it wrong. What size is this?

 

That's 3.4". Thats going to put you around 12psi I believe. SOS's chart always conflicts with what CT tells me. SOS's chart says the 4.4" pulley for AP1 is stock boost, but in truth the 4.6" from CT is stock boost.

 

maybe CT measures their pulleys like above, then. i know the SOS guys measure their pulleys from the top of the teeth.

 

There's nothing like confusion!!!!!!!!!!!!!!!

 

Ok, so whats the max size pulley on an AP2 with stock injectors?

 

You are correct. We at Scienceofspeed measure our pulleys at the actual ride height of the belt on the pulley. Where Comptech and alot of others will measure the actual OD of the pulley not taken in to consideration the lip needed so the belt wont slip off. You can always use our reference guide on our website but you have to take into consideration when measuring the pulley that you need to measure at the actual ribs not the OD of the pulley. As long as you measure the same way everytime for any pulley you could use our rough chart.

 

After looking at your photos i would say its around a 3.3-3.4 pulley so i would say thats around a 11-11.5 psi pulley. But not sure with out measuring it with a caliper.

 

you are right

 

yeah, you need to measure teeth-->teeth