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I have an A trim on my car with shows about 6 PSI at 5700 rpms. (2.87) top pully. So I purchased a 2.62 inch size thinking I should get the boost up to around 8 PSI. After I get it (today) I start reading the posts on getting more boost via pully size and I see most people use a 7 inch Crank pully (I have a 6 inch ) with a larger top pully then the one I purchased. I'm I going to end up with nothing but a Belt that slips? Next time I read the posts before I buy anything. Thanks for any input.
 

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7" crank, and 8 rib setup is the way to go. Since you're using an A-trim, i assume your running a 6 rib setup, which means that belt is doing nothing but slipping. On my car, i am running a 3.33 blower and 7" crank, and im seeing 8psi, even with a full H/C/I setup.
 

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Good luck trying to get the 2.62" 6-rib pulley not to slip. You will need a longer belt also.
 
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