Originally Posted by
differentK
welcome to the family- its a small one. I never played with a JRSC A3 so i don't know what pulley sizes turn out what boost- but if you are looking to make over 9psi, I would suggest some sort of cooling. Meth injection is great, I run a 3gal AIS kit myself. I would start with the 4.0 pulley, use the calibration in kpro, get it running and see how you like it. just remember, more boost more cooling... these blowers create a lot of heat so if you want your engine to last you need to address that.