I have an LHT modded JRSC on a gsr with the 3.8 nose pulley and it is boosting 11 psi on the AEM EMS readout when I datalog.

I am assuming that the stepper pulley is the Endyn 8-9 psi pulley.

If I want to go to a regular size larger alternator pulley than the Endyn stepper pulley will it still be a double belt size pulley or how does this work?

Does anyone know where I can get such a stock size pulley and belt that will do this trick for me?

 

The Endyn pulley is a double pulley like the stock JR one. The Endyne has one larger pulley and one regular size one, the larger pulley is closer to the Alt itself which drives the blower. The Endyne over drives the blower abour 13% over stock JR.

Remember when you Data log intake temps, the stock intake sensor is only cooled by one core,if measured right at the port where it enters the cyl head you will find it's about 40 degs lower.
Hope this helps.