[ZLRob]

Originally Posted by KingLT1

All a pulley will do is increase power on the first hit, then the blower is hot enough that you lose the added power because IAT is up in a range where timing will be pulled to keep from getting knock retard. Adding ethanol fixes a lot of short comings from the cooling side of the stock blower. Your best bet if limited to 93 octane is to do Intake, headers, ported blower. Gain power through efficiency improvements...not by forcing more hot air through a system that is limited by cooling and flow restrictions.

Spot on.


OP pulleys are a waste of time on an otherwise stock set up OP because all it does is heat up the blower and the stock set up is already maxed out in the configuration it is in. You will create a lot of knock and the engine will pull timing then rob you of even more power.


It's a vicious cycle on these set ups, so it's best you make the effort to tune, switch to ethanol which will allow the engine supercooling AND THEN you can start changing out pulleys. If ethanol fueling is not available then the best thing to do are airflow efficiency upgrades. Cam, ported or larger blower, etc. But you don't want to spin the blower faster in your current configuration.


Basically everything that King said.