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Originally Posted by stateofidleness
at the risk of sounding like the village idiot, can someone explain what an underdrive pulley does exactly? Do you lose/gain functionality of any other systems (AC, etc), and what is all involved with the installation?
-Village Idiot
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In layman's terms, by reducing rotational mass and under driving the vehicle's "accessories", the lighter weight pulley draws less power from the engine . No functionality is lost. However, some have reported that under extreme conditions when all of the vehicle's accessories (i.e. a/c , headlights, radio, wipers ect..) are being used at the same time, rpm's may fluctuate at idle . As far as installation is concerned, it's chicken scratch at first. However, once someone has done one - it's a breeze.