[Boxtaboy]

Originally Posted by Topless

Depends,
How big is your stereo? How big is your battery? How many hours are you idling without the occasional throttle blip?

The underdrive pulley was developed for motorsport applications to preserve the power steering pump and slow the accessories on a motor that spends a lot of it's time at high revs (4-6K). A side benefit is that it reduces parasitic drag so you get a bit more torque/hp to the rear wheels at all rpms. It is definitely possible to over think this simple device. It does not run your battery down during normal driving but it is not for everybody. If you spend long hours stuck idling in traffic with headlights on and the stereo cranked you probably don't want it. If your car spends most of it's time between 2-3k rpm, you don't want it. If your car is a weekend joyride/track toy and you use all of your rpm range, this is right up your alley.

No judgement here, just different strokes for different folks.

Great explanation. Thanks. I just wouldn't want to be stranded if caught in a traffic jam idling. Sounds like no way that would happen.