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Originally Posted by Boxtaboy
Ok, forgive my ignorance here, but when Jake says about the only negative effect is low charge capacity at idle if all the accessories are on as well as the headlights, does that mean your battery drains on you if you're stuck in traffic idling for a long time?
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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.