when i bought my car it had underdrive pullys on it...dont know what kind...i was just wondering what aftermarket ones did for the car

 

Underdrive pullys slow the rpms of your acc. Therefore taking less power and putting more to the ground. The reduced speed of the acc. can cause charging problems though.

 

Post a photo and we can tell you which manufacturer made them. Steedas are most common.

Charging problems? Maybe 1 out of 1,000 has that issue and it's usually because they have a 9 billion watt stereo or something that draws a lot of power. Personally, I've had my Steeda UDPs for well over a year without any issues.

 

realistically did you notice a gain from them though ?

 

yeah. . . I havent had any problems with my UDP and no one else i've ever talked said they have had problems with theirs charging. BUt i have a $250 optima yellow top deep cycle so i never really have any starting problems

 

did you guys feel any power increase after you got them?

 

Yep. They are typically good for 5-8 rwhp and help gas mileage if anyone cares. I added the timing adjuster from steeda later. Between the CAI, UDPs, and TA, my city mileage jumped from 17.5 to 20.5 average and two weeks ago I eeked out 30 mpg highway crusing at 65ish.

The only thing about pulleys is if you add a S/C later, you'll have to revert to stock pulleys on the crank and water pump. The alt pulley you can keep on.

 

any over heating issues with slowing down the water pump???

 

When I was running them, I had zero cooling or charging issues.

 

no problem with my steeda udp setup