Underdrive Pulley
07-10-2007, 06:14 PM
#1
Underdrive Pulley I've been thinking about getting an Underdrive Pulley, but I have some concerns about it. I remember reading somewhere once a great while back, that putting on a underdriver pulley with a large audio system is bad? I guess the alternator can't handle the load with the engine speed running slower. Any comments to this? I really don't know, I would just like some good clear facts about it, so I can make a smart decision about my mods. Thanks.
07-10-2007, 06:39 PM
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My car does not have any aftermarket stereo, but the underdrive pully works great. I gained 14rwhp/12rwtq with it. No charging issues at all, even with city driving.
07-10-2007, 06:43 PM
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with an aftermarket system there is no way you can run pulleys. Even with the overdrive alt pulley. Either the stereo or pulley but you cant have both..maybe you could get a second battery.
07-10-2007, 06:45 PM
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Originally Posted by johnson7454
with an aftermarket system there is no way you can run pulleys. Even with the overdrive alt pulley. Either the stereo or pulley but you cant have both..maybe you could get a second battery.
07-10-2007, 06:49 PM
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I have 2 amps,2 12's and a cap tube,+25% underdrive pulley.
no probs at all.even idle w/ ac + stereo cranked you just have to set your
idle to 900 in park. (i had to with my stall converter anyway)
the lowest the volts goes is 13-13.2 tap the gas it goes back to 14.2
hope this helps, ken
no probs at all.even idle w/ ac + stereo cranked you just have to set your
idle to 900 in park. (i had to with my stall converter anyway)
the lowest the volts goes is 13-13.2 tap the gas it goes back to 14.2
hope this helps, ken
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07-10-2007, 07:07 PM
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or you could just upgrade the alternator to a high output one that way even at lower speeds it will put out the same as your stock one. But to me it sounds like you have overloaded your system already. from what I hae read you should be using a .5farad capacitor for every 500wattsRMS so if you really are pushing 1500watts then you would need atleast a 1.5farad capacitor
07-10-2007, 07:11 PM
#9
Yea....I haven't put the money into the cap yet lol. Looking at getting a 2 farad because I'm also about to add another amp for my type R speakers I'm putting in the doors. I was thinking high output alternator....It wont cause more parasitic drag? Maybe adding those two things, and then the underdrive pulley will be 100% fine.
07-10-2007, 10:37 PM
#11
Thats why I'm just thinking about scratching the idea of the underdrive pulley. Unless someone has first hand experience doing pretty much what I'm planning on doing....I'm not sure what to do. More than likely I'm not going to do the pulley, just get my new amp, and a damn good cap. Thanks for the help though.
07-10-2007, 11:33 PM
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Originally Posted by davered00ss
My car does not have any aftermarket stereo, but the underdrive pully works great. I gained 14rwhp/12rwtq with it. No charging issues at all, even with city driving.
07-11-2007, 02:14 PM
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I'm running over 1000 watts, have an underdrive pulley, and drive my car everyday. You don't need a cap. They are useless. A decent alternator and upping your idle and you'll be fine.
07-11-2007, 02:16 PM
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Originally Posted by Dal1as
I'm running over 1000 watts, have an underdrive pulley, and drive my car everyday. You don't need a cap. They are useless. A decent alternator and upping your idle and you'll be fine.
07-11-2007, 02:18 PM
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Originally Posted by AznMuscle
I've been thinking about getting an Underdrive Pulley, but I have some concerns about it. I remember reading somewhere once a great while back, that putting on a underdriver pulley with a large audio system is bad? I guess the alternator can't handle the load with the engine speed running slower. Any comments to this? I really don't know, I would just like some good clear facts about it, so I can make a smart decision about my mods. Thanks.
The WS6Store sells them.
07-11-2007, 03:28 PM
#17
So with a larger alternator, I'll get rid of the dimming, and wont have the charging issues I might have with an underdrive pulley? Or use the overdrive alternator pulley, then the underdrive crank pulley...increase my idle and I'll be good?
07-11-2007, 09:29 PM
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Originally Posted by AznMuscle
So with a larger alternator, I'll get rid of the dimming, and wont have the charging issues I might have with an underdrive pulley? Or use the overdrive alternator pulley, then the underdrive crank pulley...increase my idle and I'll be good?
07-12-2007, 05:04 PM
#20
Hmm....I'm kinda thinking about just not worrying about it right now. I don't have the money for all that, and I'm gonna be need tires real real soon....so I have to save for the rims I want as well. But thanks for all the input, when the time comes I'll just get a larger alt, overdrive alt pulley, and the underdrive crank pulley.