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Is a Underdrive Pulley bad for Sub/Amp?

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Old Jul 12, 2010 | 02:17 PM
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Default Is a Underdrive Pulley bad for Sub/Amp?

i have not installed my u/d pulley yet and was wondering if it is bad for the stereo. not as far as damage wise but i mean will it not charge the alt. enough so that my sub cuts off and on? or could i install a alt overdrive pulley? i dont have any room in my car to wire up a capacitor. and really dont want too. i have a Kicker L7 solo baric 12 inch sub and a Kicker 750.1 amp. the sheet i got with the amp says its a 928rms amp. so what can i do or will i be fine?
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Old Jul 12, 2010 | 02:38 PM
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You'll probably be fine as is. I've got 2 amps in my car with a UD pulley, and have never had any problem. Granted, I don't drive much at night when the headlights would pull current as well. Don't waste your time with a capacitor. Total waste of money.
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Old Jul 12, 2010 | 02:49 PM
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Yeah you should be fine, just do the big 3 to maximize the power from Alt to battery and to amplifiers. Id you do happen to have some issues you can always bump the idle speed up 50 to 100 rpm.
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Old Jul 12, 2010 | 03:24 PM
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what is the big 3?
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Old Jul 15, 2010 | 08:46 PM
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If you have an a4 you may have charging issues. I have it in mine I am actually installing an overdrive alt pulley this weekend. I ended up buying one but my dumbass had one already that came with my March kit!
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Old Jul 15, 2010 | 11:53 PM
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I have an A4, a 25% underdrive crank pulley, a 480W subwoofer amp, a 242W 2 channel amp, and bumped by idle up 100RPM and everything is just fine. I had worse charging with just the pulley and stock idle with the radio off. When I was driving home from work today it was 80+ outside, I had the radio up pretty loud, the cooling fans were on, and my voltage was sitting right below 13V at a stoplight.
Also, where is the 707 do you live. I live in San Jose now but am originally from Vallejo.

Last edited by vjo90rs8; Jul 16, 2010 at 12:44 AM.
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Old Jul 16, 2010 | 11:33 AM
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vj the fact you bumped your idle up 100rpm may help with any charging problems people may have.
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Old Jul 18, 2010 | 05:41 PM
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Originally Posted by vjo90rs8
I have an A4, a 25% underdrive crank pulley, a 480W subwoofer amp, a 242W 2 channel amp, and bumped by idle up 100RPM and everything is just fine. I had worse charging with just the pulley and stock idle with the radio off. When I was driving home from work today it was 80+ outside, I had the radio up pretty loud, the cooling fans were on, and my voltage was sitting right below 13V at a stoplight.
Also, where is the 707 do you live. I live in San Jose now but am originally from Vallejo.
ok thanks for the advice everyone. i should be fine im guessing. and im from dixon vjo90rs8
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