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Old 12-08-2000, 11:47 AM   #1
Scooby Specialist
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Join Date: Sep 2000
Location: Las Vegas, NV
'98 Impreza L Wagon
'90 Talon TSi AWD

Post Loss of power with Unorthodox pulley

I plan on having 3 amps (2 for speakers, 1 for subs) with a 1.0farad cap for them. I'd like to get an Unorthodox racing underdrive pulley, but wanted to know how badly will it affect the increased load on the bettery because of the amps?
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Old 12-08-2000, 11:49 AM   #2
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Location: San Antonio, TX
2001 Arctic White
Camaro SS #1800


get a high output alternator. You will lose power with the puley.
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Old 12-09-2000, 12:56 AM   #3
Aaron'z 2.5RS
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'00 RS/WRX Stg5
'98 RS Stock


Spinning the alt slower will decrease it's current output, the faster it spins the more current produced.

Power pullies gain you power by spinning things slower, you shouldn't worry too much about it with the system outlined. You may get dimming headlights at stop-lights.

Note: the power you have gained by adding the pully is lost by the extra weight of your system.

I have always failed to see pullies as helping out anything.

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Old 12-08-2000, 01:22 PM   #4
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2011 Grand Cherokee
Triumph Street Triple R


Get the JC Sports pulley.
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Old 12-09-2000, 07:45 AM   #5
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Thumbs up

"I have always failed to see pullies as helping out anything.


Ah...I think their lighter weight results in noticeably quicker revving...$.02 of pulley user.

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Old 12-09-2000, 09:12 AM   #6
Jesta C
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Location: Austin, TX USA
2001 Lexus IS300
Blue, '02 manual on order


fellfrosch, I have a punch 400 and 800 running in my prez and receive no power problems at all, the pully is from cobb tunning and I am not sure what kind it is.. If you run atleast a 4 gauge wire, witch you should, you won't have any problems...
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Old 12-12-2000, 10:53 AM   #7
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Location: Rohnert Park, CA
2001 2.5 RS Sedan


there is a high alternator option for the impreza?
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Old 12-13-2000, 12:15 AM   #8
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2005 OBS 3.0R
'12 SantaFe


I believe someone installed a '92-'95 SVX alternator on their car. I forget who it was.
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Old 12-13-2000, 12:44 AM   #9
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1998 Impreza RS
Brilliant Red


Yeah.. it was a 91'-95 SVX alt into a early 90's Impreza L. He did mention that the voltage output was higher tho... somewhere arounf 15.5volts. (Which my Alpine V12 amps will take full advantage of... bwuhahahahahaha)

[This message has been edited by Chuck (edited December 12, 2000).]
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Old 12-13-2000, 04:27 PM   #10
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Location: Boulder, CO
2000 2.5 RS
Blue Ridge Pearl


Man, you guys dont have any problems with your pullies. My STOCK pulley system already has light dimming with my system.And it is supposed to be even worse with a pully.Why are subaru's alternators so weak. btw, i am running 4 gauge wire to a Precison power, power class amp.400 watts at 4ohms.
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Old 12-24-2000, 01:04 PM   #11
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2000 S201 #78, '95 L
'13 F150 Ecoboost


It all depends on your set up. I have two high power amps (125x2 for front, 1x400 for subs) and an underdrive pulley and I haven't notice any dimmming or power loss.
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Old 12-24-2000, 10:09 PM   #12
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Location: The Hamptons NY usa
99 impreza RS


Ohio Generator Makes A 165amp Altornator That is 2lb liter the your stock Alt ( if that matters to u ). I have one, just put a pulley in, idle at 12.2 with my system on (2 P/G ZX 600 & a 475) & no lights diming. But the Alt. did cost $800 Clams!
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