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Old 05-23-2004, 02:56 PM   #1
STi-Nismo Dood
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Default UR underdrive pulley on AFI phase-I motor issues

Hello,

I bought an Unorthodox under-drive pulley 2 years ago and still have not installed it. My AFI system consists of APEX electronic piggy backs to control my turbo. I have heard that underdrive pulleys may not have the correct harmonic balancers and I am worried I will damage my engine because I installed this (also lesser power to accessories). Has anyone actually known people who have installed an underdrive pulley on their AFI and created problems? I may consider selling the underdrive and get a lightweight perrin if this is really the case for my phase-I DOHC motor. Thanks.

-Vic
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Old 05-23-2004, 03:27 PM   #2
Wedge
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Don't bother with an underdrive pulley, and instead get yourself a lightweight flywheel.
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Old 05-23-2004, 03:34 PM   #3
STi-Nismo Dood
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Whats the deal with the UR underdrive pulley for us phase-I motors? Also, my APEX piggybacks seem to be drawing a lot of power already with the OE crank pulley. This OE crank pulley is 10 years old and I notice it getting wobbly on occasions so I really need to fix this...

I already have the exedy lw flywheel, its just that I don't want my UR pulley to be laying around for another year, might as well use/trade/sell it.
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Old 05-23-2004, 03:41 PM   #4
Wedge
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I've heard it's a bad idea to use a lightweight flywheel in combination with an underdrive pulley, something about throwing the crank out of balance.
So I decided to keep just the flywheel.
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Old 05-23-2004, 04:20 PM   #5
Kostamojen
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All the talk about underdrive pulleys plus lightweight flywheels is pure heresay. There are several people with Subarus on these boards using that combination for years.
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Old 05-23-2004, 07:49 PM   #6
Wedge
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Well then, there you go!
If you got it, go for it, I won't be getting one again tho.
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Old 05-23-2004, 07:55 PM   #7
White 2.5rs
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there was also an article <from an experienced tuner, iirc> that said he had a LW FW and a normal pully or vice versa nad blew the engine because of the difference in rotational mass/vibration
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Old 05-23-2004, 09:31 PM   #8
leondal
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I have run the UR underdrive pulley for two years and 30,000 miles with no problems whatsoever...
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