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Old 02-15-2001, 01:11 AM   #1
yuusaku
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Member#: 387
Join Date: Oct 1999
Location: Coquitlam, BC, Canada
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2000 Impreza 2.5RS
Aspen White

Question difference between UOR pulley(smaller diameter) and "N1" pulley?

con's??
pro's???
http://www.autocaresubaru.com/tuning.html
for more details of these two pulleys.


thanx
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Old 02-15-2001, 09:41 AM   #2
GTBGUY
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'98 QS Legacy L (auto)

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Pro's for both pulley's is that they both reduce the rotational mass of your drivetrain (hence allowing to loose less power to friction and power to rotate the drivetrain). Big plus for the lightweight reg. sized pulley is that you won't decrease the effective amperage from your alternator, hence no "light dimming @ idle". Downside is that if your after ultimate performance, the UnderDrive will allow for even less powerloss by the drivetrain. Coupled with light weight flywheel, your car will be free to rev... almost like a DOHC VTEC!
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Old 02-15-2001, 11:33 AM   #3
HamFist
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I have the stock dia. pulley with a few other mods. It definitely made a difference on my N/A car. It pulls from 60-80 pretty effortlessly. The motor sounds a touch different, too, but not much. Get an intake and fuel pump to see the biggest differences on a stock car.

Gary
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Old 02-15-2001, 01:19 PM   #4
yuusaku
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GTBGUY and burninrubber,

so both of you have the N1 pulley..
not UOR??

where did you get them?
isr???jc???
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Old 02-15-2001, 01:34 PM   #5
GTBGUY
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yuusaku - I have the UD on my '98 Legacy L, and the Lightened stock size pulley on my '99 Legact GT. You can get them from JC Sports (where I got mine) or iSR.
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Old 02-15-2001, 02:21 PM   #6
gnurider
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Unhappy

Im kind of in the same boat too, i want to get a pulley but a short shifter sounds like fun also. Was thinkin about the deal that JC Sports has, btw would i have to purchase some belts or all i have to do is swpa the pulley?

jt

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Old 02-15-2001, 02:21 PM   #7
gnurider
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Talking

I spelled swap wrong....;p
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Old 02-15-2001, 02:35 PM   #8
GTBGUY
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The UD pulley requires new belts (not stock size). The lightened pulley uses the stock size belts (but I changed these out for new ones).
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Old 02-15-2001, 06:37 PM   #9
Brahmzy
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Have fun installing it!!!! hehe. The crank bolt is a b i t c h to get off!!! (of course it'd probably help if I wasn't trying to install the thing in 35 degree snow weather)
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Old 02-15-2001, 07:41 PM   #10
Leonardo
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To bad I can't edit here either!

Leo
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Old 02-15-2001, 10:03 PM   #11
ImprezaRS dot com
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I have the normal size N1 pulley, and there was a noticable improvement after it went on, even with already having a 12lb flywheel and turbo.

The best part of it is that 85% of the gains from a pulley come from weight loss, and I can still use the stock belts.

Larry www.ImprezaRS.com
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Old 02-16-2001, 09:37 AM   #12
gtguy
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So, it sounds like there isn't much difference in performance gains between the two, so all things considered, the N1 is the way to go? (if I understand all this correctly).

I'm entering the home stretch in Mod Fest, and while I am leery about an underdrive, a stock-sized pulley makes sense to me.

Can someone characterize the driving differences between the stock and N1 pulley setups? I'd like something a bit more descriptive than "freer revving." Like, does the butt dyno feel it, working the throttle, what happens, yada, yada.

Kevin
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