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Old 04-27-2002, 04:23 PM   #1
Dr Ken
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Default Pulley install: opinion

Okay, after weighing things up, I decided to proceed to self-install N1 three-pulley kit ($260). I buy some big tools to get those beefy pully nuts loosened ($20). In trying to muscle the nuts loose, I crack the alternator housing (the ol' metal-rod-to-keep-the-alternator-from-turning trick). This is not a huge deal, as its overall integrity is still adequate. But having failed to get the alternator or the cam loosened (with a 17" breaker bar), I went to the Subie dealer to have it done for $140 (2 hr labor !?!, proly not the cheapest option). Overall cost : $420 with a free breaker bar and cracked alternator.

The performace is a teeny bit more perky, but not nearly as much as aftermarket intake and exhaust.

Overall impression: Marginal value. I may have felt better if the process wasn't so clumsy. I may have felt better directing funds to a save an endangered species, or something...

Ken
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Old 04-27-2002, 05:12 PM   #2
jetfan8178
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I just this upgrade as well.I found a much greater difference and my gas mileage improved.

Did you reset the ECU?

On the install side,For a alternator you really need a impact gun to loosen that bolt.I don't remember the exact reason but I remember that using a wrench can damage the alternator.
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Old 04-27-2002, 05:52 PM   #3
Dr Ken
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granted, I didn't reset ECU, thinking it not necissary. Do you really think I should ...?
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Old 04-27-2002, 06:10 PM   #4
jetfan8178
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YES!!

Very important.You removed alot of drag from the engine.You removed alot of drag from the engine and thus it has less of a load.It needs to learn to run with these settings.
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Old 04-27-2002, 08:29 PM   #5
RawCode
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When we loosened our Alternator pully we jammed 4 or 5 screwdrivers into the alt to help distribute the load and it worked great...

RawCode
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Old 04-27-2002, 10:00 PM   #6
Josico
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Quote:
Originally posted by jetfan8178
YES!!

Very important.You removed alot of drag from the engine.You removed alot of drag from the engine and thus it has less of a load.It needs to learn to run with these settings.
hmm i thought the ecu still learns... just slower?... i havn't reset and has been for a couple of months... still think i should?.. hmm
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Old 04-28-2002, 12:44 AM   #7
RawCode
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Does the ECU use mass as a factor with its spark advance? I didn't think it would simply because it has nothing to do. It is just less weight which makes the engine more efficient.

RawCode
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Old 04-28-2002, 11:35 AM   #8
RIwrx
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Default Re: Pulley install: opinion

Quote:
Originally posted by Dr Ken

Overall impression: Marginal value. I may have felt better if the process wasn't so clumsy. I may have felt better directing funds to a save an endangered species, or something...

Ken
i actually think more highly of the value of putting in an a pulley. an easy mod, and the feel in revving is quite noticeable (less drag). on a relative scale, i.e., putting in a pulley vs. putting in an uppie or changing exhaust- perhaps doing the pulley is farther down the list (in terms of cost v gain). can't speak for exhaust personally, since i've yet to do it.

that said... i'll put in a plug for and recommend the underdrive crank pulley- (i've unorthodox).

oh, and ken- "I may have felt better directing funds to a save an endangered species, or something..." lol- so i take it you aren't going the turboback route? am eventually gonna go turboback, although birds chirping and seeing L.A. smog (nothing like it!)makes the guilt settle well.
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Old 04-28-2002, 11:37 AM   #9
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oops- i just realize i posted in the NA forum.

that said, that may explain the diff between your experience/afterthoughts and mine, w/ that mod.
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Old 04-28-2002, 12:09 PM   #10
jetfan8178
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Quote:
Originally posted by RawCode
Does the ECU use mass as a factor with its spark advance? I didn't think it would simply because it has nothing to do. It is just less weight which makes the engine more efficient.

RawCode
From what I know of engine tuning,anytime you modify spark,intake,exhaust,fuel,or amount of drag on engine you need to retune.I wopuld say starting from basline by resetting the ecu would be the best because it would take the stock settings and adjust from there instead of it trying to figure out why there is less drag all of a sudden.
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Old 04-28-2002, 08:48 PM   #11
RawCode
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True true...

Be kinda weird if the ECU found less drag, then assumed that it lost AWD or a piston or something

RawCode
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Old 04-29-2002, 12:33 AM   #12
Dr Ken
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Feww, what a wierd day.... sunshine.

Well, I've been thinking, while trying not to feel like a whimp in failing to change my own pulleys . I've decided that the ECU has no interest in inertial character, as this does not affect either A/F mixture nor timing. But I went ahead and reset it anyway. I can say that things are more peppy than before... generally feeling better about the whole thing.

Ken
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