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Old 01-23-2008, 01:22 PM   #1
Mikeye
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Default Lightweight pulley on automatic transmission? Worth it?

Just wondering if I would feel a difference with a LW crank pulley?

Keep in mind my car is automatic.
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Old 01-23-2008, 07:12 PM   #2
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Mass is mass, mon.

Yes.
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Old 01-23-2008, 07:26 PM   #3
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no matter if its an auto or manual it will make a difference but not a huge amount
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Old 01-23-2008, 07:28 PM   #4
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I have one in my leggy.

It feels smoother and seems rev up faster from acceleration

it could be just me
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Old 01-24-2008, 02:54 PM   #5
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Quote:
Originally Posted by subaru_terrence View Post
it could be just me
Thats the problem...a lot of owners say they really don't notice much if any difference at all.

Could be just psychological...
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Old 01-24-2008, 05:22 PM   #6
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The logic behind it would say that yes, its would help you to rev up faster because you are trying to spin less mass. but once you have it spinning it will take more energy to keep it going like that. not sure if you would notice that but i think you would notice it rev up faster.
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Old 01-24-2008, 05:30 PM   #7
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it revs up faster...it drops faster too

I think it is the same concept...I am not sure if it's because of my exhaust or it supposed to be like that...

let say if i rev up from 1000rpm to 2000rpm...it goes up really fast but in terms of power or acceleration... I dont notice too much of it
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Old 01-24-2008, 06:50 PM   #8
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Weighted items attached to the engine, like the flywheel and pulley, only enhance acceleration in any measurable form in first and second gears, where the gearing advantage helps out.

I've read a few links that have been referred to, back when underdrive/lightweight pulleys were still being argued over, and the actual mechanical benefits are slight, but they are there.

I did have an underdriven, lightweight pulley, but opted to get a non-underdriven, lightweight one when I was having my cams, flywheel and clutch put in. I need all the help I can get with the electrical system in the winter
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Old 01-25-2008, 09:26 AM   #9
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I installed one and it seemed to get the car to rev quicker.
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Old 01-25-2008, 09:31 AM   #10
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I'd consider it a waste with an automatic transmission.

Mass is mass, sure, but it's all taken from such a small moment of inertia... It's a very small piece of what the engine has to wind up, and after first gear, it gets lost exponentially DLC, I don't think I'd even give it credit for being there in second gear - it is dwarfed by the equivalent mass of the drivetrain on the other side of the transmission.

If it has merit, it's with rev matching with a manual transmission when shifting. For overall acceleration, I think you're barking up the wrong tree.
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Old 01-25-2008, 10:04 AM   #11
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^^ so a lighter flywheel is better (bang for buck), but not really possible on an automatic transmission.

Which means that reducing the rotating mass at any other point (save for a lightweight driveshaft) is going to be better than leaving it stock.

The group buy on Group A lightweight pullies is sounding pretty good about now.
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Old 01-25-2008, 03:27 PM   #12
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Pulley is the only choice you really have with an automatic car. Short of breaking open the shortblock and knife-edging the crankshaft and getting lighter weight parts in the rotating assembly.

I don't understand what everyone's arguing over an $80 part in the first place...
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Old 01-26-2008, 05:05 AM   #13
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By the way can we use the lightweight pulley intended for the GT to our NA legacy's?
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Old 01-27-2008, 02:41 PM   #14
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AFAIK, all Subaru H4 pulleys are identical, so yes.
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Old 01-28-2008, 02:04 AM   #15
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Quote:
Originally Posted by DLC View Post
AFAIK, all Subaru H4 pulleys are identical, so yes.
Thanks.
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Old 01-30-2008, 01:41 PM   #16
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I'd say go for it! I had two legacy's with this mod, and it did infact make a positive difference. NOT a huge difference, but for the cash and compared to other options, its a good bang for the buck mod.

I have a PRO ECM Chip forsale that will fit your car if you're looking for more power.
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Old 01-30-2008, 11:39 PM   #17
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Quote:
Originally Posted by 98_soobie View Post
I'd say go for it! I had two legacy's with this mod, and it did infact make a positive difference. NOT a huge difference, but for the cash and compared to other options, its a good bang for the buck mod.

I have a PRO ECM Chip forsale that will fit your car if you're looking for more power.

May I ask if it can be fitted also into EJ252 engine?
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Old 01-31-2008, 07:51 AM   #18
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Quote:
Originally Posted by wanbol View Post
May I ask if it can be fitted also into EJ252 engine?
I'm unsure, I am sure that it works fine with the 2.5DOHC motors. I'd check PROECM.com if that site is still up. search around nasioc too, theres lots of info on the chip.
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Old 02-01-2008, 10:27 AM   #19
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Quote:
Originally Posted by 98_soobie View Post
I'm unsure, I am sure that it works fine with the 2.5DOHC motors. I'd check PROECM.com if that site is still up. search around nasioc too, theres lots of info on the chip.

Mine is the 2.5SOHC engine...
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Old 02-01-2008, 12:24 PM   #20
hott92lude
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I put one on my car, it revs from 4500-6500 faster and revs back down faster. it also did improve My 100-115mph time (did a before and after test)
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Old 02-01-2008, 07:10 PM   #21
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lightwieght pulleys are probably the best simple mod you can do.
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Old 02-02-2008, 05:09 AM   #22
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i have one on my automatic 2000 outback and i noticed a real difference. it doesn't "add"? HP and TRQ. it makes better use of the power already in the engine. it does rev faster, though. in felt it in 1st gear and it is easier to get doing at higher speeds, 80MPH+. i got it after the intake, so i can't say what it would feel like if it was the 1st mod. each mod after that helped in the mix, working together to make the car come alive. my total mods are weapon-r intake, the perrin pulley, stromung catback, and a buddy club voltage stabilizer/grounding kit. automatics are generally faster than manuals, moreso when setup right. i am on cardomain.com under the same name if anyone else has questions. hope this helps
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Old 08-03-2016, 03:11 AM   #23
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What are the dangers of a light weight pulley on say a 05 OBS with AT
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Old 08-24-2016, 12:59 PM   #24
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none.
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