Lightweight crank pulley

[xwd]

Never heard of a Subaru motor failing due to a lightweight crank pulley and I've been around for some time now. I ran one for 90K miles on my 2002 WRX, with about 60K of that above 300WHP.

I think it's a worthwhile modification.

[MightyMeeple]

Don't cross the streams!!!!

[dave77]

If you can afford it, I recommend the CF DS. It will make your shifts even smoother.

Originally Posted by Xinshadow

I have the Perrin on mine, I've put on 5k miles so far with -5F temps the last week, zero issues. I want to stay NA so I looked at the pulley as part of a larger rotational mass diet including an aluminum driveshaft, aluminum flywheel and a set of rFP1s as well. So far I just have the pulley, Perrin drop in and nameless op/dp catted combo on the car, pulley has made the biggest difference by far. Definitely a good bang for your buck mod, and it makes hard shifts smoother as well.

[350matt]

If a damper is fitted then don't fit a lightweight plain pulley

its as simple as that
one point to consider is that what tends to happen with crank torsional vibration is that its transmitted up the valvetrain to produce valve control issues - which then limits power at least and breaks parts at worst

so if you're intending to fit a hairy cam at some point the last thing you want is a valvetrain thats already on the limit

[wootwoot]

"If a damper is fitted then don't fit a lightweight plain pulley

its as simple as that
one point to consider is that what tends to happen with crank torsional vibration is that its transmitted up the valvetrain to produce valve control issues - which then limits power at least and breaks parts at worst

so if you're intending to fit a hairy cam at some point the last thing you want is a valvetrain thats already on the limit"


"Never heard of a Subaru motor failing due to a lightweight crank pulley and I've been around for some time now. I ran one for 90K miles on my 2002 WRX, with about 60K of that above 300WHP.

I think it's a worthwhile modification."

These two quotes define the two sides of the argument well.

[Kuri]

Hmmm I'm about to pick up a perrin pulley from someone


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[OICU812]

Even with a legit statement from Subaru themselves people still show paranoia? Lol reason the pulley we have is on there is simply cause they probably had 10,000 + in a parts bin...

When in doubt re read post #9, please drive thru.

[tennisfreak]

Even with the statement from Subaru there are those who feel compelled to tell us it is wrong, don't do it, and subtly imply you're stupid if you do it.

[DAN_BRZ]

I think my lower perrin pulley is great. Car def revs freer. The only thing I regret with this pulley is that I didn't buy a complete kit pulley kit like the raceseng kit but it also wasn't released yet. the perrin pulley is great quality like all the products they make and have had zero issues yet but I've only driven my car for 9k and she's away for the winter. If u do go with this mod be careful of the o-ring when reinstalling the new pulley. If not seated properly it will leaked oil. I didn't have this issue but there are some ppl that have.

[wootwoot]

Lol.... Like I said: If you dig deep enough you can find engine blue prints that say the part is a harmonic dampener. I spent a few days trying to figure this out a while back. It's funny that the part in question is built exactly like every other OEM harmonic dampener on earth yet the letter in question says it's not one (from a customer service rep no less). Proponents of LW pulleys say they are just a cheap cast part built for cost savings. The other side of the argument is if they are really just a way to cut cost then why do the auto and manual FRS have different crank pulley's? Wouldn't it save more money to use the same pulley? Seeing as how they are just pulleys and all...Same is true of the WRX and STI. Different pulleys.

To clear the air I actually have a pulley for my car *not installed yet*! I am just trying to point out the debate goes beyond the letter from Subaru and the decision to modify this part of your vehicle should not be taken lightly. Those who make the claim that a one pice aluminum pulley is a bad idea have their opinions and are not stupid for holding them.

[Calum]

Originally Posted by wootwoot

Lol.... Like I said: If you dig deep enough you can find engine blue prints that say the part is a harmonic dampener. I spent a few days trying to figure this out a while back. It's funny that the part in question is built exactly like every other OEM harmonic dampener on earth yet the letter in question says it's not one (from a customer service rep no less). Proponents of LW pulleys say they are just a cheap cast part built for cost savings. The other side of the argument is if they are really just a way to cut cost then why do the auto and manual FRS have different crank pulley's? Wouldn't it save more money to use the same pulley? Seeing as how they are just pulleys and all...Same is true of the WRX and STI. Different pulleys.

To clear the air I actually have a pulley for my car! I am just trying to point out the debate goes beyond the letter from Subaru and the decision to modify this part of your vehicle should not be taken lightly. Those who make the claim that a one pice aluminum pulley is a bad idea have their opinions and are not stupid for holding them.

I just wanted to add that the stock pulley has a rubber isolator between the inner and outer portions of the pulley. Which to me is more evidence that the pulley is more then just a cheap cast part.

[wootwoot]

Originally Posted by Calum

I just wanted to add that the stock pulley has a rubber isolator between the inner and outer portions of the pulley. Which to me is more evidence that the pulley is more then just a cheap cast part.

Exactly what I was saying. It is build exactly like a harmonic dampener yet people maintain it is not. Just saying.....

[Fast_Freddy]

The oem crank pulley is indeed a harmonic balancer and there should be no question about it. The only legitimate question is how great the risk is when replacing it with a lightweight AL pulley.


I'm currently running a Perrin LW crank pulley with no worries.

[ramiram1984]

Originally Posted by Fast_Freddy

The oem crank pulley is indeed a harmonic balancer and there should be no question about it. The only legitimate question is how great the risk is when replacing it with a lightweight AL pulley.


I'm currently running a Perrin LW crank pulley with no worries.

How about running Perrin pulley put in with supercharger and no issues...
That should say something.