Perrin light wieght pulley

[tofurun]

Originally Posted by fumanchu1

have them on my car atm no issues to report, have had them for 15k kilometers

Thanks you. Are you running just the crank or all 3 ?

[Tcoat]

Originally Posted by tofurun

The Dyno is not that big a deal to me with this part. Everyone says the rpm hits up faster and Perrin claims it to be like shedding 100lbs off your car. That's directly in the product description. Now if they have proof of this claim idk. I am excited though for the chance to pop my gas and have a little more response for rev matching .

Well it sounds like you have researched but I am afraid you are just going to get the same split decision here that you have everyplace else. Those that like them will say they do wonderful things. Those that don't will say they are crap. I have never tried them but based upon the objective evidence I have seen (remember I rule out the questionable dynos) I don't think they do what people claim.
There is something to be said about the psychological aspect of the placebo effect though so if people think it makes the car better then the car is indeed better to them.

[tofurun]

Originally Posted by Tcoat

Well it sounds like you have researched but I am afraid you are just going to get the same split decision here that you have everyplace else. Those that like them will say they do wonderful things. Those that don't will say they are crap. I have never tried them but based upon the objective evidence I have seen (remember I rule out the questionable dynos) I don't think they do what people claim.
There is something to be said about the psychological aspect of the placebo effect though so if people think it makes the car better then the car is indeed better to them.

That's funny because I was just thinking about the placebo affect on that last response when I wrote it. I ordered it last night because I got a hell of a deal. Guess I'll be just another test dummy. The absolute only argument I can understand for not doing it on this car would be because it's a high revving engine. Most all arguments include that the problems are from shifting a rev limiter for instance in the Wrx. High miles with high revs over time seem to be the only valid explanation for failures with them. With this car being high revving engine it's almost like a catch 22 lol.

[OkieSnuffBox]

Originally Posted by Summerwolf

Yes, I know the difference. 99.9% of "dyno" results for the lightweight pullies either show minimal gains within tolerance of a dyno or they're inconclusive, or better yet done by people who want to sell their product. The biggest benefit people see from this are the "feels like it revs faster" benefit.

I'm well aware chief. That's my point. A lightweight crank pulley is almost a "bro" mod as shifter knobs and interior wraps.

http://www.ft86club.com/forums/showthread.php?p=2379089

[Summerwolf]

Originally Posted by OkieSnuffBox

I'm well aware chief. That's my point. A lightweight crank pulley is almost a "bro" mod as shifter knobs and interior wraps.

http://www.ft86club.com/forums/showthread.php?p=2379089

Well played..... well played.

[fumanchu1]

Originally Posted by tofurun

Thanks you. Are you running just the crank or all 3 ?

I'd have to recheck to make 100 sure (so many things everywhere on that car lol) but I believe all 3. I mean they shave a bit of weight that's all one could objectively say lol (can't speak to the revving as im sc'd)

[fumanchu1]

Originally Posted by OkieSnuffBox

I'm well aware chief. That's my point. A lightweight crank pulley is almost a "bro" mod as shifter knobs and interior wraps.

http://www.ft86club.com/forums/showthread.php?p=2379089

I like to be 10lbs lighter sue me :P don't know how many weight they do shed but wtv they are on so they are staying lol

[tofurun]

Originally Posted by fumanchu1

I like to be 10lbs lighter sue me :P don't know how many weight they do shed but wtv they are on so they are staying lol

3.7 lbs wieght loss on the crank pulley if it's Perrin

[tofurun]

Originally Posted by fumanchu1

I'd have to recheck to make 100 sure (so many things everywhere on that car lol) but I believe all 3. I mean they shave a bit of weight that's all one could objectively say lol (can't speak to the revving as im sc'd)

I know I read on one of the super charger kits you can't run the light wieght pulleys.... No clue which one it was

[Cole]

If you want to drop money on it, then go for it. But it'll be 100% placebo. And, if something does happen to your engine and you're under warranty, good luck getting covered if you have a LWCP

[tofurun]

Originally Posted by Cole

If you want to drop money on it, then go for it. But it'll be 100% placebo. And, if something does happen to your engine and you're under warranty, good luck getting covered if you have a LWCP

I got a stack of parts ordered and on back order.... 17k miles and I don't think I could ask for warranty work if I was the dang service manager lol

[justatroll]

Since Tcoat would be disappointed if I didn't check in,
Some simple facts:

1 - The stock crank pulley IS a torsional damper. It is a textbook example of one and testing by a member on this forum shows that it absorbs engine harmonics better than a billet crank pulley. Whether or not the engineers put it on the engine because the engine NEEDS it or not is up for debate.

2 - The stock pulley cost more to install as OEM than a Billet Al. pulley.

3 - Shedding weight from anywhere else on the car will give the same advantage as shedding the weight from the pulley (as far as a human can FEEL). Removing the weight from the spare tire or taking 1/2 gallon of gas out of the tank will make just as much of a difference. (can you FEEL the difference between 12 and 12-1/2 gallons of gas? No, then you wont feel the difference of your LWCP except in elevated engine NVH)

4 - If you feel the need to shed rotational inertia from the rotating assembly (for whatever reason you feel is beneficial) the pulley makes the LEAST difference of any component. Shedding GRAMS from the drive belt would make as much of a difference. Changing the pressure plate bolts from steel to titanium would make a BIGGER difference)
Finally my favorite:

5 - Shedding rotational mass from the rotating assembly will NOT give the engine more horsepower. It is simple physics.

6 - a lightened rotating assembly WILL be noticeable in rev rates when the engine is out of gear.


There now - Flame ON!
Disclaimer - I AM an engineer, so lets just get that out of the way so that everyone can tell me that I don't know what the fuck I am talking about. Engineers seem to get told that more than anyone else on these forums. If a fireman tells you how to put-out a fire they get thanks. If a member of the armed forces talks about anything, they get a "thank you for your service". If an engineer states that they are an engineer they immediately get shit on even if they are regurgitating facts.

[Captain Snooze]

Déjà vu

[justatroll]

Originally Posted by Captain Snooze

Déjà vu

Deja Stu?