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does anyone have a lightened crank pulley on their r53?
I would like to talk to someone local, and perhaps check out their car, with 15% SC pulley and the lightened crank pulley. I have the 15% and want to see if the crank pulley is worth it. thanks
I would like to talk to someone local, and perhaps check out their car, with 15% SC pulley and the lightened crank pulley. I have the 15% and want to see if the crank pulley is worth it. thanks
Honestly - is it worth it for maybe 2% - no one is willing to prove it is an issue and any vendor selling one will tell you it is safe. IMO if you want the gain why not just replace your 15% pulley with a 17% pulley. The gains will be almost identical and the 17% pulley is known to be safe.
Yes, I have a 2% larger lightened pulley on my crank w/ a 16% smaller pulley on my SC. The combination ratio results approx. 18.25%. I was trying to avoid the 19% pulley "belt-throw-off" issue but get as close as I could via this combination.
A second benefit is the reduced weight allowing for quicker acceleration w/o changing to a lighter flywheel. (note '05 & new have a much lighter stock pulley than '02 - '04 models).
I personally do not buy into the shattered oil pump gears due to removing the crank dampner theory. The belt in itself is a dampening source capable of absorbing an amount of shock. If (made w/ pressed powdered metal) oil pump gears explode from remote undampened vibration, then you may have simply had a bad gear. No one has shattered a crankshaft yet. Even the slightest engine vibration will blurr a windshield suspended rearview mirror. My mirror is never blurred, even at redlined rpm.
In a past life I was a Licensed Mfgr of High Speed Pulleys for Gates Rubber Co. & held 8 patent licenses under Gates to produce their pulleys / sprockets / sheaves for their belt division. We were Gates' only authorized source for high-speed & high-accuracy power transmission drives. The fastest (cog / toothed) belt in use anywhere that I know of we manufactured pulleys for for over 10 years. See http://www.powerdyne.com/silentdr.htm The Powerdyne Silent drive had a output shaft/sprocket rpm of 40,000 max to drive the centrifugal impeller at peak effectivity. No lubrication, no wear, no noise (vibration = noise = gear error).
We also had our own line of Lightened Pulleys for Subaru's & S2000 Honda's. The Subie crowd was divided into 2 groups, those who expected every other crankshaft would be breaking in half & those who used them which never ever saw one fail.
Binging this thread back to life, I replaced an original '03 R53 HEAVY crank pulley with a Mini Mania crank. The weight diff is night and day. 6 pounds versus 1/3 pound, or something like that. The car absolutely revs quicker.
No other mods, just that crank pulley. However before you do any other mod to your car, absolutely have your by-pass valve checked. If you have over 40,000 just replace it. It's not expensive and you will assure yourself that you are getting all your boost from the supercharger.
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