kickintheglass

Having to replace the serpentine belt soon, I figured that I might as well replace the tensioner while I'm at it. Then I got to thinking - should I also swap out the OEM crank pulley for a lightweight pulley? I've researched numerous threads across various forums, and much of the advice has come from people who have not even done the mod yet.

The consensus is usually the same across the board:
1. Most cars have harmonic dampeners to increase the longevity of your engine/crankshaft.
2. Underdrive pulleys (not OEM size) will cause issues with your accessories.
3. Any mod to increase engine performance is typically a trade-off for driveability (wear and tear).

That being said, does anyone have long-term experience with lightweight crank pulleys? My top options right now are the pulleys made by Unorthodox Racing and Stillen.

Surfnazi

Not really worth it in the end

FSTG37

I have a Unorthodox pulley on my G37 Sedan for over a year now with no problems. I also have a JWT lightweight flywheel and stage 2 clutch. 1st and 2nd gear are quick.