Which lightweight crank pulley?
 

I am in the market for a standard sized lightweight crank pulley and I'm having a hard time deciding which to get between the unorthodox, stillen and ams pulleys. I don't want to go underdriven but might entertain the idea.

Please give me your personal experiences and feedback and help me decide. Also I seem to remember hearing about some bad installs on the stillen pulleys due to the installation being somewhat different. Any truth?

I had AMS (all 3) on my 350Z with no issues what so ever so about 70k! they were excellent quality. I also know of a few others than ran just the crank UR and had no issues. I'm reluctant to buy stillen altogether, just because of all the stuff i have heard over the years, but i would think its hard to mess up a pulley. On the 370Z am going AMS needless to say, my next choice would be UR and lastly, stillen. Good Luck man

NST Is another option: http://www.the370z.com/engine-drivet...no-charts.html

I've had Stillens underdrive on now over a year now with no issues.
Had considered the lightweight, but gains were minimal at best.

The issues with the pulley's isn't the design, it is the installation. Pulley's have developed wobbles because installers didn't understand the instructions, such as failing to tighten an additional 90 degrees after torquing to spec.

another thing to consider, the stock Crank weight is 4.5lbs i believe...the AMS is 1.45lbs and the UR is 1.07

Changed my mind, going with UR

Thanks for the replies. I think the UR is winning out on the decision.

I have both Pullies. Stillen Crank and Under Drive. Was given to me by a friend. But skeptical about installing these units. Think I'm going to install the main crank for now. I dunno about changing belts and going with the UR Pullie.