Has anyone got an underdrive pulley for their 2.2. Where did u get it from, was it a noticable difference? Do you think i will have charging problems, as for electrical its all stock but i do have the 7 speaker system.

 

All of the recent posts said don't do it. Search for that article and read it. Apparently it causes the pulleys to be off balance and can cause damage. Also there are no good gains from it.

 

the pulley on a 2.2 has a balancer in it. do not replace w/ an pulley that does not contain this.

 

thanx for the info

 

z-spec.com they have a lightened billet crank pulley

 

All crankshaft pulleys are dampers to dampen the torsional vibration in the crank. Any rotating part has to be balanced whether it is a billet pulley or the stock damper. The problem with a billet is that it removes all the damping (rubber element) of your mass-elastic system which can potentially cause catostrophic failure to your rotating assembly. Look here for the full explaination:

https://www.cobaltss.net/forums/drivetrain-79/flywheel-45582/