Does any one know what all is ran off of the crank pulley? Air conditioner, Alternator and anything else? I saw a picture of the 2.2 and it looked like there was only air conditioner and alternator. No smog pump, water pump? Is the water pump direct drive?

Reason I am asking is I will probably put an underdrive pulley on soon and what to know what all it will effect.
Thanks, Curly

 

pretty sure just alternator and AC. water is electric i presume and so is PS.

 

Yep, just the A/C and alternator. Water pump is chain driven off the crankshaft.

Heads up.... The only thing that light pulleys will make go faster is your path to poverty.

They are a borderline scam.

 

If it only runs the A/C and the alternator then it definatly reduces the gains possible and the value of the system.
On some vehicles that have a lot running off of the crank and underdrive pulley can be a help.

 

i plan on replacing my crank pulley as soon as mdhhr finishes his for production

 

Does the car idle rougher with a lighter pulley?

 

it should idle easier. less rotating mass.

 

I agree that lightweight non-damped pullies are to be avoided.

Lower cranksahft mass will NOT result in a smoother idle, while not noticeable to all people a lighter rotating mass will result in more erratic idle. Take the blade off your lawnmower and see how it runs.....youll see my point, the same is true of the ECO.

Getting rid of the damper is yet another much more real issue, its just a straight up bad idea.

Lightweight pullies look good and make our mod list longer and your wallet thinner, thats the long and short of it

 

the ecotec is internally balanced if im not mistaken

 

Ecotec is internally balanced and does not use a damper/balancer pulley. HP gain is not much, a LW pulley was my sons first mod on his cobalt and we dyno his car at work and picked up close to 3hp. He has close to 21,000 with this pulley installed and has had no problems.