My friend just picked up a Saleen supercharged blue GT not but 4 days ago, and all of a sudden the belt keeps slipping off. After further investigation, it's the harmonic balancer. It's splitting between the inner pulley and the outer grooved ring because the rubber gasket inbetween it is coming apart. The car is dynotuned, so my question is...

A) what's a good heavy duty harmonic balancer for a boosted 4.6 and
B) If I get the same size pulley, will the car still need to be retuned if the weight of the pulley is different?

The car is just chilling in a parking lot so we need to get this solved ASAP any help would be appreciated.

 

Two brands that are good: ati superdamper and innovators west.

You shouldn't need to retune the car for a different weight pulley.

The quickest option though may be to go to your ford dealer for a stock crank pulley.

 

Yeah, ATI or IW.
S197 dampers are 0 balance, so weight or size makes no difference in anything but belt length.

 

How long is a stock harmonic balancer supposed to last?

Is there any benefit using an aftermarket one?

 

The car only has 40 or so thousand miles on it, but it's on 07 so it must have been sitting for awhile and rotted then after we got it all the force being put back on it wore it all out. The benefit to an aftermarket one is the same a any pulley, lighter weight.

 

The aftermarket dampers are "contained" - very little chance of launching a chunk of iron through the radiator or hood. In addition to lighter weight, they are also tuned to be more effective at absorbing vibration - smoother, higher revs; less chance of loosing the crank snout; and on mod motors, especially, safer for the oil pump.

I am putting an ATI on my new B326.