Anyone know how well underdrive pullies work?

[JH]

Well i ordered it hopefully i filled everything out right lol

[Bratok]

I remember reading somewhere that UD pulleys can damage your harmonic balancer...

[bszopi]

I remember reading somewhere that UD pulleys can damage your harmonic balancer...

That's an interesting statement.... On these engines, the pulley is basically your harmonic balancer, therefore if it is replaced, it can't really damage it. There have been arguements that have stated that the UD pulleys are lighter and thus don't provide for the proper dampening of the engine, but I have yet to hear anyone in the 660 community have issues destroying their engines due to the UD pulley.

[Mitch DOHC]

the pully is a seprate unit for the DOHC moter i have had mine on for about 30K and have had know problems thus far and as of the other day my ballencer seemed to be in good shape as well to.... i looked every thing over when i put my new dif in

[Cannonball]

I have an ASP underdrive pulley on my Fiero. It works. Track times for people who have tested it usually show 1-2 tenths better 1/4 mile times. The only thing is, if your car is old or high mileage, you should check the alternator with a meter to make sure it's good. People believe the in car guage as being accurate when they're really only to give you an idea of what's going on. If the alt. is old it may be weakened and not showing much loss on the cars gauge but it will show up when you put on an underdrive pulley if it's weak. Better to check it first and replace if necassary rather than put on the pulley and find out the hard way. I replaced my alt. at the same time that I put on the pulley and have no charging problems.
I also have no heat issues either. Temp is cool as always.

[bszopi]

the pully is a seprate unit for the DOHC moter i have had mine on for about 30K and have had know problems thus far and as of the other day my ballencer seemed to be in good shape as well to.... i looked every thing over when i put my new dif in

Not to be an ass, but...

If the guy is wondering about UD pulley's, it probably for his car. Since its in the pushrod section, does it matter how the DOHC is setup? No. I mean, its good to hear that you haven't had any problems with it, but different engines react differently to mods. Since the DOHC has a seperate balancer, there is a very good chance that it will act different than the pushrod where the balancer is intergral.

[Mars]

Fedex left me a "we missed you" sticker on the door while I was at school today, so I will finally have mine tommorrow.

[Mitch DOHC]

i know that this is the pushrod section... and their was a question asking does the underdrive hurt the balancer... and sence the pushrod underdrives are the balancer as well... i thought that somone might want to know what effect it has on a car with a seperate ballancer.... that's all

[JH]

LOL its cool i own a Z34 with the DOHC as well as a 3.1 so it all info helps.

[JH]

My altenator is 1 year old now i went through 3 used altenators and the last one that went made me walk 5km at 5am so i decided to buy a brand new one with a 5 year warranty.

[TheProfessor]

all 88 and later pushrod 660s are internally balanced
no harmonic balancer

[RacerX11]

all 88 and later pushrod 660s are internally balanced
no harmonic balancer

All 660's have a neutral-balance front damper, this did not change in '88. The only difference is the crank counterweights and the flywheel/flexplate counterweights between the early and late engines.

Marty

[TheProfessor]

really ill have to read my manual again lol

[xonelith]

I plan to purchase an underdrive pully from ffp as my next mod. I'll keep you posted if I have any problems.

xon

[RebelGT]

the FFP pulley has been dyno'd a few times, once by myself, on a 3.1L MPFI you're looking at a 5-7whp increase.