right now i have a MAC UD piggyback pulley and i hate how it rips power from my alt. ive heard some good things about the ASP UD/alt replacement pulley and was wondering what is to be said about them in comparison to the piggyback pulley sets.

 

I've had both and in my opinion the piggyback style = crap and the asp replacement = money well spent.
With the piggyback style I had charging problems with two different cars. On another car I bought the March power and amp set up and I didn't notice any performance difference or charging problem. On my latest car I descided to spend the cash and see what all the hype on asp was about. I must say I like this setup far better. I don't use the alternator pulley just the replacement balancer. I have no charging problems and the motor spins up faster. I swear it runs smoother and I think I could even feel a performance difference up top. I will never waste money on the piggyback crap again.

 

Anyone have a link for asp ????

 

I dont think underdrive pullies are a good idea. They take away power from the alt and power sterring. To be safe one must buy the over drive pulley for the alt. Then the only thing the underdrive pulley is helping one free up power from is the power sterring. The a/c disengages during full throtle or when its off so it dont count. One is freeing up only 5-7 hp and the power steering blows. Try putting a wider tire then 245 and see what happens. i would leave it stock and put money towards something the generates power rather then freeing it up.

 

who are you talking to?

 

Power steering on these cars is overdriven to begin with in my opinion. Alternator definitely needs all it can get, though. WHen the wife's vert had the UD pulley on it, I noticed no difference in the power steering effort. I did notice, however, that the alternator could not even think about doing its job at idle.

One other thing to consider is this: IF the ASP pulley is stock diameter but lighter, keep in mind it will not do as well at dampening crankshaft harmonics as a heavy damper like the ATI or Fluidamper may do.

Ryan

 

The ASP is smaller in diameter than stock.... that's why its an underdrive pulley/damper. Heavy isn't necessarily better.... the Fluidampr and the ATI are significantly different from each other in weight.

 

so what are your thoughts on the asp pulley?

 

I have an ASP pulley, its a NICE piece. Definetly a bit heavier then the stock piece, beautiful machine work on it. Works good I guess, I dont have any alternator or power steering issues. Needs a shorter belt then they tell you it needs IMO. I went with a 10mm shorter belt, also needed to put a new tensioner pully on, because since it's so much smaller then stock, it puts the bottom of the belt where it touches the tensioner higher up on the motor, so the tensioner puts less pressure on it because of that, which necessitated me having to buy a new tensioner.



I'm pleased

 

would it run the same belt as any other UD pulley? im using the 'a/c delete' belt and it fits fine.

 

The ASP one is like 2 pounds lighter than the stocker, definately not heavier. When I put the asp pulley on I gained about 1.5 mph at the track and that was with adding about 40-50 pounds more than I had on my previous best run (seats, heavier battery). I am very pleased with the asp pulley, but I also have the underdriven alternator pulley and am running into some electrical problems and I am going to just put the stock sized alternator pulley back on sometime. Good mod IMO......and for the guy who wanted a link to asp here it is asp

 

so the consensus is, get the highest crank %age and leave the alt alone?

 

I used asp part number ASP945100 and used the belt specified. So far have no clearance issues. I could tell a weight difference in the two holding one in each hand. asp lighter than stock.

 

I could have sworn mine was heavier, if you've weighed them then it may not be the case. -shrug- At any rate, the smaller diameter of it sure puts the polar moment of inertia lower. Using the ASP belt, it flapped more then I liked, so i went shorter.