Heavy underdrive pulley???
Heavy underdrive pulley??? I just bought a summit underdrive pulley. It looks like a good quality but it is heavier than the stocker. i dont have a way to measure it besides a bathroom scale that says it weighs 12 lbs. and the stock 11lbs. I dont know if these weights are correct but it seems like the summit is a lot heavier. I thought the whole point of an underdrive pulley is so it spins faster but i cant imagine even if it is smaller in size that the weight wont ruin the benefit?
please help with advice and maybe the weight of another aftermarket companies pulley.
nick
please help with advice and maybe the weight of another aftermarket companies pulley.
nick
Faster n you98 since the pulley is something like 25% smaller in diameter than your stocker it spins all of the accesories (alternator, AC, water pump, power steering) on that belt 25% slower which results in freeing up a few HP. The only downside is your components will be spinning a little slower so your AC might not work as well at a low RPM, alternator might put out just a little less amperage, and the water pump won't be pumping as much water through your radiator. I haven't heard of anyone complaining too much about these small effects though so I wouldn't worry about it!
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I have no a/c problems, charging problems, or problems of any kind. oh just more of a traction issue lol. I'll keep my gains and my losses
Teching In
Joined: Apr 2008
Posts: 39
Likes: 0
From: Jacksonville AR
i'm sorry i dont know what the asp is? i've heard that all of these have a negative effect on your a/c and living in AR i'm not gonna sacrafice my a/c for 8hp. if anyone can help clarify i'd love some info and which one to go with.
thanks
So every underdrive crank pulley I have ever owned you use an overdrive alternator pulley to keep the volts up. Is it safe to say everything stays relatively where it should just changing the crank pulley? And exactly what kind of gain do you see with the ASP unit in HP/Torque?
TECH Regular
Joined: May 2008
Posts: 458
Likes: 0
From: Marissa, Il
Had an ASP underdrive on my 98 SS and it was lighter than the stock pulley.
I believe alot of it has to due with the construction of the parts.
the asp is aluminum and the stock is cast Iron i believe.
so it may come down to what the manufacturer used to make their product.
BTW I did not have an overdrive pulley for any of the acessories.
And the biggest thing that I noticed was wheel spin (no traction with new drag radials at the track with a good burnout)
I have also heard of some pulleys causing false knock, but I do not know if that is true or not?
I believe alot of it has to due with the construction of the parts.
the asp is aluminum and the stock is cast Iron i believe.
so it may come down to what the manufacturer used to make their product.
BTW I did not have an overdrive pulley for any of the acessories.
And the biggest thing that I noticed was wheel spin (no traction with new drag radials at the track with a good burnout)
I have also heard of some pulleys causing false knock, but I do not know if that is true or not?
Teching In
Joined: Apr 2008
Posts: 39
Likes: 0
From: Jacksonville AR
ordered my 25% underdrive pulley yesterday with both belts. (ASP) through thunder racing everything was $278 shipped. the pulley was cheaper at ws6project however they didnt have the belts plus thunder included the bolt! it'll go on the car when i do the cam swap if i ever get out of the desert
FWIW, on an old LT1 car of mine I had a set of March underdrive pullies. That particular setup required that the stock balancer be mounted on the outside of the UDP, because the UDP didnt do any balancing. It came with a much longer bolt and it was literally sandwiched inbetween the balancer and the crank. I didnt think anything of it afterwards because with an electric waterpump, shorties, UDP, and 4.10s that bitch still got 30mpg on the interstate doin 75mph with the AIR on!
