what is an under drive pully

[90lazerturbo]

was just wondering what an under drive pully set was? i thought it was just stock pullys just light weight.i seen on a diffrent thread some one was asking about bigger belts to run them so that would mean the udp were smaller. thanks for your input....

 

[miamieclipse]

yes udp are lightweight, smaller than your stocker (mine is 2 or 3 lbs i beleive, compared to my 10lb stock one ).

 

[GSGoinFast]

they do what the name says, underdrive your accessories. bigger belts doesnt make sense since the pully is smaller it a nice mod, just tighten your belts alot when you install it or you will get mad annoying squeeking

 

[90lazerturbo]

so i can use the same stock belts then? just wondering because i just replaced all my belts .. thanks

 

[GSGoinFast]

so i can use the same stock belts then? just wondering because i just replaced all my belts .. thanks

no i think you need smaller belts, i believe the belts that came with mine were smaller then the stock ones.

 

[Defiant]

An underdrive pully is smaller-diameter than a stock setup. This reduces the load on the accessory end of the driveshaft, and runs the accessories at lower RPMS compared to what they were being turned at a given crank speed before. Some sets compensate for this with smaller accessory pulleys. And yes, the belts need to be replaced.

 

[slider85]

i would do my research and be careful about lightened pullies. I just went down to my local auto shop today and asked about them. Apparently one guy there, who I talked to, put on different pulleys and ended up going through his battery and alternator in a couple of weeks because the alt. is not made to be spun slower than stock. Also, if you have a stereo or ac or any load it will run down your battery and possibly wreck your computer. Be warned. Talk to the professionals. UDP's are good for racing, not daily driving.

 

[Fez1085]

Yeah well, i've searched on this topic several times, and i've heard nothing bad. The only thing you will have to worry about is that while you are idling.. your headlights might dim down, and that your AC might not be as strong as it was for before. As for a stereo system.. I've got 2 10" subs with a 800w amp, and i was told that if you aren't pushing more than 1000w, then you wouldn't have to worry about it. Plus, even if you were pushing more than 1000w, all you would really need is a capacitor. So i'd say go for it. Its a great power gain, and i've heard nothing but good things about it

 

[KlowdDragon]

i dont want that then, i was thinkin about gettin the unorthodox pullet set, but thats crap, i didnt know they were smaller and shyt, i thought they were just made out of lighter material, d@mn!t, ive seen only good gains from udp's too, hmph

 

[GSGoinFast]

ive never had any trouble like that, just squeeking belts. nooo idle power problems

 

[KlowdDragon]

i was lookin at the unorthodox site and it didnt sound so bad, looks like i'll still be getting the set