underdrive ?

[s-10fan262]

i have a 1995 lt1 trans am with headers, catback, msd, and i seen a mac underdrive pully on ws6 store for $50 do thos really give u 10+ horsepower like it says ?

[ryanwarby01]

i have a 1995 lt1 trans am with headers, catback, msd, and i seen a mac underdrive pully on ws6 store for $50 do thos really give u 10+ horsepower like it says ?

nope. a waste of time and $. If you do a google search you will find many similar responses to mine. I have mine back in its box somewhere. I didn't want to resell it because I thought it would be ripping someone off. Good luck!

[ICEPICK]

ive always heard smaller pullys increases HP, bigger pullys decreases power. maybe its just the drag racers that it works for.

[sman]

Not enough to notice as far as im concerned. Also, should get an alternator OVERDRIVE pulley as well, since your turning all the accessories slower with an UDP.

[98blackbeauty]

OK, never understood any advantage or disadvantages to underdrive pulley except on supercharger for more boost. Someone explain please!

[WMCCjames]

OK, never understood any advantage or disadvantages to underdrive pulley except on supercharger for more boost. Someone explain please!

The slower you spin things the less parasitic drag.

[1999Black_Z28]

Think of changing gears on a pedal bike. The front sproket is like a crank pulley...the smaller it is, the easier it is to turn.

[Nocooler]

I gained nothing from my UDP at the track - D/A was within a 100ft before and after. If you beat on the car a lot it will prolong accessory life, since they are turning slower.