underdrive pulleys dumb question
Drifting
Joined: May 2004
Posts: 1,822
Likes: 2
From: San Clemente CA
Essentially an underdrive pulley slows down the accessory it's driving, thus using less hp to drive it. You gain a few ponies, but you also risk running hotter and generating less voltage, etc. The pulley will be larger than the stock pulley, thus turning the accessory more slowly.
Burning Brakes
Joined: Feb 2004
Posts: 831
Likes: 0
From: Country Boys Can Survive.
Originally Posted by TheDVS1
Essentially an underdrive pulley slows down the accessory it's driving, thus using less hp to drive it. You gain a few ponies, but you also risk running hotter and generating less voltage, etc. The pulley will be larger than the stock pulley, thus turning the accessory more slowly.
Drifting
Joined: Oct 2004
Posts: 1,384
Likes: 8
From: Southwest Virginia
The "underdrive pulleys" you read about on the forum is nothing more than a smaller crank pulley. Like TheDVS1 stated they reduce the speed of the of the accessories by some percent. The slower the accessories turn, the less HP they will use. I stayed away from them becasue I worry about low speeds running like idling around town.
Actually a under drive crank pulley is smaller to turn the accessories slower. Being the crank is the driving pulley then making it smaller will slow the accessories. If you were changing all the other pulleys (all the driven pulleys) then they would need to be larger to slow the accessories.
Originally Posted by TheDVS1
The pulley will be larger than the stock pulley, thus turning the accessory more slowly.
Drifting
Joined: May 2004
Posts: 1,822
Likes: 2
From: San Clemente CA
Originally Posted by SpeedyZ
Actually a under drive crank pulley is smaller to turn the accessories slower. Being the crank is the driving pulley then making it smaller will slow the accessories. If you were changing all the other pulleys (all the driven pulleys) then they would need to be larger to slow the accessories.
