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FS Stillen Underdriven crank pulley+belt
12-18-2011, 04:08 PM
#1
Stillen Underdriven crank pulley+belt
Category: Engine - Power Adders
Price: $110
Private or Vendor Listing: Private Listing
Part fits: 2010+ G37 Coupe
Location (State/Prov): Can-AB
Item Condition: Used
asking 110+ shipping, onl has about 100km on it since i sold the car shortly after.
12-19-2011, 11:20 PM
#5
Because I was bored and Google is so easy to use:
What's an*underdrive pulley? An underdrive pulley is a replacement accessory pulley that bolts up the same as stock, but has a different size (ratio) and material specifications intended to free up lost horsepower. By increasing the diameter of each accessory pulley, the speed at which the accessories are turning relative to engine RPM*decreases.*Does this actually make horsepower?
Underdriving the accessories does not*add*power to the engine, it frees up the power that is normally wasted on overdriven accessories. The theory is that a larger pulley will drive the accessories slower thus reducing their parasitic horsepower loss. No more power total, but more power sent to the wheels.* As an additional benefit, the reduction in wear (less usage) on the accessories due to the lower duty cycles can extend the life of these parts.However, a look at each pulley-driven system under the hood will tell you why it isn't as simple as "just a bigger pulley".
What's an*underdrive pulley? An underdrive pulley is a replacement accessory pulley that bolts up the same as stock, but has a different size (ratio) and material specifications intended to free up lost horsepower. By increasing the diameter of each accessory pulley, the speed at which the accessories are turning relative to engine RPM*decreases.*Does this actually make horsepower?
Underdriving the accessories does not*add*power to the engine, it frees up the power that is normally wasted on overdriven accessories. The theory is that a larger pulley will drive the accessories slower thus reducing their parasitic horsepower loss. No more power total, but more power sent to the wheels.* As an additional benefit, the reduction in wear (less usage) on the accessories due to the lower duty cycles can extend the life of these parts.However, a look at each pulley-driven system under the hood will tell you why it isn't as simple as "just a bigger pulley".
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