MotoBlue GEN X Underdrive Pulley for your 2007-2013 Chevy Truck / SUV

MotoBlue GEN X Underdrive Pulley


for your 2007-2013 Chevy Truck / SUV

What's an underdrive pulley?


An underdrive pulley is a replacement 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 and decreasing the size of the crank pulley, the speed at which the accessories are turning relative to engine RPM decreases.

Under drive pulleys do not add power to the engine, they free 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.


Always in stock

For example, the alternator, power steering, water pump and air compressor rob horsepower from the engine. By replacing factory-sized crank balancer/pulley and water pump drive pulley with a resized pulleys, the accessories are slowed, resulting in more horsepower available to the drive wheels.


MOTOBLUE H.O. Series pulleys will increase horsepower up to 12 RWHP, and increase mileage by 1 to 2 MPG. MOTOBLUE H.O Pulleys are manufactured from billet steel, exceeding factory quality and are the only Pulley system available on the market today that are SFI approved for all racing applications.


When purchasing the MOTOBLUE UnderDrive crank pulley, there are two options for alternator pulley selection:


Stock Alternator Pulley - Most commonly used. Suitable for most applications.


Overdrive Alternator Pulley - Recommended for automatic cars to help bring alternator speeds back to near stock levels without sacrificing too much horsepower. Extremely important for vehicles with high accessory drag such as cars with lots of stereo modifications.


Tech Note: Does not cause false knock retard or erratic power-curve dips and needs a new balancer bolt. The use of a Harmonic Balancer Puller tool required for factory Harmonic Balancer removal.


25% Crank Underdrive Balancer (only)

  • A/C Belt - Dayco 5040345 or 34.5″
  • Drive Belt - Dayco 5060895 or 89.5″
  • Balancer Bolt - SL-N-Bolt 12557840

25% Crank & 32% Overdrive Alternator

  • A/C Belt - Dayco 5040345 or 34.5″
  • Drive Belt - Dayco 5060882 or 88.2″
  • Balancer Bolt - SL-N-Bolt 12557840

MotoBlue GEN X Underdrive Pulley


Fits 2007-2013 Chevy
Truck / SUV


Features:

  • 25% Underdrive Pulley
  • SFI Approved

MotoBlue GEN X Underdrive Pulley


Fits 2007-2013 Chevy
Truck / SUV


Features:

  • 25% Underdrive Pulley
  • 32% Overdrive Alternator
  • SFI Approved