JHM HD 179mm Overdrive Lightweight Crank Pulley for B8/B8.5 Audi S4/S5/Q5/SQ5 & C7 A6/A7 3.0T
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We're pleased to announce the availability of the JHM "HD" Overdrive Lightweight Crank Pulley for B8/B8.5 Audi S4/S5, Q5/SQ5 & C7/C7.5 A6/A7 equipped with the supercharged 3.0 TFSI engine.
The JHM "HD" Overdrive Lightweight Crank Pulley is an alternative pulley solution for 3.0T owners looking to increase boost without replacing the factory supercharger pulley. With a diameter of 179mm, the black anodized, solid one-piece Overdrive Lightweight Crank Pulley offers the same supercharger overdrive ratio as other aftermarket Stage 2 supercharger pulleys while increasing the total amount of belt contact on the pulley system. While overdrive supercharger pulleys are smaller and limit surface area, the JHM Overdrive Crank Pulley increases surface area instead and reduces the potential for belt slippage.
Factory crank pulleys can fail prematurely due to a two-piece design connected by a rubber isolator. JHM eliminated this failure-prone design and constructed theirs from billet aluminum in favor of simplicity and increased reliability. The JHM unit weights a mere 5.05lbs, roughly 40% less than the 8.6lbs factory pulley and frees up some horsepower by reducing the rotating mass on the engine.
Solid, One-Piece Construction
40% Weight Reducion Over Factory Crank Pulley (JHM 5.05 lbs vs OEM 8.6 lbs)
Increased Belt Contact Surface Area
Same Effective Overdrive Ratio As Aftermarket Stage 2 Supercharger Pulleys (Stage 2 Software Compatible)
JHM "HD" 179mm Overdrive Lightweight Crank Pulley
8mm x 1.25 Allen Bolts x 8
Gates High-Quality Belt
2010 - 2016 Audi S4 3.0T (B8/B8.5)
2013 - 2016 Audi S5 3.0T (B8/B8.5)
2010 - 2016 Audi Q5/SQ5 3.0T (B8/B8.5)
2012 - Present Audi A6 3.0T (C7/C7.5)
2012 - Present Audi A7 3.0T (C7/C7.5)
Installation Notes: The JHM "HD" Overdrive Lightweight Crank Pulley installs just like your OEM pulley. So, just like you must do with the OEM pulley, make sure that the offset bolt hole on the JHM Crank Pulley matches up to the offset hole on the crank. Then, torque all supplied crank pulley bolts to 20 ft-lbs in a star pattern. We also recommend using Loctite.
Replaces factory part numbers 06E 105 251 E, 06E 105 251 F.