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JHM HD Overdrive (179mm) Lightweight Supercharger Crank Pulley for B8-B8.5, S4-S5, C7 A6-A7, Q7 and B8 Q5-SQ5 3.0T FSI

JHM HD Overdrive (179mm) Lightweight Supercharger Crank Pulley for B8-B8.5, S4-S5, C7 A6-A7, Q7 and B8 Q5-SQ5 3.0T FSI

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- Just like the JHM "HD" Lightweight Crank Pulley, the Overdrive Lightweight Pulley also eliminates the two piece design and rubber isolator found in the stock crank pulley while also reducing the mass of the motor's rotating assembly.
- Additionally (and most importantly) our Overdrive pulley has the same supercharger overdrive ratio as all of the other popular stage 2 supercharger pulleys on the market. This allows you to achieve the same supercharger speed required for most companies' stage 2 tuning without having to purchase special tools or scar the stock supercharger pulley with installation marks. Installation of our Overdrive pulley is completely reversible!
- Converting to a single piece, solid crank pulley without the rubber isolator will prevent separation of the crank pulley and damage to your motor and/or accessories while reducing the rotating mass of the engine's rotating assembly will also free up horsepower.
- The JHM Overdrive Crank pulley achieves the same supercharger speed as a smaller supercharger pulley while increasing the total amount of belt contact in the belt and pulley system. When you decrease the size of the supercharger pulley there is less surface for the belt to grip the pulleys which can lead to slippage. Our JHM Overdrive Crank Pulley increases grip and prevents slippage.
- Our JHM "HD" Overdrive Lightweight Crank Pulley is anodized black to look stock and blend in.
- Though this is not recommended, we have had independent reports from our customers who have used our JHM Overdrive Crank Pulley along with a smaller, aftermarket supercharger pulley to "double up" and spin the supercharger even faster. Spinning the supercharger faster may increase wear and could shorten the life on the unit. Please consult with your software provider before "doubling up" on our Overdrive Crank Pulley and a smaller supercharger pulley.


- OEM 3.0T Crank Pulley Weight: 8.57 to 8.62 pounds
- JHM "HD" Overdrive Lightweight Crank Pulley Weight: 5.05 pounds
That's a weight reduction of over 40%!!!


- 1x JHM "HD" Overdrive Lightweight Crank Pulley
- 8x 8mm x 1.25 Allen Bolts

- 1x 7PK1290 belt for 179mm crank pulley and STOCK or 56mm-57mm blower pulleys. NOTE: For the C6 A6 3.0T we recommend the 7pk1300 as the 1290 belt can be a little difficult to install


Our 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 OEM PNs 06E 105 251 E, 06E 105 251E, 06E105251E, 06E 105 251 F, 06E 105 251F, and 06E105251F