80MM Fixed Supercharger Pulley for Mercedes Benz (2003-2007) AMG M113K Engines

80MM Fixed Supercharger Pulley Upgrade for the Mercedes-Benz M113K V8

Who It’s For: Engineered for Mercedes-Benz AMG owners running the M113K powerplant who are tired of the stock sluggishness and the mechanical failures associated with the factory clutched pulley system.

The Symptom: The factory clutched pulley on the M113K is a massive mechanical bottleneck designed more for luxury-brand "smoothness" than raw performance. Because the OEM system relies on an electromagnetic clutch to engage the supercharger, there is a distinct lag in power delivery as the magnets pull the plate in. Furthermore, the factory assembly is incredibly heavy; this high rotational inertia makes the engine feel lazy during transitions. As these vehicles age, the internal bearings and springs within that clutched unit frequently fail, leading to belt slip, chirping, and a significant loss of boost pressure.

The Engineering Fix: Our 80mm fixed pulley solution converts your supercharger to a direct-drive configuration, removing the heavy and failure-prone factory clutch assembly entirely. By shedding 35% of the rotational mass, we allow the M113K to spin up much faster, significantly improving throttle response. The 80mm diameter increases the drive ratio, spinning the Eaton blower faster to generate higher boost levels across the entire powerband. To ensure this power reaches the ground, we use a specialized nitride coating on the pulley surface to maximize the coefficient of friction, preventing belt slip even under high-heat, high-load conditions.

Why Mechanics Choose This Kit

• Instant Torque Delivery: By removing the clutch engagement delay, the M113K provides immediate 70+ WHP gains and sharper mid-range punch to move these heavy AMG chassis.
• Rotational Efficiency: The 35% reduction in weight significantly lowers the load on the supercharger snout and engine crankshaft, promoting better long-term reliability of the M113K internals.
• Bulletproof Construction: Features a high-grade nitride coating and a patent-pending fixed design that eliminates the bearings and springs known to fail on OEM clutched pulleys.

Technical Specifications

Compatibility & OEM Reference

Fits the Following Vehicles:

• 2003-2006 Mercedes-Benz E55 AMG
• 2003-2006 Mercedes-Benz S55 AMG
• 2003-2006 Mercedes-Benz CL55 AMG
• 2003-2007 Mercedes-Benz SL55 AMG
• 2006-2006 Mercedes-Benz CLS55 AMG
• 2005-2011 Mercedes-Benz G55 AMG Kompressor

Interchange Part Numbers:

80MM-FIXED-M113K-AMG, M113K-55-PULLEY, FIXED-80-AMG-K

The Performance Promise

Buy with confidence. This upgrade requires a specialized ECU tune to manage the increased boost levels and the removal of the clutch engagement signal. Backed by real automotive experts and fast shipping to get your AMG back on the road with more power than ever before.