83mm Supercharger Pulley for Mercedes Benz AMG (2003-2008) with M113K Engines

Optimizing Boost and Rotational Mass for the AMG M113K Powerplant

Who It’s For: Engineered for Mercedes Benz owners running the M113K supercharged V8 who want to unlock the latent potential of their Kompressor system without compromising daily reliability.

The Symptom: From the factory, the heavy AMG chassis—like the E55 or G55—requires massive amounts of low-end torque to overcome its own inertia. The stock supercharger pulley is designed with a conservative diameter and significant rotational mass, which leads to a softer boost curve and a slight lag in throttle response. This factory setup prioritizes extreme quietness over the immediate, neck-snapping torque these 5.4L engines are actually capable of producing.

The Engineering Fix: This 83.7mm pulley utilizes a reduced diameter to increase the supercharger’s step-up ratio, effectively spinning the internal rotors faster at lower engine RPMs. By constructing the pulley to be 35% lighter than the OEM steel unit, we significantly reduce parasitic drag and rotational inertia, allowing the engine to reach peak boost much faster. The addition of a specialized nitride coating on the clutch plate and a friction-enhancing surface treatment ensures that the extra power is delivered to the belt without the slip often found in lesser aftermarket designs.

Why Mechanics Choose This Kit

• Substantial Power Gains: Real-world testing shows increases of 45 to 50 rear-wheel horsepower and torque, providing that “freight train” pull through the entire powerband.
• Reduced Component Stress: By shedding 35% of the factory rotational mass, you reduce the wear on the supercharger snout bearings and internal clutch mechanisms.
• Patented Reliability: This design features an improved nitride-coated clutch, plate, and spring assembly (Patent# D716356S) to maintain factory-level engagement smoothness.

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
• 2003-2008 Mercedes Benz SL55 AMG
• 2006 Mercedes Benz CLS55 AMG
• 2005-2011 Mercedes Benz G55 AMG

The Performance Promise

Buy with confidence. This system is a direct bolt-on upgrade that maintains excellent drivability and highway fuel economy. Please note that a performance ECU tune is required to properly scale fuel and timing maps for the increased boost levels provided by this 83mm pulley.

Common Questions

Which Mercedes-Benz AMG models does this 83mm supercharger pulley fit?
It fits Mercedes-Benz AMG models equipped with the supercharged 5.4L M113K V8 engine, including the 2003-2006 E55 AMG, 2003-2006 S55 AMG, 2003-2006 CL55 AMG, 2003-2008 SL55 AMG, 2006 CLS55 AMG, and 2005-2011 G55 AMG.

Is an ECU tune required when installing this pulley?
Yes, a performance ECU tune is required to properly scale the fuel and timing maps for the increased boost pressure generated by the 83.7mm pulley.

What horsepower and torque gains can I expect?
Testing shows gains of 45 to 50 rear-wheel horsepower and torque thanks to the smaller 83.7mm diameter spinning the supercharger rotors faster and a 35% reduction in rotational mass over the stock steel pulley.

Does this pulley retain the supercharger clutch mechanism?
Yes, it features a patented (Patent# D716356S) nitride-coated clutch, plate, and spring assembly designed to maintain factory-style engagement smoothness while preventing belt slip.

Will this fit naturally aspirated AMG models or non-Kompressor engines?
This pulley is engineered specifically for the supercharged 5.4L M113K Kompressor V8 found in the 55 AMG models rated at 469-493 HP and 516 lb-ft of torque from the factory.