A burning belt smell from your 2020 Dodge Charger Hellcat's supercharger drive system indicates belt slippage under the massive power loads. The supercharger drive belt transfers tremendous torque and must maintain grip to avoid slipping, which generates heat and burning rubber smell.
Supercharger Belt Demands
The Hellcat's 2.4L supercharger produces up to 11.6 PSI of boost, requiring significant power to drive. The 8-rib serpentine belt must transmit this power without slipping, especially during hard acceleration when boost pressure peaks. Even brief slippage creates noticeable heat and smell from the belt friction.
Why Belt Slip Occurs
Supercharger belt slippage can result from belt wear reducing grip capability, inadequate belt tension from tensioner wear, oil or coolant contamination on belt or pulleys, pulley wear or damage affecting grip surface, and modified power levels exceeding belt capacity. High ambient temperatures can also reduce belt grip.
Symptoms of Belt Slip
Beyond the burning smell, supercharger belt slippage shows as squealing or chirping during hard acceleration, reduced boost pressure readings, visible belt glazing or heat damage, black residue on the pulley or nearby components, and inconsistent power delivery under load.
Inspection and Diagnosis
Inspect the supercharger belt for wear indicators, cracks, glazing, or edge fraying. Check belt tension - some Hellcat belts have specific tension specifications. Look for fluid contamination on the belt or pulleys. Verify pulley condition and alignment. Check boost gauge readings during acceleration for expected values.
Solutions
Replace worn or damaged belts with OEM or quality high-performance replacements. Some owners upgrade to wider or more aggressive belt profiles for improved grip. Ensure proper tension after belt installation. Address any fluid leaks contaminating the belt area. For heavily modified engines, belt and pulley upgrades may be necessary.