Underdrive Alternator Pulley

The MWR Underdrive Pulley is a performance-oriented upgrade for Lotus and Toyota 1ZZ and 2ZZ engines, engineered to reduce parasitic drag on the charging system. By decreasing the alternator rotational speed by 25%, this lightweight pulley minimizes the power consumed by the alternator, allowing more engine output to reach the wheels. Installation of this underdrive pulley may require the use of a different drive belt length depending on the specific engine and accessory configuration. Users should verify belt requirements for their specific vehicle setup to ensure proper tension and component clearance. This pulley is specifically designed for 1ZZ and 2ZZ engine applications, providing a straightforward way to reduce the load on the engine's rotating assembly.