BPS Underdrive Alternator Pulley (1JZ & 2JZ Engines)

Spinning your alternator passed the factory limit often leads to failure. Extend your alternator’s life by reducing its maximum RPM while maintaining sufficient charge at idle.

Our underdrive alternator pulley will help keep the rpms within a more reasonable range when spinning past the factory limiter. Our pulleys are CNC machined from billet 6061 aluminum and are hard black anodized for a durable finish.

We machine underdrive alternator pulleys for Ford applications as well: 2007-2014 GT500 and 2011-2026 Mustang GT.

BPS part numbers: P301-15, P301-25