Your factory crank pulley transfers energy from the crankshaft to the water pump, a/c compressor, and alternator via a rubber belt. However, it's quite heavy. The GrimmSpeed Lightweight Crank Pulley cuts down the system's rotational mass, enabling your engine to speed up and slow down the rotating assembly faster. Part #: 095022. Quick Specs: 75% less rotating mass (1.1lb vs 4.4lb OEM pulley), machined from 6061 T6 Aluminum for high - quality precision, hard anodized finish for durability and corrosion resistance, allows use of GrimmSpeed Crank Pulley Tool, and offers a direct factory replacement for easy installation. Design: Our engineers maintained a perfect factory fit while maximizing performance. It's the moment of inertia, not just mass, that impacts engine and throttle response. They kept the minimal mass close to the pulley's center without sacrificing strength. The result? A well - fitting, good - looking pulley that works as intended. You'll notice smoother operation, faster response, and a more enjoyable drive. Datalogs show it quantitatively improves throttle response compared to the OEM pulley. Fitments: 2013+ Subaru BRZ, 2015+ Subaru WRX, 2012+ Subaru Impreza (FB/FA Engines Only), 2011+ Subaru Forester (FB/FA Engines Only), 2012+ Subaru Legacy (FB/FA Engines Only), 2012+ Subaru XV Crosstrek (FB/FA Engines Only), 2013+ Scion FR - S.
Using the GrimmSpeed Blue Lightweight Crank Pulley is easy. It's a direct replacement for your factory pulley, so installation should be straightforward. Just make sure to follow the normal engine maintenance procedures when installing it. As for precautions, always disconnect the battery before starting any work on your engine to avoid electrical hazards. When it comes to maintenance, the hard anodized finish resists corrosion, but it's still a good idea to periodically check the pulley for any signs of wear or damage. If you notice any issues, like strange noises or vibrations, it might be time to take a closer look or replace the pulley. Overall, this pulley is designed to enhance your driving experience, so enjoy the smoother operation and faster throttle response it provides.
