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 slashes the system's rotational mass, enabling your engine to speed up and slow down the rotating parts faster. Part #: 095024. Quick Specs: 75% less rotating mass (1.1lb vs 4.4lb OEM), machined from 6061 T6 aluminum for high - quality precision, hard anodized finish for durability and corrosion resistance, allows use of the GrimmSpeed Crank Pulley Tool, and offers factory fitment for easy installation. Design: Our engineers maximized performance while keeping a perfect factory replacement fit. It's the moment of inertia, not just mass, that affects the pulley's ability to enhance engine and throttle response. We kept the minimal mass close to the pulley's center without losing strength. The result? A well - fitting, good - looking pulley that works great. You'll feel 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 Red Lightweight Crank Pulley is straightforward. First, make sure your engine is cool before starting the installation. You can use the GrimmSpeed Crank Pulley Tool to remove the old pulley and install the new one as it's a direct replacement for your factory pulley. When driving with the new pulley, you'll quickly notice the improved throttle response and smoother operation. As for maintenance, there's not much you need to do. The hard anodized finish resists corrosion, but it's still a good idea to check it periodically for any signs of wear or damage. If you live in an area with harsh weather conditions, you might want to give it a quick clean every few months to keep it in top shape. And always remember, if you have any questions or run into any issues, you can reach out to our support team.
