Your factory crank pulley transfers energy from the crankshaft to the water pump, A/C compressor, and alternator via a rubber belt. It works well, but it's quite heavy. This is due to less - costly manufacturing and using the pulley's mass to smooth out accessory system 'noise' (it's not a harmonic dampener). The GrimmSpeed Lightweight Crank Pulley slashes the system's rotational mass, enabling your engine to speed up and slow down the rotating parts much faster. Part #: 095023. Quick Specs: It cuts rotating mass by 75%, weighing just 1.1lb compared to the 4.4lb OEM pulley. It's made of machined 6061 T6 Aluminum for high - quality, precise construction. The hard anodized finish makes it durable and corrosion - resistant. It has a removal tool mounting for use with the GrimmSpeed Crank Pulley Tool and offers a factory fitment for easy installation. Design: Our engineers maintained a perfect factory replacement fit while maximizing performance. It's a myth that a crank pulley's mass alone determines its effectiveness. It's the moment of inertia that impacts the pulley's ability to enhance engine and throttle response. Lower moment of inertia means less torque is needed to spin the pulley and engine. Our engineers kept the minimal mass close to the pulley's center without sacrificing strength. The result is a well - fitting, good - looking pulley that works as expected. From your first test drive, you'll notice smoother operation, quicker response, and a more enjoyable drive. Data logs show that 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 Lightweight Crank Pulley is straightforward. It's a direct replacement for your factory pulley, so installation is easy. Just follow the normal procedures for removing the old pulley and fitting the new one. Make sure to use the GrimmSpeed Crank Pulley Tool for removal if needed. When installing, double - check that it fits properly. As for maintenance, the hard anodized finish resists corrosion, but it's still a good idea to keep it clean. Regularly inspect it for any signs of wear or damage. If you notice any issues like unusual noises or vibrations, have it checked right away. This will help keep your engine running smoothly and ensure you enjoy the improved throttle response and performance that the pulley offers.
