Fitment Information: This ACT 4 Pad Sprung Race Disc (4228218) fits 2002 - 2018 Subaru WRX, 2005 - 2012 Subaru Legacy GT, 2005 - 2009 Subaru Outback XT, and 2004 - 2008 Subaru Forester XT. Note that starting mid - 2018MY production with VIN J*806877, Subaru incorporated 240mm clutch components, and ACT discs aren't compatible with these revised OEM parts. Features: Crafted from high - quality ceramic friction materials, this 4 - pad spring - centered race disc offers a harsher engagement but faster shifting. Its heavy - duty torsional dampening springs are stronger than standard ones, sized and rated perfectly for the application. With a heat - treated spring steel drive plate, it's ideal for smaller engines with smaller disc sizes. Feel: Aggressive engagement, quick shifts, and a bit of gear rattle similar to OE to mild levels. Recommended Use: Strictly for race use. ACT Difference: It has high burst strength and can hold 28% more torque than typical organic materials. FAQ: Can an ACT Race puck - style disc be used for daily driving? No, it's not recommended. ACT's race discs are very aggressive, with a harsh engagement. Starting from a stop can cause judder and noise. They're only for professional race settings. ACT suggests using an organic disc on the street for a smoother ride and long - lasting performance. When to replace a clutch disc: Most new discs are 0.312 - 0.315 inches (7.93 - 8.00mm) thick. They should be replaced when they reach 0.275 inches (7.00mm) or less. Some applications start at 0.332 - 0.335 inches (8.43 - 8.50mm) and need replacement below 0.295 inches (7.50mm). Measure with a micrometer. Puck discs are measured as they are, while organic street discs need the engagement cushion compressed. If the lining rivets touch the flywheel or pressure plate, replace the disc. Using a disc outside the pressure plate's working range can lead to poor results.
Using this ACT 4 Pad Sprung Race Disc is straightforward. First, make sure your vehicle is one of the compatible Subaru models mentioned in the fitment information. If your car's VIN is from mid - 2018MY production starting with J*806877, this disc won't work due to revised OEM components. When it comes to use, remember this disc is only for racing. Don't use it on the street because it has a harsh engagement which can cause judder and noise when starting from a stop. For maintenance, regularly check the thickness of the disc. Use a micrometer to measure it. If it reaches the minimum thickness specified in the FAQ section, it's time to replace it. Also, keep an eye on the lining rivets. If they touch the flywheel or pressure plate, replace the disc right away. Always follow ACT's recommendation of using an organic disc for daily driving to ensure a smooth and long - lasting performance.
