ACT 2005 Mitsubishi Lancer HD/Perf Street Sprung Clutch Kit
The ACT MR1-HDSS is the street-friendly upgrade for a 4G69-powered Mitsubishi: the 2005 Lancer Ralliart named in our listing, plus the rest of the 2004-2006 Ralliart run and the 2006-2012 Eclipse GS 2.4L. Most buyers find it after the factory clutch starts slipping in the upper gears, the engagement point creeps high, or a headers-and-intake car simply wears through its stock disc. It holds noticeably more torque than the original clutch while keeping a takeoff that is easy to live with in traffic.
The 4G69 is a 2.4L SOHC four-cylinder mounted sideways, so the clutch sits between the crank and a front-drive transaxle. When the pedal is up, the pressure plate diaphragm clamps the disc against the flywheel and every bit of crank torque has to pass through that friction surface. ACT rates this kit at 275 ft-lb measured at the crank, 38 percent over the OE clutch.
The extra grip comes from the MB020 Heavy Duty pressure plate, which uses ACT's own diaphragm design to raise clamp load and limit deflection, and each diaphragm goes through a four-stage heat treatment. The 3000303 disc is a 224 mm (8.8 in) Performance Street disc with a sprung hub and premium organic facings that run high copper content for heat transfer on a steel-backed lining. ACT describes the feel as light to moderate pedal effort with smooth, positive engagement and OE to mild gear rattle, which is why this is the kit for a car that still sees a daily commute. If you are running far more power or launching on sticky tires, the 6-pad ceramic MR1-HDG6 uses the same plate and is rated at 350 ft-lb.
Check the release side first. A low or dark reservoir, a weeping slave cylinder or air in the line all cause drag and hard shifts that feel like a bad clutch but are not. For slip, do a loaded pull: fourth gear from low rpm at full throttle while you watch the tach against the speedometer. If the needle jumps without the car pulling, the friction surfaces are done. Our slipping diagnosis guide covers how to read that test, and five symptoms shops misdiagnose is worth a read before you pull the transaxle. Once it is apart, look for oil on the flywheel face; a leaking rear main seal will contaminate any new disc.
Our listing is titled for the 2005 Lancer. ACT's application list for MR1-HDSS is 2004-2006 Mitsubishi Lancer Ralliart 2.4L (4G69) and 2006-2012 Eclipse GS 2.4L SOHC, including the 2007-2009 Eclipse Spyder GS, all with a 0.875 in input shaft. It does not fit the 2.0L Lancer ES, LS or O-Z Rally, and it is not an Evolution clutch. If your car has had a transaxle or engine swap, send us the year and VIN before ordering so we can match it. More clutch and rebuild parts are in our rebuild kits collection.
No flywheel is included, so have the stock flywheel resurfaced or replaced; a scored or heat-checked face will cause chatter no matter how good the new disc is. These are front-drive applications, so ACT lists no pilot bearing for this kit. Center the disc with the AT20 tool, run the pressure plate bolts down in a crisscross pattern to the factory torque, put a light film of grease on the input splines, and inspect the fork and pivot while the bearing is out. Bleed the hydraulics with the fluid named on the reservoir cap. ACT recommends 300 to 500 miles of mild stop-and-go driving to break in its organic street discs before any hard launches. Expect the pedal to be somewhat firmer: ACT says its Heavy Duty plates usually add 15 to 40 percent pedal effort. If you only want the plate, the MB020 pressure plate is sold on its own.
| Brand | ACT |
| Part number | MR1-HDSS |
| Fits | ACT 2005 Mitsubishi Lancer HD/Perf Street Sprung Clutch Kit |
| Vehicle fitment | Mitsubishi Lancer Hd/Perf (2005) |
| Type | Clutch Kits - Single |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
No. It is for the 2.4L 4G69 Ralliart (2004-2006) and the 2006-2012 Eclipse GS 2.4L. The 2.0L Lancer and the Evolution use different clutches.
ACT rates it at 275 ft-lb at the crank, which is 38 percent over the stock clutch. That covers bolt-ons and mild tunes on a naturally aspirated 4G69.
For a street car, this one. The organic disc engages smoothly. The MR1-HDG6 ceramic 6-pad kit holds 350 ft-lb but engages harshly and suits forced induction or racing.
No flywheel. ACT lists no pilot bearing for these front-drive cars. The kit includes the pressure plate, disc, release bearing and alignment tool.
A little. ACT says its Heavy Duty plates typically raise pedal effort 15 to 40 percent depending on the car, while keeping light to moderate effort overall.
Drive 300 to 500 miles with mild engagement, ideally stop-and-go city driving, before racing or hard launches. Avoid overheating it during that period.
