ACT Heavy Duty Race Rigid 4 Pad Clutch Kit with Monoloc (SB10-HDR4)
Note: Includes ACT Monoloc.
SB10-HDR4 kit features ACT's most popular Heavy Duty pressure plate. ACT Heavy Duty pressure plates use exclusive diaphragm design to increase clamp load, reduce deflection and maximize clutch life. All diaphragms endure a four-stage, heat-treating process for unparalleled performance. ACT pressure plates have precision cover stampings to provide rigidity and consistency. ACT's 4-pad rigid race discs are made with high quality, ceramic friction materials. The chrome-moly hub is heat-treated for strength and durability. The lightweight, rigid design allows for quicker shifts and smooth, trouble-free service. With the 4-pad rigid race disc engagement is harsher, but shifting is faster. The 4-pad rigid race disc is well-suited for the smaller disc sizes in smaller engines. Monoloc is a one-piece, direct replacement or upgrade to the standard, two-piece wedge collar and wire ring featured in pull-type clutches. The spring tension of the segmented retaining ring is carefully calculated and tested for optimal performance. It provides uniform loading on the bearing and pressure plate to assure proper alignment, regardless of driver influence or vehicle modifications. Monoloc's hardened chrome-moly steel construction will provide years of service.
Kit contents
- SB019 - ACT Heavy Duty Clutch Pressure Plate
- 4240018 - ACT 4 Pad Rigid Race Clutch Disc
- AT90 - ACT Clutch Alignment Tool
- RB601 - ACT Clutch Release Bearing
- PB1004 - ACT Clutch Pilot Bearing
Specifications
- Product weight (lbs.): 15.9
- Torque capacity (ft/lbs.): 668
- Torque capacity over OE: 88%
- Disc material: Ceramic
- Clutch disc diameter (in.): 9.4
- Clutch disc diameter (mm): 240
- Input shaft diameter (in.): 1
- Pressure plate type: Heavy Duty
- Warranty: 12 months
Characteristics
- Feel: Light to moderate pedal effort, aggressive engagement, increased gear rattle, confidence during hard shifts
- Life: Moderate friction life, extended by ACT's exclusive diaphragm design, dramatic improvement in release mechanism life, rigid design may increase spline wear
- Quality: Carefully engineered, precisely assembled, accurately balanced, uses select ceramic friction materials for high heat tolerance and maximum performance, major improvement in release mechanism
- Recommended Use: Recommended for race use only
- ACT Difference: 100% clamp load tested and dynamically computer balanced for smooth high RPM reliability, includes ACT's patented Monoloc
Fitment
- 2004-2014 Subaru Impreza WRX STI (Limited 2007, 2011-2014; Special Edition 2010)
- 2013-2021 Subaru WRX STI (Base 2013-2021; Limited 2015-2021; Sport-tech 2013-2014, 2017-2021; Sport 2017-2021; special editions)
- 2007-2009 Subaru Legacy GT spec.B
- Subaru Impreza WRX STI [JDM] 2002-2005
Q: Best race clutch kit for a 2004-2021 Subaru WRX STI?
A: The ACT SB10-HDR4 Heavy Duty Race Rigid 4 Pad Clutch Kit with Monoloc is recommended for race use only and fits 2004-2014 Subaru Impreza WRX STI (Limited 2007, 2011-2014; Special Edition 2010) and 2013-2021 Subaru WRX STI (Base 2013-2021; Limited 2015-2021; Sport-tech 2013-2014, 2017-2021; Sport 2017-2021; special editions incl. Type RA 2018).
Q: Does the ACT SB10-HDR4 clutch kit include a Monoloc for a 2004-2021 Subaru WRX STI?
A: Yes. It includes ACT Monoloc, a one-piece, direct replacement or upgrade to the standard, two-piece wedge collar and wire ring featured in pull-type clutches.
Q: What comes in the ACT SB10-HDR4 clutch kit for a 2004-2021 Subaru WRX STI?
A: It includes SB019 - ACT Heavy Duty Clutch Pressure Plate; 4240018 - ACT 4 Pad Rigid Race Clutch Disc; AT90 - ACT Clutch Alignment Tool; RB601 - ACT Clutch Release Bearing; PB1004 - ACT Clutch Pilot Bearing.
Q: Will the ACT SB10-HDR4 fit a 2007-2009 Subaru Legacy GT spec.B?
A: Yes. It fits the 2007-2009 Subaru Legacy GT spec.B. It also fits the JDM Subaru Impreza WRX STI 2002-2005.
Q: Is the ACT SB10-HDR4 clutch kit meant for street or race use on a 2004-2021 Subaru WRX STI?
A: Recommended for race use only. Feel: light to moderate pedal effort, aggressive engagement, increased gear rattle, confidence during hard shifts.
Q: How much torque does the ACT SB10-HDR4 hold vs a stock 2004-2021 Subaru WRX STI clutch?
A: 668 ft/lbs. torque capacity, 88% over OE.
