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GM11-HDR4 - HD/Race Rigid 4 Pad

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Please use the above filters to find products for your vehicle. ACT can only guarantee fitment if the vehicle search is used.

Note: Must use ACT flywheel (included in kit).

was $1,200.00 Special Price $1,020.00
Availability: Out of stock
SKU
GM11-HDR4

Specifications

Specifications
Item Description HD/Race Rigid 4 Pad
Product Weight (lbs.) 21
Torque Capacity (ft/lbs.) 443
Torque Capacity Over OE 71%
Disc Material Ceramic
Clutch Disc Diameter (Inches) 9
Clutch Disc Diameter (Millimeters) 228
Input Shaft Diameter (inches) 1
Pressure Plate Type Heavy Duty
Flywheel Type Prolite
Warranty 12 Months (view details)

Description

GM11-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.

Description
Feel Light to moderate pedal effort, aggressive engagement, increased gear rattle
Life Moderate friction life, extended by ACT's exclusive diaphragm design, 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
Recommended Use Recommended for race use only
ACT Difference 100% clamp load tested and dynamically computer balanced for smooth high RPM reliability

Vehicle Fitment

Fitment Info
Application Engine
2005 Chevrolet Cobalt SS 2.0 L4 GAS FI | DOHC | Supercharged
2006 Chevrolet Cobalt SS 2.0 L4 GAS FI | DOHC | Supercharged
2007 Chevrolet Cobalt SS 2.0 L4 GAS FI | DOHC | Supercharged

Frequently Asked Questions

Are ACT clutches balanced?
Yes! All ACT clutch assemblies are computer spin balanced to within .25 oz-in to guarantee help smooth operation across the entire RPM range. For comparison, stock production clutches are typically balanced to within .50 oz-in. Lower is definitely better!
Will an ACT clutch increase pedal effort?
ACT pressure plates are specifically designed to handle high torque applications. With ACT's durable design, expect an increase in pedal effort between 15-40% (Heavy Duty) and 50-80% (Xtreme), depending on the application. Clutches developed with less pedal effort often result in a lack of longevity, torque capacity and/or engagement quality.
Do ACT clutches require a break in period?
For organic street discs, we recommend breaking in the clutch for 300-500 miles with mild engagement, such as stop-and-go city driving prior to racing or spirited driving. ACT race discs usually only require a few hard slips to lap in the surfaces prior to normal driving or racing. Do not overheat the clutch during the break in period, as this can result in friction surfaces fusing together, hot spots, and friction surface glazing.
Are ACT clutches repairable or rebuildable?
In some situations, rebuilds or repairs may be possible (see warranty), after inspection of the clutch assembly. Please contact our technical department for further information. Because of special modifications, we do not recommend servicing by a general clutch rebuilder.
How much does an ACT clutch weigh?
The weight of the ACT clutch assembly will usually be the same as a stock OEM clutch assembly.