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Choosing the Right Clutch

Race Twin Clutch Kits

ACT Race Twin Clutch Kit Features

  • All ACT Race Twin-Disc kits are SFI spec. 1.2 certified and are true bolt in kits with no modifications required.
  • Low moment of inertia for quicker engine acceleration and up to 50% weight reduction compared to stock.
  • Recommended for race use only
  • Rebuild kits available, unit is fully serviceable for cost effectiveness

Choosing the Right Clutch

Choosing the correct clutch for your application requires knowing the estimated torque your engine will produce. Once you have an estimate of the torque your engine is producing, we recommend choosing a clutch that will handle at least 10 percent over the torque output of the engine. Torque capacities indicated in the application chart are calculated from pressure plate tests performed at ACT’s facility.

Understanding ACT's Part Numbers

Understanding the ACT alphanumeric coding of our products will help as you look through what ACT offers for your application. Here is a quick reference of how twin-disc clutch kits are listed in ACT’s application chart and website.

Twin Disc Clutch Kits

Sample Part Number: T1S-G04

T
Twin Disc
Number of Discs

The first letter of the part number references the number of discs in the clutch kit. In this example, the “T” stands for Twin.

1
Pressure Plate
Pressure Plate
  • 1 - Heavy Duty Pressure plate
  • 2 - xtreme pressure plate
  • 3 - maxx xtreme pressure plate
S
Clutch Disc Type
Clutch Disc type
  • S - rigid-hub Street disc
  • R - 6-Pad, Rigid-hub disc
G
Vehicle Make
Vehicle Make

The vehicle make code is usually the first letter of the make and the first letter of the model the clutch kit is made to fit. In this example, the “G” stands for General Motors.

04
Application
Application

The application code is usually the numeric code of the model the clutch kit is made to fit. In this example, the “04” stands for XXXXXXXXX.

Pressure Plates

SP = SPORT PRESSURE PLATE

  • 10-30% clamp load increase
  • Stock to moderate pedal feel
  • Recommended disc type: Street

HD = HEAVY DUTY PRESSURE PLATE

  • 20-50% clamp load increase
  • Stock to moderate pedal feel
  • Recommended disc: Street / Race
  • Most popular choice

XT = XTREME PRESSURE PLATE

  • 40-120% clamp load increase
  • Moderate to stiff pedal feel
  • Recommended disc: Street / Race

XX = MAXX XTREME PRESSURE PLATE

  • 70-150% clamp load increase
  • Stiff to very stiff pedal feel
  • Recommended disc: Race

Performance Flywheels

STREETLITE FLYWHEELS

  • Most popular choice
  • Preferred for street & drag racing
  • Improved throttle response & acceleration
  • Considerably lighter than stock
  • Most durable ACT flywheel available
  • Good driveability

PROLITE FLYWHEELS

  • Preferred for road or rally racing
  • Quick throttle response & acceleration
  • Lightest with lowest inertia
  • Reduced driveability

PRO-MASS FLYWHEELS

  • Confidence-inspiring momentum over obstacles; no gear rattle.
  • Recommended for street and off-road use.

Street Clutch Discs

MM = MODIFIED STREET DISC

  • Recommended for street or occasional race use
  • Quicker engagement
  • Quiet operation
  • Improved friction material

SS = PERFORMANCE STREET DISC

  • Recommended for street & race use
  • Quicker engagement & operation
  • Improved hub and burst strength
  • Most popular choice

SD = RIGID HUB STREET DISC

  • Recommended for street / race use
  • Minimum weight for faster shifts
  • Quick engagement, smooth & precise
  • Ultra-high burst strength

Race Clutch Discs

G4 = 4 - PAD

  • Recommended for road racing
  • Increased torque capacity, good durability and spline life
  • Quiet operation, reduced driveline shock
  • Harsh engagement, chatter

G6 = 6 - PAD

  • Recommended for road racing & high-powered street racing
  • Increased torque capacity, good durability and spline life
  • Quiet operation, reduced driveline shock
  • Harsh engagement, chatter
  • Most popular choice

R4 = 4 - PAD

  • Recommended for drag & road racing
  • Increased torque capacity
  • Fastest shifts, low inertia
  • Good durability, but shortened spline life
  • Harsh engagement, chatter
  • Gear noise

R6 = 6 - PAD

  • Recommended for drag & road racing
  • Increased torque capacity
  • Faster shifts, reduced inertia
  • Very good durability, but shortened spline life
  • Harsh engagement, chatter
  • Gear noise

SINTERED IRON

  • Recommended for clutchless shifting, drag race transmissions only
  • Very high torque capacity
  • Extremely durable and heavy
  • Harsh engagement, chatter
  • Gear noise