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ACT Clutches and Flywheels - Automotive and Diesel Clutch Kits from ACT - Diesel Ops

ACT Clutches & Flywheels

Advanced Clutch Technology or ACT as most people know them have been specializing in sport compact & diesel trucks since 1994. Since then ACT has upheld a standard that is unparalleled in the aftermarket performance industry and has become well know for their outstanding customer service. Not to downplay their customer service at all, but that is nothing compared to the quality of their performance clutch kits for diesel performance and sport compact cars.


ACT Clutch kits have been designed and tested with only precision in mind. ACT has the philosophy that there is no new or old school quality, but there is only the right or wrong way to design, fit and test a clutch. ACT insists on using only on vehicle testing, Dynamometer results and laboratory testing, 3D modeling, Rapid prototyping and simulation to ensure 100% fitment and operation.

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Choosing the Correct ACT Clutch

The clutch transmits torque produced by the engine at the flywheel – not horsepower. It does not care about how much torque makes it through the transmission and differential to the tires. The only way to accurately measure engine torque is with an engine dynamometer. Since very few people are willing pull their engines out just so we can help them choose a clutch, either a chassis dyno or a realistic estimate is needed. This figure will usually be in pounds-feet (lb-ft). If given in Newton-meters (Nm), multiply by 0.74 to calculate lb-ft, as this product guide is based on lb-ft:

TORQUE (lb-ft) = 0.74 x TORQUE (Nm) For those with dyno data, engine torque will normally be somewhere around 15% higher than that measured at the wheels due to losses in the transmission, differential(s), wheels and tires. For AWD cars, the number is typically higher (up to 18%) with the additional friction losses. There are many variables related to the type of dyno being used, atmospheric conditions and the methods of the dyno operator. For the purpose of clutch selection, multiply the wheel torque number by 1.15 (RWD or FWD) or 1.18 (AWD):

ESTIMATED FLYWHEEL TORQUE = MEASURED WHEEL TORQUE x 1.15 [1.18 for AWD] If no dyno numbers are available, a reasonable torque figure can be estimated by qualified individuals familiar with your specific vehicle and the modifications it already has. If planning on more engine upgrades in the future, be sure to consider those before ordering. Bolt-on mods (intake, exhaust, cams, ignition and so on) generally increase horsepower with little torque improvement. Adding forced induction (turbo or supercharger) and/or nitrous oxide will substantially increase both torque and horsepower, so it is important to understand what effect future mods will have on clutch selection.
For some applications, clutch options can be selected to handle additional torque. Others require purchasing an entirely different setup for major gains. Even though there are only a few things in life more enjoyable than changing a clutch, we recommend making the best choice the first time around.

Use this guide to determine whether a Sport, Heavy Duty, Xtreme, Maxx Xtreme or Twin-Disc Kit upgrade is best for your vehicle. If racing or drifting, ACT offers race clutch kits for many popular applications. If you don’t see what you are looking for, call us to discuss custom applications. We have helped clients ranging from grassroots enthusiasts to internationally recognized professional drivers.