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SPEC Clutch: The Future of Fast

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It's a common misconception that when looking for a multi-plate carbon fiber clutch, the first thing you must do is run out and find yourself the best overseas aftermarket auto parts manufacturer cranking out clutches for your particular make and model.

While a whole host of after market auto parts manufacturer’s may offer long product lists and are well-positioned as carbon racing clutch suppliers, they are far from being the only game in town.

SPEC Clutch, a US-based designer and manufacturer of some of the most durable clutches on the market today don’t just blow smoke—they are more than willing to prove their products through testing on the bench or on the race track.

According to Dick Breakey, who recently installed a SPEC Stage 1 in his ’89 Mustang, “I love it. [Even though I’m] still in the break in period, I can already see how well it grabs. Even for a completely stock car this would be a great addition.”

The Alabama-based clutch and flywheel manufacturer is always working to stay ahead of the performance needs of the sports car market . In fact, just last month they announced new clutch and aluminum flywheel assemblies for the Subaru BRZ, Scion FRS, Toyota 3SGTE and Audi RS4.

Drivers looking for a multi-plate clutch assembly know what they are after; a no-nonsense clutch that is challenging to engage and can hold crazy amounts of power. There really is no other reason to run a multi-plate unless you are engaged in competition or have a high horsepower street car that sees a lot of track time.

“We developed a line of twin and triple plate carbon fiber clutches that debuted at SEMA '09” says Marketing Manager, Shelly Norton. “The need was there in the market because there are so many high horsepower cars needing low inertia and manageability.”

Carbon plates are generally considered to be superior to traditional materials for a number of reasons. The first being as soon as you install the clutch, it requires no break-in period. This is perfect for competition drivers, the lack of break-in (typically 500 miles of careful driving) means your car can get out there and shred up the track sooner, rather than later.

Carbon plates also don’t develop hot-spots because of their superior heat dissipation. Their resistance to heat means that they will clamp the same in competition and will not slip even under the most extreme conditions in high-horsepower cars.

For information on clutch basics from THMotorsports.net, click here.

SPEC Clutch Types Available At THMotorsports

SPEC Clutch Stage 1 
Types of Driving:

Street, Drag, Drift, Road Race, Rallye, Pulling, Autocross

Features an integrally molded carbon kevlar-based, high performance organic lining that offers smooth engagement and excellent life. This lining has an integrally bonded steel backing for strength under high clamp loads and temperatures. The hub is double sprung with spring cover relieves for flexibility and heat treated components for strength and durability. Best for street and many track/off-road applications.

  • High clamp pressure plate
  • Steel-backed and multi-compound woven organic material
  • High torque sprung hub and disc assembly
  • Bearing and tool kit
 
SPEC Clutch Stage 2
Types of Driving:

Street, Drag, Pulling, Autocross

Features segmented or full faced pure Kevlar disc with steel backing. This lining features excellent drivability like the stage 1, but offers slightly longer life and higher torque capacity. The hub is double sprung with spring cover relieves for flexibility and heat treated components for strength and durability. Best for street, drag, pulling and autocross.
  • High clamp pressure plate
  • Pure Kevlar friction material
  • High torque sprung hub and disc assembly
  • Bearing and tool kit
SPEC Clutch Stage 2+
Types of Driving:

Street, Drag, Pulling, Autocross

Features a multi-friction disc in a full faced configuration with carbon semi-metallic on one side and Kevlar on the other. Bridging the gap between stage 2 and stage 3, the 2+ offers drivability and engagement quality characteristic of the stage 2, but with a 15-20% higher torque capacity. The hub is double sprung with spring cover relieves for flexibility and heat treated components for strength and durability. Great for street, drag, autocross, road racing, pulling, rallye and drift.
  • High clamp pressure plate
  • Hybrid Kevlar and Carbon-Graphite Friction material
  • High torque sprung hub and disc assembly
  • Bearing and tool kit
SPEC Clutch Stage 3
Types of Driving:

Street, Drag, Pulling, Autocross

Features a carbon semi-metallic 6 puck sprung hub disc that has been the leading puck clutch in drivability, life and torque capacity. This unit is designed for street and race cars that require an aggressive but streetable engagement and high torque capacity. The hub is double sprung with spring cover relieves for flexibility and heat treated components for strength and durability. Also available in 3 puck configuration. Great for street, drag, road racing, pulling, rallye and drift.
  • High clamp pressure plate
  • Carbon-Graphite Friction Material
  • High torque sprung hub and disc assembly
  • Bearing and tool kit
SPEC Clutch Stage 3+ 
Types of Driving:

Street, Drag, Pulling, Autocross

The flagship stage for a high powered street or race car that requires a manageable and friendly engagement, the stage 3+ features a carbon semi-metallic full faced material that offers unparalleled life, friction co-efficient and drivability characteristics in one single package. The hub is double sprung with spring cover relieves for flexibility and heat treated components for strength and durability. Great for street, drag, drift, autocross, road racing, pulling, rallye and drift.
  • High clamp pressure plate
  • Carbon semi-metallic friction material
  • High torque sprung hub and disc assembly
  • Bearing and tool kit
Stage 4: Types of Driving:
Street, Drag, Pulling, Autocross

This unit is a solid hub version of the stage 3. The hub is solid 8-rivet and the assembly is heat treated for strength and durability. It is available in a 3, 4 or 6 puck configuration. Use the 3 puck for the lightest option or the 6 puck for the smoothest engagement. The 4 puck is a good compromise for both. Street drivable in 6 puck configuration, but not street friendly due to the rigid hub. Best for drag racing, road racing, pulling, rallye and drift.
  • High clamp pressure plate
  • Carbon-Graphite Friction Material
  • High torque solid hub and disc assembly
  • Bearing and tool kit
SPEC Clutch Stage 5
Types of Driving:

Street, Drag, Pulling, Autocross

Features a full-metallic disc with the highest possible friction co-efficient. Street drivable but not street-friendly. The hub is solid 12-rivet and the assembly is heat treated for strength and durability. Best for extreme street and drag racing.
  • High clamp pressure plate
  • Full-metallic friction material
  • High torque solid hub and disc assembly
  • Bearing and tool kit

 
 

Installation Guide

If you're a racer—or even if you’ve even dreamed of hitting the track—you know that the clutch is the vital linkage between the engine and the transmission. If you don’t have it installed or adjusted correctly, you can lose horsepower and wear out the clutch prematurely.

It’s always important to remember that attention to detail, thorough examination, and replacement of all worn clutch system components can eliminate immediate off-the-lift problems and prevent premature clutch failure. Remember, it's always important to follow manufacturers' guidelines for clutch removal and replacement as each car can create unique challenges. The guide below will walk you through the steps of installing a SPEC clutch in a C1 Corvette.




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