SPEC Clutch/Flywheel Descriptions, Install and Warranty FAQ

Stage One
These clutches are great as a replacement for the stock clutch, and engage as smooth with stock-like daily drivability, but are much higher quality with very good wear characteristics. They are also good for high performance street driving, or light drag strip action for bolt on naturally aspirated and mildly modified forced induction engines. The kit comes with a high clamp pressure plate, steel-backed and multi-compound woven organic clutch disc with a high torque sprung hub and disc assembly, bearings and a tool.

Stage Two
These clutches are great for all mild to moderately modified naturally aspirated and power adder engines, but also good for stock power levels and spirited driving when good daily drivability and extremely long life are the goal. With the Kevlar disc, these clutches are much stronger than a stock clutch, and virtually as smooth when shifting with stock-like daily drivability and EXCELLENT wear characteristics. The kit comes with a high clamp pressure plate, segmented chatter-free pure Kevlar clutch disc with a high torque sprung hub and disc assembly, bearings and tool.

Stage Two Plus
These clutches are great for all moderately modified naturally aspirated and power adder engines making more torque than the Stage 2 can support. The Stage 2+ offers great daily drivability and very good wear characteristics, but provides a higher torque capacity while maintaining Stage 2 feel. The kit comes with a high clamp pressure plate, composite multi-friction carbon-Kevlar clutch disc with a high torque sprung hub and disc assembly, bearings and tool.

Stage Three
ULTIMATE STREET/STRIP CLUTCH!
Great for extreme street driving and medium to heavy drag strip use on heavily modified street and race engines. The Stage 3 clutch kit is a great solution for a high powered vehicle and has good wear characteristics under low and high stress usage, while still retaining the ability to shift sharp but with comfortable pedal feel and quick engagement. The kit comes with a high clamp pressure plate, 4 or 6 puck carbon semi-metallic clutch disc with high torque sprung hub and disc assembly, bearings and tool. The Stage 3 clutches come standard with a 6 puck disc on most applications, but a 4 puck disc can be specified when ordering.

Stage Three Plus
THE BEST STREET CLUTCH POSSIBLE!
The perfect option for extreme street driving and heavy drag strip use on heavily modified street and race engines making more torque than the Stage 3 can support. The Stage 3+ clutch kit offers good daily drivability and better manageability than the Stage 3, with even better wear characteristics, it is the best clutch made by SPEC for high powered street driven vehicles. The kit comes with a high clamp pressure plate, full-faced carbon metallic clutch disc with high torque sprung hub and disc assembly, bearings and tool.

Stage Four
We recommend these clutches for serious drag/road racing purposes since they engage instantaneously and are not comfortable for every day driving. The kit comes with a high clamp pressure plate, 3, 4 or 6 puck carbon semi-metallic rigid 2-piece clutch disc with high torque rigid hub and carrier assembly, bearings and tool.

Stage Five
SPEC's strongest clutch is made specifically for drag racing high powered vehicles or applications that call for a slipper clutch/progressive torque-induced engagement. They feature an unsprung, rigid, iron disc that engages instantly and strongly. The kit comes with a high clamp pressure plate, iron disc, bearings and tool.

Lightweight Option
SPEC's Lightweight Option can be added to almost any clutch for an additional $79. The lightweight version reduces the weight of the pressure plate by about 25%. This will increase rwhp by decreasing the rotating mass of your driveline, allowing power to transfer to the wheels more efficiently.

Aluminum Pressure Plate
SPEC manufactures aluminum pressure plates for many applications. These pressure plates are designed for OEM fitment, but can be used with an array of transmissions and flywheels. The benefit of the aluminum pressure plate is comparable to gains from a lightweight flywheel, and in most cases is less costly. For years lightweight flywheels have been used to transfer energy from an engine to the ground more efficiently, resulting in wheel horsepower and torque gains, quicker revving and less internal engine wear. The SPEC aluminum pressure plates offer the same benefits, and the reduction in mass is more effective since the pressure plate extends further from the crank flange. These plates can be used with an OEM flywheel or in conjunction with a lightweight flywheel for a more drastic improvement. Drivability is virtually unchanged, and the aluminum plates offer the same high clamp loads, and in some cases more clamp load, than the standard steel SPEC high performance pressure plates. SPEC uses only aerospace quality aluminum and fasteners and most SPEC aluminum pressure plates carry SFI certification. This option can be added to any clutch kit stage on the following applications: Ford Mustang 10.5 and 11inch, LS1/LS2/LS6 Chevy, all other V8 Ford and Chevy models, most Chrysler/Dodge/Plymouth V8 models, Mazda Miata 1.6 and 1.8L, B-Series Honda, Nissan SR20DET RWD, Nissan KA24, Nissan Skyline push type, Nissan Maxima, and Dodge/Mitsubishi 420A.


Multi-Disc Clutches
Super Twin
The Super Twin is for street and track use in cars with extreme horsepower and torque (700-1500 ft lbs tq). The Super Twin offers near-stock drivability, tremendous life expectancy, a no shimming/setup bolt-in installation and maintenance free operation. With all billet construction, these units are smooth and quiet. The units are rebuild-able by SPEC or the end user and replacement components or rebuild services are always available. The super twin is constructed with aircraft grade aluminum and high carbon billet steel milled to an industry leading .001 inch for perfect balance and actuation. Friction is provided by dampened, full-faced carbon graphite discs. Organic, fiber and full metallic options are available. Flywheel and track-spec hardware are included in each kit. Types of driving: street, drag, drift, road racing, time attack, pulling and rallye.

Mini Twin
Multi-disc clutch and flywheel assemblies for limited street, drag race and road race applications. The Mini Twin assemblies are available in different clutch disc and flywheel materials, clamp loads, disc configurations and diameters which are recommended based on the type of usage the vehicle demands. The units are rebuild-able by SPEC or the end user and replacement components or rebuild services are always available. SPEC manufactures to an industry leading one thousandth of an inch for perfect rotational properties and concentric actuation, which optimizes balance, drivability and life. Types of driving: limited street, drag, drift, road racing, time attack, pulling and rallye.

SPEC Flywheels
SPEC flywheels are CNC manufactured at an unheard-of .001 tolerance, in an industry where the standard is .010. This precision manufacturing process ensures perfect balance and a perfectly flat bedding surface for the clutch disc, both of which also contribute to the ultimate in safety for competitive environments. All SPEC flywheels carry SFI certification. SPEC billet steel and billet aluminum flywheels are recommended as replacements for OEM cast steel flywheels in street high performance and racing applications. Both the steel and aluminum SPEC units are rebuildable and feature a replaceable steel friction plate that is made from a friction-enhancing steel metal specially formulated for optimum clutch bedding and holding power. The aluminum and steel materials provide a light and medium weight option for all types of racing. Your engine, gearing and vehicle weight are factors in determining which flywheel would be best suited for your application. Please email or call for recommendations.

SPEC BILLET STEEL Flywheels
SPEC billet steel flywheels are machined from the highest quality materials and exceed SFI safety standards for high rpm racing applications. They are precision ground to mate perfectly to the crank with minimum run out and provide a true and reliable surface to mate with the variety of friction materials we offer. They are recommended for heavy vehicles in a drag racing application and for mildly modified street/strip cars.

SPEC BILLET ALUMINUM Flywheels
SPEC billet aluminum flywheels are also CNC machined and exceed SFI standards for high stress racing applications. These units are recommended for highly modified street or racing vehicles, and for mildly modified street cars that can benefit from reduced rotating mass without the loss of daily drivability. Please email or call for recommendations on your specific needs. The body of the flywheel is made of tempered aluminums, either 6061 T6 or 2024 T3, for ultimate strength and lightest possible weight. The 1/4 inch thick friction plate is a 1050 high carbon alloy, for incredible durability with any friction disc material, even iron. The plates are secured to the body by aerospace fasteners or stainless steel rivets, depending on the application. These fasteners were chosen because of their exceptional strength and corrosion resistance. The ring gears are pressed on and secured with grade 10 fasteners. The gear is also heat treated for longevity. They are effective, durable and almost too pretty to install!


Clutch Install Info

Unless using a new flywheel provided by SPEC, existing unit must be resurfaced prior to installation of the clutch product to ensure integrity of friction surface. Owner must also break in the new high performance clutch for a minimum of 500 miles, primarily city and/or stop-and-go driving, before full throttle engagement, drag launching or power shifting.
Failure to properly install and break in your clutch will create chatter and slipping, plus it will void the manufacturer's warranty.
Unless otherwise instructed by written notice from SPEC, follow manufacturers instructions when installing clutch and flywheel products. SPEC recommends that all bolts be inspected before re-installation, and any bolts that have been removed and re-torqued multiple times should be replaced.


Limited SPEC Warranty

SPEC is the only clutch manufacturer which will actually guarantee the torque numbers listed. If you break you clutch and you have less than the torque number listed for your clutch, SPEC will replace you clutch free of charge, even if you broke the clutch drag racing, launching on slicks, at 6,000 rpm, as long as the install and break-in instructions above are followed.
S.P.E.C., Inc warrants all products to be free of defects in materials and workmanship for normal use and service up to 120 days after retail purchase. SPEC reserves the right to examine any part returned for warranty claim to determine whether a defect in materials or workmanship exists in such product. SPEC liability is limited to repairing, replacing or crediting towards other product, and credits will not exceed the invoice total for the parts. Labor and storage charges are not products of SPEC and, therefore, will not be reimbursed for any reason. Final determination of the condition and suitability of the parts for uses contemplated by the buyer is a sole responsibility of the buyer. SPEC and The Racers Edge Performance will not be liable for any damage or injury to persons or property that might be claimed as a result of improper installation or misuse of any part subject to this warranty.
There are no warranties expressed or implied beyond those set forth above.