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Part number: SF50S-9
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Product Details
Spec Clutch SF50S-9 SPEC Flywheel - Steel
Steel Flywheel

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.

The automotive component most responsible for insuring optimum clutch performance and life is the flywheel. The flywheels contribution to power transfer is three-fold.

Firstly, the flywheel should provide a consistent and friction enhancing surface for the clutch disc. Flywheels also aid in proper inertia, which is determined by the flywheel weight. Inertia controls the ratio of power to acceleration and can make a vehicle faster or slower based on gear ratio, tire type, vehicle weight, power output and even the location in the powerband output is achieved. The weight of a flywheel and amount of inertia it provides can also effect drivability. Lastly, the flywheel must provide a true balance at rpm, which means no dimensional runout that produces engine damaging and power robbing vibrations and allows smooth engine revolutions.

To allow for specific inertia needs, SPEC flywheels are made in high carbon billet steel and aircraft quality billet aluminum. The aluminum and most steel 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. SPEC spends a lot of time and effort on research and development of optimum flywheel dimensions and weights for all types of driving and racing and can optimize your MOI (moment of inertia) to maximize your cars output and performance.

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I recently ordered 2 Borla Dual Round Intercooled Tips from Autoplicity.com for one reason and reason only...their prices can not be beat! No where else online can anyone match them!
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Picture was different then real product had to call to confirm fitment and was giving good answers.
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good so far
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AWesome service. questions answered immediately via chat and order was en route via fed ex within 6 hours!!!!!!
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Fitment
Audi 90
1995 Audi 90 CS
1994 Audi 90 CS
1993 Audi 90 CS
1992 Audi 90 CS
1991 Audi 90 CS
1990 Audi 90 CS
1989 Audi 90 CS
1988 Audi 90 CS
Ford Mustang
2013 Ford Mustang Boss 302 / GT
2012 Ford Mustang Boss 302 / GT
2011 Ford Mustang Boss 302 / GT
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