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Doug996InKC says: This is an excellent kit for the money! Boost is very strong and linear, all the way up to redline. The instructions from VF Engineering are VERY outdated, thus, you'll need to use some ingenuity to c ..
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SPEC Aluminum Flywheel Audi S4 2.7L 99-02
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Price: $499.00   Sale: $464.07
  Model: SA26A
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The automotive component most responsible for insuring optimum clutch performance and life is the flywheel. The flywheel;s 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.

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. (sfi link)

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 car;s output and performance.
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About Manufacturer: SPEC Clutch
SPEC offers thousands of applications, seven stages of performance kits, up to eight stages of multidisc, stock appearing and billet lightweight clutches and the only flywheels on the market manufactured to a .001 machine tolerance.

SPEC Store | SPEC Clutches | SPEC Flywheels
SPEC Aluminum Flywheel Audi S4 2.7L 99-02 Reviews:
TEXT_OF_5_STARS Posted on 12/08/2009 by by Pat
"I am very pleased with my Spec aluminum flywheel. Recently installed this in my 01.5 S4 along with a stage 3 setup. I feel like the lightweight flywheel is an awesome upgrade for the S4 and increases the feel of the car alot, making rev matching easier and all around driving smoother. The car also revs nice and quick now. Get rid of that dual mass! The service from Vivid racing was awesome as well."


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