FITS: Mk1, Mk2, Mk3 8v with 4 or 5-speed 020 trans
The Wavetrac® differential uses a patent pending design to improve
grip in low traction conditions. Precisely engineered, converging / diverging
wave profiles are placed on one side gear and its mating preload hub. As the two
side gears rotate relative to each other, each wave surface climbs the other,
causing them to move apart. This imparts an increased normal force through the
side gears, increasing the bias ratio as a function of load. This increase
occurs automatically only when conditions find it necessary, and it 'reverts'
back to its nominal bias ratio quickly and seamlessly, maintaining optimal
drivability and performance at all times. It's like having two differentials in
one: you get the benefit of a higher bias ratio when needed without detriment to
the car's handling.
Interchangeable Friction Plates Provide Controlled Bias
Here's something else you won't find in any other design:
The Wavetrac® diff's behavior can be altered in the field
to suit your needs. It comes standard with carbon-fiber bias plates for the best
all around performance. Interchangeable plates using materials with different
friction coefficients to fine-tune the bias ratio are sold separately.
These friction plates provide a mechanism to tune the response of the
differential as a function of applied torque load. The applied torque load
manifests itself as an axial load from the differential pinions into the
housing. This axial force is then considered a normal force into the friction
plate, and as a function of the effective coefficient of friction, will provide
a resistive torque to the rotational motion of the differential pinions. The
resistive torque will add to the resistance of relative rotation of all
components within the differential. The resistive force, however, is non-uniform
since it is a function of the axial load from the differential pinions. The
unbalance of the resistive torque will manifest as non-uniform energy absorption
within the differential causing a bias ratio.
Superior Design, Materials, and Construction
Designed from a clean sheet, the new Wavetrac® Differential brings current
gear technology to the market. Internally, its gear tooth forms are optimized
for strength and improved oil film retention over competitive designs. Our gear
package is smaller, reducing overall mass, yet is more durable. Attention was
also paid to the side gear/axle interface, putting as much material thickness as
possible in this critical area - most important when power levels get high.
Each Wavetrac® Differential is crafted from the highest quality materials
available. The internal gears are made from high strength 9310 alloy steel. The
diff bodies are machined from case hardened steel billet. To complete the
package, every Wavetrac® differential is built exclusively using high quality,
high strength fasteners from ARP®, the world leader in fastener technology.