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We are also able to supply Quaifes version of the Automatic Torque Biasing Helical LSD differential, this is an after-market differential that provides smooth, constant traction for racing or slippery road conditions.
Suitable as an ideal replacement for any front, rear or four wheel drive application, this ATB Helical LSD differential has the added benefit of no adverse effect on the steering of a front wheel drive vehicle. Quaife ATB Helical LSD differentials have been used in a wide array of applications, from Formula 1 cars to emergency and public utility vehicles, where all weather mobility is essential, and where the product must perform in the most demanding of conditions.
The characteristics of the differential are that it progressively locks as torque increases; there are no plates or clutches to wear out, unlike the more conventional limited-slip designs.
Quaife Engineering also offer their ATB Helical LSD differential with a limited lifetime warranty [see terms and conditions supplied with the product], as a demonstration of the quality of the product.
The decision whether to fit an ATB (automatic torque bias) or a Limited Slip differential may be assisted with some further info on the "function" of the two types.
The ATB supplied by Quaife and Ashcroft have 6 planet gears on each side but the Truetrac only has 3 on each side.
The diff is fitted with sets of "helical" gears sitting in pockets within the diff, the helical gears are unsupported so as they work together they generate friction against the sides of the pockets, the amount of friction is determined by the helix angle and preload on the gearset. In a situation where one wheel has less grip than the other there is a tendancy for this wheel to spin. Due to the friction within the internal gearset and the configuration of the gears the wheel which has retained grip can still drive "but" the torque transmitted to the "driver" will be proportional to the torque transmitted by the "slipper" this is the ATB effect and can be up to 2:1 ratio.
The only down side is if the "spinner" has no grip ie torque transmitted is zero the ATB will effectively multiply this by 2 giving zero. If the car has some form of traction control there will always be torque applied to the "spinner" i.e by traction control which is then enhanced by the ATB giving double the torque to the "driver" . We stock the Quaife Diff to fit the Rover type 24 spline diff.
Note : Due to the nature of the ATB diff we do not recommend the vehicle is brake tested on rollers, ask for a decelerometer to be used instead.