Garry Posted August 10, 2006 Share Posted August 10, 2006 BBF Diffs for Rallycross Racers! The ultimate secret in the quest for perfection has arrived!!! More Steering, More Traction, More GRIP! We are very excited to be able to offer you the best kept secret in 1/8th scale Off Road Rally Cross Racing, the BBF Tactyl 2 light Differentials. These differentials are a significant improvement over standard differentials and are available in front, centre and rear units. They are available for: - Kyosho MP 7.5 & 777 - Mugen MBX4RR & MBX5 - XRAY XB-8 TQ - Hot Bodies Lightning 2 Pro & Sport - HoBao Hyper 7 & 8 - GS CL1 - Mantua Rally Race BBF Tactyl II Light differentials have already proved their massive handling and laptime advantages during prototype stage by winning the 2004 and 2005 1/8 Off-Road European Championships!! Functionality compared to other available differentials: Regular 4-gear 'spider' differentials These only have a fixed locking mechanism depending on the oil-viscosity used in the differential, regardless of either on-power or off-power situation. When thin oil is used, the wheels can spin free in corners (giving good grip) but as soon as one wheel is off the ground, all the power goes to that wheel and all acceleration/traction is lost immediately. When thick oil is used, the wheels cannot spin free in corners (less grip) but when a wheel is off the ground, a little bit of acceleration/traction is left. Conclusion: Always a compromise between grip and acceleration/traction, and never the best of both! Torsen differentials They can shift power to the wheel which has the best traction. In this way Torsen differentials do offer good acceleration as long as both tyres are on the ground. However, as soon as one tyre is off the ground, a Torsen differential will give all power to that wheel (like a standard spider differential) and all acceleration/traction is lost. And as soon as there are small bumps on the track (like most rallycross tracks), very often one wheel is off the ground and traction is gone! Conclusion: Never the perfect acceleration in off-road use! TACTYL II LIGHT DIFFERENTIALS The self-locking Tactyl II Light differential always provides maximum grip and acceleration/traction. Going through a corner off-power, the wheel spins completely free (as with a normal spider diff) so the tyres and suspension can provide maximum possible traction. This gives much better corner speed and more steering. When accelerating from very low rpm, the Tactyl II Light Differential mechanically self-locks, depending on the Torque Shell used (see below for Torque Shell explanation). Even if one wheel is off the ground, the Torque Shell transfers available power to the wheel which is on the ground, so the best possible acceleration is provided! Conclusion: You always get the best possible grip in corners and the best possible acceleration/traction when on-power!! TACTYL II Light diffs give you the advantage of a 4-gear spider diff and of a Torsen differential at the same time!!! General Tuning Information - There are 5 Torque Shells available that all fit front/centre/rear differentials and fit all the different makes of cars available - The higher the Torque Shell rating, the more forward ‘locking power' you actually get (on-throttle power) - The TACTYL II Light Front Differential comes with a 110 Torque Shell standard for maximum front traction and steering - The TACTYL II Light Centre Differential comes with a 70 Torque Shell standard for a controlled power application to both front and rear - The TACTYL II Light Rear Differential comes with a 30 Torque Shell standard for maximum rear grip and controlled acceleration - These standard settings proved to be the optimum settings for both grass tracks and dirt tracks in Europe - For high traction tracks when you can utilise more aggressive throttle input, moving to a 90 Torque Shell centre and 50 Torque Shell rear is recommended - BBF supply a perfect blend of Differential Oil which is the only type used by the Race Team, although extra tuning is possible with regular diff oils - These units are practically maintenance free as our top guys simply only refill the differential with oil every 2-3 meetings as normal maintenance Recommended Configuration - Tactyl II Light used in front and centre (minimum recommended configuration): the car is very easy to drive and follows the steering wheels - Tactyl II Light used in front, centre and rear (expert racer configuration): noticeable better acceleration, significantly reduced tyre wear and much better steering and agility...leading to faster laptimes!! Technical Specifications - Automatic mechanical self-locking system - Similar to 'Limited-Slip-Differentials' used in full-size race cars - Only the highest-quality materials are used - Adjustable traction (diff-lock) with different Torque Shells - Nearly no maintenance needed! - Very light: only 108g! - Increased and very consistent steering through on-power self-locking mechanism - Self-locking mechanism works equally at very low and very high rpm - Greatly increased cornering speed through free-spinning wheels when off-power - Significantly reduced tyre wear when Tactyl II Light is used in front, centre and rear Watch out for the UK BBF team at Nationals very soon! All details on part numbers and prices will appear very soon on the Mirage website. Source: Mirage. Quote Link to comment Share on other sites More sharing options...
madmanluke Posted August 10, 2006 Share Posted August 10, 2006 yum yum. might get me some of those if there not priced the wolrd over Quote Link to comment Share on other sites More sharing options...
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