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#355100 XRAY XB8 Active Diff™

The unique XRAY Active Differential is a high-performance, adjustable front gear differential for XB8 buggies… vastly improving the buggy’s speed and handling characteristics. The special design of the internal components using different angled segments allows the diff gears to engage on-power to increase the forward traction and stability to the buggy, making it faster and easier to drive.

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While the XRAY Active Differential is a performance option for serious racers who want to gain an edge on superior speed and handling, it is also of great benefit to any level of driver that wants to a more predictable and easy-to-drive car in any racing conditions.


The Active Differential has been long-term tested with great success in all different racing conditions, (including the European Championship and World Championship) by factory team drivers including Yannick Aigoin, Jon Hazlewood, and Josh Wheeler. Yannick Aigoin won the 2006 Euros and Oliver Simon won the 2007 Euros B, both of them with the Active Differential aboard their winning cars.

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On- and Off-power Action:

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Feature Descriptions:

• Lightweight Composite Diff Body click to enlarge
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Moulded from XRAY's own special composite mixture, the body will not expand when temperatures rise inside the diff. The diff body is hand-ground on a precision grinding machine to ensure maximum roundness, and features a molded-in hard steel diff outdrive ring with a high-tolerance, precision-ground inner hole to ensure super-free turning of the outdrives.

• Diff Outdrives click to enlarge
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The diff outdrives are CNC-machined on precision German long-turn machines and are manufactured from self-developed, world-renowned HUDY Spring Steel™ – the toughest steel material available. The diff outdrives are additionally ground and strategically lightened to reduce rotating weight. The diff outdrives are then further hardened to ensure maximum strength and longest lifespan. The diff outdrive shafts are additionally precision hand-ground to a very high tolerance to ensure an ultra-smooth tight fit in the diff body and diff gear.

• Internal Gears click to enlarge
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The internal gears of the Active Diff are die-cast and pressed from high-grade steel material using very high pressure to ensure a very strong core, and then are specially hardened to ensure minimal wear and longest life.

• Diff Gear click to enlarge
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The diff gear is machined from special HUDY steel material which has been specially developed for gear-type products, additionally hardened and precision ground to fit the tightest tolerance requirements for perfect fit with the diff outdrives. The gears are individually machined on a precision German gear machine and every gear is individually tested and inspected. The diff gear is then laser engraved with “Active 40T” for easy and instant recognition. An optional 38T gear is also available.

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• Active Diff Segments click to enlarge
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The Active Diff segments are CNC-machined from very tough steel, and have very precisely-machined “V” ramp grooves with different angles for easy engagement/disengagement adjustment. The segments are hardened to ensure high life. The Active Diff comes with standard with a 90° segment, while a 120° segment is available optionally.

Active Diff Action
The action of the Active Diff is easily adjusted using different internal segments: standard 90° segment, or optional 120° segment.

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