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The project involved the design, manufacture and assembly of a rear mounted, transverse gearbox. The resultant design allows gear cluster changes without disassembly of the rear of the car. Gear changes are performed using Xtrac's positive and reliable sequential gearchange mechanisms. Xtrac's legendary record for reliability and performance was built on multiple winning Le Mans record from products like this.
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This transmission represents an opportunity for Xtrac to combine its superior design and manufacturing skills with its experience of lightweight transmissions to fulfil all of the requirements of the Cross Country Rally Championship. |
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Drive is fed from the forward mounted ratio gears through a pair of quick change drop gears, mounted at the rear of the transmission, into the final drive spiral bevel gear set.
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This unit offers the proven reliability of Xtrac's high quality internal components, in a layout designed for ease of access and maintenance.
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Drive is fed directly into the ratio gears and out of the mainshaft in to a train of two pairs of drop gears and then into the 11:31 CWP. Gear changes are performed using Xtrac's positive and reliable sequential gearchange mechanisms.
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Drive is fed from Dakar proven gear ratios, into a hypoid final drive spiral bevel gear set, out via a differential to (935) flanges only 8.66" (220mm) wide. Value engineered to meet strict cost constraints within this formula, this gearbox offers the highest quality at a cost effective price.
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This is a mid-engine longitudinal transaxle and has been developed from Xtrac's successful and durable '105' Sportscar gearbox and is suitable for the Grand American Daytona Prototype Series. Drive is fed from Le Mans proven gear ratios mounted behind the axle centre line, through a final drive hypoid spiral bevel gear set. This allows the engine to be mounted low in the car, thus helping weight distribution without adversely compromising drive shaft angles, or efficiency. Value engineered to meet strict cost constraints within this formula, this gearbox offers the highest quality at a cost effective price. |
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A transverse six speed sequential racing gearbox, primarily designed for use in FWD Touring Car (BTCC) and Rally Car applications. The unit has been utilised as the specification gearbox for the British Touring Car Championship since 2001. The 406 was designed with ease of servicing in mind and ratio changes are accomplished on the bench after the ratio cluster has been removed as one unit on its cluster plate. Value engineered to meet strict cost constraints within this formula, this gearbox offers the highest quality at a cost effective price.
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The '407' is the low torque configuration in this new range of high performance in line gearboxes. This range also includes both mid and high torque versions, designed for sports car applications. Xtrac have used their knowledge and experience to produce this high quality yet lower priced range of gearboxes that shares common parts across the range. This enables spares to be both competitively priced and readily available.
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A transverse six speed sequential racing gearbox, primarily designed for use in FWD Touring Car and Rally Car applications. The unit is a re-package of the successful '406' FWD Touring Car gearbox, which has been utilised as the specification gearbox for the British Touring Car Championship since 2001. The new design gives a lower center of gravity, and the encapsulating cluster casting makes it easier to remove the cluster for ratio changes. Value engineered to meet strict cost constraints within this formula, this gearbox offers the highest quality at a cost effective price.
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The '427' is the mid capacity configuration in this new range of high performance gearboxes. This range also includes both higher and lower torque versions, designed for both sports car and touring car use respectively. Xtrac have used their knowledge and experience to produce this high quality yet lower priced range of gearboxes that shares common parts across the range. This enables spares to be both competitively priced and readily available. |
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The '429' can be used as a direct replacement for the '229' gearbox and allows maximum advantage to be taken of the latest ACO floor regulations. Its design allows gear cluster changes without disassembly of the rear of the car. Xtrac's legendary record for reliability and performance was built on multiple winning Le Mans records from products like these.
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The '437' is the high capacity configuration in this new range of high performance gearboxes. This range also includes both mid and low torque versions, designed for both sports car and touring car use respectively. Xtrac have used their knowledge and experience to produce this high quality, yet lower priced range of gearboxes that shares common parts across the range. This enables spares to be both competitively priced and readily available.
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The 516 makes use of reduced center distance F1 derived gear ratios to minimise the size and weight of the gearbox and to minimise inertia. The gearchange system incorporates the latest polynomial barrel track design and low inertia gearchange rack to improve gearchange response and driver feel. The low positioning of the gear cluster enables easy removal from the car under the chassis rail, and lowers the centre of gravity. The gear cluser is fully exposed when removed from the gearbox allowing quick inspection, and easy access for ratio changes.
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Xtrac have designed and developed a new differential for the Porsche 911 GT3R, as used by Dick Barbour and tested by Porsche at Weissach. We are able to offer this unit direct to customers for use in the 911 GT3R. The '213' Differential is an adjustable Negative Pre-load Differential (ANPD). Under light acceleration or deceleration levels, the differential will remain open, but as the torque transmitted increases, the force separating the side gears will increase, overcoming the negative pre-load effect of the Belleville springs and lock up the friction discs and plates. The characteristics of the differential can be tuned by changing either the ramp angles on the side gear rings, or adjusting the amount of negative pre-load via the adjuster plates. The adjustment can be carried out either on the bench or in the car. A small machining modification is required to allow the unit to fit into the existing Porsche casing. Xtrac can modify the casing or supply details for customers to carry out the machining themselves.
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 247
Heavy Duty DifferentialThe 247 Heavy Duty Differential is an independent unit designed for either front and/or rear drive applications, typically for Cross Country Rally Raid vehicles and Sportscars. Universal mountings allow the unit to be mounted for all shaft rotations and positions (front and rear). The oil system has been designed to operate in all possible orientations. These features combined with the unit's high quality, low cost attributes make this product ideal for a wide variety of endurance type events.
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This differential is for the current Lola Champ Car. It combines the best features of viscous, and ramp limited slip differentials, in one highly compact unit. As well as offering speed and torque sensing characteristic, the unit is also fully adjustable. Torque sensing is carried out by a conventional symmetrical ramp arrangement with many options available. Speed sensing is achieved using a Visco-Lok shear pump unit. The Visco-Lok's unit is fitted with a valve that controls the speed at which the pump will start to lock the differential. This can be used to keep the differential open in cornering, but locking when a wheel spins up. This unit offers the proven reliability of Xtrac's high quality components, combined with the unit's adjustability to give a truly competitive edge.
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The 407 Medium Duty Differential is an independent unit designed for either front and/or rear drive applications, typically for Rally, light Cross Country Rally Raid vehicles or Touring cars. It is the perfect differential to be used in conjunction with Xtrac's in-line 407 Sequential Touring Car gearbox. The unit incorporates high quality, low cost features making the product particularly suitable for Touring Car type events. For higher torque and more arduous environments, the heavy duty Xtrac 247 differential can be utilised.
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Driveshafts & Joints |
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Starter Motor Assembly |
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| The 420 in car gear lever is designed to be a low cost solution for use with Xtrac's sequential gearboxes. The lever supports universal installation, and is designed to link to gearboxes installed in the front or rear of the car, with the linkage mounted above or below the transmission tunnel. Included with the lever is a reverse gear detent lift handle. The lever is offered in two versions, a basic specification for manual shifts, and a power shift version with micro switches to provide an input signal to the ECU.
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Gear Lever Assembly
Potentiometer |
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Xtrac sequential gearboxes are generally fitted with sensors so they can be integrated into the cars management and telemetry systems. This is a new stand-alone product that can be fitted to our sequential transmission. It measures the gearchange barrel position to display the current selected gear to the driver. The device uses a state of the art microcontroller technology to give a reliable, lightweight unit that displays the selected gear on a high intensity LED display. The display incorporates a light sensor which automatically adjusts the display brightness to match the ambient light conditions, ideal for endurance racing. The unit is simple to install. All that is required are for connections to be made to the 12v vehicle supply and ground. The connections to the potentiometer are made using the high quality wiring harness supplied, which uses environmentally sealed automotive connectors. In addition, the unit is fully reverse polarity protected and cannot be damaged by incorrect wiring.
Xtrac are an official partner of Megaline and can offer their well proven Assisted Gear change System (AGS) as part of a comprehensive package to include Xtrac designed and developed peripheral components and full test and event support. We are also able to offer support on other pneumatic,
hydraulic and electrical systems.
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