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Old 02-12-2012, 12:41 AM
MCSL MCSL is offline
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Xtrac IndyCar Gearbox

The latest type ‘1011’ transmission is a completely new gearbox for the 2012 Dallara DW12 chassis that offers a smaller, lighter and more efficient design fully integrated into the car’s improved rear crash structure, which will make a major contribution to increased driver safety.

Xtrac and Dallara worked closely to ensure the design of the gearbox complemented the new car and is fully compatible with all three turbocharged engines supplied by Honda, GM and Lotus. Xtrac similarly consulted with IndyCar and all the race teams to understand what they wanted from a new transmission and has incorporated many of the features requested. A feature that everybody wanted to carry over from the previous transmission was the ultra-reliable and successful MegaLine assisted gearchange mechanism, which is further integrated into the new gearbox and now powers an auto clutch anti-stall system.

The ability to changeover very rapidly from one set of gears to another to provide different ratios for different circuits has also been carried over into the new design, and it is now possible to swap between ovals and street circuits without needing to touch the crown wheel and pinion. Moreover, increased differential adjustment allows teams to further fine tune the chassis from one course to another.

An initial batch of 75 gearboxes has been manufactured to ensure sufficient cars and spares for the start of the 2012 season. Extensive use of sophisticated computational analysis and rig based testing was essential to ensure the gearbox is fit for purpose, even prior to any major endurance track tests. The gearbox is assembled at Xtrac’s expanded US facility, which is only 10 minutes from the famous Indianapolis Motor Speedway, and the company has been heavily involved in the winter test program for the new racecar to validate the new gearbox design and confirm its reliability.

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