Everybody’s mad about Porsche’s dual-clutch PDK (Porsche Doppelkupplung) transmission. It’s instantaneous shifts provide precious milliseconds of performance advantage and make anyone who uses them feel like an F1 driver. But dual-clutch transmission aren’t perfect. They’re big, heavy, and complex. Racing transmission manufacturer Xtrac says it’s invented a lightweight, simple, and seamless transmission that can outperform dual-clutch units in every way. Their Instantaneous Gear Change (IGS) transmission uses a ratchet and pawl mechanism between each gear hub and the main shaft so that two consecutive gear ratios can be selected and engaged simultaneously, but with only one set of gears driving the wheels. The UK-based company says it’ll make the IGS available for automobiles, trucks, and motorcycles soon.
Xtrac is based in Berkshire, UK, with motorsport shops in Indianapolis and North Carolina. Its gearboxes, differentials, and driveline components are used in Formula One, IndyCar, Touring Car, Rallying, Rally Raid, GRAND-AM, and Le Mans sportscar racing. Xtrac say the IGS has been used for two years with professional racing teams.
“Car makers like to see practical demonstrations to show that the technology actually works and is more than a concept. With our motorsport experience we have the advantage of two years of racing IGS with professional teams.”
The Xtrac IGS will initially be used to increase the efficiency of electric car drive trains and will eventually end up in petrol and diesel-powered vehicles, says Xtrac.