Removing the flywheel and clutch helped to make the drivetrain lighter and more compact-the crazy rev-building ability was a fringe benefit. Von Koenigsegg says his team was never focused on engine pickup speed. I had high expectations, but it really blew my mind in terms of engagement level and reaction, how it just does exactly what you want immediately.” It’s really nice, motorcycle-like tight gearing. “On top of that, with nine gears, you have super short ratios. “We can use the gearbox to force the engine to change rpm quicker, which you cannot do with synchros,” von Koenigsegg says. A double-tap of the gear selector automatically downshifts you to the lowest possible gear at whatever speed you're traveling, for maximum acceleration.īecause of how the gearbox works, there’s no need for rev-matching, either. In the Jesko, you can shift from any gear directly into any other gear, nearly instantaneously. The wildly unconventional transmission design allows for capabilities never seen before in road cars.
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Instead of a conventional clutch mechanism between engine and transmission, the Lightspeed gearbox has seven wet clutches inside its aluminum housing, plus an eighth for the electronically-controlled differential. The gearbox, dubbed Lightspeed, has nine forward gears it’s integrated with the engine block, weighs 198 pounds, and can handle more than 1100 lb-ft of torque. That’s wild, and as far as we can tell, an all-time record for road car engines.īut the Jesko has no flywheel, no clutch, and no synchronizers in its transmission. Today, Koenigsegg’s data shows that the company’s latest V-8 has an average pickup speed of 31,700 rpm per second, with peak pickup registering at a nearly unbelievable 46,000 rpm per second in the middle of the engine’s rev range. The last time the topic came up, it was over a decade ago, with the glorious Yamaha-built V-10 that powered the Lexus LFA-a car that required a digital tachometer to keep up with its free-revving engine, which could go from idle to 9000 rpm in 0.6 seconds, a pickup speed of 15,000 rpm per second.
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It’s a stat that most automakers don’t care to publish. “Engine pickup speed” is the rate at which an unloaded internal combustion engine can gain rpm. But according to founder Christian von Koenigsegg, that wasn’t even a goal that engineers had in mind when they made this engine. The 5.1-liter twin-turbo V-8 that powers the Koenigsegg Jesko might just be the fastest-revving engine ever installed in a production road car.