I Was Wrong – Why The Koenigsegg Regera Has No Transmission

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Why The Koenigsegg Regera Only Needs One Gear Ratio
Koenigsegg Regera No Trans Part 1 – https://youtu.be/wYvIY6lBTjY
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The original video (link above) is partially incorrect. It is not correct to add resistance to the normal force on the rear tires to determine if the wheels can spin. A vehicle sitting stationary in strong headwind could still do a burnout (assuming the headwind doesn’t create a bunch of downforce). The only thing that matters for spinning tires is whether or not you can exceed F = u*N (the maximum force the tires can apply, based on available traction). N, however, gets a bit complicated, and is dependent on at least four factors: 1. Weight distribution. 2. Load transfer due to acceleration. 3. Downforce on the car. 4. Load transfer due to wind resistance. Ignoring aerodynamics, the vehicle needs to exceed a rear wheel force of 2368.7 lbs (10.54 kN) to spin the tires, regardless of vehicle speed. Because the engine alone can create 90% of this force at 100% throttle at 5300 RPM (engine speed at 160 mph), adding in electric motors will be more than enough to spin the tires at 160 mph, even accounting for downforce. The difference turns out to be about 1%, but it’s important that the conclusion is reached using the correct logic.

Why would Koenigsegg produce a vehicle without a transmission? Aside from the efficiency and weight benefits of having no transmission, the Regera can actually spin it’s tires when traveling as fast as 160-170 mph, meaning that any more aggressive gearing would provide no better acceleration for speeds up to about 170 miles per hour. Put simply, it has so much torque that aggressive gearing isn’t needed, and this video has the math to prove it.

The Koenigsegg Regera features a 5.0L V8 producing 1,100 horsepower, and three electric motors producing an additional 700 HP. Combined, the HP curves allow for a peak of 1,500 HP.

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