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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Comments

Asmir says:

The question is: If it can wheel spin up to 160 mph => it also can up to 62 mph (Obviously there is traction control to deal with that. With that said, as regera accelerates it should have enough power to be always at point of breaking the traction, which is the max force applied possible without spinnig the tires) => it should have max acceleration 0-62 mph possible, which is according to his previous video, about 2 seconds. Why isn't that possible?

Cool James says:

Damn. I just finished Primary school as a Year 7 and haven't even started High school and all of this maths is bombarding me.

Aditya Achary says:

Please use kmph

Jefferson Winfrey says:

You're doing too much, it has 1 gear because it has 1 gear.

realvanman1 says:

I would think that the greatest contributor to load transfer would be due to drive axle reaction torque.

John Burns says:

I believe the Koenigsegg Regera is a hybrid that eliminates a transmission because the electric motors step in.

Manick N says:

Great video. Thanks for correcting.

Ethan Wilson says:

Its alright we all make mistakes

frosty A B says:

Just because it does not have a box with gears in it does not mean that there is no transmission.

fourbypete says:

Seems legit.

AgentMCCityDE says:

This car must sound horrible when constantly driving in high RPMs

AgentMCCityDE says:

Agera R = RAgera ~ Regera

r0y02 says:

F=UN ?
Okay, I'll see myself out.

Jose Blanco says:

How can I buy that tee shirt????? My nephew is in engineering school.

SwaffyX says:

This is what happens when you put a minibike torque converter in a supercar. XD

Paul Morris says:

I'm curious are free valve engines applicable still?

Cops Suck says:

The Koenigsegg has no transmission? Then how does it move? Does it have sails?

trans·mis·siontranzˈmiSHən,transˈmiSHən/nounnoun: transmission
The mechanism by which power is transmitted from an engine to the wheels of a motor vehicle.synonyms:power train, drivetrain

Track Days MX says:

Hey. Little detail: weight transfer due to air resistance would be calculated versus height of center of pressure relative to ground, not to the center of gravity. And I wouldn't rule out weight transfer although the error introduced could be smaller than other assumptions.

SpiritofDaniel says:

However a properly designed transmission would be able to utilize much smaller Motors in less weight for even faster acceleration.

John Dalecki says:

Just when you think you have life figured out, a kid half your age drops this $h!t on you. I didn't need this today!

Kelly Jackson says:

Is his voice ever going to break? jesus lol

Mindbulletz says:

Since we're being particular, I still don't think this is 100% correct. Center of pressure being inline with the center of gravity, you'd still have to account for the load transfer required to keep the car at speed (at zero acceleration). If you don't have that power on the wheels and resultant load transfer, you would have negative acceleration.

Also I would be interested in what the torque curve of those electric motors are, plotted against the speed of the car instead of RPM of the motor, to get a clearer picture of what's happening at that speed. I'm curious because DC motors like they're probably using have 100% torque at 0 RPM and drop off as the RPM increases.

rideordieguy rideordieguy says:

just bad math????

Sander Kamp says:

Is center of pressure the same thing as center of mass?

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