Cybertruck vs Lamborghini Urus: DRAG RACE

[JBee]

Am I going to have to school you on tires and brakes too? Not to mention the 50% more mass? Mud terrain tires will never beat dedicated street performance tires, no matter how strong the brakes.

The Cybertruck has anti-lock brakes strong enough to bring the contact patches of the tires to the limits of traction. After that the only advantage of more powerful brakes is the ability to do repeated stops without fade. Since the braking test was only from 70 mph (and only one stop), we can be sure the problem was not inadequate brakes.

Let's keep it real.

Really?

Well supreme teacher of fanboi flap your gums in the wind, how do you explain this at the 16min mark?



Hummer is another ton heavier than the CT and it still brakes in a shorter distance.

And its a GM! (I know right, what has the world come too! lol)

Tyres are even "more" AT:

And even if it were the tyres and not the CT brakes, and you could blame it on Goodyear, then why on earth is Tesla installing such crap in the first place??

CT braking like that is actually a joke, like a banana peel down a glacier, it can seemingly accelerate faster than it can brake in less time in the video, so it's not the tyres. In comparison it's still going over 25mph when the Lambo is already stopped given the difference in distance in the Lambo video.

So there's either a problem with the ABS tuning, or the brakes aren't worn in, or they are just significantly under dimensioned. Or any combination of the three.

Better be sorted before I get mine otherwise the first thing I'm going to do is rip those brakes out and put some real ones in.

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[JBee]

Regen has absolutely no effect on braking distance unless the brakes are woefully undersized.

So although the brakes are meant to be able to brake without regen, there's no reason to think that the regen was disabled in these brake test, and didn't assist in the braking distance, especially at the faster speeds, and given the high gearbox ratio of the CT.

 

[cvalue13]

But the brakes are not so hilariously shocking. The difference is way to much, that's not just the tyres.

yeah man

they just. don’t. do. brakes.

which is a key piece of speed.

 

[CactusPilot]

Is it due to the braking limitation that the Beast is limited to 130mph?

Freaking, Sandy missed the opertunity to ask so many more useful questions from Elon.

 

[JBee]

yeah man

they just. don’t. do. brakes.

which is a key piece of speed.

Well on a windy track you can win the race with better brakes.

Watch how F1 brakes are used, Only full on or full off. If you miss your braking points you lose, because any time you are not accelerating, at top speed, or braking as hard as you can, the more time you loose.

Another reason why Plaid struggles around Nurburg, and why they upgraded it with the track version brakes.

 

[JBee]

Is it due to the braking limitation that the Beast is limited to 130mph?

Freaking, Sandy missed the opertunity to ask so many more useful questions from Elon.

No. Top speed would be limited due to the higher gearing of the electric motors, so they have amply low down torque for off-road and towing. No point making a faster truck, just gives you headaches when tying to place the cruise in the most efficient motor rpm band to get max range.

There's something wrong with the brakes on that particular CT, I'm fairly sure.

 

[HaulingAss]

Better be sorted before I get mine otherwise the first thing I'm going to do is rip those brakes out and put some real ones in.

See, you totally missed the point. The brakes on the Cybertruck can totally lock the wheels up if the software in the anti-lock control unit would let them, so it's not the brakes and ripping them out for better or bigger ones will not change your emergency stopping distances at all.

What could improve the braking is fine-tuning the software that runs the anti-lock feature. The Cybertruck in both videos was a pre-production unit. Tesla fine-tuned the brake software in the Model 3 shortly after it was released and Consumer Reports claimed sub-par performance and, after an OTA update, the issue was fixed. It took Tesla about 2-3 days if I recall.

The point you are missing is emergency stopping distance has nothing to do with the brakes in a modern car and everything to do with tires and software algorithms in the anti-lock control unit. Putting more powerful brakes on there won't change the stopping distances one inch! That's a common misunderstanding.

This has nothing to do with me being a fan of Tesla and everything to do with physics.

By the way, the Hummer has a lot more tire on the road with those 305/70R18's vs. Cybertrucks 285/65/R20's so I hardly find the few feet that the Hummer stopped shorter to be significant, especially considering the Cybertruck was a pre-production unit in that video as well.

By bringing the Hummer into it you are deflecting from my main point, the Lamborghini stopped in a much shorter distance, primarily because it has performance road tires on it. It has nothing to do with the brakes themselves. End of story.

Oh, and that rust and dent resistant exoskeleton sure looks sweet, eh?

 

[cvalue13]

No. Top speed would be limited due to the higher gearing of the electric motors, so they have amply low down torque for off-road and towing. No point making a faster truck, just gives you headaches when tying to place the cruise in the most efficient motor rpm band to get max range.

There's something wrong with the brakes on that particular CT, I'm fairly sure.

I don’t think there’s anything particularly wrong.

this truck has basic, Tesla, hydraulic brakes

the Urus weighs 2,000 lbs less, but is outfitted with the largest brakes ever on a production car (440mm X 40 in front, and 370 X 30 in back), all carbon-ceramic, produced in-house, under 21” rims. It goes from 100 kilometers per hour to a full stop in only 33.7 meters.

Because if you’re Lambo, and care about more than straight-line launch speed, you don’t skip leg day.

Vs

It’s always been a complaint of mine RE Tesla: so much emphasis on tech around going fast, and so little around getting slow.

That they’d ever produce a MS Plaid that could be that fast, and brake that poorly, is to me a glaring indictment.

And nothing we’ve seen about the Cybertruck, which weighs 2,000lbs more than a Uris, suggests Tesla has improved its priorities.

“But regen” is a response relevant, at best, to a normally-accelerating car.

It’s a response that is irrelevant to the proposition of the Plaid or Cyberbeast.

Big ‘skipping leg day’ energy.

 

[SentinelOne]

685lbs of torque is quite a bit lower than I expected. Still amazing machine but I certainly expected tq to be very close if not higher than the hp

100% agree, seems very low...hopefuly we get a dyne from an early delivery...find out the true numbers vs. sandbagging!

 

[JBee]

See, you totally missed the point. The brakes on the Cybertruck can totally lock the wheels up if the software in the anti-lock control unit would let them, so it's not the brakes and ripping them out for better or bigger ones will not change your emergency stopping distances at all.

What could improve the braking is fine-tuning the software that runs the anti-lock feature. The Cybertruck in both videos was a pre-production unit. Tesla fine-tuned the brake software in the Model 3 shortly after it was released and Consumer Reports claimed sub-par performance and, after an OTA update, the issue was fixed. It took Tesla about 2-3 days if I recall.

The point you are missing is emergency stopping distance has nothing to do with the brakes in a modern car and everything to do with tires and software algorithms in the anti-lock control unit. Putting more powerful brakes on there won't change the stopping distances one inch! That's a common misunderstanding.

This has nothing to do with me being a fan of Tesla and everything to do with physics.

By the way, the Hummer has a lot more tire on the road with those 305/70R18's vs. Cybertrucks 285/65/R20's so I hardly find the few feet that the Hummer stopped shorter to be significant, especially considering the Cybertruck was a pre-production unit in that video as well.

By bringing the Hummer into it you are deflecting from my main point, the Lamborghini stopped in a much shorter distance, primarily because it has performance road tires on it. It has nothing to do with the brakes themselves. End of story.

Oh, and that rust and dent resistant exoskeleton sure looks sweet, eh?

You are not only a joker, but a physics jester.

So now it's "NOT" the tyres, and it's the "ABS" settings like I suggested?

How fast can you flip your brain burger?? You change your mind more often than I change my socks. ?

BTW the larger contact patch of a tyre does NOT mean it has better grip. Let alone that the Hummer tyres have bigger gaps, and weighs a ton more, which more than exceeds any "perceived" benefit of having bigger tyres, if there was actually one.

Traction is determined by downforce and coefficient of resistance, which means the compound and the interaction of that force plays per square inch of contact patch is the most important.
Bigger is not always better, the USA can't make up physics laws either, try as they might.

This is easy to demonstrate, in that a huge contact patch steel wheel is going to do much worse than a tiny little rubber one. At a not distant point of operation, increasing the tyre patch area reduces the amount of braking force as the rubber looses the downforce per square inch of contact patch required for best braking performance. Remember from kindergarten, pressure is force over area, so if you increase the area you reduce the force.

 

[SentinelOne]

Hope the Cyber Beast has bigger/better Brembo's on it for production units!

 

[cvalue13]

You are not only a joker, but a physics jester.

but but Cybertruck wear cape infallible unimprovable!

 

[JBee]

I don’t think there’s anything particularly wrong.

this truck has basic, Tesla, hydraulic brakes

the Urus weighs 2,000 lbs less, but is outfitted with the largest brakes ever on a production car (440mm X 40 in front, and 370 X 30 in back), all carbon-ceramic, produced in-house, under 21” rims. It goes from 100 kilometers per hour to a full stop in only 33.7 meters.

Because if you’re Lambo, and care about more than straight-line launch speed, you don’t skip leg day.

Vs

It’s always been a complaint of mine RE Tesla: so much emphasis on tech around going fast, and so little around getting slow.

That they’d ever produce a MS Plaid that could be that fast, and brake that poorly, is to me a glaring indictment.

And nothing we’ve seen about the Cybertruck, which weighs 2,000lbs more than a Uris, suggests Tesla has improved its priorities.

“But regen” is a response relevant, at best, to a normally-accelerating car.

It’s a response that is irrelevant to the proposition of the Plaid or Cyberbeast.

Big ‘skipping leg day’ energy.

This is mostly true.

I agree that the Lambo has much better brakes configuration, and potentially even better tyres in comparison.

But this does not account for the braking distance delta.

There is something else that is off for it to be that much. That's nearly 50% longer than the Lambo if it's only 33m from 100kmh. That's towing territory, and with a trailer this thing will stop like a train.

All I'd need is an accurate braking time and we could work everything out. That video makes it look like 5seconds, which is way to long, and is caused by the video editing. Just need a cab view with speedometer and time whilst they do a full brake.

 

[JBee]

but but Cybertruck wear cape infallible unimprovable!

So if that is true with the Lambo that it can stop in 33m from 100kmh, it has a coefficient of friction of 1.19, which is really good, Porsche level good in fact. F1 is 1.4-1.7 with super glue tyres.

That means at 70mph it needs 42m (137ft) to stop.

Now if we say CT stopped 33ft further in the video at a total of 170ft total we get coefficient 0.95.
CT would stop in 42m from 100kmh.

It also means the CT is still doing 50kmh/31Mph, and nearly half of the speed still, when the Lambo is already stopped.

FYI That would make the Hummer 0.99 and 40m from 100kmh.

All around poor except for the Lambo of course.

 

[HaulingAss]

Hope the Cyber Beast has bigger/better Brembo's on it for production units!

That would be very useful on a racetrack but it wouldn't stop the truck any faster in an emergency stop because the limiting factor is the coefficent of friction of the tires on the pavement.

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