Top speed limited

[freakyguy666]

How many of the naysayers want to wager that Tesla will eventually raise the top speed limit?….cue the crickets!

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[JBee]

How many of the naysayers want to wager that Tesla will eventually raise the top speed limit?….cue the crickets!

To what speed? 131mph?

The electric motors have such a high gearing 15:1 they are already doing 18,000rpm at that speed, which is at the top end for a non-CF wrapped electric motor. It's not a power problem, it's a rotor expansion problem at that rpm.

 

[freakyguy666]

To what speed? 131mph?

The electric motors have such a high gearing 15:1 they are already doing 18,000rpm at that speed, which is at the top end for a non-CF wrapped electric motor. It's not a power problem, it's a rotor expansion problem at that rpm.

Yes 131 is higher so that would qualify as an “increase”.

 

[JBee]

Yes 131 is higher so that would qualify as an “increase”.

Lol I stand corrected sir.

What's you point? Do you want it to go faster, or do you just want to post stuff to get a response?

I don't mind having a conversation with you about something in a detailed or meaningful way.

But 1mph is not my speed.

 

[freakyguy666]

Lol I stand corrected sir.

What's you point? Do you want it to go faster, or do you just want to post stuff to get a response?

I don't mind having a conversation with you about something in a detailed or meaningful way.

But 1mph is not my speed.

No problem buddy.
Answer to your question: point being the top speed may in fact be raised without necessarily exceeding the physical limitations.

 

[JBee]

No problem buddy.
Answer to your question: point being the top speed may in fact be raised without necessarily exceeding the physical limitations.

How would that be done?

By changing the gear ratio which would result in slower acceleration times, worse offroad and towing torque, and possibly put the motors out of their normal driving efficiency band and create excessive heat?

These things are not linear even on a electric motor. These are hard physical limits determined by the material properties and centripetal expansion of the rotor and the rotor air gap, which impact both losses and performance, along with power factor and torque, as the air gap is only around 0.2mm, so not large in the first place.

The design method would be:
1) make motor rpm operate at max efficiency at expected and most effective cruise for best range for pack size
2) gear for low end torque for off-road and towing uphill, and possibly weight for acceleration
3) end up with a decent useful top speed for a truck

If you think they haven't reached the upper limit with a non-CF wrapped motor, please feel free to state what those reasons are.

 

[freakyguy666]

How would that be done?

By changing the gear ratio which would result in slower acceleration times, worse offroad and towing torque, and possibly put the motors out of their normal driving efficiency band and create excessive heat?

These things are not linear even on a electric motor. These are hard physical limits determined by the material properties and centripetal expansion of the rotor and the rotor air gap, which impact both losses and performance, along with power factor and torque, as the air gap is only around 0.2mm, so not large in the first place.

The design method would be:
1) make motor rpm operate at max efficiency at expected and most effective cruise for best range for pack size
2) gear for low end torque for off-road and towing uphill, and possibly weight for acceleration
3) end up with a decent useful top speed for a truck

If you think they haven't reached the upper limit with a non-CF wrapped motor, please feel free to state what those reasons are.

The reason is precedent. Prior Tesla vehicles were thought to be at the limit only to receive firmware updates improving performance. No reason to believe Tesla has no room for improvement here.

 

[Rutrow]

 

[REM]

CyberTruck is geared for low end torque and speed limited to minimize the number of motors that spin themselves apart during the 8 year warranty period. I expect that Tesla will be selling speed boost upgrades eventually, and unless they uncork higher top speeds, police agencies aren't likely to buy any. Cyber PD vehicles will get left in the dust at 130.

CyberTruck will employ a lot of new tech that will prevent most high speed chases in the first place (statistically speaking). They just need to have extreme torque and acceleration and, of course, the CT will be perfect for that.

This tech isn't really out in the wild that much yet. Waiting for the platform that can actually deploy it.

 

[REM]

I wonder how many other people besides me understand the software locked speed boost is merely a hedge that Tesla makes against paying out a warranty claim due pushing the QC limits of the electric drivetrain.

It's a super smart way to give your stuff real field testing.

 

[JBee]

The reason is precedent. Prior Tesla vehicles were thought to be at the limit only to receive firmware updates improving performance. No reason to believe Tesla has no room for improvement here.

The acceleration boost option had nothing to do with the limits of the battery and motors. Both the motors and batteries are the same as the MY Performance, in that case they were just software limited.

This whole software neutering thing is dumb anyway.

I don't have a problem paying for extra software functionality, like buying a new program for my PC, or FSD, but intentionally reducing the performance of already existing hardware, that the customer has bought, like Apple made popular, is a big nono in my book.

However, if through collected operational data they see that more performance is available without impacting reliability, then sure I would be happy to see incremental improvements over time as the data becomes available and things get dialed in.

In this case it's pretty clear that the AWD is software neutered to 113MPH so the CB has a "perk" with a higher 130mph limit. This has nothing to do with the extra power available from the third motor though.

For reference CT needs:
25kW to go 70mph
82kW to go 113mph
125kW for 130mph
297kW for 160mph
393kW for 200mph.

Even the Single motor with the "right gearing" could do 160mph the AWD easily 200mph and more.

But as mentioned previously the batteries will then become the limiting factor, and won't sustain those power levels for long, regardless of the amount the motors can do.

 

[JBee]

I wonder how many other people besides me understand the software locked speed boost is merely a hedge that Tesla makes against paying out a warranty claim due pushing the QC limits of the electric drivetrain.

It's a super smart way to give your stuff real field testing.

Exactly.

This is why the Tesla dual motor rears are rated at 400kW peak, 160kW for 12minutes, but ONLY 45kW continuous.

All Teslas are "overdriving" their "underspecced" continuous rating until they bounce of the thermal limits of something in the system. Be that motor windings, inverter, battery temperature.

This is also why you don't see them cruising around over 120mph on German autobahns...for very long.

They only have "peak performance" for short stints, but are actually slower than most 2L Turbo diesels over distance at high speed.

Watch the performance fade inside of minutes, on the first non-Plaid runs at Nurburgring.

That is the peak performance everybody is buying with the non Plaid version Teslas you see driving around. Not one ounce more.

The Plaid can only sustain it longer now because of the better cooling...not because it has better motors.

 

[CyberGus]

Hauls 3500 lbs.
But we need 4000 lbs or it’s not a real truck!

Tows 11,000 lbs.
We need 14,000 lbs or it’s not a real truck!

Has 6’ bed.
We need 6.5’ bed or it’s not a real truck!

Top speed of 113 mph.
We need 150 mph or it’s not a real truck!


I love this forum… y’all make me feel like I’m an optimist now lol

 

[JBee]

E=mc2.... the faster you go, the more energy there is.

Not sure what mass to energy conversion has to do with maximum velocity, unless you are planning on making a large hadron collider.

But the point of my statement is in fact very valid, if you consider the fairly poor braking performance seen so far on the Cybertruck.

It is in fact the sudden stop that is lethal and not at all the top speed of the vehicle, that is important to consider here.

In the case of where the CT goes up against the Lambo SUV, the CT is still going some 35mph whilst the Lambo has already come to a complete stop.

This is not because the CT has a higher top speed Than the Lambo, rather the CT has a significantly lower top speed than the Lambo, and is why it is not further ahead in the quarter mile in comparison to the Lambo.

In this scenario the Lambo would brake to a stop before even making contact with an obstacle, with no panel damage at all.

Whilst the CT would impact the obstacle with 35mph and suffer a write off type collision, and also full airbag deployment with potential injuries as a result.

Any modern vehicle can reach a lethal top end speed, but unless you are in Germany with open limts on autobahns designed for high speed travel, most drivers drive around the much lower legal limits, so the top speed becomes even less relevant, especially in comparison to the impact velocity as a result of having poor braking performance, as demonstrated above.

Also we survive travelling several time faster than this just fine in passenger aircraft with better safety than ground based vehicles.

So its not speed that kills like is popular nanny state mantra regurgitation.

I'd like to see them focus more on bad vehicle maintenance, brake and trye performance instead.

So accordingly there is no correlation between the 'possible' vehicle top speed and resulting impact velocity, or subsequent forces that cause injury.

Hence:

It's not the speed that kills you, it's the sudden stop.

 

[REM]

Hauls 3500 lbs.
But we need 4000 lbs or it’s not a real truck!

Tows 11,000 lbs.
We need 14,000 lbs or it’s not a real truck!

Has 6’ bed.
We need 6.5’ bed or it’s not a real truck!

Top speed of 113 mph.
We need 150 mph or it’s not a real truck!


I love this forum… y’all make me feel like I’m an optimist now lol

At least we have big BAWs ¯⁠\⁠_⁠(⁠ツ⁠)⁠_⁠/⁠¯

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