Study: Aggressive Acceleration Good for Battery Life

[JamboF4]

I just read a Car and Driver review / road test on the R1T Tri motor. The acceleration numbers make me think we need to bring back the 0-100-0 test that the Cobra made famous.

Any volunteers? (It's good for your battery!)

Haha…it’s the 100-0 part that’s gonna’ suck!

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[UnsungZero_OldTimeAdMan]

Haha…it’s the 100-0 part that’s gonna’ suck!

Might not be as bad as you think. While there is no data online on stopping distance from 100 mph, there is data for 60 mph. And it's 116 ft. Motor Trend got even better results with their gen 2 quad tester, 107 ft. The stickier Pilot Sport S5 clearly played a part.

 

[JamboF4]

Might not be as bad as you think. While there is no data online on stopping distance from 100 mph, there is data for 60 mph. And it's 116 ft. Motor Trend got even better results with their gen 2 quad tester, 107 ft. The stickier Pilot Sport S5 clearly played a part.

Well “physics is physics”. Hauling down 7200 lbs even with fairly massive discs, is still a damned tall order. I would like to see some data as well. In the meantime, I brake early and a panic stop will be assisted by whatever is in front of me! Haha

 

[UnsungZero_OldTimeAdMan]

Well “physics is physics”. Hauling down 7200 lbs even with fairly massive discs, is still a damned tall order. I would like to see some data as well. In the meantime, I brake early and a panic stop will be assisted by whatever is in front of me! Haha

Of course. But still might not be as bad as you might think. Rivian gave us big brakes to match the weight. More leverage and more surface area to dissipate heat.

 

[blturner]

Well “physics is physics”. Hauling down 7200 lbs even with fairly massive discs, is still a damned tall order. I would like to see some data as well. In the meantime, I brake early and a panic stop will be assisted by whatever is in front of me! Haha

The primary physics here is:
Traction = Coefficient of Friction * Weight

While the added weight does take more energy to stop, the weight also adds traction in exactly the same proportion. Yes it gets more complicated than that, but that is the biggest factor by far till the wheels slip. So we are not automatically going to have a far longer stopping distance. Let me know if you need me to dig up the math.

 

[thrill]

While kinetic energy is proportional to the square of the relative velocity difference, a constant coefficient of friction in stopping a vehicle with four times the kinetic energy (twice the relative velocity) will result in doubled stopping time as depletion of that energy also follows the squared relationship (assuming no brake fade), however the stopping distance will be quadrupled.

 

[riverie]

"Simplify and add lightness". Colin Chapman

OK, maybe that is not a Rivian philosophy.

 

[JRock]

While kinetic energy is proportional to the square of the relative velocity difference, a constant coefficient of friction in stopping a vehicle with four times the kinetic energy (twice the relative velocity) will result in doubled stopping time as depletion of that energy also follows the squared relationship (assuming no brake fade), however the stopping distance will be quadrupled.

Wait, what?

 

[blturner]

While kinetic energy is proportional to the square of the relative velocity difference, a constant coefficient of friction in stopping a vehicle with four times the kinetic energy (twice the relative velocity) will result in doubled stopping time as depletion of that energy also follows the squared relationship (assuming no brake fade), however the stopping distance will be quadrupled.

I stand half corrected. I knew there was a square in there but the lighter car also suffers from the square so I discounted it. But as I think more about it you're probably right. Doubling the weight of the vehicle doubles the traction but the energy is squared. This would result in double the stopping distance not quadruple. And the Rivian does not actually weigh double other trucks, but it does weigh more than double most vehicles that you would run 0-100-0
If I were not late for work I would Google this and provide a link. Maybe tonight.

 

[s4wrxttcs]

Officer i was only conditioning my batteries!

Back in my day Cops did actually give out "Display of Speed" tickets or at least warnings.

I got pulled over once for this due to my behavior at a stop light where I floored it right in front of the cop.

I tried to explain that I wasn't displaying anything. That's just what I did on occasion and this time he just happened to be behind me.

Fast forward to today and I can't see how this kind of ticket could be given out with all the EV owners out there OPTIMIZING stop light efficiency.

 

[s4wrxttcs]

Let me know if you need me to dig up the math.

ChatGPT are you there?

 

[Eeyore]

I prefer to call it spirited or enthusiastic driving rather than aggressive driving which can have a negative connotation.

I'm a spirited driver just sounds better.

 

[CD4Complex]

Might not be as bad as you think. While there is no data online on stopping distance from 100 mph, there is data for 60 mph. And it's 116 ft. Motor Trend got even better results with their gen 2 quad tester, 107 ft. The stickier Pilot Sport S5 clearly played a part.

I had a guest in the car that almost suffered whiplash both starting and stopping… .
so I can confirm the other comment on big brakes. (Yes, I also deleted the incident video before my wife got into the truck…)

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