It doesn't make sense

[dml105]

maintaining speed and coasting are different things

OKay, so we're clear, when you say coasting, you ARE trying to slow down, correct?

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[astronut325]

Question: Is it better to use regen or coasting coming down a mountain road?

 

[daemonic3]

Question: Is it better to use regen or coasting coming down a mountain road?

I think phrasing it as one OR the other is tripping people up. I'm not saying you're tripped up, but some on the thread seem to be.

Let's agree coasting = No throttle applied, intrinsic drag only

Regen = THE SAME INSTRINSIC DRAG plus generator drag, so it slows you even more

Going down a hill you will be using BOTH unless you flip it to neutral and use exclusively friction braking, as pointed out earlier.

I believe now that at least one member is assuming that the energy regenerated by the regen braking is MORE than the sum of the generator's own drag plus the intrinsic drag. That was leading to the conclusion that "choosing" regen instead of coasting eliminates the intrinsic drag of coasting. But if the drag the generator adds is less than the energy it recaptures, or we should all use 2 feet to drive and constantly use both pedals floored to create infinite energy.

The infinite energy car was already invented though:

 

[Av8tor]

Whisper

 

[Mach1E]

Question: Is it better to use regen or coasting coming down a mountain road?

Answer: yes


With the Mach E, it’s not “regen vs coasting.”

In all modes whether you hit the brake, use 1PD or are in engage or unbridled, it will use regen. And all modes when not accelerating nor decelerating will coast.

A better question would be “whisper or unbridled” or “2PD or 1PD.”

The answer is- how you drive makes the difference, NOT the mode.

But it’s easier to drive more smoothly and coast more in whisper.

Sorry- whisper

 

[Socalsp3]

OKay, so we're clear, when you say coasting, you ARE trying to slow down, correct?

no quite the opposite, its trying to go as far as possible and accelerating and braking as little as possible

 

[dml105]

no quite the opposite, its trying to go as far as possible and accelerating and braking as little as possible

We were so close.

Ok. During the part where you are actually coasting, you’re trying to slow down, right?

 

[ctenidae]

maintaining speed and coasting are different things

You said it's tricky in 1PD to not accelerate and not brake, which means you can't maintain your speed. I think that inability is odd.

If you can hold your foot right to not accelerate and not brake (aka maintaining speed), you should be able to lift it enough to decelerate at the same rate as coasting, effectively simulating coasting (aka slowing down without engaging regen).

Agreed?

 

[ctenidae]

I believe now that at least one member is assuming that the energy regenerated by the regen braking is MORE than the sum of the generator's own drag plus the intrinsic drag.

Entirely incorrect.

If you are coasting, you are slowing down. Friction, drag, etc.

If you need to slow down more than coasting, you should use regen.

The initial claim was that coasting is more efficient than using regen, which is a false claim.

If you are regularly coasting to a stop, using only friction to reduce your speed to 0, you have a very odd driving style, and live in an area with no traffic and long, straight, and level approaches to stop signs, with no traffic or other variable obstacles.

If you live in the real world, you will generally need to slow down more quickly than coasting. At which point you should use regen, not friction brakes. In that world, physics operates in such a way that energy can be neither created nor destroyed.

If anyone doesn't agree with this, we need to come up with a clearer definition of coasting, I guess.

 

[ctenidae]

But it’s easier to drive more smoothly and coast more in whisper.

Sorry- whisper

True, but it's not nearly as much fun!

I don't like the throttle mapping in whisper, and I think the steering is too twitchy in Engage, so I've settled on the weightier steering and tighter throttle mapping of Unbridled.

The car is still a zillion times more efficient than my old BMW 650, even with the clutch in and coasting.

 

[Socalsp3]

Entirely incorrect.

If you are coasting, you are slowing down. Friction, drag, etc.

If you need to slow down more than coasting, you should use regen.

The initial claim was that coasting is more efficient than using regen, which is a false claim.

If you are regularly coasting to a stop, using only friction to reduce your speed to 0, you have a very odd driving style, and live in an area with no traffic and long, straight, and level approaches to stop signs, with no traffic or other variable obstacles.

If you live in the real world, you will generally need to slow down more quickly than coasting. At which point you should use regen, not friction brakes. In that world, physics operates in such a way that energy can be neither created nor destroyed.

If anyone doesn't agree with this, we need to come up with a clearer definition of coasting, I guess.

It's situational not either or. You want to coast when you want to go. You want to Regen when you have to slow or stop.

 

[ctenidae]

Coasting IS slowing.

 

[Mach1E]

Coasting IS slowing.

Yup.

But it’s slowing “more slowly.” Basically driving like a grandma, which is why it’s more efficient.

The only thing I can figure out in this argument is that people are talking right past each other because they aren’t saying the same things when they define “coasting.”

 

[Mach1E]

snip



The initial claim was that coasting is more efficient than using regen, which is a false claim.

If you are regularly coasting to a stop, using only friction to reduce your speed to 0, you have a very odd driving style, and live in an area with no traffic and long, straight, and level approaches to stop signs, with no traffic or other variable obstacles.

If you live in the real world, you will generally need to slow down more quickly than coasting. At which point you should use regen, not friction brakes. In that world, physics operates in such a way that energy can be neither created nor destroyed.

See? I think this is where the confusion lies.

No one is saying “coast plus friction brakes is more efficient.”

No one.

“Coasting” equals no brakes. Slowing down very slowly. I.E. “whisper mode.”

The only way to coast and use friction would be in neutral. And again…… no one is recommending neutral!

And then I’ll repeat myself…… you can coast and drive this way (grandma style) in ANY mode. It’s just harder.

whisper.

But again, your claim that regen and coasting are equally efficient is false. It’s as simple as the fact that regen has efficiency losses. Coasting to a stop is more efficient. But that’s because of “grandma” driving style. But I think it’s only “false” because we appear to be defining “coasting” differently.

 

[mkhuffman]

See? I think this is where the confusion lies.

No one is saying “coast plus friction brakes is more efficient.”

No one.

“Coasting” equals no brakes. Slowing down very slowly. I.E. “whisper mode.”

The only way to coast and use friction would be in neutral. And again…… no one is recommending neutral!

And then I’ll repeat myself…… you can coast and drive this way (grandma style) in ANY mode. It’s just harder.

whisper.

But again, your claim that regen and coasting are equally efficient is false. It’s as simple as the fact that regen has efficiency losses. Coasting to a stop is more efficient. But that’s because of “grandma” driving style. But I think it’s only “false” because we appear to be defining “coasting” differently.

Yeah, this argument is ridiculous. If you read between the lines, everyone is in agreement. Everyone agrees that regen has efficiency losses, and everyone agrees that slowing down and speeding up requires more energy than maintaining a constant speed. Everyone. And everyone agrees that friction brakes are less efficient than regen brakes. Everyone.

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