1 pedal driving and snow don't mix

[dtbaker61]

If it's icy 1PD/Whisper will still lock up if you fully lift off. It's better than Unbridled though.

It takes a really steady foot to find the balance of 0 power/regen..... if you lift completely in unbridled you get up to 100kW of braking power, which is similar to moderate/heavy foot on a brake in an ICE vehicle.

I was driving in snow last weekend up and down a mountain, and found it very useful to display actual kW power/regen on my phone so I could gauge the amount of braking going on. I really liked NOT having to move my foot from accelerator pedal to get light braking.

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[ctenidae]

It takes a really steady foot to find the balance of 0 power/regen.....

True - and gets to why I soooo prefer manual to automatic transmission. Clutch in = 0 delta-v. If you keep the wheel straight, it even works on ice.

 

[woody]

so....turning into a skid/slide and driving out of it does not work with the MME?
I have experienced anti-lock brake mode with "thumping" in other vehicles. Thought it was the way it was supposed to be - thought it replaced pumping (really old school).
Old school driving techniques worked last winter.
What's a poor boy to do?

 

[ctenidae]

so....turning into a skid/slide and driving out of it does not work with the MME?
I have experienced anti-lock brake mode with "thumping" in other vehicles. Thought it was the way it was supposed to be - thought it replaced pumping (really old school).
Old school driving techniques worked last winter.
What's a poor boy to do?

Turning into the skid still works, for sure (except on ice, where it never worked anyway). You might not be able to power slide out of it, but that only works about 0.024% of the time, anyway. At least, in ICE Mustangs...

There's no great leap between winter driving in an ICE and winter driving in an EV. Physics is physics. In the case of an EV, its computer probably understands physics better than you do, particularly on the fly. Hit a parking lot, and all will become quickly clear.

 

[ChasingCoral]

Been driving in an ice storm for the last day or so, I find one pedal gives me really fine control in very icy conditions.

Me, too. I like one pedal driving in icy conditions because it Is a much lighter touch for braking than using my foot on the brake pedal. If I have to slow the car, one pedal driving gives me more control and less susceptibility for fishtailing.

What mode are y'all using? I've always suspected 1PD Whisper would be best.

All good points. This was my first time driving it on ice, so I was unprepared. Plus it was in unbridled.

Definitely could be the issue because Unbridled yields a lot of braking as @dtbaker61 learned:

It takes a really steady foot to find the balance of 0 power/regen..... if you lift completely in unbridled you get up to 100kW of braking power, which is similar to moderate/heavy foot on a brake in an ICE vehicle.

 

[Blue highway]

I suspect that what catches people by surprise is that the regen (one pedal or two, it's exactly the same) is done through the rear wheels. The fronts don't have regen braking even on the AWD cars.

The "so what" is that braking is on the rear wheels until near max regen is reached and the calipers are blended in. If the rear wheels start to slip, you will feel it even as the ABS kicks in.

ICE car brakes are all front biased... On ice and snow when the front wheels skid even a little as the ABS kicks in, the car understeers. By contrast if the rear wheels skid first on ice (as is the case in the MME) the car will tend to oversteer. You will feel this as the ABS kicks in and catches it.

Whisper mode (one pedal or two) minimizes lift off regen braking and will offer the least surprises on snow and ice.

 

[johnmark]

I suspect that what catches people by surprise is that the regen (one pedal or two, it's exactly the same) is done through the rear wheels. The fronts don't have regen braking even on the AWD cars.

The "so what" is that braking is on the rear wheels until near max regen is reached and the calipers are blended in. If the rear wheels start to slip, you will feel it even as the ABS kicks in.

ICE car brakes are all front biased... On ice and snow when the front wheels skid even a little as the ABS kicks in, the car understeers. By contrast if the rear wheels skid first on ice (as is the case in the MME) the car will tend to oversteer. You will feel this as the ABS kicks in and catches it.

Whisper mode (one pedal or two) minimizes lift off regen braking and will offer the least surprises on snow and ice.

I did not know that - tysm for the explanation!

 

[snowy_91]

Been driving in an ice storm for the last day or so, I find one pedal gives me really fine control in very icy conditions.

Well, at least by day 3 it's turned to snow....

 

[johnmark]

Well, at least by day 3 it's turned to snow....

Love the contrast of the space white color against the snowy backdrop.

 

[snowy_91]

Love the contrast of the space white color against the snowy backdrop.

except that the car is Ice Blue....

 

[johnmark]

lol close enough?

 

[dbsb3233]

There's also a natural tendency to go into a split-second panic when suddenly sliding on ice when just doing a drive around town, and automatically lifting fully off the accelerator pedal. Which gets the full amount of regen slowing the drive mode delivers. Which is often too strong to keep tire grip on ice.

When such conditions exist, I would think a low regen mode would be desired. Has anyone published a relative regen kW (full liftoff) table for each drive combo (mode + 1/2PD + D/L) at a set MPH?

 

[ctenidae]

There's also a natural tendency to go into a split-second panic when suddenly sliding on ice when just doing a drive around town, and automatically lifting fully off the accelerator pedal. Which gets the full amount of regen slowing the drive mode delivers. Which is often too strong to keep tire grip on ice.

When such conditions exist, I would think a low regen mode would be desired. Has anyone published a relative regen kW (full liftoff) table for each drive combo (mode + 1/2PD + D/L) at a set MPH?

More useful would be the computer's reaction time between lift off, wheel slip, and regen reduction. I'll go ahead and give you a decimal point and a handful of zeroes to use. Then compare that to a human's reaction time.

 

[MetrowestZ]

I'm also in Massachusetts and I also had my first 1PD experience in snow/ice on Sunday, driving back from NH on I-93. I started the drive in unbridled with 1PD enabled, and the deceleration was way too strong for the light snow that was coming down, especially with the stock (AWD Premium ER) tires. After a couple of scary skids I changed the drive mode and turned off 1PD, and I also made a mental note that these tires really suck in snow.

Edit: I'll also echo what someone said above, which is that the brakes on the MME are pretty harsh. Why are they so difficult to modulate?

Exact same first experience this last Sunday except mine was on 128. Was frantically searching for the hazard button.

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