Great regen after brake flush

[f1eng]

No, I did not know that, but since with it "on" it is very hard to tell it IS on, (I often have to check that the icon is lit up) . Porsche thinks it s/b set low, but many of us think we should have an option to increase it. Maybe they can start a subscription to that too? $$$$
And some do not like it. YMMV.

My lawnmower has 1-pedal driving and I have got used to it but don't like it.

The Porsche system is much more sophisticated than Tesla since it uses the brake pedal for regeneration up to the maximum charge rate the battery can take, then blends in the discs if more deceleration is being asked by the brake pedal, which isn't often.

The switch on the dash simulates the behaviour of lifting the throttle on an IC engined car, to make it reassuringly familiar.

One of the reasons I bought the Taycan is because of its very high level of regeneration on the brake pedal developed from the system on the 919 Le Mans car.

The car software is way ahead of the Tesla. The ICE software isn't, of course.

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[bj33813]

Sorry Bob but I think you've mis-understood how regen works in the Taycan.

it's much easier to explain how regen works in Teslas first. Tesla have only 2 regen modes, strong or weak, peaking at 70kw. However Tesla do not have the technology to blend physical brakes (pads and rotors) with regen, so as soon as you touch the brake pedal, the physical pads are activated, therefore losing energy and efficiency. So they designed this "one-pedal driving" which is essentially a marketing trick hiding their limited regen technology.

In Taycans, regen is used in 95% of situations, including when you step on the brake pedal. Taycans can regen at 260kw which nearly 4 times "stronger regen" than the tesla. For most of the time, when you smash the brakes in the Taycan, regen is used to slow the car down, but Porsche has the technology to make this infinitely variable depending on how hard to step of the brakes.

To maximise, efficiency, you should turn off regen completely as the Taycan is able to decouple the drive train from motor therefore can coast for miles using next to no energy. Coasting is the most efficient way of driving EVs, not using regen. Yes it takes some getting used to but once you know how the taycan coasts you will never use the default regen again lol.

OK, I surrender lol! I can see why I am wrong about regen in the Taycan. I was under the wrong impression of its function, and since it apparently serves no real purpose that will best the system design, will leave it off.

Thanks for all the corrections guys!

 

[evn00b]

OK, I surrender lol! I can see why I am wrong about regen in the Taycan. I was under the wrong impression of its function, and since it apparently serves no real purpose that will best the system design, will leave it off.

Thanks for all the corrections guys!

You will be surprised how many so-called professional reviewers got it wrong as well and were cluelessly crowing about the Taycan’s “weak regen” and how Tesla was superior. I have a Tesla rental right now and absolutely hate the golf cart style one pedal driving where it aggressively slows down the car when I lift my foot off the accelerator.

 

[Rickpriceuk]

Surely physics dictates that using regen is inefficient?

using the principle that no system can be 100% efficient, slowing down from a given speed on regen will not generate the energy it took to accelerate to that speed. And the energy so reclaimed cannot be enough to take you back to your cruising speed.

so repeatedly slowing down and speeding up is inherently inefficient. In an ideal world you would accelerate to a fixed speed and then only use the energy required to stay there.

it’s equally true of petrol cars although there is no regen. Nonetheless, speeding up and slowing down is e pensive on fuel - hence cruise control is the most efficient means of travelling at a given speed.

 

[JAGMAN]

OK, I surrender lol! I can see why I am wrong about regen in the Taycan. I was under the wrong impression of its function, and since it apparently serves no real purpose that will best the system design, will leave it off.

Thanks for all the corrections guys!

I wouldn’t beat yourself up too much. The title of the “Regen On/Off” setting adds to the confusion. It is poorly labeled. Perhaps “Coasting On/Off” would’ve been more appropriate.

 

[mystermykee]

You will be surprised how many so-called professional reviewers got it wrong as well and were cluelessly crowing about the Taycan’s “weak regen” and how Tesla was superior. I have a Tesla rental right now and absolutely hate the golf cart style one pedal driving where it aggressively slows down the car when I lift my foot off the accelerator.

I'm in the same boat. I have a Model 3 LR rental right now while the Taycan is at the body shop. I've posted many times on this forum my disgust for Tesla's implementation of regen. I live in CA and Teslas are everywhere. One pedal for acceleration, another pedal for slowing down. PERIOD. Brake lights should only ever come on when the "slowing down" pedal is pressed. With a Tesla, theirs come on when a decel threshold is met. I don't know what it is exactly, but soooo many Tesla drivers brake check people without even knowing it because of the accel pedal let off for a split second. Funny, I just came across this trying to search for the decel threshold.

 

[f1eng]

Surely physics dictates that using regen is inefficient?

using the principle that no system can be 100% efficient, slowing down from a given speed on regen will not generate the energy it took to accelerate to that speed. And the energy so reclaimed cannot be enough to take you back to your cruising speed.

so repeatedly slowing down and speeding up is inherently inefficient. In an ideal world you would accelerate to a fixed speed and then only use the energy required to stay there.

it’s equally true of petrol cars although there is no regen. Nonetheless, speeding up and slowing down is e pensive on fuel - hence cruise control is the most efficient means of travelling at a given speed.

Regen isn't 100% efficient, no, but it is (much) more efficient than friction brakes.
The optimum for efficiency is coasting and adding just as much power as is needed, as you write, but it is more complicated than using cruise control for max efficiency that only is true with no elevation change. Holding a steady speed up hills uses more power and down hills doesn't compensate. It is most efficient to use a fixed throttle opening on a IC engined car but that would be as annoying for other road users as adaptive cruise on moderately busy roads.

Overall better efficiency is more a knowledge and driver understanding thing, but brake pedal regeneration will always be more efficient than conventional friction braking.

 

[Porsche-Guru]

Overall better efficiency is more a knowledge and driver understanding thing ....

 

[bluesky]

I wouldn’t beat yourself up too much. The title of the “Regen On/Off” setting adds to the confusion. It is poorly labeled. Perhaps “Coasting On/Off” would’ve been more appropriate.

It’s worth looking this up in the owner’s manual. The feature in question is “overrun recuperation”, and that’s the only thing that’s driver adjustable, with off (coast, only in certain conditions), on (moderate engine brake effect, but only in certain conditions) and auto (variable, but again only in certain conditions). If you read the section, you’ll see that auto mode has some conditions to work (sensors not dirty). Coasting is available in “off” (but not on major inclines) and it says you have to ease slowly and fully off the accelerator pedal. If you just lift abruptly, it probably won’t coast. Overrun recuperation is not available in PSM SPORT ever. Also apparently the different drive modes may start out with different overrun recuperation mode setting.

Overrun recuperation will be minimal at high SoC, and probably the braking recuperation too, I guess to avoid overcharging the battery.

 

[WuffvonTrips]

Overrun recuperation is not available in PSM SPORT ever.

I can't say I've noticed that the few times I've switched PSM setting- just checking the electronic manual, I see Automatic overrun recuperation is only available when PSM is active. Automatic overrun recuperation is not available in "PSM SPORT" mode.

Also apparently the different drive modes may start out with different overrun recuperation mode setting.

Defaults to ON when switching to Sport or Sport Plus, otherwise defaults to OFF.

 

[ShiftyWolf]

I partly bought an EV for the fun of learning a new driving experience and am enjoying becoming familiar with my Taycan. It might not be the majority preference but I like to use Auto regen as a cheap version of ACC, which my spec did not include.

I am not a fan of one pedal driving, having used it a few times in a borrowed Bolt.

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