MG4 Xpower times vs battery

[jamherber]

On my SE SR I can see 100% power on the driver display at any SoC except below about 20%. ?‍

Yes I would expect the software to start limiting power further after 20% to save range. The fact that the display is reporting 100% power, this is what the software is set to draw as a maximum from the battery when reporting 100%, rather than what the maximum power the battery could actually provide.

On the X-Power, when reporting 100%, this is the full maximum the battery can provide without an artificial software limit, hence why it will produce different performance at different SoCs between 100 and 20%.

 

[bedsev]

stupid question, but when do you see the 100% power? Is it before the launch or do you have to look at the dash when accelerating?

 

[jamherber]

stupid question, but when do you see the 100% power? Is it before the launch or do you have to look at the dash when accelerating?

When accelerating hard. Launch control pegs it to an initial 66% which I guess is the optimum that MG found to give the best launch with the traction available.

 

[JonnyG]

Acceleration tests from 90% SoC to 10% SoC ?.... on Winter tyres

You can see he waits for the launch control to get to 66% power (bottom right) before launching

 

[bedsev]

so basically over 50% you should pretty much get the full package and under 30% its drops off

 

[topperharley]

20% → 0-100kmh = 62.5 mph → 4.55 sec
not the same car, incredible to say that a 4.5 sec car is slow ?

Anyway the car is way faster than normal traffic, and faster than the stats of the youtuber at -15 °C (here I have +30 °C) .
Also the relative difference between 30 and 20% is lower. Not bad after all.

12% → 5.75 sec
5% → 8.4 sec

 

[Coulomb]

0-100kmh = 62.5 mph

Actually, 100 km/h is closer to 62.15 mph, using 1 mi = 1.609 km. The actual conversion number is 1.609344, so that makes it 62.14 mph.

For this sort of work, you often need more than two digits of precision. 62.5 mph presumes 1.6 km ~ 1 mi.

I do wish that the UK would finish off the conversion to metric units.

 

[salty]

Actually, 100 km/h is closer to 62.15 mph, using 1 mi = 1.609 km. The actual conversion number is 1.609344, so that makes it 62.14 mph.

For this sort of work, you often need more than two digits of precision. 62.5 mph presumes 1.6 km ~ 1 mi.

I do wish that the UK would finish off the conversion to metric units.

Or just stick to 0-60 like it's always been.
I always do when looking at acceleration times. Looks that little bit better too. ???

 

[siteguru]

I do wish that the UK would finish off the conversion to metric units.

Will never happen - would cost too much to replace all road signage and markings for a start.

 

[topperharley]

I will update with more results, all test have been performed in the same spot with the same method. No Launch control, with 83% I heard wheelspin 3 times under 50 km/h so the time could be improved choosing a better piece of tarmac... but anyway, you can see the performance variation under 30%.

 

[powerfulx]

I will update with more results, all test have been performed in the same spot with the same method. No Launch control, with 83% I heard wheelspin 3 times under 50 km/h so the time could be improved choosing a better piece of tarmac... but anyway, you can see the performance variation under 30%.

View attachment 29538

Thats impressive when u think about it. Really shouldnt be punching under 40% anyway. But good to know for safety purposes of pulling into traffic etc. Above 90% an animal appears, the power curve and sprite is noticeable. Cant wait to get off the stock tyres !

 

[Blindin]

Hi all, we're pretty much out of winter now and the roads have dried up. (Perth Australia) So I ran a few more times. It's seems really interesting that now I'm pulling numbers like I would expect. I was hoping to get it down the drag strip where there'll be good traction (and legal) but haven't had the chance yet.
I want to compare a couple of different timing equipment and also 80-100/130kph. I'm not sure what was happening previously but I'll be keeping an eye on it. My latest numbers are all below 4sec with around 55-60% battery.

 

[Matt x power]

I always keep mine between 60 - 90 percent as that's good for the NMC battery too apparently

 

[Blindin]

I always keep mine between 60 - 90 percent as that's good for the NMC battery too apparently

I started off charging every night to 80%, but I drive somewhere between 25km - 400km daily depending on what I've got on. Generally I'd plug it in if I need the range for the next day or at 40-50%.

 

[salty]

I've been letting my X Power, get pretty low before charging. Down to less than 10% the other day was 5% and it did get a bit worrying. I'm gonna try and stick to charging it when it gets down to about 30%. Also because, apparently you don't get the full performance at less then 30%
Although it still feels pretty quick to me, at less than 30%

 

[Bricktop X PWR]

I've been managing batteries for years now, (being off grid) and the worst thing you can do is discharge a battery and leave it discharged.

This will never happen with our cars.

I have never heard of anyone flattening the car battery then leaving it flat.

I happily run mine down to under 10 percent because I know that I will be charging it immediately.

Leaving it fully charged is also a no no.

And I don't mean overnight ready for a trip out the next day, or charged to 100% and used immediately (as I do) I mean, charged to 100% then left like that for days on end.

You've all heard the mantra '20 to 80 percent' and it makes good sense really.
Not one extreme or another. Just so.

I've been letting my X Power, get pretty low before charging. Down to less than 10% the other day was 5% and it did get a bit worrying. I'm gonna try and stick to charging it when it gets down to about 30%. Also because, apparently you don't get the full performance at less then 30%
Although it still feels pretty quick to me, at less than 30%

It is quick Tony, up to about 30mph.

Just don't 'try' anything with a pretender or otherwise.

She will not be able to offer you the beanage that you are accustomed too, and you might be left looking daft.

When my power's waning I just don't get involved.

In these cases, I just appear to look grown up, sensible and aloof in the face of the 'challenge' being offered.

It's really difficult!

 

[Anon70]

It is interesting that you get more oomph with more fuel with an EV which is the opposite of an ICE car which will be lighter (so faster 0-60) with less fuel. 60 litres of petrol around 50kg

 

[Bricktop X PWR]

It's all too technical for me but to do with having a greater amount of power in reserve to call upon so the "Brain" says 'Oh, OK then, here's the power you requested! (Probably)

 

[Blindin]

I've had a few times times when I've had to crawl back home on 0%. I'd rather not do it, but I have limited chargers available to use; on the odd occasion they have been out of action. The charging network isn't what it needs to be yet in my area. Having said that, it's put on charge as soon as I get home. I do go to 100% sometimes too, but that's when it's doing a good run the next day. I believe doing a 100% from 0% is beneficial too so it can balance out properly.
As mentioned, the lower the battery, the less energy it has to keep the performance, so it should almost always get off the mark ok, but then runs out of power at lower and lower speeds.

 

[bedsev]

Got down to 5% tonight after a failed attempt to charge at lidl near me, had to crawl back in horrendous weather. Not an experience I want repeat. Even on eco and crawling, the car still felt pretty responsive compared to a normal ice car.