So dangerous gearbox gap in acceleration.

[Greeves]

HS PHEV Automatic, no problem with lag. Return yours to the dealership to sort your issue.

 

[DunMoose]

Just to confirm that in the 2024 facelifted model , the lag is still there. It is very annoying and dangerous. In my opinion it also affects the hybrid mode when you really accelerate a lot. The lack of "EV" power has an effect on the hybrid acceleration..

Can confirm the lag is definitely still there. I have a 6 week old 2024 model and have done just over 3000 miles. For me, the most dangerous part of this is at roundabouts where you approach, can see a gap, try to accelerate forward and nothing happens but you are committed. A couple of near misses already and I’m waiting to see myself on some You Tube Dash cammers video of some “muppet who can’t drive”. I just drive in the auto mode as unable to charge at home but it sounds then as if the car has switched to electric mode at this point.

 

[John Smith]

Can confirm the lag is definitely still there. I have a 6 week old 2024 model and have done just over 3000 miles. For me, the most dangerous part of this is at roundabouts where you approach, can see a gap, try to accelerate forward and nothing happens but you are committed. A couple of near misses already and I’m waiting to see myself on some You Tube Dash cammers video of some “muppet who can’t drive”. I just drive in the auto mode as unable to charge at home but it sounds then as if the car has switched to electric mode at this point.

AMT mode will solve this problem in 30 seconds. Unfortunately my earlier post regarding AMT mode was removed from this forum for some reason better known to the Administrators !

 

[midician]

The lag I experience is usually at 80 km/h and very momentary. Never been dangerous . Yours sounds worse than it should be so bring it to your dealer to have it checked out .

 

[Coulomb]

Unfortunately my earlier post regarding AMT mode was removed from this forum for some reason better known to the Administrators !

? I don't think so. There is some glitch with the Facebook page, but I think that's at the Facebook end.

See for example this earlier post.

 

[John Smith]

? I don't think so. There is some glitch with the Facebook page, but I think that's at the Facebook end.

See for example this earlier post.

This says differently. Screenshot from a friends laptop. Certainly looks like it's not publicly visible. And even states it's removed or not visible ?. ?

 

[Coulomb]

This says differently.

Happens to me too. But that message has a Facebook logo and link. If it's visible from Facebook, you may need to change some permissions in the Facebook post to enable it to be seen outside of Facebook.

 

[Greeves]

My EHV purchased new in May 2022 has never had this 'lag' problem. Neither did the demonstrator that I drove prior to my purchase. Why would anyone buy a car if they were dissatisfied with it? As the number of complaints on this forum in comparison to the total number of models on the road is small I suspect the majority of owners do not have an issue!

 

[Kerno]

My EHV purchased new in May 2022 has never had this 'lag' problem. Neither did the demonstrator that I drove prior to my purchase. Why would anyone buy a car if they were dissatisfied with it? As the number of complaints on this forum in comparison to the total number of models on the road is small I suspect the majority of owners do not have an issue!

It depends on how you drive it, if your just taking your time it's virtually flawless. However its when you need power that it shows its ugly head and more so when in EV mode. Go for an overtake with your foot flat to the floor and there is a big gap in the acceleration at 80kph\50mph as the gearbox shifts from low to high. Its even quite profound in Hybrid mode as well. The changes mentioned in other posts (AMT and mode1) help a bit but it still has to change mechanically from low to high. I have no idea why MG use a motor that requires a separate gearbox most EV's are single speed so the acceleration is seamless.

 

[midician]

It depends on how you drive it, if your just taking your time it's virtually flawless. However its when you need power that it shows its ugly head and more so when in EV mode. Go for an overtake with your foot flat to the floor and there is a big gap in the acceleration at 80kph\50mph as the gearbox shifts from low to high. Its even quite profound in Hybrid mode as well. The changes mentioned in other posts (AMT and mode1) help a bit but it still has to change mechanically from low to high. I have no idea why MG use a motor that requires a separate gearbox most EV's are single speed so the acceleration is seamless.

When I first experienced it I instinctively tried to floor the accelerator to overcome it which actually makes it worse. I think this is because the automatic transmission thinks it needs to change down a gear instead of up and adds some more delay . If you just keep the accelerator evenly pressed the lag is shorter. This is very similar to DSG lag in VW vehicles .

 

[Delboy102000]

I suppose the reason they put a gearbox in the electric dive is to deliver more power from a smaller motor. Without gears maybe the torque required would put a greater drain on the battery and so would significantly shorten the EV miles per kWh. This is how they get good range out of a small battery in a heavy car.
To be honest I have never noticed the lag except in pure ev mode, usually between 40-45 MPH. Overall it’s an impressive piece of kit.

 

[DunMoose]

AMT mode will solve this problem in 30 seconds. Unfortunately my earlier post regarding AMT mode was removed from this forum for some reason better known to the Administrators !

So did AMT mode change and 1500 miles later, whilst the gear changes are smoother and it changes gear at about 31mph rather than 33mph, this lag at low speed is still there.

 

[DunMoose]

It’s not as simple as switching off EV mode. Due to various reasons, my car is driven primarily on petrol with regenerated electricity boosting it as and when it chooses. I get the same lag occasionally where it faffs around deciding to switch between EV and petrol mode, which you can’t control, at around 40-50mph but more concerningly at low speeds where you are pulling out at junctions where you press go and car says I’ll think about it. Dealership says it’s because the electric charge is on zero. Sorry but as I drive 50-60 miles a day with work, what am I supposed to do after the electricity runs out after 30 miles? Dealer cop out and a not fit for purpose vehicle. If it happened all the time, then you anticipate it like the old fashioned turbo lag, but this happens erratically giving no confidence in the vehicle.

 

[yeancek]

I have noticed when you keep your feet on the gas the lag takes longer. when you release the gas for just a moment and then gas again it goes faster...anyone else agrees?

Agree

I’ve stated before that I find the lag in the gearbox at the critical speed of circa 50 mph really dangerous.
Because I’ve got used to living with it doesn’t alter the fact that I think it’s really dangerous and I’m surprised that the car was put on the market with the issue in the first place, and hasn’t been recalled for a fix.
Because of it I hesitate before overtaking but when entering motorways as I do often on the M20 from a slip road, I am very concerned about being hit in the rear by one of the hundreds of mainly foreign lorries on the inside lane.
I’m surprised that this isn’t a big issue on our forum where members seem more concerned about their lack of DAB radio.
I’ve had my car 2 years and 16k miles now and perhaps I’ve been lucky that everything else has been pretty faultless.

Have you considered changing the car configurations through the secret menu? I have done that, I feel the lag is less, and there is more power.
Should check it out.

 

[Delboy102000]

This lag is actually the electric motor shifting from low to high or vice versa. If there was no gearbox on the electric drive the top speed in full hybrid would be limited to the max speed the electric motor could run at. So to get good performance without a much bigger motor and battery the electric motor has a normal and overdrive gear on two speeds. Thus you get 10 gears. Six plus four electric.

 

[FMoggio]

This lag is actually the electric motor shifting from low to high or vice versa. If there was no gearbox on the electric drive the top speed in full hybrid would be limited to the max speed the electric motor could run at. So to get good performance without a much bigger motor and battery the electric motor has a normal and overdrive gear on two speeds. Thus you get 10 gears. Six plus four electric.

Correct. The problem is that the shifting is not done in a good way. I think they mimic the usual logic we have with the ICE gears shifting. with an ICE, if you go quietly the RPM doesn't rise too much but if you press the pedal full down the RPM rises much more and, with the ICE this is good, it still has power to provide. They are applying the same logic with the electric motor. In EV, if you proceed quietly, the gear shifts at a reasonable low RPM (7.5 more or less). Instead if you press the pedal full down they apply the same logic as for the ICE and they keep the gear longer with the RPM rising but not having any more power left to provide. If you override the logic stopping the acceleration at 7.8 RPM, the gear shifts and the RPM goes down instead of rising with no power left. In this way you can reduce the lag. They should just modify the shifting logic.

 

[BrianG]

These power lags seem to be present in all hybrids in that the delay in going from battery to petrol assist requires the engine to start. For that reason I think all hybrids should come with a hazard warning. Frankly none of them are ideally suited to UK and quite possibly most EU roads that have unpredictable line of sight. Of course the big question is, why would folks not just buy an EV and be done with all the ICE faff, servicing and fuel costs. Had my ZS for 4.5 years now and after initial software upgrades it has been remarkably trouble free. Hence MG are overtaking all the old ICE brands in sales numbers.

 

[FMoggio]

The lag Is not related to the ICE starting. It happens even when the ICE Is well started. It Is related to the ev gears shifting Logic. If you activate the battery charging options, to have the battery at 50 or 100 % charged by the ICE, the ev shifting Logic totally changes with the ev motor RPM not rising at all . In this case you don't have any lag.