[08-335xi]

Have any of the new owners of the 2022 M40i been able to tell a difference in any real gain with the new 48V mild hybrid system? Logic would make one think that the system would improve the start - stop functionality as well as add torque while there is sufficient charge. Just curious as the new system likely adds mass and I am curious if the benefits offset the inherent additions/complexity. I have seen the fuel economy listings and no HP rating improvement, but we all know BMW tends to be conservative with their published specifications.

[JustinHEMI]

Timely! I was about to start a similar thread! Avoiding electrification is one reason I went 2021. Looking to hear real world thoughts.

[yomaster]

Originally Posted by 08-335xi

Have any of the new owners of the 2022 M40i been able to tell a difference in any real gain with the new 48V mild hybrid system? Logic would make one think that the system would improve the start - stop functionality as well as add torque while there is sufficient charge. Just curious as the new system likely adds mass and I am curious if the benefits offset the inherent additions/complexity. I have seen the fuel economy listings and no HP rating improvement, but we all know BMW tends to be conservative with their published specifications.

In my opinion, the 48V mild hybrid system is just a way how car company try to pass the very strict Europe emissions regulation... I don't think it's really there to help with increasing fuel economy or sth...Yes it can save you some tiny little gas but it just NOT worth it to keep start/stop your engine...which can shorten the life of your motor starter and other potential wear and tear (the main reason why i coded to disable engine start/stop function for my 2020 M40i)...Just my opinion...and it add weights which does not help with fuel economy...

[pr0gi]

I've been thinking about this. On paper I see that the car is now heavier and just a bit slower from 0 to 60. Also, I've seen increase of the co2 emissions plus worse fuel consumption compared to the pre-LCI. So what exactly is the purpose of this technology?

[rodo94]

Originally Posted by yomaster

the 48V mild hybrid system is just a way how car company try to pass the very strict Europe emissions regulation...

Europe's newest loophole.

This is exactly why this system is installed, same in Lambos, Ferrari...
without it the car is taxed 20kE in France, 30kE for the M.

There is no gain, only in weight.

[rodo94]

Originally Posted by pr0gi

So what exactly is the purpose of this technology?

none, avoid taxes in europe

[montanaman]

Interesting..

[Petrolhead3010]

I have a MY'21 with the MHS, & from what I can tell &/or was told it helps with the ASS functionality, recharges the battery, & helps with low end grunt

[silverathlon]

I would say it has little to no benefit and the reason for it is to pass the vehicle emission standards in Europe.

[zilla91]

Originally Posted by Petrolhead3010

I have a MY'21 with the MHS, & from what I can tell &/or was told it helps with the ASS functionality, recharges the battery, & helps with low end grunt

I'm pretty sure the pre-LCI cars don't have the mild hybrid system unless you happen to drive a diesel, which I don't think you get over in America

[HighlandPete]

Originally Posted by Petrolhead3010

I have a MY'21 with the MHS, & from what I can tell &/or was told it helps with the ASS functionality, recharges the battery, & helps with low end grunt

Plus emissions. It all adds up, even if small in real terms.

[jhm5]

I asked this question on the G20 forum. The 2021 M340 and M440 have the mild hybrid B58. One response is that it smooths out the start/stop function so it's pretty seemless and you get an initial extra bump in acceleration eliminating even the slight turbo lag in the B58. No noticeable benefit to fuel economy. X5 also has had the mild hybrid a year or so.

[alpinec1984]

One reason might be that once you have 48V architecture, you can run some things electrically that used to need a belt, or run more things than you could before with 12V. Smaller wires too. That said, how much of the car is 48V?

[prototyp]

48v system in our X5 is pretty great.

Saw a comment above suggesting this will "shorten the life of your motor starter and other potential wear and tear" except that's not at all how this system works. Since we're not doing research, to sum up: the "starter motor" is now a motor/generator replacing what used to be the alternator and eliminating the old traditional starter. It's a belt-drive system designed for this job.

In day to day use it's nearly seamless (gets a little weird occasionally when sneaking into a narrow parking spot) and definitely helps with around-town/stop-go gas mileage. X5's average is something like 25mpg which is even better than my old (much simpler, much lighter, manual-trans) 330i.

It's all quite clever and can't possibly add much weight: one component's been swapped, one quite heavy one has been removed, and the 48v battery isn't very big (Bosch's weighs 6kg). I like knowing my braking is generating juice that is then used for off-the-line power boost amongst other things. So many of our many many many stoplights are quite long, so /not/ idling away at them is a good idea.

Now the ASS in my non-mild-hybrid X3 is just a sad old crank-starter 12v anachronism that is turned off.

[jhm5]

Thanks, prototyp. It's good to see at least one satisfied customer. Where is the electric motor? What is adding the 10HP? It must be in the driveline somewhere.

[montanaman]

So with this new mild hybrid does the engine shut off at a stop or is there still a separate auto stop/start button to defeat the engine stopping?

[newtoncd8]

The 48-volt mild hybrid system provides up to 11 hp of extra push and enables the gas engine to turn off completely when the car slows down to under 9 mph. The system is also able to shut the engine off and "glide" at speeds between 15 and 99 mph.
In theory, this should help with gas mileage; after my '22 X4 M40i, breaks in, I will report back.

[ridetime]

Originally Posted by newtoncd8

The 48-volt mild hybrid system provides up to 11 hp of extra push and enables the gas engine to turn off completely when the car slows down to under 9 mph. The system is also able to shut the engine off and "glide" at speeds between 15 and 99 mph.
In theory, this should help with gas mileage; after my '22 X4 M40i, breaks in, I will report back.

The only problem with the theory is that the window sticker has the official EPA numbers on it and they are actually worse by 1 mpg on the highway and the same in the city and combined when compared to the 21 model.

[HighlandPete]

Originally Posted by ridetime

The only problem with the theory is that the window sticker has the official EPA numbers on it and they are actually worse by 1 mpg on the highway and the same in the city and combined when compared to the 21 model.

Could be the EPA test parameters are not showing up improvements. What are the CO2 figures?

For example the G20 M340i, WLTP combined (European test), CO2 improvement of up to 8g/km with the mild hybrid features.

[Ctriggs5]

I drove to work this morning at 70-75 mph on approximately 24 highway miles and 3 street miles. Here were my results. Interesting

[ridetime]

Originally Posted by HighlandPete

Could be the EPA test parameters are not showing up improvements. What are the CO2 figures?

For example the G20 M340i, WLTP combined (European test), CO2 improvement of up to 8g/km with the mild hybrid features.

In the US the definitive standard is the EPA figure on the window sticker. All manufactures want those numbers to be as high as possible. If there was improvement in the mileage numbers you can bet BMW would make sure the correct numbers were reflected on the sticker. In the case of the 2022 48v X3 M40i they did not improve compared to the 2021 model.

[ridetime]

Originally Posted by Ctriggs5

I drove to work this morning at 70-75 mph on approximately 24 highway miles and 3 street miles. Here were my results. Interesting

What will be more interesting is to see the same display right before you refuel from near empty.