[Bristle Hound]

Originally Posted by zilla91

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

I have a Uk diesel MY20 X3 & can confirm no MH tech on it
Hate stop/start with a passion & coded it out the day I collected it

[MasAyinde]

Originally Posted by ridetime

Not sure what you find so funny about the points I've laid out. In the UK the M40i got the mild hybrid tech in 2021 before the LCI. Unchanged power and 0-60 numbers over the previous few years. I take it you've completely disassembled an M40i?

[ridetime]

Originally Posted by MasAyinde

Not sure what you find so funny about the points I've laid out. In the UK the M40i got the mild hybrid tech in 2021 before the LCI. Unchanged power and 0-60 numbers over the previous few years. I take it you've completely disassembled an M40i?

I think its the part about BMW adding hybrid to 20/21 drivetrain but didn't tell anyone. Its says you live in PA. I live in the US. I don't care about non US vehicles.

[MasAyinde]

Originally Posted by ridetime

I think its the part about BMW adding hybrid to 20/21 drivetrain but didn't tell anyone.

You're right, that's a completely unreasonable conclusion when my manual states that the battery needs to be charged if I notice weak acceleration. Maybe during acceleration, the battery whispers words of encouragement to the engine instead.

[ridetime]

Originally Posted by MasAyinde

You're right, that's a completely unreasonable conclusion when my manual states that the battery needs to be charged if I notice weak acceleration. Maybe during acceleration, the battery whispers words of encouragement to the engine instead.

I haven't seen that in the manual. Maybe you can provide a link or section/page number so we can all start charging our battery for better acceleration.

[MasAyinde]

Originally Posted by ridetime

I haven't seen that in the manual. Maybe you can provide a link or section/page number so we can all start charging our battery for better acceleration.

This is in the battery section, so forgive me if by reading that mild hybrid is supposed to help with acceleration has me connecting dots. Does nobody else with a 2020 have this?

[ridetime]

Originally Posted by MasAyinde

This is in the battery section, so forgive me if by reading that mild hybrid is supposed to help with acceleration has me connecting dots. Does nobody else with a 2020 have this?

I see it on page 337 of the 21 manual. Your right it does say to charge it.
I say IF your battery is not defective, older than 4-5 years or has recently been fully discharged for some reason, the vehicles electrical system will maintain a charged state. In other words charging your normally functioning battery will do absolutely nothing for acceleration.

To be clear, you seemed to imply that BMW secretly added electrical assist to the US 20 and 21 model years and that is simply not the case. There are no electric powertrain assist components in any US X3/4 M40i prior to the 22MY.

[MasAyinde]

Originally Posted by ridetime

I see it on page 337 of the 21 manual. Your right it does say to charge it.
I say IF your battery is not defective, older than 4-5 years or has recently been fully discharged for some reason, the vehicles electrical system will maintain a charged state. In other words charging your normally functioning battery will do absolutely nothing for acceleration.

To be clear, you seemed to imply the BMW secretly added electrical assist to the US 20 and 21 model years and that is simply not the case.

Genuinely curious, how is it that a weak battery hinders acceleration but a charged battery doesn't help acceleration? Would engaging a clutch driven alternator affect acceleration noticeably? I'd also expect to see a performance difference in 2022s

[ridetime]

Originally Posted by MasAyinde

Genuinely curious, how is it that a weak battery hinders acceleration but a charged battery doesn't help acceleration? Would engaging a clutch driven alternator affect acceleration noticeably? I'd also expect to see a performance difference in 2022s

The 12v battery weak or strong (but not defective) doesn't change acceleration just like a charged battery doesn't.
Putting a brand new 1000CCA battery in your vehicle won't make it faster. Just like having a 3 year old 400CCA (weak) battery won't make it slower. If you disagree then by all means hook up to a charger whenever your feeling it.

[HighlandPete]

Originally Posted by ridetime

The 12v battery weak or strong (but not defective) doesn't change acceleration just like a charged battery doesn't.
Putting a brand new 1000CCA battery in your vehicle won't make it faster. Just like having a 3 year old 400CCA (weak) battery won't make it slower. If you disagree then by all means hook up to a charger whenever your feeling it.

A battery with low SoC can mean the energy management moves to the 'conventional' charging phase. Under normal power management, it 'disconnects' alternator charging on acceleration. I've not checked this out, but this may not happen in the 'conventional' (low battery state) charging phase. If that is so, it's sapping several bhp.

[HighlandPete]

Originally Posted by MasAyinde

This is in the battery section, so forgive me if by reading that mild hybrid is supposed to help with acceleration has me connecting dots. Does nobody else with a 2020 have this?

MHT is a recent addition with an extra lithium battery up front. Different technology, easily identified.

[MontyB1]

Originally Posted by MasAyinde

Not sure what you find so funny about the points I've laid out. In the UK the M40i got the mild hybrid tech in 2021 before the LCI. Unchanged power and 0-60 numbers over the previous few years. I take it you've completely disassembled an M40i?

Only diesels got MHT in 21, no petrols on the X3, that only came in one the LCI.

[Bristle Hound]

Originally Posted by ridetime

I live in the US. I don't care about non US vehicles.

Why don't you say it how it is!

[MontyB1]

I think the new MHT in the 21-22 is great, I just don't notice it anymore at all. Genuinely not sure why anyone would want to code it off its that good now compared to stop/start before.

The extra features also seem to help drop consumption as well and often you don't know they are even working unless you glass down and the engine has switched off for example.

Do people intentionally WANT to use extra fuel just for the hell of it, for the pocket and the planet it seems a great move and sensible to use but each to their own I guess.

[BobGriff]

EPA ratings are developed in a lab (EPA or MFR) with a driver following a script. Its not a real world number in that context but reflects an estimate of expected performance.

EPA numbers are published for a gasoline vehicle or a plug-in hybrid or an electric vehicle (this is on your label). The x3M40i is classified as a gasoline vehicle. Im not convinced that method fully captures the mild hybrid regeneration benefit. I generally get 3 to 5 MPG better than the EPA labeled unless I'm pushing it BUT....

It ABSOLUTELY depends on how you actually drive. My jeep and my Bmw are tested in exactly the same way for EPA MPG number, BUT I drive them very differently.

Beyond mpg, I'm very satisfied with the mild hybrid system. Its a more graceful stop/start function and operates well with the assisted driving system in stop-n-go traffic.

[MasAyinde]

Do the 2022s have a different battery or is the MHT powered by the same additional battery that previous years M40is have?

[MontyB1]

Originally Posted by MasAyinde

Do the 2022s have a different battery or is the MHT powered by the same additional battery that previous years M40is have?

I think there was link earlier in the thread its a separate battery that is used. I don't think the X3 M40i had MHT until the 2022, the 40d had it pre-LCI however in some markets.

[freshxdough]

Originally Posted by MasAyinde

Do the 2022s have a different battery or is the MHT powered by the same additional battery that previous years M40is have?

The 48v vehicles have a 48v lithium battery. On non 48V cars the additional 12v battery is just an auxiliary battery and not lithium.

[jhm5]

I have data from my 1200 mile break in period on my '22 X3M40i. See the attached. I spent 1 day, 13 hours, 3 minutes driving 1246.7 miles. During that time, the engine was off 1-hour-35-minutes, so not burning fuel and not emitting pollution. If my math is correct that's about 4% of the driving time the engine was off. Average speed 35.4 mph. Average mpg 24.5. My driving was mostly rural-surburban. Only 1 highway trip of maybe 150 mi. So lots of country roads 30-50 mph and relatively few stop signs and traffic lights. Though probably not a direct correlation, 4% would be a savings of about 1 MPG.

[MontyB1]

The saving is larger though isn't it. When the car is stopped and the engines off its reducing your MPG otherwise your average MPG figure would be even lower for the overall trip.

Stop start is seamless in the MHT cars, I'm really not sure why anyone would want the engine to run and use fuel when its not needed and provides no benefit.

https://www.roadandtrack.com/new-car...-fuel-savings/

[BobBMWX3]

Originally Posted by MontyB1

The saving is larger though isn't it. When the car is stopped and the engines off its reducing your MPG otherwise your average MPG figure would be even lower for the overall trip.

Stop start is seamless in the MHT cars, I'm really not sure why anyone would want the engine to run and use fuel when its not needed and provides no benefit.

Interesting video in that it actually gives you the break even point. Approximately 7 second stop. Less than that, better to idle, more time better for the Stop/Start to kick in. Definitely a benefit for traffic that has you sitting at stop lights. I have some routes that would make sense to not have it running.

While the Start/Stop works very well, there is a definite delay compared to idle when moving from a stopped position. For most drives, not a problem, but when needing a quick start, it can make a difference to be in idle.

[mike40i]

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.

how long before it breaks in? I too just got my 22 x3 m40i