[h4bvn]

Hello,

Having recently ordered a 2021 M340i with the 48v mild hybrid. I have a couple of questions that I was hoping some of you might be able to help me with.

- Does the 2021 M340i share the 'sprint' function that is on the M440i? I understand the 2020/19 model doesn't have this feature however as the 21 shares the MHT with the M440i it would make sense to have this feature... Can someone confirm?

- Exhaust sound, does anyone have a 21 MHT car that can post a video of the exhaust sound? or a explain how it compares to the earlier M340i?



thanks all,

[Ace555]

Not entirely sure what you mean by "sprint". I'm assuming you mean the extra boost of power provided by the MHT? If so, yes both the M340i and d have the 11hp boost. When this kicks in and in what circumstances I'm not too sure. The ecu manages power as needed.

[h4bvn]

Originally Posted by Ace555

Not entirely sure what you mean by "sprint". I'm assuming you mean the extra boost of power provided by the MHT? If so, yes both the M340i and d have the 11hp boost. When this kicks in and in what circumstances I'm not too sure. The ecu manages power as needed.

Sorry to be clear. The M440i has a sprint function which is activated by holding the down shift gear leaver on the steering wheel. The driving mode then appears as 'sprint' apparently used for over taking etc.

Just wondered if this feature was now present in the m340i

[marksandygill]

I think they've just come up with a new name, if you pull and hold the left paddle in my 320d it automatically drops to the lowest gear possible, at which point you floor it and get the extra 11bhp as well 🙂

[h4bvn]

Originally Posted by marksandygill

I think they've just come up with a new name, if you pull and hold the left paddle in my 320d it automatically drops to the lowest gear possible, at which point you floor it and get the extra 11bhp as well 🙂

Nice, thanks for that!

[M4dski11z]

Originally Posted by marksandygill

I think they've just come up with a new name, if you pull and hold the left paddle in my 320d it automatically drops to the lowest gear possible, at which point you floor it and get the extra 11bhp as well 🙂

Yup, that’s all that happens

[Ace555]

Originally Posted by h4bvn

Sorry to be clear. The M440i has a sprint function which is activated by holding the down shift gear leaver on the steering wheel. The driving mode then appears as 'sprint' apparently used for over taking etc.

Just wondered if this feature was now present in the m340i

I need to try this!

[philmots]

The MHT system is extremely clever and you need at least 1000 miles on the car to properly understand what it does and how it works to get the best from it.

The motor works even on light throttle openings, as well as ‘E boost’ when you’re fully on it…

But how it regenerates etc by automatically ‘braking’ as you’re approaching roundabouts/junctions etc is very clever.

[225]

Originally Posted by h4bvn

Hello,

Having recently ordered a 2021 M340i with the 48v mild hybrid. I have a couple of questions that I was hoping some of you might be able to help me with.

- Does the 2021 M340i share the 'sprint' function that is on the M440i? I understand the 2020/19 model doesn't have this feature however as the 21 shares the MHT with the M440i it would make sense to have this feature... Can someone confirm?

- Exhaust sound, does anyone have a 21 MHT car that can post a video of the exhaust sound? or a explain how it compares to the earlier M340i?



thanks all,

Can't compare noise wise to a non mht model but having unplugged the flap on one side so its always open mine sounds OK. Certainly loud on start up. If you watch comparison videos just remember they will likely be from the USA where they don't have ppf so louder than eu spec ones.

Not as many burbles as my old f31 340i but it seems loud from the outside. The g20 is well insulated so annoyingly it is a bit quiet when driving but family friendly.

[h4bvn]

Originally Posted by 225

Can't compare noise wise to a non mht model but having unplugged the flap on one side so its always open mine sounds OK. Certainly loud on start up. If you watch comparison videos just remember they will likely be from the USA where they don't have ppf so louder than eu spec ones.

Not as many burbles as my old f31 340i but it seems loud from the outside. The g20 is well insulated so annoyingly it is a bit quiet when driving but family friendly.

Thanks for that. Yes all the videos I've found are US so much louder.

I removed the flap on my 540i and it made abit of a difference so I'll probably do the same on the new car if that's the case.

Hopefully it opens up abit with age as they often do.

[DavidXJ]

Originally Posted by h4bvn

Thanks for that. Yes all the videos I've found are US so much louder.

I removed the flap on my 540i and it made abit of a difference so I'll probably do the same on the new car if that's the case.

Hopefully it opens up abit with age as they often do.

The earlier (19/20) non-MHT versions are indeed more expressive, with burbles in Sport and more chance of provoking some pops on the overrun (if that appeals). But as folks here have said, even then you invariably need the window down, as the G20's cabin is so serene! I'd also vouch for the fact that the exhaust does seem to get richer the more miles you've done: this may be a purely subjective impression, but I'm sure mine began to sound more theatrically exuberant when starting up in Sport with a pre-warmed exhaust than it did before having done about 2K.

[225]

Originally Posted by DavidXJ

The earlier (19/20) non-MHT versions are indeed more expressive, with burbles in Sport and more chance of provoking some pops on the overrun (if that appeals). But as folks here have said, even then you invariably need the window down, as the G20's cabin is so serene! I'd also vouch for the fact that the exhaust does seem to get richer the more miles you've done: this may be a purely subjective impression, but I'm sure mine began to sound more theatrically exuberant when starting up in Sport with a pre-warmed exhaust than it did before having done about 2K.

Definitely louder as the miles go by same for the 340i f series as well.

[beerglass007]

I have a m340i with MHT and sounds the same as a friend of mine who got one without MHT. Cars are approx 5 months different and both in the UK and similar miles

I’ve not driven his but as a passenger it felt just like mine during 0-60 and sounded the same

The more you drive the MHT and get used to driving it the more fun it becomes trying to get the MAX about of miles out of the 48V motor on a journey

The eboost I’m not sure it really is that massive a difference

[330Stevie]

Id concur with Beerglass as the owner of the car he refers to.
No noticeable difference at all in sound or performance that I could tell when having a good blast around in both mine and as passenger in his MHT

[ScottC25]

Originally Posted by beerglass007

The more you drive the MHT and get used to driving it the more fun it becomes trying to get the MAX about of miles out of the 48V motor on a journey

How do you even start to do this?

[marksandygill]

Can't imagine the extra 11hp makes much noticeable difference to a car with 374hp!
I have noticed a slight difference between my last non MHT 320d and my current 320d MHT in performance and fuel economy (economy more than performance to be fair!)

[HighlandPete]

Originally Posted by marksandygill

Can't imagine the extra 11hp makes much noticeable difference to a car with 374hp!
I have noticed a slight difference between my last non MHT 320d and my current 320d MHT in performance and fuel economy (economy more than performance to be fair!)

Agree, it's the lower output vehicles where the extra 11HP and instant torque will be more useful and noticed. Will be interesting to see MHT applied to smaller engine models down the range.

It's a fascinating feature in something like the 318d I was driving. The ability to extend the coasting function at a near constant speed, with foot off the throttle. I guess that is as useful as extra boost.

[Dave_3]

Originally Posted by HighlandPete

Agree, it's the lower output vehicles where the extra 11HP and instant torque will be more useful and noticed. Will be interesting to see MHT applied to smaller engine models down the range.

It's a fascinating feature in something like the 318d I was driving. The ability to extend the coasting function at a near constant speed, with foot off the throttle. I guess that is as useful as extra boost.

It is noticeable in daily driving.

If you watch the power and torque meters as you pootle about town, you very rarely use anything close to 300 hp.

More likely just above the 50 hp mark, with gentle, laid-back driving. In those cases the extra hp is a sizeable proportion when it is used. And a nice wee extra. Just makes it feel slightly more sprightly and smooth.

The coasting function in my car, out on the open road, is great. I'm about 10% of overall mileage coasting at the moment - engine off.

This was from a wee drive out this weekend, mostly torque surfing with no mind of economy. An hour and averaging about 30 mph.

I occasionally monitor the energy flow display .... only seen the full battery set once. I await the pics from those who have managed the opposite.

D.

[beerglass007]

Originally Posted by Dave_3

It is noticeable in daily driving.

If you watch the power and torque meters as you pootle about town, you very rarely use anything close to 300 hp.

More likely just above the 50 hp mark, with gentle, laid-back driving. In those cases the extra hp is a sizeable proportion when it is used. And a nice wee extra. Just makes it feel slightly more sprightly and smooth.

The coasting function in my car, out on the open road, is great. I'm about 10% of overall mileage coasting at the moment - engine off.

This was from a wee drive out this weekend, mostly torque surfing with no mind of economy. An hour and averaging about 30 mph.

I occasionally monitor the energy flow display .... only seen the full battery set once. I await the pics from those who have managed the opposite.

D.

What’s that picture of ? Not seen that on my 340i

[beerglass007]

Originally Posted by ScottC25

How do you even start to do this?

Not sure what you mean ?

The MHT takes a few miles/weeks to get to grips with. Then you can start hypermileing the car.

[Dave_3]

Originally Posted by beerglass007

What’s that picture of ? Not seen that on my 340i

It is the Energy Flow display within idrive. I've bound it to one of my number keys.

It shows if your engine is running, and if using the throttle an orange arrow pointing out of the front of the car showing engine power, joined by a blue arrow if electric assistance. It also shows regen of the battery (drive train highlighted in blue), the charge level of the battery, and coasting.

Normally my battery is at 3 to 4 bars.

You get electrical assistance in many different scenarios. Taking off normally from rest, gentle acceleration, gentle acceleration on motorway etc. Probably most people would never realise. Not just maximum throttle.

D.

[marksandygill]

I've noticed in eco pro mode there's no longer any lag if you put your foot down, presumably the battery kicks in while the gearbox is sorting itself out!