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Technical Topics B58 6-Cylinder Turbo Engine / Drivetrain / Exhaust Modifications MY 21 48V M340i tuning

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      10-19-2020, 01:32 PM   #45
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Quote:
Originally Posted by Ilovemycar View Post
So I just got a 2021 M340i delivered. Today while I was driving, I experience one of the ways the 48v mild hybrid works. I was in 4th gear with low RPMs and as I pressed the accelerator, EBoost kicked in and helped the car accelerate faster. It was completely smooth. Also, when I shut down the car for short period of time, like when you go into cvs or supermarket, when I start the car, it's almost like the car reacts when it shuts down in auto start/stop. Very smooth.
How has your experience been in Sport mode in terms of exhaust burbles/pops? Some are saying that the 2021's sound much different than the 2020's, which is unfortunate and the selling point for many of us on here, myself included.
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      10-19-2020, 01:45 PM   #46
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drove the 2021 m340i..its disappointing imo
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      10-19-2020, 02:49 PM   #47
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Quote:
Originally Posted by eforty6_m3 View Post
Quote:
Originally Posted by Ilovemycar View Post
So I just got a 2021 M340i delivered. Today while I was driving, I experience one of the ways the 48v mild hybrid works. I was in 4th gear with low RPMs and as I pressed the accelerator, EBoost kicked in and helped the car accelerate faster. It was completely smooth. Also, when I shut down the car for short period of time, like when you go into cvs or supermarket, when I start the car, it's almost like the car reacts when it shuts down in auto start/stop. Very smooth.
How has your experience been in Sport mode in terms of exhaust burbles/pops? Some are saying that the 2021's sound much different than the 2020's, which is unfortunate and the selling point for many of us on here, myself included.
I think this whole burbles and pops thing is very subjective. So here is my take: lots of burbles and lots of pops. I drove in sport plus 95% of the time and it's always burbling/popping. However I didn't drive a 2020 or earlier to compare. I am very happy with the way it sounds.
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      10-20-2020, 05:35 AM   #48
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I think the main reason of the 48V mild hybrid is just to reduce C02 in countries where that maters (around 10g/km less than without) that's why it's fairly low key announcement or not at all...
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      10-20-2020, 08:14 AM   #49
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Quote:
Originally Posted by Ilovemycar View Post
I think this whole burbles and pops thing is very subjective. So here is my take: lots of burbles and lots of pops. I drove in sport plus 95% of the time and it's always burbling/popping. However I didn't drive a 2020 or earlier to compare. I am very happy with the way it sounds.
Yep, I totally agree on the subjective part. But again, reading what you're saying is leaving me optimistic. We shall see in a few days.
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      10-20-2020, 05:41 PM   #50
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Happy to report that my 2021 m340i 48v is popping and burbling as much, if not more, than my 2018 340i did.

Note that I usually drive in Sport +.
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      10-20-2020, 08:06 PM   #51
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Quote:
Originally Posted by 340iTCP94 View Post
Happy to report that my 2021 m340i 48v is popping and burbling as much, if not more, than my 2018 340i did.

Note that I usually drive in Sport +.
thats awesome to hear - if possible can you post a sound clip?
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      10-21-2020, 07:24 AM   #52
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Originally Posted by 340iTCP94 View Post
Happy to report that my 2021 m340i 48v is popping and burbling as much, if not more, than my 2018 340i did.

Note that I usually drive in Sport +.
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      10-21-2020, 07:32 AM   #53
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Will farrell is the best.
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      10-21-2020, 07:30 PM   #54
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I drove a 21 yesterday and had it in sports plus . Virtually no pops and burbles and I drove a 20 and it was intoxicating. Honestly it kind of turned me off to it somewhat but its still a great car that handles well and was comfortable. I just sold my 7 series and starting to get serious about my next BMW. The M5 is on my radar and the G80 also but the controversy with the grill and design is making me have second thoughts.
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      10-21-2020, 09:28 PM   #55
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Quote:
Originally Posted by Wyndi335I View Post
I drove a 21 yesterday and had it in sports plus . Virtually no pops and burbles and I drove a 20 and it was intoxicating. Honestly it kind of turned me off to it somewhat but its still a great car that handles well and was comfortable. I just sold my 7 series and starting to get serious about my next BMW. The M5 is on my radar and the G80 also but the controversy with the grill and design is making me have second thoughts.
Get a new or slightly used 20 M340i and then don't feel guilty about modding whatever you'd like

Or can save the additional $ and spend on a real sports car
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      10-22-2020, 07:40 AM   #56
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Quote:
Originally Posted by Gdiddy23 View Post
Quote:
Originally Posted by Wyndi335I View Post
I drove a 21 yesterday and had it in sports plus . Virtually no pops and burbles and I drove a 20 and it was intoxicating. Honestly it kind of turned me off to it somewhat but its still a great car that handles well and was comfortable. I just sold my 7 series and starting to get serious about my next BMW. The M5 is on my radar and the G80 also but the controversy with the grill and design is making me have second thoughts.
Get a new or slightly used 20 M340i and then don't feel guilty about modding whatever you'd like

Or can save the additional $ and spend on a real sports car
Lol... you are correct and I don't have to do anything to it. It's already standing tall and clean as hell. I am actually looking at the M5 and considering CPO or wait until next year and snag one at a deep discount thats been on the lot for a minute. They have a lot of trunk money around May.
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      10-27-2020, 10:21 PM   #57
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Originally Posted by Burrcold View Post
I just saw it on the BMW official site. It's no faster and produces no more hp, is it just to smooth out the auto start/stop?
It is faster, the M440i actively uses it to fill in lag and there is a visible e-boost sign that lights up when you launch control.

M440i did 3.8s 0-60 on carwow and driving reviews have commented on how much they notice the 48V supercharger.
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      10-27-2020, 11:34 PM   #58
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It is faster, the M440i actively uses it to fill in lag and there is a visible e-boost sign that lights up when you launch control.

M440i did 3.8s 0-60 on carwow and driving reviews have commented on how much they notice the 48V supercharger.
Supercharger? Lol lots of people have been getting 3.8s in the M340i as well. I very much doubt that the 48v mild hybrid does anything more than smooth out the start/stop. An 11 hp "boost" would not change 0 to 60 times or make a noticeable difference other than the seat of the pants placebos effect (in my opinion of course).
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      11-01-2020, 12:35 PM   #59
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I just picked up my21 and it's for start/stop and yes u can barely feel it but can't turn off. Only in sport.
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      11-01-2020, 12:41 PM   #60
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No pops no burbles. Once in a blue.....And it's bs if u ask me
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      11-02-2020, 07:09 PM   #61
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Maybe a select few '21s have it until they made the software switch in ~late Aug/Sept? Not sure...
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      11-09-2020, 06:15 PM   #62
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Engine peak power HP and Torque remain the same. The mild hybrid gives a boost at low speeds, like starting off, and provides smoother restarts with start-stop tech. The 2021 M340 is rated 31 MPG highway, up 1 MPG from 2020. City and overall the same. So it seems a small MPG gain and therefore very slightly less greenhouse gas emissions. Not sure about burbles and pops, but if M440 does it with the same engine, M340 should, too.
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      11-29-2020, 12:22 PM   #63
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Quote:
Originally Posted by 340iTCP94 View Post
Happy to report that my 2021 m340i 48v is popping and burbling as much, if not more, than my 2018 340i did.

Note that I usually drive in Sport +.
probably so as much or more than a 2018 F30 but probably not as much as a 2020 G20
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      11-29-2020, 09:35 PM   #64
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I just picked up my 2021 m340 and it's confirmed it's a mild hybrid.

The start up and the exhaust is not as comparable to the 2020 but I actually don't mind it that much. Their are slight burbles on the 2021 at 3000 rpm.

If you guys like to hear it I can record some videos at my shop. I'm sure when the tune comes out it's going to solve that issue.
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      12-01-2020, 02:22 PM   #65
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Quote:
Originally Posted by ALotOfKirbys View Post
I just picked up my 2021 m340 and it's confirmed it's a mild hybrid.

The start up and the exhaust is not as comparable to the 2020 but I actually don't mind it that much. Their are slight burbles on the 2021 at 3000 rpm.

If you guys like to hear it I can record some videos at my shop. I'm sure when the tune comes out it's going to solve that issue.
That would be nice.
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      12-01-2020, 02:24 PM   #66
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Quote:
Originally Posted by alizandru View Post
Quote:
Originally Posted by ALotOfKirbys View Post
I just picked up my 2021 m340 and it's confirmed it's a mild hybrid.

The start up and the exhaust is not as comparable to the 2020 but I actually don't mind it that much. Their are slight burbles on the 2021 at 3000 rpm.

If you guys like to hear it I can record some videos at my shop. I'm sure when the tune comes out it's going to solve that issue.
That would be nice.
Quote:
Originally Posted by alizandru View Post
Quote:
Originally Posted by ALotOfKirbys View Post
I just picked up my 2021 m340 and it's confirmed it's a mild hybrid.

The start up and the exhaust is not as comparable to the 2020 but I actually don't mind it that much. Their are slight burbles on the 2021 at 3000 rpm.

If you guys like to hear it I can record some videos at my shop. I'm sure when the tune comes out it's going to solve that issue.
That would be nice.
Ok I might be able today after I leave my shop
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