2021 M340i vs 2020 M340i Exhaust Comparison Shows 2021 Sounds Different

mdavis3 · 11-11-2020, 03:29 PM

I honestly wouldn't have added the MPE option to my 21 540i if it wasn't going to have the pops. I'm very disappointed that I wasn't told this when I ordered. I specifically said that was what I wanted to hear.

Waste of money. Now I need to figure out how to get the sound back.

NoSugar · 11-11-2020, 03:43 PM

Early adopters and first model year BMW owners always get screwed somehow.

ThugzZ BunnY · 11-11-2020, 03:51 PM

well they probably realized there would be a ton of claims coming for the cats going bad do to the overrun or also worse mpg.

TTG · 11-11-2020, 03:59 PM

Quote:

Originally Posted by BMWdriverf80

Early adopters and first model year BMW owners always get screwed somehow.

Huh? I would consider 2020MY a plus in this case.

chenry · 11-11-2020, 04:12 PM

Quote:

Originally Posted by TTG

Huh? I would consider 2020MY a plus in this case.

+1

W288SH · 11-11-2020, 04:24 PM

I distinctly remember the exhaust note on my 2020 M340i changing over the first 5000 miles and settling into a pleasant but not loud enough six cylinder noise with a bit too much artificial after fire.

My F80 with an M Performance exhaust made the right amount of after fire and was dynamic enough that it didn't sound artificial.

F85Matt · 11-11-2020, 05:16 PM

Quote:

Originally Posted by Blubaron79

Quote:

Originally Posted by F85Matt

Op did you on the 21 go to engine sounds through settings? My coworker has a 21 x3 m40 and engine profile was in comfort for all drive modes. 21 m550 has it too, and is still just as loud and poppy, as well as his x3 m40.....doing some digging in now

Settings for engine sounds are in iDrive now?

Pending the car yes

F85Matt · 11-11-2020, 05:19 PM

Quote:

Originally Posted by Jostack

Quote:

Originally Posted by F85Matt

Quote:

Originally Posted by Jostack

Quote:

Originally Posted by F85Matt

Quote:

Originally Posted by clee1982

so any comparison between acceleration on 48V vs. the old system?

Not acceleration but the start stop system feels way better, shuts off at speed so you don't feel the on off happen. Super smooth in wife's m440

What do you mean "shuts off at speed"?

Auto start/stop is literally for starting the engine from a stop.

Just a little confused.

Correct but because it's now a 48v hybrid system, the car will shut off say at 10mph on deceleration vs when stopped, using the hybrid system instead of gas/motor to finish coasting to a stop. If you get back on throttle quickly vs stopping it's not "electric" but for a few seconds it's transitioning back on vs the instant on/off.

I think that may need more explanation. Transitioning for a few seconds sounds horrible.

If I'm slowing to a stop, but then need to accelerate before the stop is complete, it better GO! If there is a "transition" that is anything less than WOT on tap, I wouldn't be happy.

If it's an ECO-MODE thing, that's fine. I use that on specific highway scenarios only.

Quote:

Originally Posted by Jostack

Quote:

Originally Posted by F85Matt

Quote:

Originally Posted by Jostack

Quote:

Originally Posted by F85Matt

Quote:

Originally Posted by clee1982

so any comparison between acceleration on 48V vs. the old system?

Not acceleration but the start stop system feels way better, shuts off at speed so you don't feel the on off happen. Super smooth in wife's m440

What do you mean "shuts off at speed"?

Auto start/stop is literally for starting the engine from a stop.

Just a little confused.

Correct but because it's now a 48v hybrid system, the car will shut off say at 10mph on deceleration vs when stopped, using the hybrid system instead of gas/motor to finish coasting to a stop. If you get back on throttle quickly vs stopping it's not "electric" but for a few seconds it's transitioning back on vs the instant on/off.

I think that may need more explanation. Transitioning for a few seconds sounds horrible.

If I'm slowing to a stop, but then need to accelerate before the stop is complete, it better GO! If there is a "transition" that is anything less than WOT on tap, I wouldn't be happy.

If it's an ECO-MODE thing, that's fine. I use that on specific highway scenarios only.

My bad man I'm an engineer major lol not English. The car will have Instant go when you mash it, one of the reasons for the mild hybrid system. Electric torque while the engine restarts, vs the old system being like your starter just engaging, and that's it. It's almost like driving the i8 in it's electric and gas setting, when you floor it in electric mode and the engine kicks in. Does that make sense?? If not call me and we can do a zoom convo with demonstration haha

It also doesn't shut off every time like in traffic etc, there's parameters to the system and when it does turn off, it's probably not a time you're about to punch it, but if you did you'd still have the instant go. My X3m and f80 are both set to off lol so personally the feature is stupid.

Blubaron79 · 11-11-2020, 05:27 PM

Quote:

Originally Posted by F85Matt

Quote:

Originally Posted by Blubaron79

Quote:

Originally Posted by F85Matt

Op did you on the 21 go to engine sounds through settings? My coworker has a 21 x3 m40 and engine profile was in comfort for all drive modes. 21 m550 has it too, and is still just as loud and poppy, as well as his x3 m40.....doing some digging in now

Settings for engine sounds are in iDrive now?

Pending the car yes

What would determine?

SoCali E36 · 11-11-2020, 05:31 PM

I've noticed this as well since I work with these cars. I even messaged our product rep asking this question almost 2 weeks ago. He didn't reply lol. I have a feeling that this is tied to the new 48V mild hybrid system.

F85Matt · 11-11-2020, 05:56 PM

Quote:

Originally Posted by Blubaron79

Quote:

Originally Posted by F85Matt

Quote:

Originally Posted by Blubaron79

Quote:

Originally Posted by F85Matt

Op did you on the 21 go to engine sounds through settings? My coworker has a 21 x3 m40 and engine profile was in comfort for all drive modes. 21 m550 has it too, and is still just as loud and poppy, as well as his x3 m40.....doing some digging in now

Settings for engine sounds are in iDrive now?

Pending the car yes

What would determine?

Haha I'm working on that now, so far I can for sure say 21 x3 m40, 21 x5/6/7 m50 and 21 m550/m850. Will check the rest when I get to work tomorrow

rideontwo · 11-11-2020, 08:16 PM

Thanks for the comparison.

Besides the obvious exhaust note, anyone else notice there are less cooling fins on rear diff for the 2021 as compared to the 2020?

dba1t · 11-11-2020, 08:16 PM

Yes, it is OPF. Same situation on the M5 Competition. No more pops and bangs on overrun.

Quote:

Originally Posted by Roger83

Is the US 2021 M340i also getting a particle filter perhaps? It kinda sounds like my 2020 Sept build G21. No mild hybrid yet, but with two particle filters (OPF) making the exhaust sound like a wet fart.

It’s a real shame this is happening. These models need to have great sound. The other models can be limited, but not these!

Gdiddy23 · 11-11-2020, 08:36 PM

Quote:

Originally Posted by dba1t

Yes, it is OPF. Same situation on the M5 Competition. No more pops and bangs on overrun.

Quote:

Originally Posted by Roger83

Is the US 2021 M340i also getting a particle filter perhaps? It kinda sounds like my 2020 Sept build G21. No mild hybrid yet, but with two particle filters (OPF) making the exhaust sound like a wet fart.

It’s a real shame this is happening. These models need to have great sound. The other models can be limited, but not these!

Are you 100% sure about that? I don't think that's accurate and think it's actually the tune and hybrid system

clee1982 · 11-11-2020, 08:43 PM

Quote:

Originally Posted by F85Matt

My bad man I'm an engineer major lol not English. The car will have Instant go when you mash it, one of the reasons for the mild hybrid system. Electric torque while the engine restarts, vs the old system being like your starter just engaging, and that's it. It's almost like driving the i8 in it's electric and gas setting, when you floor it in electric mode and the engine kicks in. Does that make sense?? If not call me and we can do a zoom convo with demonstration haha

It also doesn't shut off every time like in traffic etc, there's parameters to the system and when it does turn off, it's probably not a time you're about to punch it, but if you did you'd still have the instant go. My X3m and f80 are both set to off lol so personally the feature is stupid.

so would you say the stop and go is as good as hybrid (say 330e) if that's the case I would be just fine without the ability to disable it

G35POPPEDMYCHERRY · 11-11-2020, 09:02 PM

Damn BMW nerfing whatever remnants of exhaust they have left. At least it doesn't sound as bad as a stock f80

galeface · 11-11-2020, 09:39 PM

Quote:

Originally Posted by F85Matt

See attached, his car sounded like crap in sport/plus etc.....his engine sound was in reduced -___-

OP needs to try this.

g20_maz · 11-11-2020, 10:54 PM

i have a 2021 m340i and i so far have about 1100 miles on it. at first it didnt pop at all. right now, it pops every once in a while but nothing compared to the 2020 model. kind of underwhelming honestly. cannot wait for bm3 to come out with a tune for it!

TruthOne · 11-11-2020, 11:35 PM

Other than not much or any pops how's the overall sound? Is it a nice deep aggressive sound? That's what I care about . Pops and burbles are ok but I can see that getting old after a while but a nice deep aggressive note always sounds good

Skyhigh · 11-12-2020, 02:22 AM

Quote:

Originally Posted by TheBingoBalls

The 2021's sound is more in line with the F3X 340 and 440. A bit disappointing to say the least especially when the 2020 had a much louder system. BMW teased and then took it away.

Not at all.
2020 is more in line with the F3x 40i.
The 2021 is in line with an Audi S

6ixSpd · 11-12-2020, 02:34 AM

Popcorn exhausts are so overrated. Glad to see BMW clean this up.

SDRX · 11-12-2020, 02:54 AM

You really know how much power is granted to politicians, some of them unelected, when they start controlling the flaps on our exhausts

It's outrageous that as combustion engines make a final salute, we are strangulating the thrill of motoring like this.

11-11-2020, 03:29 PM	#89
mdavis3 Private 13 Rep 50 Posts Drives: 540i MSport Join Date: Apr 2017 Location: Atlanta, GA iTrader: (0)	I honestly wouldn't have added the MPE option to my 21 540i if it wasn't going to have the pops. I'm very disappointed that I wasn't told this when I ordered. I specifically said that was what I wanted to hear. Waste of money. Now I need to figure out how to get the sound back.
	Appreciate 1 JustChris17483.00 Quote

11-11-2020, 03:43 PM	#90
NoSugar Private First Class 135 Rep 118 Posts Drives: G20 330i M Sport Join Date: Jul 2020 Location: East Coast iTrader: (0)	Early adopters and first model year BMW owners always get screwed somehow.
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11-11-2020, 03:51 PM	#91
ThugzZ BunnY Major 682 Rep 1,155 Posts Drives: 2011 335i Join Date: Jan 2015 Location: BMW of Chattanooga iTrader: (0)	well they probably realized there would be a ton of claims coming for the cats going bad do to the overrun or also worse mpg. __________________ IG: @andy__wise Inquiries: Andrew.Wise@bmwofchattanooga.com
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11-11-2020, 04:24 PM	#94
W288SH Second Lieutenant 159 Rep 237 Posts Drives: Current: 2016 X5; 2020 M340i / Join Date: Feb 2020 Location: North Carolina iTrader: (0)	I distinctly remember the exhaust note on my 2020 M340i changing over the first 5000 miles and settling into a pleasant but not loud enough six cylinder noise with a bit too much artificial after fire. My F80 with an M Performance exhaust made the right amount of after fire and was dynamic enough that it didn't sound artificial. __________________ 2016 M3 6MT YMB - Sold 2016 911 - Sold 2016 X5 xDrive 35i - Sold 2020 M340i - Sold 2021 M3 6MT 2023 X5 xDrive 40i
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11-11-2020, 05:31 PM	#98
SoCali E36 BMW Client Advisor 999 Rep 3,526 Posts Drives: X5 40e/e36 M3 Sedan Join Date: Jan 2008 Location: Where the road takes me... iTrader: (10)	I've noticed this as well since I work with these cars. I even messaged our product rep asking this question almost 2 weeks ago. He didn't reply lol. I have a feeling that this is tied to the new 48V mild hybrid system. __________________
	Appreciate 0 Quote

11-11-2020, 08:16 PM	#100
rideontwo Lieutenant 190 Rep 428 Posts Drives: VaNOs Join Date: Jul 2008 Location: NE iTrader: (1)	Thanks for the comparison. Besides the obvious exhaust note, anyone else notice there are less cooling fins on rear diff for the 2021 as compared to the 2020?
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11-11-2020, 09:02 PM	#104
G35POPPEDMYCHERRY Banned 4995 Rep 4,139 Posts Drives: F80 Join Date: Dec 2015 Location: Philadelphia iTrader: (1)	Damn BMW nerfing whatever remnants of exhaust they have left. At least it doesn't sound as bad as a stock f80
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11-11-2020, 10:54 PM	#106
g20_maz Registered 0 Rep 3 Posts Drives: 2021 BMW M340i Join Date: Nov 2020 Location: Irvine, CA iTrader: (0)	i have a 2021 m340i and i so far have about 1100 miles on it. at first it didnt pop at all. right now, it pops every once in a while but nothing compared to the 2020 model. kind of underwhelming honestly. cannot wait for bm3 to come out with a tune for it!
	Appreciate 0 Quote

11-11-2020, 11:35 PM	#107
TruthOne Major 1081 Rep 1,086 Posts Drives: 2021 M340i Join Date: Oct 2020 Location: Oakland, CA iTrader: (0)	Other than not much or any pops how's the overall sound? Is it a nice deep aggressive sound? That's what I care about . Pops and burbles are ok but I can see that getting old after a while but a nice deep aggressive note always sounds good
	Appreciate 0 Quote

11-12-2020, 02:34 AM	#109
6ixSpd Save the manuals! 6012 Rep 6,740 Posts Drives: '16 M3, '23 718 Spyder Join Date: Feb 2016 Location: 416 iTrader: (4)	Popcorn exhausts are so overrated. Glad to see BMW clean this up. __________________ '16 M3 \| '23 718 Spyder Past: E92 M3, F87 M2, E39 M5, etc
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11-12-2020, 02:54 AM	#110
SDRX Captain 204 Rep 741 Posts Drives: 540i M Sport 2018 Join Date: Dec 2007 Location: West Midlands UK iTrader: (0)	You really know how much power is granted to politicians, some of them unelected, when they start controlling the flaps on our exhausts It's outrageous that as combustion engines make a final salute, we are strangulating the thrill of motoring like this. __________________ 2018 G30 540i M Sport X Drive 2020 G05 X5 30d M Sport
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