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M2 Technical Topics > N55 Engine / Drivetrain / Exhaust / Bolt-ons / Tuning > M2 LCI - pops and bangs

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      11-03-2017, 11:26 AM   #45
Daleb
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My LCI car has some nice pops and burbles in traction mode around 2000-2500rpm. sport and sport+ has less but has that 'brrrt' type noise when you accelerate reasonably hard and lift off around the 4000+ rpm area with some pops and burbles but not as much as traction mode low down. My nbt version is L17252I.

Out of interest how does the oem exhaust sound with downpipe on hard wot DCT gear changes? My previous m135i with 8at and downpipe gave off gunshot bangs in the above scenario.
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      11-03-2017, 01:58 PM   #46
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Mine sounds super loud stock with MPE exhaust hehe
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      11-08-2017, 04:40 PM   #47
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Quote:
Originally Posted by Alby_416 View Post
same here I can confirm that (week 36 LCI build)

I'll have the MPE installed shortly and I'll report back
further to my previous message.... tried the 4000/4500rpm lift off and got the first loud bang

super happy with the stock exhaust so far!

can't wait for the MPE
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      11-08-2017, 06:21 PM   #48
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Quote:
Originally Posted by Alby_416 View Post
Quote:
Originally Posted by Alby_416 View Post
same here I can confirm that (week 36 LCI build)

I'll have the MPE installed shortly and I'll report back
further to my previous message.... tried the 4000/4500rpm lift off and got the first loud bang

super happy with the stock exhaust so far!

can't wait for the MPE
Tried the wot till 4.5, 4.7, 5k and lift with no bang yet. I'll keep trying lol
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      11-09-2017, 04:10 AM   #49
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This might be a stupid question, i have an early 17' one of the last PRE LCI's

the weather app in my car has stopped working so they are suggesting a reset or an update but only to the idrive not to the engine so i was told it won't affect the sound of the exhaust only the sound of the interior speakers and idrive.

my car is loud af with M performance exhaust i get all sorts of pops and bangs and crackles, if i did the update and lost all this i think i would lose my mind!

can anyone clarify if the Idrive update affects the engine and exhaust? because i was told you have to do a seperate engine update for this to affect the noise of the car.
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      11-09-2017, 04:59 AM   #50
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Quote:
Originally Posted by Perp View Post
Quote:
Originally Posted by Alby_416 View Post
Quote:
Originally Posted by Alby_416 View Post
same here I can confirm that (week 36 LCI build)

I'll have the MPE installed shortly and I'll report back
further to my previous message.... tried the 4000/4500rpm lift off and got the first loud bang

super happy with the stock exhaust so far!

can't wait for the MPE
Tried the wot till 4.5, 4.7, 5k and lift with no bang yet. I'll keep trying lol
You gotta go wot at 4K then release just under 5k
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      11-09-2017, 01:44 PM   #51
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Quote:
Originally Posted by Perp View Post
Tried the wot till 4.5, 4.7, 5k and lift with no bang yet. I'll keep trying lol
yep as said above you gotta stop before 5k I didn't give it full throttle as I'm still during the break-in period but only 3/4 throttle and it did it anyway.

I was driving in sport + mode

keep in mind that if the egt or the inlet temps are too high the car won't do it (and it won't even burble anymore)
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      11-09-2017, 02:10 PM   #52
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on the topic of EGT can this be measured by just using an obd II device and getting it from the ECU? or is it possible that reading can be inaccurate?
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      11-10-2017, 10:36 PM   #53
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Quote:
Originally Posted by Perp View Post
Tried the wot till 4.5, 4.7, 5k and lift with no bang yet. I'll keep trying lol
Quote:
Originally Posted by kab_m2 View Post
You gotta go wot at 4K then release just under 5k
How are you guys doing this without just spinning the tires? When I go WOT in 2nd anywhere above 3k RPM it just spins em and kicks the rear end out. Have tried it a few times at 70% throttle but no bang.
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      11-11-2017, 02:20 AM   #54
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Quote:
Originally Posted by BimBimma View Post
Quote:
Originally Posted by Perp View Post
Tried the wot till 4.5, 4.7, 5k and lift with no bang yet. I'll keep trying lol
Quote:
Originally Posted by kab_m2 View Post
You gotta go wot at 4K then release just under 5k
How are you guys doing this without just spinning the tires? When I go WOT in 2nd anywhere above 3k RPM it just spins em and kicks the rear end out. Have tried it a few times at 70% throttle but no bang.
My thoughts exactly! I go around 70% throttle in 2nd and it spins.... Can't see just revving to 4k them going wot and not have my traction control light up lol. Maybe in summer when I actually have traction
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      12-17-2017, 08:10 PM   #55
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Can anyone film/record what the 'bang' sounds like? Mine tend to sound more like farts!
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      12-17-2017, 10:14 PM   #56
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Quote:
Originally Posted by Perp View Post
My thoughts exactly! I go around 70% throttle in 2nd and it spins.... Can't see just revving to 4k them going wot and not have my traction control light up lol. Maybe in summer when I actually have traction
I actually have gotten it to happen a few times now. Usually have to give a hard pull through 1st and 2nd and then lift and it'll bang once like a gunshot.
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      12-17-2017, 11:12 PM   #57
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Quote:
Originally Posted by atlas View Post
Can anyone film/record what the 'bang' sounds like? Mine tend to sound more like farts!
Only happens in 1st and 2nd gear between 4-5000 rpm in sport plus mode. You have to step on the gas and then let go.



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      01-07-2018, 03:29 PM   #58
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guys I discovered how to make my M2 LCI backfire (aka "gunshot bang") in a RELIABLE way.

the sound produced is exactly like the one captured by andrewc89 video. Thanks for showing the correct rpm range sir

2nd gear, sport mode, just below 4000rpm, floor it to 5000rpm and let go.... bam

In my car, it only works in sport mode, not sport plus nor traction mode (haven't tried comfort or TC off).

I tried in sport plus many many times but I was getting only a muffled sound and sometimes a "fart".

Sport mode is the key

PS:
For reference, here's the pic of my NBTevo version... no idea what ISTEP/Frimware I have


Last edited by Alby_416; 01-07-2018 at 06:24 PM..
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      01-07-2018, 04:19 PM   #59
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Quote:
Originally Posted by Alby_416 View Post

In my car, it only works in sport mode, not sport plus nor traction mode (haven't tried comfort or TC off).

I tried in sport plus many many times but I was getting only a muffled sound and sometimes a "fart".

That's kind of weird, i'm pretty sure mine only backfires in Sport +.

2017, 6MT, 200cell sport cat, Remus catback, NBTevo L17193I, stock ecu tune

I'll have to give regular Sport mode a try and see what happens.

Last edited by AndrewC1989; 01-07-2018 at 04:31 PM..
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      01-07-2018, 06:23 PM   #60
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Quote:
Originally Posted by andrewc89 View Post
That's kind of weird, i'm pretty sure mine only backfires in Sport +.

2017, 6MT, 200cell sport cat, Remus catback, NBTevo L17193I, stock ecu tune

I'll have to give regular Sport mode a try and see what happens.
yeah man that's weird but couldn't make it happen in sport plus... and I really tried

my car is all stock + MPE, 2018, DCT
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      01-08-2018, 11:12 AM   #61
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When you guys with the MPE are doing it...do you have flaps open or closed?
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      01-08-2018, 03:17 PM   #62
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Quote:
Originally Posted by Alby_416 View Post
guys I discovered how to make my M2 LCI backfire (aka "gunshot bang") in a RELIABLE way.

the sound produced is exactly like the one captured by andrewc89 video. Thanks for showing the correct rpm range sir

2nd gear, sport mode, just below 4000rpm, floor it to 5000rpm and let go.... bam

In my car, it only works in sport mode, not sport plus nor traction mode (haven't tried comfort or TC off).

I tried in sport plus many many times but I was getting only a muffled sound and sometimes a "fart".

Sport mode is the key

PS:
For reference, here's the pic of my NBTevo version... no idea what ISTEP/Frimware I have

interesting, mine makes the muffled sound with the new update, but i have yet to try this in regular sport mode, as soon as the snow melts away i will give this a try thanks
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      01-08-2018, 03:18 PM   #63
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Quote:
Originally Posted by m2ruder View Post
When you guys with the MPE are doing it...do you have flaps open or closed?
I tried again today and it works both with flaps open or closed
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      01-08-2018, 03:24 PM   #64
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Also, I noticed that I can make it backfire easier if I let off the gas exactly when the needle hits 4500rpm in 2nd gear... If I try to do it at 5000rpm it works maybe 1 out of 5 times.

I have DCT, not sure if that makes a difference compared to the MT.
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      01-09-2018, 01:11 PM   #65
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Car will backfire in Sport/Sport+ and DSC off (even more) rpms will vary in whether backfire bang or pops/crackle
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