03-18-2020, 02:11 AM | #1 |
Captain
756
Rep 785
Posts |
exhaust pops
Featured on BIMMERPOST.com This is more curiosity just because i find my experience to be pretty different compared to what i've seen online. Sport+ mode. |
03-18-2020, 02:47 AM | #2 |
Lieutenant
290
Rep 408
Posts |
The M2C definitely pops and burbles a whole lot more than the OG.. and I'm curious why you don't hear any pops or burbles. When the engine is warm, in sports plus, try bringing the rpm to 3k and hold for a a few seconds and then just let off the gas all at once. It should pop and burble quite a bit when you do.
|
Appreciate
0
|
03-18-2020, 08:33 AM | #3 | |
Major
1575
Rep 1,049
Posts |
Quote:
|
|
Appreciate
0
|
03-18-2020, 11:00 AM | #4 | |
Captain
976
Rep 843
Posts |
Quote:
|
|
Appreciate
0
|
03-18-2020, 12:24 PM | #5 |
Major
450
Rep 1,358
Posts |
Efficient mode no pops or gurgles. Sport and Sport + seem to be about equal on off throttle pops. I've got the MS exhaust but don't think that changes the programming that opens the valves.
I've also noticed when on it hard and up-shifting in sport and sport + it will make a brief whoosh noise. Could be wastegate noise I suppose |
Appreciate
0
|
03-18-2020, 02:17 PM | #6 |
Brigadier General
3871
Rep 4,040
Posts
Drives: 2020 M2C, 2019 330xi, 2017 Q7
Join Date: Jan 2012
Location: Washington DC Burbs
|
|
Appreciate
0
|
03-18-2020, 05:33 PM | #7 |
Lieutenant Colonel
2485
Rep 1,602
Posts |
You kind of have to rev it a bit, but also the burbles are pretty hard to hear from inside. The car makes two distinct “backfire” noises in the US, the normal burbly noises, which it does for a couple of seconds off throttle in sport and sport+ as well as a louder “braap” sound when getting off the throttle under high load/high RPM. That sound will happen even in efficient mode, and sounds just like a DSG fart. I believe I have the same setup as you, US market with a 6MT and the louder DSG fart sounding noise kinda took me by surprise as i never really heard it before the break in service.
I’m pretty sure it’s caused by the lack of BOV, as I’ve heard the S55 just overlaps the valves and blows the pressure wave right through the cylinders (which then theoretically spools the turbos from the exhaust side) |
Appreciate
1
robertm449.50 |
03-19-2020, 01:27 AM | #8 |
Captain
756
Rep 785
Posts |
Yeah to be more specific, i get plenty of burbles driving. Its just everytime i want to take a video of the exhaust it never seems to pop quite as much...or so it seems. Its very possible that the engine isnt warm enough or i just dont rev it high enough when im doing it.
Or i maybe dont hear it. since im inside. Maybe i'll try warming up the engine and giving it a bit more throttle next time haha. It pops quite a bit when im driving her hard though so thats always great. |
Appreciate
0
|
03-19-2020, 01:44 AM | #9 | |
Colonel
2845
Rep 2,066
Posts |
Quote:
3-5k revs- burbles with a softer edge to the sound more of the popcorn sounds. 5k and beyond provides more of a crackle with sharp pops and snaps. In my 6mt a 1-2 shift in s+ with mdm and revs over 7k provides a super sharp Snap crackle pop while waiting for the insane rev hang to go down. It's funny it stated doing it out of nowhere and now continues pretty much on command. Not sure if I'm just driving the car harder or the exhaust is braking in. Also rapping out first to 6-7 then getting all the way out of it does a straight up machine gun sound in my car. Like 8-12 crazy pops in a row |
|
Appreciate
0
|
03-19-2020, 06:32 AM | #10 | ||
Private First Class
165
Rep 171
Posts |
Quote:
|
||
Appreciate
0
|
03-19-2020, 09:16 AM | #11 |
Lieutenant
290
Rep 408
Posts |
|
Appreciate
0
|
03-19-2020, 09:37 AM | #12 |
Major
450
Rep 1,358
Posts |
I was thinking this is something you could code with Bimmercode. Poking around the net a little bit it looks like this isn't a programmable option. (Maybe I'm wrong, someone will pounce on me immediately if I am)
You can just unplug the connection at the rear exhaust valve while it's closed. Then it won't open up under any conditions. Doesn't throw a code or anything. Another option is Burger Tuning. They have a module that tunes exactly what you are looking for. Here it is: https://burgertuning.com/products/ob...e-for-f-series |
Appreciate
0
|
03-19-2020, 05:13 PM | #13 | ||
Private First Class
165
Rep 171
Posts |
Quote:
Quote:
|
||
Appreciate
0
|
03-19-2020, 05:19 PM | #14 | |||
Brigadier General
10904
Rep 4,537
Posts
Drives: 2015 328d xDrive
Join Date: Aug 2010
Location: NoVA
|
Quote:
Quote:
Quote:
https://www.cgprecision.com/#!/VSC-2...egory=34601196 Doesn't occupy your obd2 port and can be controlled using the garage opener |
|||
Appreciate
2
NYC Bimmer259.50 robertm449.50 |
03-20-2020, 12:55 PM | #15 |
Major
450
Rep 1,358
Posts |
See I knew someone would fix my gibberish
Thanks Andrew for clarifying. I wasn't even aware of bimmerlink. I bought the Veepeak OBDII adapter with intent of using Bimmercode. I will need to do more research before making an app purchase. |
Appreciate
0
|
03-20-2020, 05:30 PM | #17 | |
Major General
1543
Rep 8,972
Posts |
Quote:
Real pops disappeared with carburetors years ago. BM3 mapping options are fun, i turned mine down in duration but up in noise, nice sharp crackles now. |
|
Appreciate
1
TrentMeister2845.00 |
Post Reply |
Bookmarks |
Thread Tools | Search this Thread |
|
|