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M2 Technical Topics > N55 Engine / Drivetrain / Exhaust / Bolt-ons / Tuning > Hidden exhaust mode in M2 (Traction Mode)

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      05-28-2017, 02:05 AM   #221
ilya335
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Quote:
Originally Posted by Artemis View Post
Here's a video of my MPE exhaust tested/filmed by a friend. He shows several modes, including the 'COMFORT' + 'DSC OFF' mode. My M2 has a manual transmission. Of course it all sounds even better when on the move under load.



My older videos of the MPE cold start sequence:
http://f87.bimmerpost.com/forums/sho....php?t=1267721
In the first portion of the video, was the car in comfort or sport/sport+?
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      05-28-2017, 05:40 AM   #222
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Quote:
Originally Posted by ilya335 View Post
In the first portion of the video, was the car in comfort or sport/sport+?
Can't say. My car, but that ain't me in the video. It's a friend doing some soft pulls (he asked me in advance - I was abroad at that time). As he didn't climb too high in the revs, hard to say.
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      09-10-2017, 05:23 PM   #223
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Still curious what exactly is happening in this mode. It is a lot louder than sport+
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      09-10-2017, 07:17 PM   #224
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This mode allows the injectors to dump more fuel leaving excess fuel in the downpipe and exhaust, being hot, it ignited and makes burbles, that's why as soon as you off throttle in mid RPM range it burbles, but when you rev is very high, no burbles as the engine will not have excess fuel to burn in the exhaust as its all consumed whilst enabling a higher engine speed.

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Originally Posted by rouxeny View Post
Still curious what exactly is happening in this mode. It is a lot louder than sport+
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      09-10-2017, 10:00 PM   #225
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Quote:
Originally Posted by iQuiet View Post
This mode allows the injectors to dump more fuel leaving excess fuel in the downpipe and exhaust, being hot, it ignited and makes burbles
Downpipe isn't accommodating any ignition event being downstream of turbine housing, the hot side of turbo.

Fuel is ignited in the exhaust manifold or turbofold, upstream of turbine.

That's why you will see much often with a NA car fire breathed out of its tailpipe - fire gets out much easier without turbo in the way.
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      09-13-2017, 12:01 AM   #226
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Iím not sure itís so much fuel being ignited in the manifold. Because I get the loudest pops and bangs when the car is cold. Itís some very smart DME mapping
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      09-22-2017, 06:07 PM   #227
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Awesome find. Very pronounced gurgles and pops with my MPE.
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      09-23-2017, 08:41 AM   #228
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did they cut this "hidden mode" in the lci?
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      09-23-2017, 08:46 AM   #229
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Quote:
Originally Posted by Aerosoul Bastard View Post
did they cut this "hidden mode" in the lci?
Why do u say that?
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      09-23-2017, 09:08 AM   #230
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my car won't react like described after pressing the dsc-button in comfort mode
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      09-23-2017, 09:28 AM   #231
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If traction mode is engaged, you're good to go. It's loudest after first 3-5 minutes.

Go into first gear review up to 3k and release the throttle, same things in second or third.

Put your windows down a bit.
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      09-23-2017, 11:30 AM   #232
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nope definitely nothing
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      09-23-2017, 12:03 PM   #233
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Quote:
Originally Posted by Aerosoul Bastard View Post
nope definitely nothing
That sucks if they took it out!
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      09-23-2017, 03:58 PM   #234
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NO?!?
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      09-23-2017, 05:18 PM   #235
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false alarm, it's still there
i'm sorry
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      09-24-2017, 04:30 AM   #236
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After installing two weeks ago the latest firmware on my '17 DCT EU spec, the car have lost almost totally the typical burbling-popping that it did before.
It's a shame but in compensation it runs better and even a bit faster.
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      09-24-2017, 11:38 PM   #237
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I have a 2018 M2 with M Performance exhaust. When I select traction mode, I can hear gun shots when after I lift my foot from the throttle at about 3500 rpm
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      09-27-2017, 04:10 AM   #238
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You guys have to go to Sports +
And get to 4,000 RPM then WOT all the way until roughly 4,700 - 4,800 RPM.
Not over, and then let off throttle, and you will all hear massive backfire from the exhaust.
May take a few times, over 4,800 RPM and it wont backfire. Give it a shot and let me know what you all think
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      09-27-2017, 04:32 PM   #239
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Quote:
Originally Posted by iQuiet View Post
You guys have to go to Sports +
And get to 4,000 RPM then WOT all the way until roughly 4,700 - 4,800 RPM.
Not over, and then let off throttle, and you will all hear massive backfire from the exhaust.
May take a few times, over 4,800 RPM and it wont backfire. Give it a shot and let me know what you all think
Other owner told me and we did it... Massive crack from the exhaust!

MR
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      09-27-2017, 08:19 PM   #240
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The backfire can also be achieved in SPORT mode as well. Preferably in 2nd gear and can do just even 75% throttle lifting off as many times are u want just below 5k RPM (don't know exact RPM) to manipulate the backfire consistently. Another easy way is when you downshift from 3rd to 2nd but make sure the REV match doesn't blip the RPM too high otherwise it won't backfire.

Also with the FABSPEED downpipe installed it can create a double backfire when u get aggressive.
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      10-29-2017, 11:26 PM   #241
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Is the stock exhaust valve closed in popcorn mode?
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      10-30-2017, 06:25 AM   #242
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Quote:
Originally Posted by dtmpower98 View Post
Is the stock exhaust valve closed in popcorn mode?
Yes. It's quieter than Sport/Sport+ It just has more pops and crackles.
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