stuck on Dynamic Mode - BMW K1600 Forum : BMW K1600 GT and GTL Forums
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post #1 of 24 Old 05-04-2019, 01:26 PM Thread Starter
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stuck on Dynamic Mode

Has anyone out there ran into this issue.I owned a 2018 GTL and I changed riding mode to dynamic but do not like the backfire noise on de-accelerate. Tried moving back to road but mode will not change. I have tried when bike not moving and when riding. I dont get why BMW programmed that burble sound into dynamic. I installed Rehmus cans on my GTL a few weeks ago and that noise is even more irritating now.
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post #2 of 24 Old 05-04-2019, 01:52 PM
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Hmm never heard of that. I’d try disconnecting battery for a bit to see if it resets?

Had 2014 gtl premium spring 17 - winter 2019 (rode 25k miles). Bought used Wing to try out (10k miles), Nah-too boring and slow. Like GTL better, bought another GTL. Ha.
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post #3 of 24 Old 05-04-2019, 01:56 PM Thread Starter
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Thanks Scotty. I will try that. Whats strange is that when setting rain or road it shows up on the screen but does not replace the dynamic word on top right screen above bike emblem.
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post #4 of 24 Old 05-04-2019, 02:04 PM
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Are you pulling in the clutch lever after scrolling to the desired mode?

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post #5 of 24 Old 05-04-2019, 02:06 PM
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No idea how to get it out of dynamic mode (pull the battery cable?)

The burble sound is not 'programmed in'. It is the byproduct of a high performance engine being run at its near optimal potential in combination with a free flowing exhaust. In any high performance engine it is difficult to optimize the size of the throttle body across such a wide range of throttle (airflow) requirements. (0-8000RPM). The throttle body delivers air, and there are going to be points in the air/fuel map which have the engine running slightly rich. One example of this is when you suddenly back off the throttle (decel) the throttle bodies closing faster than the fuel map is ready for so you end up with a greater fuel/air ratio and unburnt fuel outside of the combustion chamber. Couple this with hot exaust gases and the suddenly richer oxygen content at the end of the pipe and you get combustion induced fuel ignition. You can cure this by;

Don't use dynamic mode
Decrease the flow in the exhaust (adding more flow will make it worse as you experienced).
It can be tuned out with a different engine mapping but you will end up with other side effects

That burble, believe it or not, is a good thing, most high performance vehicles do this, watch a race sometime and you will see it happen when the car decelerates suddenly - typically setting up for a corner. It means that your engine is running on the right side of its fuel/air ratio for overall performance and its a small price to pay for maximum open throttle performance.

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post #6 of 24 Old 05-04-2019, 02:18 PM
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To see the change from dynamic to rain or road, select the new mode while riding, then just back off the throttle and give it gas again, it should then flip...at least that is how I do it. I never bother with the clutch or anything else...

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post #7 of 24 Old 05-04-2019, 03:16 PM
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Using the shift assist, I get a bit of burble even in Road mode when downshifting and the engine braking pulls it up above 3500 or so. I like the sound.

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post #8 of 24 Old 05-04-2019, 04:18 PM
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Quote:
Originally Posted by Up 2 It View Post
To see the change from dynamic to rain or road, select the new mode while riding, then just back off the throttle and give it gas again, it should then flip...at least that is how I do it. I never bother with the clutch or anything else...
Select Mode, then pull clutch and selected mode will be activated. If you dont pull the clutch display reverts back and mode stays on.

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post #9 of 24 Old 05-04-2019, 04:21 PM
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Quote:
Originally Posted by earthling View Post
No idea how to get it out of dynamic mode (pull the battery cable?)

The burble sound is not 'programmed in'. It is the byproduct of a high performance engine being run at its near optimal potential in combination with a free flowing exhaust. In any high performance engine it is difficult to optimize the size of the throttle body across such a wide range of throttle (airflow) requirements. (0-8000RPM). The throttle body delivers air, and there are going to be points in the air/fuel map which have the engine running slightly rich. One example of this is when you suddenly back off the throttle (decel) the throttle bodies closing faster than the fuel map is ready for so you end up with a greater fuel/air ratio and unburnt fuel outside of the combustion chamber. Couple this with hot exaust gases and the suddenly richer oxygen content at the end of the pipe and you get combustion induced fuel ignition. You can cure this by;

Don't use dynamic mode
Decrease the flow in the exhaust (adding more flow will make it worse as you experienced).
It can be tuned out with a different engine mapping but you will end up with other side effects

That burble, believe it or not, is a good thing, most high performance vehicles do this, watch a race sometime and you will see it happen when the car decelerates suddenly - typically setting up for a corner. It means that your engine is running on the right side of its fuel/air ratio for overall performance and its a small price to pay for maximum open throttle performance.
There is a pronounced difference between road and dynamic mode. In dynamic mode it has an accentuated synthetic backfire that BMW programmed in. Same thing in many cars by now. They just add a few drops of fuel to create this. The burble I like too and I agree fully with your explanation.

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1967 HD FL Police
2018 BMW K1600 GTL (sold)

2014 BMW K1600 GTL (sold)
2005-2014 5 HD ElectraGlides (sold)
2003 HD Softail (sold)
1973-1982 various jalopies (gone)


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Last edited by ViennaK; 05-04-2019 at 04:25 PM.
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post #10 of 24 Old 05-04-2019, 04:34 PM
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Quote:
Originally Posted by ViennaK View Post
Select Mode, then pull clutch and selected mode will be activated. If you dont pull the clutch display reverts back and mode stays on.
It's not the clutch, the engine mode only changes when the throttle is released. If CC is on, it maintains throttle so the mode won't change. I just blip the throttle (letting go of course) and it does fine.
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