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      08-30-2018, 02:11 PM   #1
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M2 switches from Sport+ to Comfort by itself?

This happened several times driving a student's car.

I get in, set the mode to Sport+, then deactivate DSC.

After a few laps I notice the car has reactivated DSC and is now in Comfort throttle mapping.

Any idea why this is happening? Seems pretty odd. It was a hot day but I didn't get any CELs, etc.
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      08-30-2018, 02:29 PM   #2
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The system may automatically switch to COMFORT in the following situations:
Failure of DSC Dynamic Stability Control
The vehicle has a flat tire
When activating cruise control in TRACTION or DSC OFF mode

Given the scenario, the tire pressure may have been low.
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      08-30-2018, 03:21 PM   #3
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Quote:
Originally Posted by F87 M2 View Post
The system may automatically switch to COMFORT in the following situations:
Failure of DSC Dynamic Stability Control
The vehicle has a flat tire
When activating cruise control in TRACTION or DSC OFF mode

Given the scenario, the tire pressure may have been low.
Complete flat tire isn't necessary for this to happen. As soon as the computer gets a reading from TPMS that tire pressure is below around 28, it switches the car into comfort mode. Has been the bane of my existence the last few track days.
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      09-14-2018, 01:06 PM   #4
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Quote:
Originally Posted by dvas View Post
Complete flat tire isn't necessary for this to happen. As soon as the computer gets a reading from TPMS that tire pressure is below around 28, it switches the car into comfort mode. Has been the bane of my existence the last few track days.
Yep, I never let it go below 28. First session it'll get up to like 37-38, so I'll take some more out before the second session. As long as you're hitting every session, temps won't drop enough to get below 28 before you leave the track.
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      09-14-2018, 02:06 PM   #5
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Quote:
Originally Posted by dvas View Post
Complete flat tire isn't necessary for this to happen. As soon as the computer gets a reading from TPMS that tire pressure is below around 28, it switches the car into comfort mode. Has been the bane of my existence the last few track days.
this is really a ridiculous problem to have... I wonder if you code out TPMS it leaves you alone
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      09-14-2018, 07:46 PM   #6
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Quote:
Originally Posted by dvas View Post
Complete flat tire isn't necessary for this to happen. As soon as the computer gets a reading from TPMS that tire pressure is below around 28, it switches the car into comfort mode. Has been the bane of my existence the last few track days.
I’ve had it happen during autocrosses as well. I typically set the cold pressures at the beginning of an event, and bleed down to my targets after each run. This sometimes results in a pressure drop sufficient to trigger the TPMS and switch the nannies back on.

My workaround is to reset the TPMS after setting my cold pressures, and occasionally midway through an event.
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      09-15-2018, 01:31 AM   #7
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I also do a reset proactively when I am running low pressures at the beginning of the day. I believe some guys are not running sensors on their dedicated track wheels partially for this reason. It's not that big of a deal when you know to expect it, I know some get irritated but it's important to remember this is a safety system for the masses and not for us that go to the track.
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      09-15-2018, 02:46 AM   #8
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Quote:
Originally Posted by SYT_Shadow View Post

I get in, set the mode to Sport+, then deactivate DSC.
Ummmm...Ok.

Do you even know how this works?
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      09-15-2018, 08:20 AM   #9
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Quote:
Originally Posted by Caduceus View Post
Ummmm...Ok.

Do you even know how this works?
I'm speaking from memory, the event was in june

So: car set to sport+, plus dsc off
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      09-15-2018, 08:21 AM   #10
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Quote:
Originally Posted by pruettfan View Post
I also do a reset proactively when I am running low pressures at the beginning of the day. I believe some guys are not running sensors on their dedicated track wheels partially for this reason. It's not that big of a deal when you know to expect it, I know some get irritated but it's important to remember this is a safety system for the masses and not for us that go to the track.
It's an M car. Dsc off means dsc off.
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      09-15-2018, 04:44 PM   #11
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Quote:
Originally Posted by SYT_Shadow View Post
I'm speaking from memory, the event was in june

So: car set to sport+, plus dsc off
If you turn DSC off, the car is no longer in Sport+

It makes absolutely no difference what mode it was in before you press the DSC button.
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      09-16-2018, 12:19 AM   #12
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Quote:
Originally Posted by SYT_Shadow View Post
It's an M car. Dsc off means dsc off.
Actually it doesn't. That is the basis of the discussion. We can either live in the world we have or dream about one that doesn't exist. TPMS is an important safety feature and it does make sense that during times where the system thinks the tires are not in a safe condition that would not want the DSC to be in anything other than the most conservative settings.

This is only as big of a deal as we choose to make it. For me life is too short to worry about a little nuisance like this.
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      09-16-2018, 10:42 AM   #13
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Quote:
Originally Posted by pruettfan View Post
Actually it doesn't. That is the basis of the discussion. We can either live in the world we have or dream about one that doesn't exist. TPMS is an important safety feature and it does make sense that during times where the system thinks the tires are not in a safe condition that would not want the DSC to be in anything other than the most conservative settings.

This is only as big of a deal as we choose to make it. For me life is too short to worry about a little nuisance like this.

Next up you will defend Mercedes' approach to dsc off where, after abs intervention, it reengages dsc

No M car before the M2 (maybe the M3/4 do this as well) has done this and they have had tpms since the ancient days of the E46M3.
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      09-16-2018, 06:43 PM   #14
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Quote:
Originally Posted by SYT_Shadow View Post
Next up you will defend Mercedes' approach to dsc off where, after abs intervention, it reengages dsc

No M car before the M2 (maybe the M3/4 do this as well) has done this and they have had tpms since the ancient days of the E46M3.
I get it, I really do, not defending it just saying its not worth the energy. Just enjoy the car and now that you know this issue exists it is very easy to avoid. The first time really irritated me but life is too short. Just drive it and enjoy. Blame the lawyers!!!
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      09-16-2018, 06:57 PM   #15
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Quote:
Originally Posted by pruettfan View Post
I get it, I really do, not defending it just saying its not worth the energy. Just enjoy the car and now that you know this issue exists it is very easy to avoid. The first time really irritated me but life is too short. Just drive it and enjoy. Blame the lawyers!!!
I'll follow the advice given here.

It's a student's car and it was driving us crazy. Knowing about resetting tpms will help avoid this in the future
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      09-17-2018, 08:58 PM   #16
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I don't understand why would anyone run TMPS in track wheels
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      09-18-2018, 05:54 AM   #17
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Quote:
Originally Posted by Datka View Post
I don't understand why would anyone run TMPS in track wheels
This is a student's car. He runs stock wheels
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      09-18-2018, 06:41 AM   #18
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Quote:
Originally Posted by Datka View Post
I don't understand why would anyone run TMPS in track wheels
Does everyone have a dedicated set of wheels & tires for track days?
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      09-18-2018, 09:24 AM   #19
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Quote:
Originally Posted by Datka View Post
I don't understand why would anyone run TMPS in track wheels
On the M2, tire temperature and pressure information display is super useful on track. Differentials inform driving style and when the tires start to get greasy, this info is helpful with pressure resets for the next session.
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      09-18-2018, 11:51 AM   #20
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Quote:
Originally Posted by SYT_Shadow View Post
Next up you will defend Mercedes' approach to dsc off where, after abs intervention, it reengages dsc

No M car before the M2 (maybe the M3/4 do this as well) has done this and they have had tpms since the ancient days of the E46M3.
M2 is not a real m car. I was very close to replacing my 135i with it but after driving m2 on the track at LRP and reading more about it, I just leased 340i as a daily driver.
F 8x m is the way to go. No offense to m2 owners
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      09-18-2018, 07:58 PM   #21
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First, Sport or Sport+ suck on the track and should be avoided. Second, the DSC will be turned back on in Any mode if a low temp is detected. It sucks!
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      09-18-2018, 08:01 PM   #22
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Quote:
Originally Posted by Datka View Post
M2 is not a real m car. I was very close to replacing my 135i with it but after driving m2 on the track at LRP and reading more about it, I just leased 340i as a daily driver.
F 8x m is the way to go. No offense to m2 owners

But... it is enough of an M to give your 135i, E92 M3 and 340i a royal beat down!
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