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      07-01-2019, 06:02 AM   #1
DoZZa
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TPMS Threshold

Hi guys, I'm currently at the Nurburgring and am having annoying issues with the TPMS sensor.

It's very hot here at the moment and I am having to drop the pressures to around 24psi to see good pressure on track.

But or course the TPMS kicks off when the tyres have cooled down and pressure drops. Won't allow Sport+ to be enabled and can't turn off DSC.

Is there a way of coding in a lower threshold for the TPMS, something like 23psi would be ideal!

If seen how to disable the TPMS via coding, but I want to avoid doing that as I am constantly looking at then tyre temps and pressure.

Any ideas?

Thanks
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      07-01-2019, 11:30 PM   #2
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Wish I knew the answer, the TPMS has been the bane of my existence with the M2. I have trouble getting the right tire pressure every track day. I usually have to start ~ 28 to avoid being forced into comfort, but this of course turns into 39 hot on track. good luck.
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      07-05-2019, 12:55 PM   #3
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This is a big problem with the M2 and I have tried to code the warnings away with no luck. So I try to keep the temps high when I track the car and dont take long brakes that results in locked comfort mode.

I will give the coding another try, and if I am not lucky I will give up TPMS.
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      07-05-2019, 01:58 PM   #4
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Set your tire pressures to 23psi and do a TPMS reset via the menu. It will complaint if you’re 15% lower than the 23 psi threshold then, but it won’t if you’re over. That way you can go Sport + or DSC off right away and it will stay that way when tires heat up and pressures go up.
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      07-05-2019, 02:44 PM   #5
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Quote:
Originally Posted by 5.M0NSTER View Post
Set your tire pressures to 23psi and do a TPMS reset via the menu. It will complaint if you’re 15% lower than the 23 psi threshold then, but it won’t if you’re over. That way you can go Sport + or DSC off right away and it will stay that way when tires heat up and pressures go up.
Hm. Does that actually work? I thought it would also trigger if you go over a specific threshold, not just under.

Also I thought it had to stay in comfort during the reset period?
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      07-05-2019, 02:49 PM   #6
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Worked for me at the track. I reset it at 28psi and it didn’t complain when I got to 38 after 15min of hard laps.
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      07-06-2019, 11:57 AM   #7
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It does not complain when the pressure rises only when you go under 1.8 bar or 26psi.
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      07-06-2019, 11:57 AM   #8
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Quote:
Originally Posted by 5.M0NSTER View Post
Worked for me at the track. I reset it at 28psi and it didn’t complain when I got to 38 after 15min of hard laps.
38psi on what tires?
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      07-06-2019, 12:00 PM   #9
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Quote:
Originally Posted by 5.M0NSTER View Post
Set your tire pressures to 23psi and do a TPMS reset via the menu. It will complaint if you’re 15% lower than the 23 psi threshold then, but it won’t if you’re over. That way you can go Sport + or DSC off right away and it will stay that way when tires heat up and pressures go up.
This does not work as the car will lock in Comfort and no DTC off if you try to reset under 27psi. I have tried this several times.
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      07-08-2019, 05:26 PM   #10
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Quote:
Originally Posted by DoZZa View Post
Hi guys, I'm currently at the Nurburgring and am having annoying issues with the TPMS sensor.

It's very hot here at the moment and I am having to drop the pressures to around 24psi to see good pressure on track.

But or course the TPMS kicks off when the tyres have cooled down and pressure drops. Won't allow Sport+ to be enabled and can't turn off DSC.

Is there a way of coding in a lower threshold for the TPMS, something like 23psi would be ideal!

If seen how to disable the TPMS via coding, but I want to avoid doing that as I am constantly looking at then tyre temps and pressure.

Any ideas?

Thanks
Curious what hot temps are you targeting and which tire are you using? I never had to go less than 27-28 cold with my Michelins or Contis.
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      08-05-2019, 03:04 PM   #11
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Quote:
Originally Posted by landapanda View Post
Curious what hot temps are you targeting and which tire are you using? I never had to go less than 27-28 cold with my Michelins or Contis.
This was a big problem for me at the 'Ring, I shall try 23psi next time!

The tyres are Michelin Cup2's, OEM sizes.

Aiming for 36psi in the front and 33psi rear when hot.

However, I have noticed that each set of tyres (same brand and series) behave differently. So what might work well for one set of Cup2's, might not necessarily work for the next set.

I can tell you that small changes make big differences with this car and the Cup2's, finding the sweet spot can sometimes be difficult.
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      08-05-2019, 05:23 PM   #12
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Does it unlock dsc off and sport + when the pressures rise, or will I need to pit, turn off the car, and restart?
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      08-05-2019, 09:38 PM   #13
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Quote:
Originally Posted by dvas View Post
Wish I knew the answer, the TPMS has been the bane of my existence with the M2. I have trouble getting the right tire pressure every track day. I usually have to start ~ 28 to avoid being forced into comfort, but this of course turns into 39 hot on track. good luck.
I tried it all, but finally gave up and removed TPMS and coded the car with euro M mode. I have over 50 track days since coding and have no issues on street or track. Even without TPMS it still warns if one tire gets too low compared to others.
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