08-23-2021, 05:16 PM | #1 |
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extended TPMS data?
I came across this in a random tack vid today.
I'm aware that speed can be coded but haven't seen extended TPMS data with PSI and temps before. Love this data during track sessions. |
08-23-2021, 05:30 PM | #2 |
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Drives: 328d Wagon, M2 Comp, i4 eD35
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This info has been able to be coded for quite a while on the Fxx platform. I did it on my wagon back in 2016.
The temperature isn't very useful though (absolutely not a replacement for a proper pyrometer).
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08-23-2021, 05:38 PM | #3 | |
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Quote:
I do find temps useful during the session though. e.g. on clockwise track with predominantly right turns. If I see my inside rear temps getting excessive I can adjust my methods. Likewise for outside front.... The whole truth doesn't come out though until later with data analysis |
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08-23-2021, 05:51 PM | #4 |
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Canada cars by default use the wheel speed sensors to detect low pressure, so PSI isn’t displayed. But you can code it in.
Some guys in the US actually code their cars like yours so the TPMS doesn’t trigger below 27psi and send the car into Comfort mode when starting with cold tires. For me, I use the psi read outs when on track, and used to start PSI at 26 if needed (depends on tires, setup, and track conditions), reset TPMS in the pits before rolling out, and use the brakes on the out lap to heat up the tires above 27psi before the TPMS finishes its reset. The data on screen is valuable, as you’ll be able to see hot lap temps and pressures, which are drastically different from what a lot of guys do and read them in the paddock after a cool off lap and the inevitable heat soak from the brakes into the tires while you’re running around the car checking pressures—that’s trash data. And we only use the pyrometer on race days (diff car), it’s overkill for HPDE and you have to do quick hot pits in/out with a team member for the data to be consistent and worthwhile. TPMS display and watching tire wear is good enough for HPDE. A side note that most of the pressure/temp increase on our cars (esp the OG’s) is from poor brake ventilation and sizing. Once I switched to AP brakes, I did not have to start with such low pressures bc the heat management is better and the temp/pressure increases are less, so I never get any low starting pressure TPMS fits. |
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08-23-2021, 06:49 PM | #5 |
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That's great information, thanks!!! I didn't realise that CDN cars were using speed sensors. I'm in the process of gathering info for a full on track build while I'm hunting down the right car for the build. I had AP brakes on my E92 M3 and absolutely loved them. they will be top priority on the M2C |
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08-23-2021, 08:51 PM | #6 |
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I believe with the M2C that BMW Canada had switched to having TPMS, the original M2s, at minimum 2016 and 2017s are speed sensors but I think they may have switched to TPMS with some 2018.
Having said that, I think others have also reported that the TPMS system was not quite as nerfy as it was on at least 2016-2017 US M2s. Apparently they will still warn with very low pressures but you don't get automatically bumped out of DSC Off, MDM Modes or Sport+ anymore. I can't speak to the accuracy of the data from the TPMS systems since my 2017 doesn't have it but I would have been interested in seeing it myself. I wouldn't expect to take the values as absolutely true but would have liked to be able to see the changes and have more data for seeing when how quickly tires have warmed up, when they may be too hot, etc. Sure, you can feel that but it'd be interesting to see the data trends at least. Especially when I was still learning rapidly (I was still quite a novice when I got my M2), it's also be interesting to see with different tire compounds like I'm experiencing this year as I can't get stock of tires that I want. |
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08-24-2021, 10:36 AM | #9 |
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