|
Wheels | Tires | Spacers | Hub -- Sponsored by The Tire Rack Specific topics relating to wheels and tires. |
![]() |
|
Thread Tools | Search this Thread |
![]() |
#29 |
Senior Member
Join Date: Feb 2014
Drives: 2023 BRZ
Location: Denver, CO
Posts: 1,820
Thanks: 1,495
Thanked 1,268 Times in 685 Posts
Mentioned: 34 Post(s)
Tagged: 2 Thread(s)
|
While that might explain some of the discrepancies, it doesn't explain all of them. I've still seen meaningful differences between sensors on the same vehicle at a fixed altitude.
Also, explaining the difference is altitude doesn't really fix the problem. It's still a problem many people have to account for if they want accurate readings. I don't understand why people are so reluctant to check tire pressures manually. It takes almost no time or effort.
__________________
Director of Rocky Mountain 86CUP
|
![]() |
![]() |
![]() |
#30 | |
Senior Member
Join Date: Jan 2018
Drives: Crapcan
Location: Oregon
Posts: 11,415
Thanks: 18,641
Thanked 16,676 Times in 7,558 Posts
Mentioned: 110 Post(s)
Tagged: 0 Thread(s)
|
Quote:
__________________
"Experience is the hardest kind of teacher. It gives you the test first and the lesson afterward." -Oscar Wilde.
|
|
![]() |
![]() |
The Following User Says Thank You to NoHaveMSG For This Useful Post: | timurrrr (01-13-2022) |
![]() |
#31 | |||
Senior Member
Join Date: May 2019
Drives: 2022 GR86
Location: Between Sonoma and Laguna Seca
Posts: 1,722
Thanks: 2,144
Thanked 1,319 Times in 727 Posts
Mentioned: 31 Post(s)
Tagged: 1 Thread(s)
|
Quote:
We would all really appreciate it if you could just share the exact request / response protocol. I'm going to add it to my GitHub anyways, but you can just save everyone some time ![]() I promise to read more into the details of how Multi-Frame Messages work! I find "learn by studying an example" to be more effective than "learn by first solving a puzzle that requires you to already know what you want to learn to solve it". Also curious if you've confirmed if the same message format is working on the 2022 cars. Quote:
Interesting data! Quote:
even though the same pressure gauge measured the same pressure from both tires. So "0.5 psi resolution" doesn't necessarily mean "0.5 psi precision". But again, as long as you can see the general trend... This is perhaps even more interesting to log! |
|||
![]() |
![]() |
![]() |
#32 | |
Senior Member
Join Date: May 2019
Drives: 2022 GR86
Location: Between Sonoma and Laguna Seca
Posts: 1,722
Thanks: 2,144
Thanked 1,319 Times in 727 Posts
Mentioned: 31 Post(s)
Tagged: 1 Thread(s)
|
Quote:
If only doing one, using a high quality pressure gauge is probably more precise, as long as you fly into the pits at full speed, and your assistant quickly checks all four tires while they're hot. |
|
![]() |
![]() |
The Following User Says Thank You to timurrrr For This Useful Post: | NoHaveMSG (01-13-2022) |
![]() |
#33 | |
Senior Member
Join Date: Jun 2018
Drives: MR2, Sliver BRZ
Location: San Diego, CA
Posts: 312
Thanks: 5
Thanked 259 Times in 121 Posts
Mentioned: 39 Post(s)
Tagged: 0 Thread(s)
|
Quote:
Interesting thing to find about two tires being at different temps / pressures but same ambient temp. it was a conundrum that only happen at daytime but not at night. i ended up finding out with this that a parked car whos tires face the sun warm up so much it can use a super noticeable difference in PSI. by resolution i mean yes by .5. but so far ive tested with a backup manual check of my in the valve stem and for me they been all accurate with 1psi. But i do have the oem sensors. im not 100% sure if the accuracy is maintained if using aftermarket sensor though as its just a added variable in accuracy. also for what use is for simplicity. not saying you should rely on the sensors. but knowing the temp and psi help out a ton. i even did some measurements when heating the front tires when braking repeatedly with heavy breaking. Looking at the sensors and sure enough you can see the difference. let me dig up the code and and il ask my business partner if i can release the info!
__________________
Always looking to tinker with something..
|
|
![]() |
![]() |
The Following 2 Users Say Thank You to geraldjust For This Useful Post: | Racecomp Engineering (01-18-2022), timurrrr (01-13-2022) |
![]() |
#34 | ||||||||
Senior Member
Join Date: May 2019
Drives: 2022 GR86
Location: Between Sonoma and Laguna Seca
Posts: 1,722
Thanks: 2,144
Thanked 1,319 Times in 727 Posts
Mentioned: 31 Post(s)
Tagged: 1 Thread(s)
|
I FIGURED IT OUT!
To read tire pressures Request 1: Quote:
Quote:
To get the second frame, we need to send a "Continue to send request": Quote:
Quote:
I believe the encoding is: Quote:
However it's worth noting that ScanGauge seems to use a different formula: Quote:
To read tire temperatures Similar thing, just slightly different bytes: Quote:
Quote:
Thanks so much @BRZyJ for letting me play with his ScanGauge! |
||||||||
![]() |
![]() |
The Following 6 Users Say Thank You to timurrrr For This Useful Post: | BRZyJ (01-30-2022), EndlessAzure (07-13-2024), FeRS (01-02-2024), kask2_6.0 (01-30-2024), markubiak (01-30-2022), RedReplicant (07-13-2024) |
![]() |
#35 | |
Senior Member
Join Date: Jun 2018
Drives: MR2, Sliver BRZ
Location: San Diego, CA
Posts: 312
Thanks: 5
Thanked 259 Times in 121 Posts
Mentioned: 39 Post(s)
Tagged: 0 Thread(s)
|
Quote:
And to get relative pressure then ![]() so you understand how extended frames work! ![]()
__________________
Always looking to tinker with something..
|
|
![]() |
![]() |
The Following User Says Thank You to geraldjust For This Useful Post: | EndlessAzure (07-13-2024) |
![]() |
#36 | |
22R
Join Date: Apr 2017
Drives: 2012 Camry SE 2017 Toyota 86
Location: South Louisiana
Posts: 235
Thanks: 227
Thanked 140 Times in 78 Posts
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
|
Quote:
Nice Website and equipment. 22R |
|
![]() |
![]() |
![]() |
#37 |
Senior Member
Join Date: May 2019
Drives: 2022 GR86
Location: Between Sonoma and Laguna Seca
Posts: 1,722
Thanks: 2,144
Thanked 1,319 Times in 727 Posts
Mentioned: 31 Post(s)
Tagged: 1 Thread(s)
|
Looks like Autel is using ((X * 0.25) - 7.5) for psi,
which maps to ((X * 1.724) - 51.7) for kPa.
__________________
Follow the build thread for my GR86!
|
![]() |
![]() |
![]() |
#38 |
Senior Member
Join Date: May 2019
Drives: 2022 GR86
Location: Between Sonoma and Laguna Seca
Posts: 1,722
Thanks: 2,144
Thanked 1,319 Times in 727 Posts
Mentioned: 31 Post(s)
Tagged: 1 Thread(s)
|
2024 update:
__________________
Follow the build thread for my GR86!
|
![]() |
![]() |
The Following User Says Thank You to timurrrr For This Useful Post: | EndlessAzure (07-13-2024) |
|
|
![]() |
Thread Tools | Search this Thread |
|
|
![]() |
||||
Thread | Thread Starter | Forum | Replies | Last Post |
New TPMS Sensors - Car Not Reading Them | Bluesman62 | Wheels | Tires | Spacers | Hub -- Sponsored by The Tire Rack | 7 | 11-27-2016 02:41 AM |
SOLD - Set of 315MHz TPMS - $125 OBO - Tire Pressure Sensors | badamowski | Wheels and Tires | 0 | 07-16-2014 11:07 PM |
Tire Pressures | mike the snake | Wheels | Tires | Spacers | Hub -- Sponsored by The Tire Rack | 1 | 04-21-2014 05:03 PM |
Tire Rack tpms sensors | TimR | Wheels | Tires | Spacers | Hub -- Sponsored by The Tire Rack | 4 | 10-27-2013 01:12 PM |
WTB: Tire Pressure Monitoring Sensors (TPMS) | RYU | Wheels and Tires | 6 | 09-18-2012 01:52 PM |