Attempt at making a TPMS fooler
01-11-2006 | 12:49 AM
#1
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Attempt at making a TPMS fooler
Anyone care to guess what this is that I am making? Care to wager if it will work or not? I will do a DIY if it does work.
Last edited by carbonRX8; 01-12-2006 at 09:01 AM.
01-11-2006 | 03:54 AM
#2
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I'm guessing you got new wheels and didn't want to put the TPMS in them for the reason of balance and etc.. So you've made this tube in which you will fill up with air to simulate the pressure in your tires in hope of tricking the computer in to thinking your sensors are in. (My bet is it will work 
) hope i'm right
) hope i'm right
01-11-2006 | 08:01 AM
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Well looking over some older threads like this https://www.rx8club.com/series-i-tech-garage-22/disabling-tpms-18784/ I am lead to believe the TPMS system gathers more than just .PSI data. So filling that tube to 32 lbs will not fool the TPMS system. BUT adding air to that tube might be enough to turn the TPMS sensors on and you could then scan what radio frequency they transmit on? That information would be needed to make a TPMS ‘fooler’
01-11-2006 | 08:57 AM
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Originally Posted by expo1
Well looking over some older threads like this https://www.rx8club.com/showthread.php?t=18784 I am lead to believe the TPMS system gathers more than just .PSI data. So filling that tube to 32 lbs will not fool the TPMS system. BUT adding air to that tube might be enough to turn the TPMS sensors on and you could then scan what radio frequency they transmit on? That information would be needed to make a TPMS ‘fooler’
Critters,
Sex aid?
What are you into?
01-12-2006 | 09:00 AM
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Well, the house lost. (assuming I reset the system correctly) I finally got all the leaks sealed, but the blinky light came back on. What that means is that the sensors are triggered by the centrifugal force of spinning or that they send that signal to the TPMS receiver. Next would be to dig in to the sensor to see if you could fool it to send the correct signal.
I will say this. I think that the TMPS responds differently to advancing number of drive cycles. When I first replaced the wheels, the light would come on after, say, 20 min. Eventually it would beep at me and come on sooner. The very last time before trying my fooler the light came on immediately. Dont know what that means.
I will say this. I think that the TMPS responds differently to advancing number of drive cycles. When I first replaced the wheels, the light would come on after, say, 20 min. Eventually it would beep at me and come on sooner. The very last time before trying my fooler the light came on immediately. Dont know what that means.
01-12-2006 | 09:11 AM
#11
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Originally Posted by carbonRX8
What that means is that the sensors are triggered by the centrifugal force of spinning or that they send that signal to the TPMS receiver.
I will say this. I think that the TMPS responds differently to advancing number of drive cycles. When I first replaced the wheels, the light would come on after, say, 20 min. Eventually it would beep at me and come on sooner. The very last time before trying my fooler the light came on immediately. Dont know what that means.
I will say this. I think that the TMPS responds differently to advancing number of drive cycles. When I first replaced the wheels, the light would come on after, say, 20 min. Eventually it would beep at me and come on sooner. The very last time before trying my fooler the light came on immediately. Dont know what that means.
01-12-2006 | 10:24 AM
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Originally Posted by expo1
Yes, to save battery life they are activated by tire rotation. This is the second year of my use of winter tires without TPMS and yes at first it takes 15-20 minutes for the warning light to come on. The longer you ‘ignore’ this light the faster the light will come on, I just cover the light and never see it.
Any more ideas on this would be appretiated. After I extract my sensors, I would be happy to donate them to the cause as a test bed.
Could a mod please retitle this thread to better indicate what it is? Thank you!
01-12-2006 | 10:29 AM
#13
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Originally Posted by carbonRX8
I am going out an buying some flat black (non-glossy) stickers right now.
Originally Posted by carbonRX8
Any more ideas on this would be appretiated. After I extract my sensors, I would be happy to donate them to the cause as a test bed.
01-12-2006 | 02:00 PM
#14
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Originally Posted by expo1
Before you open them up finding someone that could try and get the RF would be better I think.
01-12-2006 | 02:14 PM
#15
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Originally Posted by carbonRX8
But if the rotation of the wheels turns them on, wouldn't it just be better to scan a stock car in motion or just resently stopped after a short drive? If mine arnt on, you wont get a signal? BTW do you have a scanner?
01-12-2006 | 04:24 PM
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Originally Posted by r0tor
the tire rotation pushed the battery against the contacts in to give it power... so no centrifigal force, no battery touching the contacts and no signal (as you have just found out)
01-12-2006 | 04:36 PM
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Originally Posted by Rotary Rasp
Why didn't you just epoxy them to the inside of the rim before you mounted the tire. I'm sure that would work.
01-12-2006 | 04:37 PM
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Originally Posted by r0tor
the tire rotation pushed the battery against the contacts in to give it power... so no centrifigal force, no battery touching the contacts and no signal (as you have just found out)
01-13-2006 | 11:05 AM
#21
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Originally Posted by carbonRX8
So they have to be wedged and then under pressure? Do you have more info? circuit discriptions? rf frequencies?
If that works you won't need to worry about RF sniffers, demodulating signals and decoding the data packets. I'm an EE. I have the right equipment in my lab and I would still find such a task a major, major PITA (so major I stuck with TPMS compatible rims and ponied up $160 for a second set). You'd need to get good data from a properly installed an happy TPMS to compare too.
If you are worried about battery life (by having it powered 100% of the time instead of whatever % of time you drive) - if you check the voltage of the battery you could wire all 4 to an external battery back.
01-13-2006 | 11:23 AM
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Originally Posted by Cool-Blue-Dad
Actually, this sounds like a good reason to go ahead and open of the sensors. Find the battery and contacts and wire it up to be always on. You might be just that close to kludging around the problem.
Thanks Zoom, for the thread name change!
Last edited by carbonRX8; 01-13-2006 at 11:26 AM.
01-13-2006 | 01:14 PM
#23
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Originally Posted by carbonRX8
Anyone care to guess what this is that I am making? Care to wager if it will work or not? I will do a DIY if it does work.
Good idea and good luck but hope to god you never get stoped driving into the airport. I can just imagine trying to explain what that is to the cops.
02-19-2006 | 07:42 PM
#25
it won't work, i've already tried this. the TPMS sensors also send out wheel speed information. if the car is in motion and doesn't detect wheels speed from the sensors, it'll still set off the light.