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Re:Tpms question

  • zebraman
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23 Aug 2020 21:09 - 23 Aug 2020 21:10 #227235 by zebraman
Replied by zebraman on topic Tpms question
What I don't get is when I had the wheels and tyres replaced the garage swapped the tpms sensors over, set the pressure to 38 then reset tpms. I went home and dropped it to 26 then 24 and no alarms. Now I've gone to 22 it's gone off

The tpms has two settings in the menu comfort and off-road or something. I might set it to the off-road and see what happens.

Worst come to worst I'll pop it back up a psi or two.
Last edit: 23 Aug 2020 21:10 by zebraman.

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23 Aug 2020 21:30 #227238 by Roger Fairclough
Replied by Roger Fairclough on topic Tpms question
Please don't take this as an insult to your abilities, but what gauge are you using and are the tyres at ambient temp.

Roger

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23 Aug 2020 21:50 #227240 by Soeley
Replied by Soeley on topic Tpms question
As far as I know the system doesn't recognise over pressure only under.
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  • CC Baxter
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23 Aug 2020 22:42 #227241 by CC Baxter
Replied by CC Baxter on topic Tpms question
You could fool the system by attaching the TPMS sensors with there special tyre cores to an air tank set at the required pressure and fixed somewhere inside the engine bay. If properly made it should hold it's air pressure for a decent period of time.
Anybody want to give it a go?
No you can't do that Roger, the system just doesn't check pressure it checks movement. If the tyres aren't rotating you won't get a reading. Chris

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  • GeorgeC
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24 Aug 2020 05:28 - 24 Aug 2020 05:29 #227244 by GeorgeC
Replied by GeorgeC on topic Tpms question
Email exchange with Bridgestone, they confirmed the "26psi" is at ambient temperature.

I argued for the tyres to be set at ISA and the TPMS calibrated accordingly.
This method would remove the need to adjust the pressures as the ambient temperature varied up or down. (same for altitude)

He did give me the Static Loaded Radius for their original Bridgestone 195 80 R 15 tyre, factory fitted to the Jimny, so the inflation pressures (altitudes) and load measurements can be compared or confirmed.
Last edit: 24 Aug 2020 05:29 by GeorgeC.

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  • Lambert
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24 Aug 2020 06:45 #227247 by Lambert
Replied by Lambert on topic Tpms question
Perhaps if they had coded the tpms to look for a difference in readings taken over 24 hours it would be a more effective system ie check every second compared with the figure from the same time 24 hours previous that way it's a relative measure and can warn of an issue but also allow for alternative terrain and tyre type pressure.
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24 Aug 2020 07:35 #227253 by mlines
Replied by mlines on topic Re:Tpms question

Lambert wrote: Perhaps if they had coded the tpms to look for a difference in readings taken over 24 hours it would be a more effective system ie check every second compared with the figure from the same time 24 hours previous that way it's a relative measure and can warn of an issue but also allow for alternative terrain and tyre type pressure.

Yes, there is a reset facility invoked by a door opening and closing sequence, but that currently just redetects the sensors You would have thought they could have made that "set" the warning level to 1 PSI below current tyre reading. That way you could have set the tyres to the pressure you want and coded the alert accordingly.

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24 Aug 2020 10:15 #227267 by Soeley
Replied by Soeley on topic Tpms question
Just found THESE doesn't seem a bad price for 4. Anyone know anything about them or experience?
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24 Aug 2020 10:24 #227270 by CC Baxter
Replied by CC Baxter on topic Tpms question
I think there was a young lady on this very forum talking about these. Initially she had trouble programming them but I think all was resolved. Chris

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24 Aug 2020 11:02 #227274 by Scimike
Replied by Scimike on topic Tpms question
Never considered the fact that these devices have a battery fitted that will need replacing at some point. Assume this is true of them all?
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24 Aug 2020 11:30 #227276 by CC Baxter
Replied by CC Baxter on topic Tpms question
True indeed Mike, quality ones are guaranteed 3 yrs (probably last 5) cheap ones well.... Chris

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24 Aug 2020 12:17 #227279 by Soeley
Replied by Soeley on topic Tpms question
I thought they were powered by some kind of induction created by centrifugal force, hence they only give a reading after driving a few yards.
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