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Well I didn't know that

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#841 ·
ArcElectric said:
The tire pressure monitoring system (TPMS) can generate multiple alarms at once.

Had all of them go off in one alert, then the front passenger (which has been plugged once) went off seperately this morning. All were okay, except the plugged one, which was down 5 psi. They were already warm though, so will wait till they cool down and recheck/fill/reset system.
Click to expand...
I really wish Polestar had given us real TPMS sensors rather than cheap & inaccurate rotational speed crap. :(
 
#843 ·
#844 ·
#845 ·
2RatsElop said:
How does it work when you change tyres (twice a year in my case) or when their battery runs out?
Click to expand...
£50 per set of wheels (4 sensors) - If you change rims then get a second set of sensors if changing tyres only remind the garage to be careful - you can replace the valve stems without the sensors but I've not needed to yet.
Regarding battery replacement - The BLE sensors only wake up & transmit once every minute or so when you're driving so last for ages. I've one BLE set for my A4 for 3 years one on the PS2 no problems and 2 similar RF non-BLE sets for my TT for 5 years.
It's a bit of a headache having to open the app on you phone to check for the BLE ones but saved me pulling onto the had shoulder when the PS gave me an erroneous tyre low warning on the way up to Scotland 5 weeks ago.
Like 'proper' TPMS you get a prompt pressure, temperature and sensor voltage reading for each wheel within 30 seconds or so of setting off.
 
#847 ·
#848 ·
I'd like to add a little to the TPMS discussion, as I see quite a few complaints in the forum about the fact that the P*2 has iTPMS (indirect measurement by calculation), instead of dTPMS (direct measurement though pressure sensors).

I believe not only Polestar are moving away from dTPMS in favour of iTPMS, but that it is becoming the new industry standard.

Although dTPMS is theoretically more precise, it does present a number of inherent challenges that manufacturers (especially the more safety conscious ones) have been trying to avoid.

1. Batteries tend to run out, and there is nothing less safe than a safety system that isn't working.
2. The sensors are part of the wheel, rather than the car, so owners with aftermarket wheels or several sets need to make sure that compatible sensors are fitted to all wheels. If my colleagues are anything to go by, most people don't bother and live with the warning lamp for half of every year.
3. The stems break suddenly, which might be dangerous and is certainly irritating when it happens.

My personal experience with the dTPMS system that I have in my current car is that it doesn't provide exact readings. The sensors (even the OEM ones) are produced quite cheaply and not calibrated particularly well. As having the exact pressure readout on the dash brings out my OCD, I have spent quite a few hours trying to get the pressures spot on only to find that the sensors disagree with external pressure guages by several decibars.

I fully support drivers like JohnnyFarmer in his belt and braces approach to mounting aftermarket TPMS sensors, but Polestar have made a conscious decision not to provide them as standard, not out of cheapness, but for the safety reasons above. The indirect approach, although it doesn't tell you the exact tyre pressure, is more reliable and gives good enough information to keep you safe.

iTPMS Advantage | The smarter choice.

itpmsadvantage.com itpmsadvantage.com
 
#849 · (Edited)
Has anyone tried something like these - looks better than having to rely on an app on your phone.
www.amazon.co.uk

MOREBA 【2022 Newest Version】 Tyre Pressure Monitoring System, Auto Alarm and Real Time Detection Display, Solar Power Large LCD Display with 4 External Sensor, C270 : Amazon.co.uk: Automotive

Buy MOREBA 【2022 Newest Version】 Tyre Pressure Monitoring System, Auto Alarm and Real Time Detection Display, Solar Power Large LCD Display with 4 External Sensor, C270 at Amazon UK. Free delivery on eligible orders.
www.amazon.co.uk
 
#850 ·
BedsPolestar said:
Has anyone tried something like these - looks better than having to rely on an app in your car.
www.amazon.co.uk

MOREBA 【2022 Newest Version】 Tyre Pressure Monitoring System, Auto Alarm and Real Time Detection Display, Solar Power Large LCD Display with 4 External Sensor, C270 : Amazon.co.uk: Automotive

Buy MOREBA 【2022 Newest Version】 Tyre Pressure Monitoring System, Auto Alarm and Real Time Detection Display, Solar Power Large LCD Display with 4 External Sensor, C270 at Amazon UK. Free delivery on eligible orders.
www.amazon.co.uk
Click to expand...
Would you seriously install this inside the car ? This would be like a punch in your face. The App seems to me a more subtle way to get the missing functionnality.
 
#851 ·
JRRF said:
Right. I've seen some explanations, but I don't buy any of them.
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There's one reason, and one reason only. Any other reason is BS.

iTPMS is FREEEEE!

dTPMS costs MONEY! Sensors, cables and interface in the car, transducers in the wheels.

iTPMS solves the immediate problem of handling punctures, but you miss out on all the other tangential benefits of dTPMS. It is literally a second-best, low cost solution, and to claim otherwise is just dishonest.

This is going to be another of my boring BMW posts... but the system on the BMW was brilliant. It was instant reading - you could actually top up the tyres whilst watching the screen. It was incredibly accurate, and - most importantly of all - it was temperature compensated. It would dynamically update the target pressure based upon the temperature. It also had a database of wheel + tyre combos, so when you switched to your winter wheels, one click changed to the right settings.

And none of this is new - this was all five+ years ago...
 
#853 ·
JohnnyFarmer said:
£50 per set of wheels (4 sensors) - If you change rims then get a second set of sensors if changing tyres only remind the garage to be careful - you can replace the valve stems without the sensors but I've not needed to yet.
Regarding battery replacement - The BLE sensors only wake up & transmit once every minute or so when you're driving so last for ages. I've one BLE set for my A4 for 3 years one on the PS2 no problems and 2 similar RF non-BLE sets for my TT for 5 years.
It's a bit of a headache having to open the app on you phone to check for the BLE ones but saved me pulling onto the had shoulder when the PS gave me an erroneous tyre low warning on the way up to Scotland 5 weeks ago.
Like 'proper' TPMS you get a prompt pressure, temperature and sensor voltage reading for each wheel within 30 seconds or so of setting off.
Click to expand...
Must be something about driving to Scotland as mine went off too when we were up there and everything ok! Maybe the car was enjoying the roads too much and didn't want to leave.
 
#854 ·
Oddly, I don't really mind the ITPMS. That's weird for me, because I'm a numbers guy. I guess it's because dTPMS has been a bother to me in the past. My wife, for example, gets very worried when things are off by only a little bit. I've also had the batteries wear out and had to deal with additional sets on winter wheels.

I don't want to start a fight, but are the benefits worth the extra complexity?
 
#859 ·
ProfessorCook said:
Oddly, I don't really mind the ITPMS. That's weird for me, because I'm a numbers guy. I guess it's because dTPMS has been a bother to me in the past. My wife, for example, gets very worried when things are off by only a little bit. I've also had the batteries wear out and had to deal with additional sets on winter wheels.

I don't want to start a fight, but are the benefits worth the extra complexity?
Click to expand...
I'm in agreement with you. I've had cars with dTPMS and it was more of a nuisance than they were worth. It's not as if they self inflated, so I'd still have to inflate and look at the tire pressures as I did that. And like you, swapping between winter and summer wheel tire sets NEVER went smoothly. There'd always be one sensor that wouldn't register or had some sort of issue.

I'm already checking/adjusting pressures on occasion, when visually inspecting the tires, before a roadtrip or spirited drive. So for me, iTPMS does the only thing I really need it to do, which is give a warning resulting from a slow leak (obviously I'll notice a blowout), and I'm happy to do away with the unnecessary (to me) added systems.
 
#860 ·
ProfessorCook said:
Oddly, I don't really mind the ITPMS. That's weird for me, because I'm a numbers guy. I guess it's because dTPMS has been a bother to me in the past. My wife, for example, gets very worried when things are off by only a little bit. I've also had the batteries wear out and had to deal with additional sets on winter wheels.

I don't want to start a fight, but are the benefits worth the extra complexity?
Click to expand...
Agree! I can live without TMPS at all, can't see how driver managed before this hyped security item, for me dTPMS is just money down the drain.
 
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