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Post by stanleyb on Jan 11, 2017 21:00:00 GMT
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Post by MartinT on Jan 11, 2017 21:22:23 GMT
Interesting. Do you have to get the wheels balanced again with them fitted? Can they display Bar rather than PSI?
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Post by kettlechips on Jan 11, 2017 21:55:16 GMT
We fit the similar TyrePal aftermarket system at work. That system can certainly be set to show psi or bar. The manual says that they do not need the wheels re-balancing, but we always do a rebalance anyway as a matter of course.
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Post by zippy on Jan 12, 2017 9:16:49 GMT
How accurate are they ?
My Subaru came with built-in pressure sensors but they've never triggered even when one of the tyres was about 5psi too low as measured by a 'proper' gauge.
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Post by stanleyb on Jan 12, 2017 10:10:59 GMT
The one I got seems quite accurate. I checked the tyre pressure a the petrol station before fitting the sensors. They both registered the same pressure reading.
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Post by kettlechips on Jan 12, 2017 12:31:40 GMT
Agreed, the TyrePal system is accurate - we check with our own pressure gauges, which are regularly calibrated, the gauges at filing stations are not always accurate. You can set alert levels to whatever value you want including over inflation (can happen when the tyres get hot) The settings can be different for the front axle, rear axle and even the spare tyre. I like to keep the spare tyre on the highest pressure required for the vehicle, and not everyone checks the spare regularly.
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Post by zippy on Jan 12, 2017 13:05:23 GMT
Agreed, the TyrePal system is accurate - we check with our own pressure gauges, which are regularly calibrated, the gauges at filing stations are not always accurate. You can set alert levels to whatever value you want including over inflation (can happen when the tyres get hot) The settings can be different for the front axle, rear axle and even the spare tyre. I like to keep the spare tyre on the highest pressure required for the vehicle, and not everyone checks the spare regularly. That's a bit more subtle than the Subaru system, whose function is only to give you a warning when the tyre is below a certain pressure - it can't tell you the current pressure and the alert level is effectively fixed. Maybe that's why is has some leeway in it.. |
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Post by MartinT on Jan 12, 2017 14:07:03 GMT
I need new tyres soon and have an annoying slow puncture in one of them. I may treat myself to a set of these at that time.
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Post by Greg on Jan 12, 2017 19:30:21 GMT
Let's hope the kids craze for collecting dust caps doesn't return.
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Post by MartinT on Jan 29, 2017 15:13:39 GMT
I bought the Carchet system and installed it yesterday. Very nice system, easy to install and I didn't need the o-ring seals. Simple to switch to bar for the pressure readings, too. I now need a short gooseneck extension for my cigarette lighter socket which is too deeply recessed to allow me to check the readings while driving.  Works a treat. Thanks for the tip, Stan! |
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myles
Rank: Trio
Posts: 153 
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Post by myles on Jan 29, 2017 16:34:39 GMT
Just bear in mind that some older TPM systems work on rolling circumference to determine if a tyre is deflated.
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Post by MartinT on Jan 29, 2017 16:47:16 GMT
They tend to be the manufacturer's built-in systems. My BMW used the ABS sensors to read the difference between rotation of the two wheels on an axle to determine whether one had deflated. It didn't measure pressure at all.
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myles
Rank: Trio
Posts: 153
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Post by myles on Jan 30, 2017 13:26:36 GMT
That (BMW) is my first experience of TPMS also Martin. I'm not sure if I see the need really.
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Post by stanleyb on Jan 30, 2017 15:38:49 GMT
That (BMW) is my first experience of TPMS also Martin. I'm not sure if I see the need really. Well my wife likes to drive her tyres into the ground, unless I notice that they look too flat. By that time one or more of them has been ruined. Only yesterday I measured just 11 SPI on one rear tyre! It had a nail in it. She hadn't even noticed anything wrong! The two fronts were worn down because of incorrect pressure. So I had to fork out on several tyres plus tracking this morning. I got a set of those sensors to fit on her car tomorrow, weather permitting. |
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Post by MartinT on Jan 30, 2017 15:39:56 GMT
There is a real need with runflats as you can't initially feel anything except a slowly dawning realisation that the handling is all skewed in one direction. Better to have an immediate alert to confirm what is going on.
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myles
Rank: Trio
Posts: 153
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Post by myles on Jan 30, 2017 18:31:30 GMT
There is a real need with runflats as you can't initially feel anything except a slowly dawning realisation that the handling is all skewed in one direction. Better to have an immediate alert to confirm what is going on. I ditched the runflats as soon as I possibly could; I forgot to mention that bit. |
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Deleted
Deleted Member
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Post by Deleted on Jan 30, 2017 18:40:21 GMT
They tend to be the manufacturer's built-in systems. My BMW used the ABS sensors to read the difference between rotation of the two wheels on an axle to determine whether one had deflated. It didn't measure pressure at all. That system works as it gives a warning when a tyre is more than a few ppsi below the set level. Just need a few miles running. Checking the valves regularly with a pressure gauge is recommended. Pressure sensors are usually an optional extra. Don't think any will help if you have a sudden loss of pressure. |
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Post by MartinT on Jan 30, 2017 19:13:01 GMT
There is a real need with runflats as you can't initially feel anything except a slowly dawning realisation that the handling is all skewed in one direction. Better to have an immediate alert to confirm what is going on. I ditched the runflats as soon as I possibly could; I forgot to mention that bit. So did I!!! Been running on my favourite Hankook V12 Evo2 ever since, on the BMW and now on the Honda. |
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myles
Rank: Trio
Posts: 153
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Post by myles on Jan 30, 2017 21:13:38 GMT
I ditched the runflats as soon as I possibly could; I forgot to mention that bit. So did I!!! Been running on my favourite Hankook V12 Evo2 ever since, on the BMW and now on the Honda. I'm not sure what age your BMW is but mine is a 58 and the runflats of that time were made of Bakelite. The worst ride ever, on a car whose ride is already a little confused. 4 x GoodYear Asymmetric 3 later and the ride is all but sorted. |
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Post by MartinT on Jan 30, 2017 21:21:54 GMT
It was a 2008 335d M-Sport Coupe (now sold). The runflats were Bridgestone and they may as well have been polished steel drums. The ride was harsh, the grip in the wet poor and the grip in snow non-existent. A set of Hankooks sorted that. The same tyres on the Honda are epic - it corners on rails.
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