TPMS settings
Can anybody help just taken delivery of a Bailey unicorn Cartegena fitted with TPMS and I cannot find what I should set the highest and low pressures and also the temperature. The dealer on delivery stated it was up to me what they were set to, not the best advice.
Thanks for any info.
Comments
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I can't see the logic of setting the lower pressure much lower than the cold static pressure, as any drop is time to know, not after its lost another 10 psi.
The higher pressure is not really a worrying issue, they will get as hot as they get carrying the load, if set with the right initial cold pressure.
My Goodyears rise from their set 65 to about 80 psi on a hot day on Southern French motorways with sun on the road and tyre wall. I can't alter that; 65 is the maximum cold pressure and I accept Goodyear know their business technically. So set well up and see how things go.
To me identifying loss of pressure is all TPMS are there for and the only thing I can react to.
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Do you know what system it is? The default temperature setting on mine is 70C and the hand book says that should be fine for most uses. There are no recommendations for pressure alarms but I have set my low one to 5psi below cold pressure and the high pressure to about 12psi above cold pressure. I always adjust the cold pressure for changes in ambient temperature i.e. between summer and winter and find in practice the on the road pressures can increase by as much as 10psi as the tyres warm up. Hope that helps.
peedee
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I seem to remember that when I bought the monitor for the pre-installed system on my Barcelona, the instruction book gave quite detailed instructions as to what the alarm settings should be and it was worked out in percentage terms. In practice, however, the alarm settings aren't that important since my display is right in front of me and I can constantly see if there are any trends that might be starting to give cause for concern.
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I have just checked in my Tyrepal book, the system fitted by Bailey, as far as I know. It states
We recommend the high pressure alert is set 20% above the manufactures recommended temperatureand low pressure alert 15% below. The temperature alert applies to all tyres . The factory default is 70C and we recommend this is not changed.
My U2 Cadiz is specified at 60 psi so I have set the high at 72 and low at 51. So far in this country, even in summer this has been OK. The most they have risen to even on a very hot day was 70psi. Hope this helps.
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Can anybody put up a logical argument supporting running up to 15% under the right tyre pressure before drawing attention to it?
To me that results in undue tyre wall distress, let alone inevitably making snaking more probable, neither things I would recommend as at all acceptable.
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One thing owning a TPM has brought home to me is how much cold pressures can vary with changes in ambient temperature. I bought the system last March and it's first real outing was on our tour in May / June. At the start of our tour, at the beginning of May, day time temperatures were in single figures. Three weeks later in the west of Scotland they were in the mid 20's. Significant adjustments were required to keep the cold pressures at 60 psi.
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If I understand the system correctly it alarms before it reaches the low pressure warning if the leak is significant. a loss of more than 2psi in a minute is mentioned. I assume the 15% is specified to stop an alarm on a very cold morning when the system wakes up. If I only set it to 2 or 3 psi. There is often at least that variation on cold mornings.
However, as already mentioned above, the screen on the tyrepal system is right in front of you. I always check as it wakes and throughout the journey. So it would be rapidly apparent if there was an issue.
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The cold morning argument does not appear to be the underlying reason in that we should check they are at the specified correct cold pressure anyway, irrespective of that cold ambient.
If we did not bother then given the case of a 60 psi cold tyre pumped up at 15 C, that at 0 C would be down by only 6.5%, under 4psi.
I still feel that running at 15% under inflated before being warned by the alarm is unwise advice.0 -
Ocsid, I agree with what you say and from my observations your figure of 4psi is about right for a swing of 15C. Given all you are interested in is whether the tyre is maintaining pressure or not I think it is better to set the low alarm to less than15 percent below cold pressure. Setting mine at 5psi below cold pressure equates to about 8 percent.
peedee
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Perhaps the tyre pal people have tried to be a bit simpistic in having only one figure. Certainly peedee figure of 8% would seem adequate on the caravan tyres. However, on the car particularly when running solo, where tyre pressures are only in the low 30's, might lead to false alarms.
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After using this system on our 2 year old Unicorn since new, I think that you will soon notice any loss of pressure or even any out of balance pressures (right to left!). I seem to check my Tyrepal screen quite regularly when towing. A 15% drop in pressure from 60 psi at cold is only 9psi. Considering that the pressures on the move rise to over 70psi... my experience doing two early summer trips to France in warm weather is that a reasonably high upper pressure nearer 20% is required
A friend of mine set his Tyrepal with a lowish (5%) upper pressure limit before alarm and very soon found that the alarm went off before he got 10 miles from his storage site.
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