Hino Tyre Pressure

[homeless]

I am setting up a tyredog for my bus and trailer and wanted to set the correct high and low settings for the tyres.
I have been running 80PSI all round on the bus using 700 x 16 12ply tyres and 45psi on the trailer using 185 x 14 8ply
I can use up different settings for each axle so want to set a realistic high and low. The high would be for summer increase when driving and the low would be for cold in winter but not tooo low to set the alarm as soon as the pressure reduces. On setting up the tyredog I have found that the 80PSI I set in hot weather has now reduced to low 70's so a drop of 10psi from hot to cold I assume as they are all about the same.
The Hino manual only gives reading for 10ply max @75psi.
I have been told I could run up to 100psi using 12ply.
I have searched for recommendations via Google but get little info. any tyre experts out there who can give me advise.
I want to set it up so I will know when a tyre starts to deflate but allow for cold settings so it does not go off when I stop and the tyres go cold.
If I set for say 70psi for the bus cold and say 100 for high eg hot day driving would that be too wide a range or should I set for now eg winter and then reset as the days get hotter, or should I set the low pressure to just a few PSI under the 80PSI so as soon as I loose a few PSI the alarm will be set.
Should I re inflate the tyres for 80 PSI cold NOW or would the 75psi for the 10ply be OK for the 12ply as well.

The trailer tyres I usually inflate to 45psi as the trailer is reasonably heavy 1.4tonnes on single axle. so looking at 40psi low and perhaps 60psi high as the other day driving they were about 52PSI while driving on a cold day from 45PSI cold start. Surprising the difference from one side to the other, I assume from the cold wind on one side (wind side) and warmer on the other even though in the shade most of the trip.
The tyredog also gives temps for each tyre so wonder if a hot bearing etc would increase the temp in the tyre. Have lost my RF thermometer (must have lent it to someone) so might have to get another.

Well boys what do you think I should do besides just set to what I have and see how it goes.

Regards
Brian

[jon_d]

Brian,

what do the stamps on the tyres say?

Mine are like 115 psi max at 20*

jd

[homeless]

Hi Jon
Will look in the morning as too bloody cold outside tonight.
Be glad to leave Victoria. Been here since Nov so about time to move further afield I think.
Regards
Brian

[T1 Terry]

I'm running 100psi in 12 ply rated on the Mazda. Unfortunately, one of the tyres turned out to be 10 ply and it let go big time on the way back from down the coast, but not a sign of trouble before that, so maybe it was a coincidence and not related to the pressure at all. By running the 100psi the fretting of the wheel lock rim and rusty marks has stopped, generally a sign that the pressures were too low before.
So, if you run 80psi cold, that should climb to around 95PSI hot, as 100psi is safe set them at 100psi high and 75psi cold. That's my suggestion. The trailer I would run 45psi cold, 60 psi high alarm, 40psi low alarm.

[homeless]

Thanks Terry.
That's what I have set for a a basic setup but was not sure.
I am going to pump the tyres up to the 80PSI again tomorrow. Will give the boat battery a good test as I need to pump up 8 tyres.
Will be able to see what the pressures climb to as I drive along so will get a better idea once I get back to driving.
Was going to leave here tomorrow but after a bad day raining and one of the locos giving up the ghost did not get much done.
Regards
Brian

[PandJ R away]

Hi Brian

Winter is coming up here to. 18 degrees last night Brrr.

I had / have Tyredog on the Coaster. It has provided me with another 'leisure' activity while travelling and another gauge to watch while driving. I have broken 4 wheel sensors now, two from road damage i.e. impact or cracked caps from stones or whatever allowing contaminants into the circuitry and 2 from corrosion in the sensor probably due to water ingress past the seal or a leaking battery.

I found that the temperature info was at least equal in value to the pressure reading and probably more predictive than pressure. So far the temp reading has alerted me to 2 separate problems with bearings and brakes. This has probably saved me more than enough to pay for the tyre dog system. Slow leaks have never been a concern for me as my normal checking pick them up. Blow outs especially on the front are my fear.

The accuracy of the readings varies with each sensor and rarely agrees with pressure gauges which of course don't agree with each other either. I carry a 'special' guage ( big numbers, large dial - poor eyes esp. at night) and use it as my 'standard'. Each of the T/dog sensors can vary 4+- psi from this. I just note that and accept a difference on the display. Really what matters in a change in pressure not the pressure reading itself.

I probably have the temp and pressure ranges set a bit close but I don't mind being alerted to changes and then to make decisions about what the readings point towards. Many times we haven't stopped, just noted the change in conditions. I alter the settings occasionally to suit the current conditions e.g. road temperature.

I think the replacement sensors are expensive relative to the cost of the initial unit ( 6 sensors) and I have delayed buying replacements. I have considered buying a cheaper system and investigated some alternatives and so far done nothing.

When I had the Mitchellin tyres fitted to the rear the fitter looked up a set of tables based on axle weights and tyre characteristics and provided me with a set of pressures for both brands I use. I have more faith in a table than a stranger telling me a number based on their experience. Wear patterns so far have been good.

The sensors make a bit of a job of adjusting tyre pressures especially at the rear. The security screws make this worse.

I see the Tyredog system as an alert to change not as a measuring instrument much like the temp gauge in the dashboard i.e. not accurate but one indicator of what is happening in the vehicle.

When are you going to come north again

John

[homeless]

Hi John.
I will only use it to get an idea what is going on.
I had a blow out on a trailer tyre before xmas and did not know until I saw that the trailer was not level in the rear view camera.
The wheel was warn down to the brake drum and even all the brake bits were gone.
That episode cost nearly as much as the 8 station tyre dog.
I have left a fair range for weather changes but I will see how it goes.
I am heading north but into SA. Be a long time before I head into QLD as I am a bush camper so will stay south. Besides there is lots to see in VIC and SA that I have not seen so cant see the reason to run north and south just because the weather changes.
Often the best times are when everyone else has gone and leave the sights nice and quiet. Besides I do carry jumpers and coats and I dont mind the cold as I am still in shorts and no shoes .
Regards
Brian

[PandJ R away]

I have to report that it dropped well below 18 last night. Being the tropical wuss that I am, I had to get my winter blanky out to watch the news.

We are off to the block in a minute. Its up in the hills behind the coast, only 410m but it has a whole different climate. Magnificent clear skies and cold but at least we can have a good fire and a few rums to wash down the roast.

John

[homeless]

I am heading west to SA.
Be in Nyhal tomorrow night for a few days and then Dareton for a day or two and then head of to SA and then north.
Hopefully it will be warmer up there.
Regards
Brian