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Post Info TOPIC: Winnebago Alpine (Mazda T4000)
riccardo


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Winnebago Alpine (Mazda T4000)
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We still have our noisy beast!  It's been across to Perth a couple of times ... and a long stay in Tassie one year!.

 

One thing we've never mastered is tyre pressures.  When Winnebago de-rated the truck to make it suitable for car drivers!! , they never changed the tyre placard.  So, we tried what the placard said (80psi) and got a harsh bone-shaker ride.  Have had at least two or three blowouts over the years too!! 

Then I started to 'think' abut it.  With a GVM of 6 tonnes  plus, having 80 psi in the dual wheels might be appropriate.  With a GVM of 4.5 tonnes (plus food and clothes), it should be 15 or 20 psi lower!  Dual wheels on the rear axle mean I should NOT lower it too much in case the tyres rub?  I'm thinking I need to get down to my nearest garage and deflate the tyres to 70 psi all round.  

Are there any other T4000 owners out there with experience ... or must I re-invent the wheel?  I'm thinking the front axle carries rather less than 2 tonnes ... with the balance being carried by the dual wheels.  Do I need to verify this with a weighbridge?

 

riccardo

 

PS  My wheels and tyres are standard ... although the recently fitted wheels had a LR of 120 on them.  I used to run truck tyres with a 10 or 12 PR rating.



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riccardo Canberra ACT
Peter_n_Margaret


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You need 2 pieces of information to calculate an approximate appropriate tyre pressure which has NOTHING to do with the vehicle make or model.
1. You need a weigh bridge load reading for each axle separately for the fully loaded vehicle, ready for travel.
2. On the side of the tyre there is a maximum pressure at a maximum load moulded into the tyre. There are 2 different numbers - one for "single" and one for "dual". They are both required.
When you have all of those numbers, post them here.

No numbers, no correct pressure can be established, by ANYONE.
Cheers,
Peter

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OKA196, 4x4 'C' Class, DIY, self contained motorhome. 960W of solar, 400Ah of AGMs, 310L water, 280L fuel. https://www.oka4wd.com/forum/members-vehicles-public/569-oka196-xt-motorhome
 

 
riccardo


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Thanks for your quick reply. The beast is in storage at the south coast for the moment. As soon as we can we shall go down there and recover it. The local "tip" has said they will do the weighing for us, and then I will publish the numbers.

riccardo

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riccardo Canberra ACT
Tony Bev


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Hi Riccardo

I do not have your type of vehicle, or your number of wheels, or the same weight on my axels, so I can only generalise

As you have rightly pointed out, the tyre pressure placard means nothing, as that vehicle manufacture specified loads (truck/bus), and possibly tyres, are not the same as specified

Also bear in mind, that different tyre manufactures, can have a different LR (Load Rating), of the same size tyres, due to their different constructions
This is another reason, to look at the tyre, and not the tyre placard, Max pressure, and LR numbers

You asked, do you have to re-invent the wheel, my answer is certainly not, as there are plenty of friendly and helpful people on this forum, who will gladly do their best to help

As Peter, (Peter n Margaret), above has already said, no one can give you a correct tyre pressure to use, without the weights of each axle, the two LR, and MAX Pressure numbers, stamped on your tyres

I am sure that when you come back with your numbers, (no urgency as no one is going anywhere, due to the Coronavirus), that Peter, and/or other technical minded people will gladly explain, how they deciphered the numbers

PS, I am not a techie, I was just one of those schoolboys, who never got clipped behind the ear, as I was always eager to learn, and still learning











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Tony

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riccardo


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Thanks for the comment. It may be another month before we can get down ... and there will be mucho battery charging before we set of for a weighbridge. Have you noted they are few and far between nowadays? Riccardo

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riccardo Canberra ACT
Tony Bev


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riccardo wrote:

Thanks for the comment. It may be another month before we can get down ... and there will be mucho battery charging before we set of for a weighbridge. Have you noted they are few and far between nowadays? Riccardo

Hi Riccardo

It may be another month before we can get down ... and there will be mucho battery charging before we set of for a weighbridge

That is why I mentioned that there is no urgency, to come back with your numbers
Not sure what is happening in the Canberra area, but in my part of the world, (SW of WA), I am only allowed to travel within my regional area
Also as it is now starting to get cold, wet, and windy, I shall probably not travel until I can go and catch the sun, in the north



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Tony

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