Vehicle & Technical > Discovery

Tyre Pressures - Again!

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Wireless:
I can't remember which thread it was now, but I mentioned working tyre pressures out by calculation...

Correct Tyre Pressures for your tyre/vehicle combination?

Ok, I have a nearly standard 5-door Disco V8i;

970kg kerb weight / 1100kg max weight front axle
1055kg kerb weight / 1650kg max weight rear axle

Tyres BFG AT 235/70 - 900kg max weight @ 50psi

So 18kg per psi,

That works out to;

front 26.9 min to 30.6 max psi
rear  29.3 min to 45.8 max psi

So the standard 26psi front is under pressure as no-one is driving or part of the engine has dropped on the road?

Standard 34psi rear assumes a rear axle weight of 1224kg?

Land Rover assumes a continuous load of 169kg or 23st 4lb; one fat owner back seat driving?

Ok, I give up!

Range Rover Blues:
EEC kerb weights assume a 75kg driver and full tank of gas.  If the front tyres as a little soft it's to induce understeer which is inherantly safer than oversteer.  That said thr RRC tyres presures are 28/34 but with a note that if the car is driven empty for long periods then the back tyres can be run softer for a more comfortable ride.  The LSE are 28/36 with a slightly higher rear axle load than a normal RRC.

Disco is obvioulsy heavier, but the recomended tyre pressures are based on the advice of the OEM supplier's test data and homologation testeing/performance testing of the protortype vehicles.

andyb:
Gosh that's all a rather scientific approach.......there nothing wrong with that, but....

....I usually start at 30psi all round and go from there. IME 30psi is a good starting point no matter what car it is........transit vans and upwards are a different kettle of worms :)

python:
i run my disco at 30 psi, no probs.   :)

Range Rover Blues:
Hmmm :-k, the back end will always be heavier and should thereore be higher pressure :-.

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