Vehicle & Technical > Discovery
Tyre Pressures - Again!
Wireless:
Ok, did a maximum load calculation for my usage of the Disco (assuming you're right about a 75kg driver included in kerbside weight), including towing, and from calculation I reckon I should be running 30psi front and 39psi rear.
For driving about in it on my own I should run 28psi front and 31psi rear, I have to admit the front tyres do seem soft at 26psi all the time, and the rear a bit hard at 34psi when I'm in the car alone.
Mmm...
Me thinks that for long journeys I should work out a loading vs tyre pressures matrix sheet to keep in the Disco, and possibly keep a record of mpg figures at different loadings/pressures.
Damn, this is turning into some sort of project.
Jimbo:
I've been running my BFG AT's at 30psi front, 42 rear - the Disco is always well loaded with tools/testers etc. I've just replaced the BFG's with General Grabber AT2's (no BFG's in the country, and no date for their arrival !), got the tyre place to go for 30psi front and 42 rear and the truck is all over the place - either their airline gauge is knacked or perhaps the General's are a bit stiffer in the sidewall ? Going to check the pressures with my own gauge which seems to be fairly accurate.
Range Rover Blues:
Wirelss, just to make things a bit more complicated, you know how tyres tpressures are suposed to rise when the tyre gets hot? well the rear tyres run in the shaodow of the fronts and on some carts this means that the rear tyres heat up much more than the front.
Wireless:
--- Quote from: Jimbo on April 10, 2008, 18:31:03 ---I've been running my BFG AT's at 30psi front, 42 rear - the Disco is always well loaded with tools/testers etc. I've just replaced the BFG's with General Grabber AT2's (no BFG's in the country, and no date for their arrival !), got the tyre place to go for 30psi front and 42 rear and the truck is all over the place - either their airline gauge is knacked or perhaps the General's are a bit stiffer in the sidewall ? Going to check the pressures with my own gauge which seems to be fairly accurate.
--- End quote ---
I bet the max loading and max pressure at cold is lower on the AT2's (when you state stiffer sidewalls), and running the same pressure as your BFG's is causing the new tyres to be over inflated?
Not sure what size BFG AT's you had but to help the 235/70 16's has max 900kg @ 50psi.
Wireless:
--- Quote from: Range Rover Blues on April 10, 2008, 19:00:30 ---Wirelss, just to make things a bit more complicated, you know how tyres tpressures are suposed to rise when the tyre gets hot? well the rear tyres run in the shaodow of the fronts and on some carts this means that the rear tyres heat up much more than the front.
--- End quote ---
mmm...could explain a few things, do you have any links for this?
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