martyn668 Posted June 16, 2018 Author Share Posted June 16, 2018 Thanks Red 90. I wondered why Land Rover have a 28 psi:40 psi split as standard. Hi Eightpot. I could have put metric tyre pressures as well, but that doesn't change the equation. I left it in imperial because most people probably still inflate to inperial pressures. (Strangely I use imperial on the Defender, and metric on my Honda Civic! Just earsier figures to remember). The GVW is indeed 3050kg for a 90. The 5520kg is the maximum load that 4 x BFG 255/85s can run at, inflated to max pressure. However, I fully take your point that different tyres of the same size from different manufacturers would have different load ratings, so if we use the calculator on the Legacy forum cited above, then you would have to vary the pressure depending on who made your tyres. That also seems logical to me. A 10 ply carcass will be stiffer than a 3 ply carcass, so should be inflated differently. I've never seen the theory of inflating different ply / load rating tyres differently, so perhaps I'm over-thinking this. Quote Link to comment Share on other sites More sharing options...
landroversforever Posted June 16, 2018 Share Posted June 16, 2018 Where's that GVW from?! I'm sure the GVW of a 90 is only 2400kg and 2500kg for the later ones. I know mine was miss-plated from the factory and I had it corrected (to avoid the need for a class 7 MOT). The GVW will be the sum of the front and rear max axle weights. Quote Link to comment Share on other sites More sharing options...
martyn668 Posted June 17, 2018 Author Share Posted June 17, 2018 So, I wasn't too worried about GVW, because that doesn't come into the calculation. The calculatuon is maximum load capable of being supported by 4 the tyres, divided by the actual all-up weight of the vehicle. But since someone mentioned GVW, I looked it up. The official Land Rover manual for the Td5 90 (from https://workshop-manuals.com/landrover/defendertd5/general_specification_data/eec_vehicle_kerb_weights/ ) gives this: So with me in it, I'm at 2,300kg already as per the weighbridge. With the wife and two kids, I have about enough load carrying capacity for a toothbrush! I've upgraded the suspension to genuiine LR HD springs, which I think (hope) increases the GVW! Quote Link to comment Share on other sites More sharing options...
martyn668 Posted June 17, 2018 Author Share Posted June 17, 2018 Retroanaconda posted this on another topic on here back in 2009! That's bad news. Looks like the 2550kg is already the HD sprung max GVW. The wife and I will have to lose some weight, and the kids will have to stop growing. Quote Link to comment Share on other sites More sharing options...
martyn668 Posted June 17, 2018 Author Share Posted June 17, 2018 Looks like 3050kg is the GVW of a 100. http://www.landyonline.co.za/specs/landrover-defender-2013.htm Quote Link to comment Share on other sites More sharing options...
martyn668 Posted June 17, 2018 Author Share Posted June 17, 2018 110, not 100. That one unfortunately never got launched. Quote Link to comment Share on other sites More sharing options...
Retroanaconda Posted June 17, 2018 Share Posted June 17, 2018 2,300kg does seem rather heavy for a 90, but I suppose the weighbridge never lies! Quote Link to comment Share on other sites More sharing options...
Ex Member Posted June 18, 2018 Share Posted June 18, 2018 With a weekend of camping gear and two people, I got 2270 kg. 1120 front, 1150 rear. Quote Link to comment Share on other sites More sharing options...
Eightpot Posted June 19, 2018 Share Posted June 19, 2018 My 18 foot long 110" Range Rover ambulance converted to a camper, with double bed, fridge, cooker, sink, 5mm crash-winner bumpers and expedition kit is only 2200kg without passengers! Quote Link to comment Share on other sites More sharing options...
110 V8 Posted June 19, 2018 Share Posted June 19, 2018 There is a method used widely in Australia and also popular here in NZ known as the 4psi rule. Basically you measure cold pressure, drive for 20-30mins or so and measure again warm. The pressure gain due to tyre carcass flex should be about 4psi. If more than 4psi increase, the starting pressure was too low. If less than 4psi increase the starting pressure was too high. Andy Quote Link to comment Share on other sites More sharing options...
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