raising center of gravity

[Wambat]

hey guys,

i want to raise my tray to tie me over until i can afford to build a whole new one, i just have a standard large tray on my 75.

i want to raise it 100mm, how adversely will it effect my cog?? i know it will effect it, but will it make nearly bugger all difference, or will it make heaps of difference?? i only want to do it at the moment for two reasons, one to run my exhaust properly, and two to stop my tyres rubbing on the rails of the tray just above my chassis,

i am assuming that 50mm would be half as tippy as 100, so should i just do 50 then if i am worried??




i eventually want to sell it though, so i dont want to cut it up to much(if i raise it the bar at the top will be to high, and i want to cut it down, once i sell it i want to make one up to suit my application, and chop the chassis at the same time.

should i just do it and see how it goes? or does any one know from experience that it will feel less stable when travailing rough terrain??

[BlueSuzy]

I think there is a limit about height of tailights. But on your 75', I wouldnt worry about lifting the tray 100mm.

It should be fine. A 50mm body lifted troopie's cog is changed alot more than a 100mm lifted traytop!

[danaz]

It wouldn't raise the cog much just lifting the tray, it's the weight that you put on the tray that you would notice a lot more.

A simple way to get a bit of an idea of the effect it will have would be to compare the weight of the tray to the sprung mass of the entire car (basically everything but the axles). For ease of comparison lets say the sprung mass is 1500kg and the tray weighs 150kg. Raising the tray 100mm would have the same effect as raising the suspension 10mm. It's not that simple but will give a bit of an idea.

[Wambat]

no worrys, sounds like a plan then

[hurricane]

i think it would be pritty unlikely that u will notice any differnece to the point that the car will be more unstable.

[toughnut]

I raised the tray on my patrol for the same reason. Didn't notice a difference with my driving anyway. Not until I did a lot of other work to the suspension but I had a custom tray by that stage. Depending on what you're carrying on the tray it should only equate to a couple of degrees lean angle.

[Wambat]

i cary one tool box that is centered against the back wall near the cab, that would wiegh in at about 30 kg, and another one that is on the drivers side, that carrys recovery equipment, wouldnt weigh to much, only has hand winch and straps, wire is in the other box.


i will also mount my spare on the tray when i raise it. i try to drive fairly slow and controlled, so hopefully wont be an issue