System-G wrote:Do up the wheel nuts in opposites.
I torque mine up to 100NM, go for a drive and then re-torque to 140NM.
Not had them loosen like that, but I have forgotten to torque up a wheel at all once.
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before going out on track.
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thats FAR too tight.
85-100Nm is what they should be torqued to, just the once, and not retightened once hot.
if wheel nuts are loosening then there are issues beyond the torque settings, you should never need to go higher, and doing so risks pulling a wheel stud through, which is equally as likely to lose you a wheel as under tightening
(within reason)!
as for the original posters question, are the nuts the correct nuts for the job? look at the way they locate on the wheel, are they tapered, flat with sleeves, or just totally flat? and what torque are you doing them up to? if you havent torqued them properly then thats your first job, torque them to 90Nm and see what happens.
dont overtighten them though.
if theyre still coming undone then youve got something more wrong
just a quick check to make, are the wheels hubcentric? and is the hubcentric bore correct? if you dont know what this means, then hubcentric is the location method for the wheel, there is a large bore in the middle of the wheel which slots over a corresponding outer bore on the hub.
the wheel sits firmly on this so that all the wheels do is hold it against the hub, the hubcentric system locates the wheel centrally and longitudinally.
chances are that unless these wheels were Toyota fitment they will have a larger centre bore
(if they had a smaller bore you wouldnt have got them on) and thus the wheel nuts are all that is locating the wheel centrally.
this often doesnt work and allows the wheel to vibrate and work loose, not to mention the fact it might not be concentric and will cause your car to drive like it has egg shaped wheels! if the hubcentric bore is wrong then youll need to get spigot rings to sort it, however ive never managed to find spigot rings for sale which fit other std manufacturer wheels to the MR2, only spigot rings for larger bore aftermarket wheels.
so you might have to get some machined
also, check the offset of the wheels, if it isnt between ET35-42 then you might want to consider spacers too
