you heard wrong. tighten them til you can't tighten them anymore by hand. if you're using air, tighten them til the gun stops.
I have a gun that you wont ever stop, it will spin away with a snapped off stud in your socket.
and yes it can warp your rotors by over torquing. You heard right
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they should be tight, (80-85 ft/lbs ^), but i dont think i would say till you cant do it anymore by hand. if you're using a 1/2" ratchet then that might be about right. if you're using a 4-way however you could very well break off one of the studs. also, not all air guns are the same. setting the impact gun to its highest setting might not be advisable.
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I use whatever. Sometimes a 3/8 socketwrench, sometimes a 1/2 impact. It's not like I sit there and hammer it down on the impact, only takes a split second or so.
But I never tighten mine too much, there's no reason to. I hate taking others off that are torqued down like crazy. Never had a problem w/ mine comming lose from the cheapest lug nuts available, to expensive ones, from stock steelies to aftermarket aluminum wheels.
People tent to over torque things thinking that it's going to fall off if they don't. It's like hearing about people snapping or stripping bolts/threads on their valve covers when they can be tightened down with your fingers basically. I personally use a screwdriver w/ 10mm socket on it to do mine just so i never do that ;x
^ w3rd. you can overtighten your lugnuts, but you gotta be a real "musle man". with the right tools you dont have to worry. use an eletric impact and let it max for a couple seconds. really, its not that big of a deal when using good tools.
or if youre tightening lug nuts with a torque wrench, just use standard specs. its kind of a simple theory..
I had hoped you'd be able to solve the mystery of why some aftermarket wheels request a different torquing.
well the torque value depends on the stud and nuts strength mainly. but when the wheel is a different material (IE Aluminum) it tends to need less as when the rotor heats up the heat passes into the wheel. heat will soften the rim meaning you can actually warp the wheel if the studs are too tight. I know there is more info on this than my $.02 worth
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