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2015+ Shelby GT350 Mustang
Lug nut torque?
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<blockquote data-quote="JAJ" data-source="post: 16041442" data-attributes="member: 131874"><p>I hear you about the Porsche center locks - I've seen them up close on race cars and when the car's equipped with air jacks, a tire change doesn't take long. In the paddock you have a four-foot long torque wrench to tighten them with, but in the pits there's no time for that so you need a calibrated air wrench to make sure you get enough torque to keep the wheel on. They do have an interesting safety feature though - presumably because there's no redundancy with a single 60mm stud, the stud has spring-loaded fingers inside it that extend out when the wrench socket is pulled away. They keep the nut from coming off if it gets loose. You can't do that with regular lugs.</p><p></p><p>As for the 150 vs 100 ft-lb discussion, I thought you'd raised an interesting issue, so I did some research and found that because of the differences in diameter and thread pitch, it takes 150 ft-lbs on an M14x1.5 to get the same clamping force as you get with a 1/2-20 stud at 100 ft-lbs. It sounds like it's a lot higher but as far as the wheels and studs are concerned, it's the same.</p><p></p><p>What concerns me about 150 ft-lbs is not the stud, it's the nut. This is not the time or the place for cheap aftermarket lug nuts. For the track, I use OEM Chevrolet open-end lug nuts or OEM Ford closed-end nuts that are rated by the manufacturer for 150 ft-lbs.</p></blockquote><p></p>
[QUOTE="JAJ, post: 16041442, member: 131874"] I hear you about the Porsche center locks - I've seen them up close on race cars and when the car's equipped with air jacks, a tire change doesn't take long. In the paddock you have a four-foot long torque wrench to tighten them with, but in the pits there's no time for that so you need a calibrated air wrench to make sure you get enough torque to keep the wheel on. They do have an interesting safety feature though - presumably because there's no redundancy with a single 60mm stud, the stud has spring-loaded fingers inside it that extend out when the wrench socket is pulled away. They keep the nut from coming off if it gets loose. You can't do that with regular lugs. As for the 150 vs 100 ft-lb discussion, I thought you'd raised an interesting issue, so I did some research and found that because of the differences in diameter and thread pitch, it takes 150 ft-lbs on an M14x1.5 to get the same clamping force as you get with a 1/2-20 stud at 100 ft-lbs. It sounds like it's a lot higher but as far as the wheels and studs are concerned, it's the same. What concerns me about 150 ft-lbs is not the stud, it's the nut. This is not the time or the place for cheap aftermarket lug nuts. For the track, I use OEM Chevrolet open-end lug nuts or OEM Ford closed-end nuts that are rated by the manufacturer for 150 ft-lbs. [/QUOTE]
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2015+ Shelby GT350 Mustang
Lug nut torque?
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