Lug nut torque

[RacerBill]

The factory specs for my car (83 Shelby Dodge Charger) call for 80 ft lb torque on wheel lugs. Does that sound about right?

Thanks.

[x-ring]

My Datsun manual calls for 75 lb-ft, so I don't find 80 surprising.

[joeg]

Racerbill--Never doubt factory specs if you are using OEM studs, lugnuts and wheels.

[racer_tim]

80 lbs is what I use on my Race Rabbit.

[924Guy]

I use 100 ft-lbs. But my factory spec is 90, and that's with 14mm studs (stock). 80 is very normal for 12mm studs, which I'd expect you have...

[Bill Miller]

85 ft-lb on the Rabbit, w/ studs. IIRC, isn't the issue w/ over-torquing more of a problem w/ warping rotors, than anything else?

[itmanta]

I had been tightening to 100 ft/lbs on my 12mm studs until last friday. I was checking torque on my wheels and found two studs that kept turning. I said WTF! as I tried to remove the wheel one of the studs just spun? Well I managed to remove the lug nuts, the wheel, the caliper, and the brake disk. I found that the stud had stretched and actually caused a shinking of the knurled area of the stud. The butt of the stud was even convex! those were H&R studs. ARP here we come.

[Marcus Miller]

Originally posted by itmanta@Sep 5 2005, 08:45 PM
I had been tightening to 100 ft/lbs on my 12mm studs until last friday. I was checking torque on my wheels and found two studs that kept turning. I said WTF! as I tried to remove the wheel one of the studs just spun? Well I managed to remove the lug nuts, the wheel, the caliper, and the brake disk. I found that the stud had stretched and actually caused a shinking of the knurled area of the stud. The butt of the stud was even convex! those were H&R studs. ARP here we come.

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IMHO 100 is too high for 12mm studs; I run 85ft/lbs on my Pro7 with 12 mm studs and have never had a problem with wheel nuts loosening. This was with factory Mazda mags and now Panasports.

Marcus

[itmanta]

Yep, I replaced the 12mmX1.5 with ARP 1/2-20's. I will stick to around 80-90 with those.

[x-ring]

Minor hijack -

Originally posted by itmanta@Sep 7 2005, 09:52 PM
Yep, I replaced the 12mmX1.5 with ARP 1/2-20's.

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So just out of curiosity, why did you switch to 1/2-20? ARP makes 12x1.5 studs. Did you just have a burning desire to buy new lug nuts?

[joeg]

1/2 is clearly stronger than a 12mm--given the same metallurgy.

[itmanta]

"So just out of curiosity, why did you switch to 1/2-20? ARP makes 12x1.5 studs. Did you just have a burning desire to buy new lug nuts? "

The knurl diameter on the 12mmx1.5 studs were too small for my hubs. Shucks, now I cannot use my cool Zenkei forged aluminum lugnuts.

[ITANorm]

http://www.rbinc.com/

Click on "wheel hardware" and then "wheel studs". There are hundreds of different designs. It may take some looking, but I'll bet you can get some.

[m glassburner]

The factory calls for 80 also on alloys for my dodge....but after seeing an unusual wear pattern on my race rims (bbs rvs and ar 24s) I called auto tire and asked what the manufacter calls for on these rims, 65 lbs....Have not had any problems since...I know it sounds low I suggest calling the maker of the rims...each alloy and the process in the way they are made are different