Wheel stud torque values 1996 F355 GTB?

On a 97 it's very low... 80 ft/lb and I checked with 2 dealers to be sure. To be honest, I never felt comfortable with that and torque them closer to 90 but don't do it because I do it... (disclaimer)

 

One other note - The lugs scratch easy which will result in premature rusting. If you don't have a padded socket, try this. Take a plastic bag that you get from the grocery store. Cut off the corner of the bag and stuff it in the socket. Thin enough to allow the socket to fit, yet provides protection from scratching the lug...

 

Check out one of this sites sponsors - hill engineering. They do replacement bolt and you may find them cheaper..

 

just so everyone is clear, they are BOLTS, not studs with nuts. I've always wondered why, as I consider changing wheels with bolts much more difficult than with studs. The Germans and Italians seem to to it that way, though.

 

The factory manual indicates (after converting back to american lb-ft) 72-75 lb-ft.

Yest these things are bolts not studs;

but in a pendanic and technical sense they are screws. Technically, if the tension is applied by turning a nut it is called a bolt. If the tension is applied by applyinig torque to the head it is called a screw. That is, if you hold the head and apply TQ to the nut -- its a bolt. If you hold the nut and apply TQ to the head its a screw. This is independent of whether the means to apply torque is a 6 sided head, or a slot, or a cross, or...

 

Gees guys, lighten up will ya? lol... a lug is anything that hold on the wheel..I guess I'm from the old racer school... Have to watch my P's and Q's..too much.

Mitch - you da man, as usual..

Fasthound - No....! It's a freakn 22mm deep. I had to go to 3 places before I could find one. BTW - I pull them about 4-5 time a year for cleaning - concours events...

 

Torque them to 72...drive it around the block. Stop and loosen the bolts while on the ground.... Takes soooo little pressure. Like a stiff wind can unscrew them. I know it's mag and all that. But I prefer a little more security and don't think 90 will stress the rim.

DISCLAIMER - I have no pecuniary gain from any potential transactions, do not remove tag under penalty of law, return your trays and seats to the full upright position, product may settle during shipping, closed roads with professional drivers, never try this at home, etc.

 

I, also think that 72-75 lb-ft is lower than what I am used to. However it is what the factory recommends. And after 32 track days, no problems so far at those TQ values.

Fastener technology is like that. Take a bolt and use it in a tension holding application. You should place the bolt above the 50% yield strength tension level for this application. Take that same bolt and use in in a shear application, you should not place the tension above the 20% yield limit of the bolt or you will be removing some of the shear strength of the bolt. Same bolt, different application, different tension, different TQ. Torque ends up being the tension force, divided by the ramp rate of the threads with a factor to eliminate the thread to thread friction while tension is being applied. That is why you should sneak up on the desired TQ value to minimize friction and use lubricant or NOT based on the manufactured directions.