Torque specs for Ferrari lug nuts ??

sounds about right, I know it looks quit low based on the size of the thread. But like everything else Ferrari nothing makes sense.

 

I wouldn't trust any table you find on the internet without knowing the source.

360 owner's manual as well as workshop manual specifies 100Nm which works out to 74 ft lb.

 

+1. The specs for the F355 are 74-75 ft/lb of torque, not 90, as indicated in this link.

 

Just had my tires replaced 2 weeks ago at the local shop. I noticed that their computer system called out 85 lbs/ft. I double check the WSM and it called out 100nm or 74 lbs/ft for the 512TR. I brought the documentation to the manager, but they said they have to torque it to their specs. Sigh, so I brought my torque wrench along - so when they were done, I loosened all the bolts and tightened it to factory specs. Moral of the story - don't believe everything out there - your best bet is the factory specs in your OM or WSM.

 

100 Nm on the 360 and 575M, 98 Nm on the 355, 550, 456/M, direct from the WSMs.

100 Nm = 73.76 ft lbs
98 Nm = 72.28 ft lbs

75 ft lbs will work for all of them and is easy to remember.

Taz
Terry Phillips

 

The 348 is actually 72ft-lbs, but as Taz says here I think 75 is a nice, round, easy number to remember

 

Hey, this thread's almost as interesting as the other seven threads on torqued nuts over the past year or so...

'bout time for another timing belt thread?

 

PS. the correct nomenclature is wheel screws (but everybody says bolts). definitely not nuts

 

Oh my god, just checked the torque on my lug nuts and one was only 69ft/lbs - whew, I'm so lucky the wheel didn't come flying off!

 

Wow! I guess that means you own a torque wrench.

 

The spec for all of the lug bolts is 100nm (roughly 75 ft/lb). I recommend using 80 ft/lb for cars that are being tracked/driven hard, and check them after you have driven the car for some miles.

 

I have nuts

http://www.ricambiamerica.com/parts_catalogs.php?M=FE&P=&V=diag&I=3196

# 18 on the above

 

Sure, some cars do. Some have just one per wheel. But not many.

Do you have big ones? I mean.... oh, never mind..........

 

Yup, thanks, I own several very good ones! But I don't use them much (head bolts excepted....) as I get a more reliable and appropriate setting by hand.

 

More reliable by hand? What does that mean? You have had wheel bolts loosen that you tightened using a torque wrench?

 

My dealer insists on using 84 ft-lbs on my 360, says the 74 ft-lbs in the manual is too low and they have encountered problems in the past.

 

Brian- The spec is not 100 Nm for all cars. Read the WSMs. The 456M WSM actually says 120 Nm, which is a real outrider, since the 456 says 98 Nm.

Erich- The term Ferrari uses is "stud bolts". Wheel screws is not used in the WSMs for any of the late model cars.

Taz
Terry Phillips

 

Is it critical? I've never torqued up wheel/lug nuts, I just lean on my 10 inch extension bar to tighten them, and have never had a wheel come loose in 25 years of owning all sorts of cars, ranging from the Ferrari to a 1932 Standard Little Nine saloon. Nor have I ever damaged or stripped a thread.

 

Interesting. BMW used to spec roughly 80 ft.-lbs. (it was actually given in n-m, 110, I think) but some years ago upped it to closer to 88 ft.-lbs. (120 n-m), I'm guessing because they were seeing too many instances of wheel bolts backing off (some insist the proper term is "screw" not "bolt" because "bolts" mate to "nuts" and of course there are no nuts for the wheels (except perhaps for the nut "behind" the "wheel") but "wheel screws" just sounds too odd to me). The idea of any torque spec is to stretch the bolt enough to put sufficient tension to keep it tight, yet not so much that the bolt fails outright or after a "normal" amount of tighten/loosen cycles. I will continue to use the Ferrari spec but I think it's wise on any car to check the torque on the wheel bolts routinely, and especially every time before and after going out on a track or driving the car hard.

 

Martin- Very good question on accuracy in torquing. Ferrari uses a system where torque accuracies are denoted by a letter system. Torque Specification "A" requires + or - 5%, "B" is 10% and "C" is 20%. On each table of torques in later WSMs (the one I looked at was the 612), there is a letter next to the torque specification. Wheel stud bolts are a "B", so on the 612, 100 Nm is recommended, and that would be 90-110 Nm, or (0.738 ftlbs per Nm) 66.4-81.2 ftlbs.

Taz
Terry Phillips

 

Almost right. The torque is indeed to stretch the bolt and put load on it, not to keep it from backing out but rather to prevent the fastener from failing due to fatigue.

 

Yes. You've been very lucky. Buy a torque wrench before it runs out...

 

Guys, I will add that it is very important to have your torque wrench tested and calibrated periodically. The interval depends on the amount of use and care. I have mine done every few years, due to the low use. I know some shops that actually own the electronic testing machine and test and record their results every month! Amazingly, that is was all Costco Tire centers do.

 

Hi,

Nope, thankfully never had such an occurence. I'm speaking more of being able to feel the stretch of the bolt, feel the effects of surface corrosion on bolt and threads of the part, type of thread lubrication (if any), age and condition of bolt (bolts can stretch) and threads - that sort of thing.