Torque wrench necessary for putting on wheels? - Page 5 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

cjny · 11-21-2016, 07:16 PM

As it happens, I just put my brand new aluminum wheels on the car last Saturday. Each lug was torqued with a Snap-On torque wrench, which I trust (because it was so expensive

). I left the wrench set to 89 Ft-lb. After driving about 70 miles I checked each lug. Out of 20 lugs, only 14 were still at spec. Six lugs needed a noticeable (but unmeasured) bit of re-torquing.

Ultramaroon · 11-21-2016, 07:33 PM

Quote:

Originally Posted by justatroll

And I have a torque wrench that is JUST for my wheels. It is set at 92 lbs

That's bad for the wrench. Breakaway torque wrenches need to be stored unloaded.

But you're an EE so you get a pass.

humfrz · 11-21-2016, 09:24 PM

Quote:

Originally Posted by justatroll

"new fangled alloy wheel" Like the ones in my avatar on my vintage race car?

Welp, grasshopper, I reckon that depends on where you started from......

humfrz

Yardjass · 11-22-2016, 11:55 AM

Quote:

Originally Posted by Ultramaroon

That's bad for the wrench. Breakaway torque wrenches need to be stored unloaded.

But you're an EE so you get a pass.

Yeah, if this is the case, that torque wrench definitely needs a calibration check at least.

justatroll · 11-27-2016, 01:52 PM

Quote:

Originally Posted by Ultramaroon

That's bad for the wrench. Breakaway torque wrenches need to be stored unloaded.

But you're an EE so you get a pass.

Quote:

Originally Posted by Yardjass

Yeah, if this is the case, that torque wrench definitely needs a calibration check at least.

Ok, just for fun I went out to the garage.

I took out my wheel torque wrench that is left at 92 ft-lbs (pretty much all the time).
I also took out my "good" torque wrench that is stored unloaded.

I turned DOWN the 92 ft-lbs to 70 ft-lbs.
I set my unloaded "good" TR to 70 ft-lbs

I then conencted them together and "calibrated".
Guess what?
They BOTH click at precisely the same setting even after going up & down a few pounds.

So you guys might be right!
My "loaded" torque wrench could be off maybe more than 0.1 ft-lbs!!!
Oh No! My wheels are going to fall off!

BTW - I am torque wrench certified by Lockheed Martin & NASA for use on flight hardware, so I have almost as much knowledge about the subject as your average internet desk-jockey expert.

I know that storing a TR loaded will cause an error over time, but the magnitude of the error is insignificant for a wheel lug bolt.

Ultramaroon · 11-27-2016, 01:59 PM

Your good wrench is out of cal.

#totaled

11-27-2016, 01:59 PM	#62
Ultramaroon not playing cards Join Date: Sep 2014 Drives: a 13 e8h frs Location: vantucky, wa Posts: 32,392 Thanks: 53,053 Thanked 37,228 Times in 19,308 Posts Mentioned: 1118 Post(s)	Your good wrench is out of cal. #totaled __________________ service manuals

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11-21-2016, 07:16 PM	#57
cjny Member Join Date: Jul 2016 Drives: 2016 BRZ Location: Upstate NY Posts: 69 Thanks: 18 Thanked 25 Times in 18 Posts Mentioned: 2 Post(s)	As it happens, I just put my brand new aluminum wheels on the car last Saturday. Each lug was torqued with a Snap-On torque wrench, which I trust (because it was so expensive ). I left the wrench set to 89 Ft-lb. After driving about 70 miles I checked each lug. Out of 20 lugs, only 14 were still at spec. Six lugs needed a noticeable (but unmeasured) bit of re-torquing.

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