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Lug nut torque pranoia #4528638
09/28/17 05:38 PM
09/28/17 05:38 PM
Joined: Jul 2017
Posts: 144
Canada
mcwilly Offline OP
mcwilly  Offline OP

Joined: Jul 2017
Posts: 144
Canada
I'm probably overthinking things as usual. I did some work on my beater car this week (2001 toyota echo) then rotated the tires and when I reinstalled them I had a chance to try out my brand new torque wrench. I previously used a shorter 3/8" torque wrench that had a lot of years of abuse and was way off, I would typically set it to 200lbs/ft and just kept them consistent at least. This new torque wrench is the 1/2" socket and a good 24" long. I trust this one should be accurate, came with the certificate and everything. Setting it tp 70lbs/ft of torque the lugs take a ton of force and a long time to hit that torque. I also noticed that a couple lugs took a few extra turns and are showing more stud threads.

See the top left lug in the pic, showing a good 5 threads whereas the rest are closer to 4. I'd just like to trust the wrench and forget it but it looks off to me. Anyone else experience lugs showing different amounts of threads once torqued to spec? My subaru lugs cover the studs so I've never seen it there.



2010 Subaru Sti 74,000km
2001 Toyota Echo 245,000km
Re: Lug nut torque pranoia [Re: mcwilly] #4528642
09/28/17 05:40 PM
09/28/17 05:40 PM
Joined: Mar 2010
Posts: 1,424
USA
SOHCman Offline
SOHCman  Offline

Joined: Mar 2010
Posts: 1,424
USA
Have any studs been replaced ever?

Did you say you used to torque them to 200 ft lbs with the old torque wrench?


I urge people not to wait 100K to change out the fluid in their transfer case units. -Kestas
Re: Lug nut torque pranoia [Re: SOHCman] #4528648
09/28/17 05:46 PM
09/28/17 05:46 PM
Joined: Feb 2013
Posts: 433
Nevada, USA
gaijinnv Offline
gaijinnv  Offline

Joined: Feb 2013
Posts: 433
Nevada, USA
The correct torque for the lug nuts on your Echo is 76 ft lbs. At least, you should start by trying to hit that torque value.

Torquing those lug nuts to 200 ft lbs on the steel wheels you show in your pic could have damaged the lug bolts, the wheels, or both. A good thing to check to start diagnosing what you are seeing is to remove the wheel and measure the length of all your lug bolts. If they do not all measure the same length, you have a problem.

HTH


USN NAVSECGRU 1970-1974
Re: Lug nut torque pranoia [Re: mcwilly] #4528678
09/28/17 06:05 PM
09/28/17 06:05 PM
Joined: Aug 2017
Posts: 445
Cincinnati, USA
Dave9 Offline
Dave9  Offline

Joined: Aug 2017
Posts: 445
Cincinnati, USA
Agreed, you might have had some studs replaced previously so you should take the wheel off and measure them. However it is pretty near impossible to stretch them that much from overtorque, they would shear off first.

It could even be that a shop broke a stud at some point and didn't tell you, just beat the old one out and beat a new one in. They aren't expensive so a shop might eat the cost and not mention it to save face.

Re: Lug nut torque pranoia [Re: mcwilly] #4528700
09/28/17 06:25 PM
09/28/17 06:25 PM
Joined: Jul 2009
Posts: 876
texas
danez_yoda Offline
danez_yoda  Offline

Joined: Jul 2009
Posts: 876
texas
Ill bet that 3/8wrench was 200 in-lbs not ft-lbs. thats only 16ft-lbs so probably loose before. Torque them to 70ft-lbs and they will get another turn or so.

Re: Lug nut torque pranoia [Re: mcwilly] #4528709
09/28/17 06:42 PM
09/28/17 06:42 PM
Joined: Jun 2003
Posts: 34,223
ME
eljefino Offline
eljefino  Offline

Joined: Jun 2003
Posts: 34,223
ME
Your steel wheels have spring to them and compress around the lug area. If you look at the backside the mating area excludes the holes. So you could have stretched/stressed the wheel which looks like an extra thread on your lugnut.

How much do you weigh? If you're 140, stand on the wrench 6 inches out from the lug, then move your foot an inch to the right and you should hear/feel the click. If you think this is bad for your torque wrench use a 4-way iron and do the same thing but for breakaway torque in a ccw direction.

Re: Lug nut torque pranoia [Re: danez_yoda] #4528713
09/28/17 06:51 PM
09/28/17 06:51 PM
Joined: Jul 2017
Posts: 144
Canada
mcwilly Offline OP
mcwilly  Offline OP

Joined: Jul 2017
Posts: 144
Canada
Originally Posted By: danez_yoda
Ill bet that 3/8wrench was 200 in-lbs not ft-lbs. thats only 16ft-lbs so probably loose before. Torque them to 70ft-lbs and they will get another turn or so.


Yes thats wht I am thinking, because 70 on this wrench feels about 2-3 times tighter than "200" on my other wrench. So I definately wasn't over tightening them before. I feel like I am now though...


2010 Subaru Sti 74,000km
2001 Toyota Echo 245,000km
Re: Lug nut torque pranoia [Re: eljefino] #4528716
09/28/17 06:57 PM
09/28/17 06:57 PM
Joined: Jul 2017
Posts: 144
Canada
mcwilly Offline OP
mcwilly  Offline OP

Joined: Jul 2017
Posts: 144
Canada
Originally Posted By: eljefino

How much do you weigh? If you're 140, stand on the wrench 6 inches out from the lug, then move your foot an inch to the right and you should hear/feel the click. If you think this is bad for your torque wrench use a 4-way iron and do the same thing but for breakaway torque in a ccw direction.


I weigh 205, I feel like im leaning into the tip of the wrench pretty decently at 70lbs.

My axle nut is specced for something like 217lbs and I couldn't get the torque wrench to click. So maybe my brand new torque wrench is off?


2010 Subaru Sti 74,000km
2001 Toyota Echo 245,000km
Re: Lug nut torque pranoia [Re: mcwilly] #4528723
09/28/17 07:08 PM
09/28/17 07:08 PM
Joined: Sep 2009
Posts: 16,546
OH
fdcg27 Offline
fdcg27  Offline

Joined: Sep 2009
Posts: 16,546
OH
With steelies?
I never bother with a torque wrench.
Just put them on tight with a four-way and check them a couple of days later.
85 ft/lbs would be a typical recommendation for lug torque.
Axle nuts?
Just get them as tight as you can.
These are huge nuts on huge axle ends and will take much more than you can give them without damage.
Lug bolts on something German?
Here you need to exercise a little more care, but you don't have such a car.


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96 Accord LX 104K T5 10W-30
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Re: Lug nut torque pranoia [Re: mcwilly] #4528734
09/28/17 07:19 PM
09/28/17 07:19 PM
Joined: Jun 2012
Posts: 717
Reno, NV
redbone3 Offline
redbone3  Offline

Joined: Jun 2012
Posts: 717
Reno, NV
[quote=mcwilly]I'm probably overthinking things as usual. I did some work on my beater car this week (2001 toyota echo) then rotated the tires and when I reinstalled them I had a chance to try out my brand new torque wrench. I previously used a shorter 3/8" torque wrench that had a lot of years of abuse and was way off, I would typically set it to 200lbs/ft and just kept them consistent at least. This new torque wrench is the 1/2" socket and a good 24" long. I trust this one should be accurate, came with the certificate and everything. Setting it tp 70lbs/ft of torque the lugs take a ton of force and a long time to hit that torque. I also noticed that a couple lugs took a few extra turns and are showing more stud threads.


I have never seen a 3/8" torque wrench that goes as high as 200 ft lbs. I would trust the new wrench if it hasn't been abused. Be sure to set it to 20% of full scale (or less) when storing it.


2014 Passat Wolfsburg, 1995 Miata.
Re: Lug nut torque pranoia [Re: mcwilly] #4528811
09/28/17 08:16 PM
09/28/17 08:16 PM
Joined: Jan 2009
Posts: 6,885
New England
gathermewool Online content
gathermewool  Online Content

Joined: Jan 2009
Posts: 6,885
New England
No such thing as ft/lb or lbs/ft in this context.

feet of leverage times pounds of force = torque.

Applying 50 lbf to a 2' bar = 100ft-lbs of torque


'14 Forester XT FA20DIT (Cobb Stage 1)
Edge 0W-40 + FU filter (64,774 miles)
'15 Legacy FB25 (OEM Stage, uh, neg. 7?)
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Re: Lug nut torque pranoia [Re: mcwilly] #4528842
09/28/17 08:44 PM
09/28/17 08:44 PM
Joined: Jul 2017
Posts: 144
Canada
mcwilly Offline OP
mcwilly  Offline OP

Joined: Jul 2017
Posts: 144
Canada
That makes sense, so I probably am overtorqued right now. Probably at 140lbs eek better get on that.


2010 Subaru Sti 74,000km
2001 Toyota Echo 245,000km
Re: Lug nut torque pranoia [Re: mcwilly] #4528900
09/28/17 10:00 PM
09/28/17 10:00 PM
Joined: Oct 2011
Posts: 3,033
Chicago, IL
Brybo86 Offline
Brybo86  Offline

Joined: Oct 2011
Posts: 3,033
Chicago, IL
But are you fully torqued?


08 Honda Accord EX-L 2.4L M1 EP 0w20 153k
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