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#4528638 - 09/28/17 05:38 PM Lug nut torque pranoia
mcwilly Offline


Registered: 07/31/17
Posts: 94
Loc: 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.

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2010 Subaru Sti 71,000km
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#4528642 - 09/28/17 05:40 PM Re: Lug nut torque pranoia [Re: mcwilly]
SOHCman Offline


Registered: 03/29/10
Posts: 1283
Loc: USA
Have any studs been replaced ever?

Did you say you used to torque them to 200 ft lbs with the old torque wrench?
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#4528648 - 09/28/17 05:46 PM Re: Lug nut torque pranoia [Re: SOHCman]
gaijinnv Offline


Registered: 02/14/13
Posts: 414
Loc: 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
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#4528678 - 09/28/17 06:05 PM Re: Lug nut torque pranoia [Re: mcwilly]
Dave9 Offline


Registered: 08/28/17
Posts: 147
Loc: 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.

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#4528700 - 09/28/17 06:25 PM Re: Lug nut torque pranoia [Re: mcwilly]
danez_yoda Offline


Registered: 07/18/09
Posts: 409
Loc: 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.

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#4528709 - 09/28/17 06:42 PM Re: Lug nut torque pranoia [Re: mcwilly]
eljefino Offline


Registered: 06/15/03
Posts: 32389
Loc: 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.

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#4528713 - 09/28/17 06:51 PM Re: Lug nut torque pranoia [Re: danez_yoda]
mcwilly Offline


Registered: 07/31/17
Posts: 94
Loc: 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...
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2010 Subaru Sti 71,000km
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#4528716 - 09/28/17 06:57 PM Re: Lug nut torque pranoia [Re: eljefino]
mcwilly Offline


Registered: 07/31/17
Posts: 94
Loc: 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?
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#4528723 - 09/28/17 07:08 PM Re: Lug nut torque pranoia [Re: mcwilly]
fdcg27 Offline


Registered: 09/25/09
Posts: 15444
Loc: 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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#4528734 - 09/28/17 07:19 PM Re: Lug nut torque pranoia [Re: mcwilly]
redbone3 Offline


Registered: 06/09/12
Posts: 645
Loc: 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.
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#4528811 - 09/28/17 08:16 PM Re: Lug nut torque pranoia [Re: mcwilly]
gathermewool Offline


Registered: 01/09/09
Posts: 5892
Loc: 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
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#4528842 - 09/28/17 08:44 PM Re: Lug nut torque pranoia [Re: mcwilly]
mcwilly Offline


Registered: 07/31/17
Posts: 94
Loc: Canada
That makes sense, so I probably am overtorqued right now. Probably at 140lbs eek better get on that.
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2010 Subaru Sti 71,000km
2001 Toyota Echo 232,000km

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#4528900 - 09/28/17 10:00 PM Re: Lug nut torque pranoia [Re: mcwilly]
Brybo86 Offline


Registered: 10/08/11
Posts: 2912
Loc: Chicago, IL
But are you fully torqued?
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