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07-14-2021, 01:27 PM | #1 |
Scooby Newbie
Member#: 219009
Join Date: Jul 2009
Chapter/Region:
Tri-State
Location: NJ
Vehicle:2018 LBP WRX Ltd. 2005 PSM WRX - St.2 (rip) |
Any lasting effects from overtorqued lug nuts?
Let’s say hypothetically you’ve rotated your tires several times. For years, you didn’t follow the specs in your manual..Either the shop or you previously overtorqued your lugnuts every time. And when I say overtorqued, I mean like full body weight right. You find out recently that torque specs on lugnuts are 89 in/lb so you retorque your wheels.
Because you’ve repeatedly overtorqued your lugs coupled with more than dbl torque specs, what kind of damage has been done to the threads, if any? If you torque to spec moving forward, would it actually feel like a much lower in/lb due to the repeated wear on the threads? Would it be easier for your lugs to get loose from daily driving or am I overthinking this one? Would it be safer to instead increase the torque to 100 in/lb to offset any potential issues?
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07-14-2021, 10:05 PM | #2 |
Scooby Specialist
Member#: 283429
Join Date: May 2011
Chapter/Region:
South East
Location: Down yonder.
Vehicle:2016 Fuji Sunfire 03 Silver |
eventually you may have a stud/nut seize or cross thread.
You can replace lug studs - hammer them out of the hub flange and then use a special wheel stud installer bearing tool to install new studs. Use new nuts. Subaru dealer lube techs do it all the time because they strip lug nuts like a dog eating cat poo... |
07-15-2021, 03:18 PM | #3 |
Scooby Newbie
Member#: 398304
Join Date: Aug 2014
Chapter/Region:
NESIC
Location: Boston
Vehicle:2002 WRX EJ257 WRB |
Lasting effects, yes. Accelerated wear. Normal life expectancy? Way too long. Failure mode? Thread damage and/or yielding. Should you worry about it? Not really - it won't happen at the same time simultaneously to all the hardware. You have 5 per wheel you only need 3, but you should never rely on less than 4. You will be fine, when you notice damage fix it. Invest in a good torque wrench and get a feel by hand. Torque to spec. Do not increase the torque spec. Try to do a sanity check/calibration on the torque wrench every year.
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07-16-2021, 04:20 PM | #4 |
Scooby Newbie
Member#: 524851
Join Date: Jun 2021
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89 (or even 100) in/lbs isn't very much. Maybe you mean ft/lbs?
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10-16-2021, 08:57 AM | #5 |
Scooby Newbie
Member#: 527007
Join Date: Oct 2021
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Generally the factory torque is more than enough unless you have an ungodly wide wheel and are taking corners really fast
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10-29-2021, 08:19 AM | #6 |
Scooby Newbie
Member#: 370019
Join Date: Oct 2013
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After dealership serviced brakes on wife's car, I changed to winter tire set at home. I measured the lug torque's anywhere from at 120 to 139 ft/lbs! I think manual says 89. How hard is to to use a freaking torque wrench???!
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10-29-2021, 09:49 AM | #7 |
Scooby Specialist
Member#: 239822
Join Date: Mar 2010
Chapter/Region:
South East
Location: America's Penis
Vehicle:2010 WRX pandiculation |
FYI, breakaway torque is always higher than tightening torque.
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10-30-2021, 08:12 AM | #8 |
Scooby Newbie
Member#: 478524
Join Date: Nov 2017
Chapter/Region:
NESIC
Location: Southern NH
Vehicle:1995 EZ30 Coupe Green |
Man I always give it the extra sauce when tightening lug nuts. I've always used a 4-way lug wrench and don't go as hard as I can, but it's more than spec. I'd rather struggle to remove the wheel than have it fly off on the highway, which I've seen in person and is actually scary.
Never had a problem with my lug studs. |
02-13-2023, 11:34 AM | #9 |
Scooby Newbie
Member#: 340993
Join Date: Dec 2012
Location: Winnipeg
Vehicle:2015 WRX STi WRB |
Studs can get stretched and then have an issue with threading the lug nuts on in some cases. Is the potential in extreme cases to have the stud fail as well.
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02-16-2023, 01:07 AM | #10 | |
Scooby Newbie
Member#: 507317
Join Date: Oct 2019
Chapter/Region:
MAIC
Location: SW Ohio
Vehicle:2019 WRX Pure Red |
Quote:
In my mind, doing the final torque tighten in the air, at 89 ft-lb, will result in a higher torque rating when the car is set back on the ground vs tightening to 55-60 ft/lb w/the car in the air and the final tightening when the car is fully sitting on the ground. Is my mind in the right place? I find it easier to loosen the lug nuts when the vehicle is raised slightly, weight taken off of the wheel as now that corner has the jack lifting some of the car, but the tire still has contact w/the ground to provide counter-torque I think there is a different with (final) torque on a wheel nut in the air vs when on the ground. |
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03-28-2023, 09:53 PM | #11 |
Scooby Newbie
Member#: 495692
Join Date: Dec 2018
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Interesting read here for sure!
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09-26-2023, 07:32 AM | #12 |
Scooby Newbie
Member#: 535615
Join Date: Sep 2023
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I've had to drill out a lug when the stud just spun because the shop put it on too tight. It's not fun, but takes some time and patience. I wouldn't be concerned if you can get it off. Lug nuts are cheap and so are studs if your really worried. Put studs in the freezer to shrink them before installing.
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