Lug nut torque investigation?

[burdickjp]

I was scratching my head about how high the lug nut torque is after 5 of my wheel studs sheared off last time I pulled my wheels.
Even more curious to me is that the current Impreza, which has very similar running gear, is apparently 92 N*m (according to a quick internet search) compared to the 120 N*m the BRZ calls for. Anyone look into this?

[vroom4]

Are you confusing N-m and ft-lb? 90 ft-lb = 120 N-m....basically every lug nut Ive ever tightened has been to this spec and I have never broken a stud.


Ive had the wheels on and off my brz at least 300 times....still on stock studs.

[burdickjp]

Originally Posted by vroom4

Are you confusing N-m and ft-lb? 90 ft-lb = 120 N-m....basically every lug nut Ive ever tightened has been to this spec and I have never broken a stud.


Ive had the wheels on and off my brz at least 300 times....still on stock studs.

I don't work in archaic units.

I had some tires installed in January. I'm guessing the wheels were installed with an impact.

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[jawn]

Originally Posted by bur****jp

I had some tires installed in January. I'm guessing the wheels were installed with an impact.

Yeah, this is probably more than likely. I've only had one good tire shop experience in my entire life.

[Vracer111]

Originally Posted by bur****jp

I don't work in archaic units.

I had some tires installed in January. I'm guessing the wheels were installed with an impact.

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I only let tire places mount the tires to the wheels... will never let them put the wheels on the car, I do that myself PROPERLY by hand and then torque down to 81ftlb! Too many issues with tire places in the past...

[burdickjp]

This was a Toyota dealership.

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[vroom4]

Originally Posted by bur****jp

I was scratching my head about how high the lug nut torque is after 5 of my wheel studs sheared off last time I pulled my wheels.
Even more curious to me is that the current Impreza, which has very similar running gear, is apparently 92 N*m (according to a quick internet search) compared to the 120 N*m the BRZ calls for. Anyone look into this?

Originally Posted by bur****jp

I don't work in archaic units.

I had some tires installed in January. I'm guessing the wheels were installed with an impact.

Sent from my XT1045 using Tapatalk

Wheels were installed with impact, you work in NO UNITS apparently

End thread. There is nothing wrong with OEM studs, just users.

[Rabbit of Caerbonnog]

[JazzleSAURUS]

May as well get some cool studs like ARP's, and use a torque wrench, while not letting dopes near your car. That solves most of the problems.

[burdickjp]

Originally Posted by vroom4

Wheels were installed with impact, you work in NO UNITS apparently

I wasn't the last person to touch them, and I'm sure that was the problem, but in my investigating I found a difference and am wondering why it is.
Why not be a little nicer?

Originally Posted by JazzleSAURUS

May as well get some cool studs like ARP's, and use a torque wrench, while not letting dopes near your car. That solves most of the problems.

Yep, got ARPs on the front now to accommodate spacers to accommodate my new front calipers.

[srizzors25]

It's possible they could have been weakened by improper install (install with impact) and just so happened that they reached their breaking point at the most recent install even under proper torque.

Be careful with your other lugs in the future. If you sheared 5 off, chances are a good amount of your studs are probably on the edge as well.

[vroom4]

Originally Posted by bur****jp

I wasn't the last person to touch them, and I'm sure that was the problem, but in my investigating I found a difference and am wondering why it is.
Why not be a little nicer?



Yep, got ARPs on the front now to accommodate spacers to accommodate my new front calipers.

Sorry typing from phone, try to keep it short. Disregard "meanness"

[stugray]

Originally Posted by bur****jp

I don't work in archaic units.

That's a sure fire attitude to get your car messed up.

How many mechanics in the US do you think can convert to/from metric in their heads.
Learn to speak the language of the natives and you will get much accomplished.
It is sad that the US still uses "archaic units" but denying that fact is not prudent.

[burdickjp]

Originally Posted by srizzors25

It's possible they could have been weakened by improper install (install with impact) and just so happened that they reached their breaking point at the most recent install even under proper torque.

Be careful with your other lugs in the future. If you sheared 5 off, chances are a good amount of your studs are probably on the edge as well.

I replaced the fronts with ARPs and the backs with the studs which came with my Eibach spacers. They were shorter, so I could install them without pulling the rear hubs. I wasn't in a position to make an adapter for my slide hammer to pull the rear hubs out, so it was a good thing that these spacers came with studs!

Originally Posted by vroom4

Sorry typing from phone, try to keep it short. Disregard "meanness"

I genuinely appreciate the apology.

But really. Does anyone have any ideas as to why the BRZ would have different torque specs to other Subarus, when it shares parts, or did I just find the wrong info for other Subarus?