07-28-2016, 09:32 AM
Join Date: Oct 2013
Location: NorthWest NJ
Total Cats: 29
Self loosening lug nuts?
Not directly miata related, but not sure where would be a better spot for this?
Cars, 2011 Honda Fit with Kosie K4R wheels and the included closed top conical seat lug nuts from Tire Rack, 2003 Pontiac Montana with stock alloy wheels and original GM lug nuts.
On my Fit, any time I put the K4Rs on and torque the lug nuts, they need to be retorqued after 2 miles (usually all are loose), then again after 5 more (usually 1-2 loose on each wheel) Then for the next few drives after every drive (usually 2-3 loose on whole car), then check them every other day for the next week (usually below torque, but none actually loose). After that, they are generally good. Though I check them about once a month, occationally finding 1-2 loose. This is torqueing them to 95ftlbs in a star pattern.
I make sure they are sitting flat when I put them on, tighten in a star pattern with a drill while in the air, then with a 1/2" drive socket wrench before putting the car down and torquing it.
I usually torque alloy wheels to 80-85ftlbs. This has prooven fine on my other cars, including the Miata while doing track and autocross. Steel wheels I will do to 95ftlbs.
The Montana gets 110ftlbs per the instructions, needs a retorque after 5 miles, then usually again after the next drive, and then again a few days later. My dad usually drives the lug nuts on with the impact set way low (usually ends up around 50-60ftlbs) before putting the car down and torquing them.
These same cars get steel wheels in the winter with no problems with the lug nuts coming loose. None of the other cars in our fleet have ever exhibited this behavior.
The torque wrenches have been checked against each other and a beam type and all read the same.
What is going on that causes this?