Heli coil wheel studs ??

[fastfredracing]

When I converted my 914 to 5 lugs, I had a local machine shop redrill and tap my rotors, and rear hubs .
I used extended racing steel studs, in 911 thread pitch and size 14x1.5.
When I first put them on , one stud started to pull from the front rotor. I did a quick thread chase at that time, red locktited it and sent it . I have periodically checked it over the last few years ,and has never came loose
Just tonight, I mounted up some new rubber for it and fudge me , 3 studs pulled from the front rotors, at 90 ft pounds .
These were brand new rotors, I probably have 2000 miles on them, and I waited for months for the machine shop to do the job for me too . Im not going through that mess again .
PMB was not selling individual rotors at the time , you could only get them if you bought their kit . Not sure if that still holds , maybe Ill call them Monday
Ill just heli coil all 5 on each front rotor, I hope to someday have some big fat slicks on this and thrash it around some cones again .
I feel pretty comfortable with a heli coil here, what do you guys think ?

[herr_oberst]

What choice do you have? And, because of the increased diameter they may be stronger than the hub threads. Red loctite for sure.

[908/930]

I would use a recoil or key lock type insert vs a coil type, more of a threaded drum that gets locked in. I find heli-coil don't do as well with the bolt/stud being removed many times. How thick is the material cross section?

[Zeke]

Do they make time certs for your application?

[aschen]

As long as drilling for the upsized tap doest get too close to an edge the helicoil will be stronger than the original hole. Question is why are they pulling out though. Brake rotor material is pretty low strength but if you have 1 diameters worth of thread length you should have been fine. 1.5ish ideally. Are the female threads failing or just loosening? If the latter, may go full red loctite into the rotor. If they are failing probably deserves more careful consideration