The Porsche 928 wheel lugs are common on several Porsche models. They are M14x1.5 in size. SW19 Part number 999 182 003 36. Torque 210 Nm.
Doesn't get more basic than this.
As part of his on-going studies in applied engineering, I asked "the boy" to look up the torque for the lug nuts and then double check the tightness. He looked through the little book but couldn't find it. I took a look and couldn't find the "right" number either. It says 130Nm or 95 ft lbs! The manual agrees.
I always thought that it should be around 40 ft lbs and have been driving it that way. And doing DE at over 130mph! The aluminum lugs don't seem up to 130Nm.
I use 94 ft/lb (127 Nm). If you are not comfortable with that (although I've used the factory aluminum nuts for over 10,000 miles of track driving, without a problem) you can buy "open" steel nuts from the pure race guys, and substitute them (as required for club racing.) Kim
They're really GOOD aluminum lugnuts!
95 lb/ft is the generally accepted figure.
Just be sure that you get the socket all the way to the bottom of the nut when you start to take them off.
Thanks, Kim and all who responded.
The Boy reports that 95 ft lbs is not much more than where they were.
I've been planning to get the steel lug nuts. Just slip them in on one of my supply shipments. $^)
Agreed! Really GOOD alloy lug nuts! I really should not drink beer while
wrenching my car or I'm getting dyslexic as i get older. I have been
tightening those alloy lug nuts to 130 Ft/lbs not 130 N/m. The funny thing is i never really gave it much though even though i know the lug nut torque spec is 95lb/ft for my wife's Volvo wagon.
with real TIGHT lugnuts.
One more thing. If you ever use a thicker wheel or put a spacer between the wheel and the hub, the lugnuts need to make at least 7 full turns before seating. Also, if you put in longer studs, the closed lugnuts can only be turned about 12 times before they bottom-out (BTDT). YMMV.
~ Merry motoring ~
> They're really GOOD aluminum lug nuts! 95 lb/ft is the generally accepted figure.<
isn't the effect of the applied 95 ft/lbs torque strongly dependent on if and where anti seize is applied (as I was advised by JK some while back). I've settled on 95 with anti seize on the threads, but nothing on the wheel where it contacts the nut face.
The wheel studs are 14mm with 1.5mm pitch.