PogueMoHone

^
Your observations are valid.... but not everyone has the physical capabilities you have.... and that is no slight.

You may be over simplifying the physical requirements, or just not conscious that others have different physical limitations.

What is easy for you is not necessarily easy for others, I think I am in the five slug camp.

mdrums

Why Why Why? Porsche Why?!?!?!?!

mooty

someone will come out with five lugs.
the CL is a fk'g disaster.
or maybe we convert to cup car center lock.....

CGT, 40min chg wheels, you would miss your session if you had to do that then get into race suit, hook up cool suit, fill box with ice etc. it takes me 15 min to change all wheels and that's too long... i need air jacks.

malmasri

Incremental progress....next GT3 RS must have a center wheel lock DELETE option

savyboy

How does the torque multiplier affect the turning force fed into the axle (parking brake/transmission) vs the 4 foot long gut-busting torque wrench method?

Now, where is the rope...

Carrera GT

Physical capabilities? Why always bring every thread down to sexual prowess?! I know I'm Porsche's answer to Austin Powers ... oh ... you mean lifting the wheel on the hub ... right ... well, there are ways to make that a back-breaking-less task, but the real challenge is a: making sure the jack is on the jacking point (why can't we go back to having a square peg go in the side of the car, please?) and 2: jacking each tire up just a hair off the ground so that sliding the replacement into place is definitely at the right height ... the center-lock hub guides the wheel with no fuss and there's many alignment points for the conic studs, so a few degrees in either direction and it finds its way. The only muscle work is the now monstrous 660 nm ... with the torque multiplier at 6:1, that's a trivial 110nm at the handle ... the five slugs are 130nm.

At the end of the day, you're right, some will not have a trailer full of stuff and I've had some practice. For the true spirit of the 911 -- to drive to the track, win the race and drive home -- the centerlock adds yet another question of "sure this is better but is it an improvement?" with each new 911 "feature."

By the way, there is a tool that depresses the brake pedal for wheel alignment tasks -- it's a sort of ratchet expanding rod that braces against the seat or steering wheel and forces the brake pedal down ... I'm guess this will be the next gadget I'll need to remember to brinng to the track from now on.

Carrera GT

pre-script: Thanks for providing this information ... you once again earn your title!

There is exactly the same torque applied to the nut, so the wheel will rotate. But, if the torque reaction arm of the multiplier is secured by the spokes of the wheels (as with the Carrera GT) then all forces negate. Thus natures balances itself.

PogueMoHone

There goes that upside down thinking again!

PogueMoHone

^
My thinking is I am just going to park next to you, and act helpless!

Carrera GT

http://www.etoolcart.com/brakepedald...rlis21520.aspx

LehmanZ06

Question...

Why would you have to have the car in the air to torque the wheels, provided that you had somebody or a large dumbbell, or that steering wheel brake thingie ?

Can't you torque the wheels with the brakes on while the car is on the ground ?

Will torqueing the wheels to 444 ft lbs.....could it possibly damage the ceter lock ?

So 349 ft lbs is ok for the street and not the track ? (how about autocross...where speeds are below 85mph and generally much slower.

What if I don't use grease ? Will the wheels fall apart ?

I bet they had a situation where the wheels weren't properly torqued in a race type setting and they came off.

So 444 for the track, but at 349 for street...it's ok if the wheels come off the car ? WTF ?

DD GT3 RD

Agreed

LehmanZ06

What about "turning the locking thingie with a square extension....left and right.....what square extension ? Could someone help explain....thanks....

David

masmole

Nice find!

I was thinking about making or acquiring a device like this. If you get one, please do let us know how well it works out... that is, if torquing, swapping, and breaking centerlock wheels can truly be a somewhat painless one-man job with the new torque specs required for track use.

LehmanZ06

Another thought.......was this "faliure" (guess on my part)....with a OEM wheel or aftermarket. Or would it matter.