centrelocks

[fioran0]

finally getting round to making some posts...
with all the unending centrelock excitement i figured id post some pics of how the Cups centrelock setup works.

the regular hub nut is changed to one with a threaded extension to it and the whole piece just screws to the hub in place of the regular nut (ie to the ABS wheel at the front and the drive shafts on the rear). the hub itself is machined and accepts 5 metal pins to prevent wheel rotation under load.



a metal spacer is then slid onto the hub nut/stub axle to help centre the wheel. its hex shaped in the middle so fits snuggly over the nut. once on you just leave it there unless stripping the hub down to replace a bearing or clean.



this is it all together with the wheel pulled off.



to put the wheel on, you just lift it onto the hub, put the big washer on and tighten the nut. removal is the same but reversed. you can use a rattle gun for both.

[J-P]

Thanks - is the only reason to hate them on road cars that you can't easily change the tyres?

[arcamalpha]

Very interesting, thanks.

So why not use the same system on the road cars? It looks like they did on the Carrera GT.

Also, are the wheels the same in terms of fitment? i.e. could you fit a cup wheel to a road car with centre lock hubs?

[Olivera]

J-P said:

Thanks - is the only reason to hate them on road cars that you can't easily change the tyres?

Regarding the roadgoing versions, I'd probably say:

1) You can't change the tyres easily
2) The centre lock hub/parts need included in the service schedule (see recent recall)
3) They are more prone to sudden failure
4) There are less aftermarket wheels to choose from
5) They are totally pointless on a road car, with all of the above drawbacks

[Carl_Docklands]

First thing I do is call Porsche assist anyway so I don't care if one pops, what's good about the cup wheels over the road centre locks?

[fioran0]

i wasnt making any pronouncements and im not interested in a whats better thread.
i was at my car over the weekend, the sun came out so i figured id pull some parts off and take pictures to post up since most people on here have never seen a cup system.
theres always a bunch of opinions on both the race and street systems but never any more than that. this was a balance redress. some actual info and pictures rather than an opinion.

the wheels arent interchangeable, totally different fitments and mounting systems.
theres also a lot of BS around relating to the maintenance for the Cup system. only the wheel bearings are subject to routine replacement and this is purely down to heat and track use. every car driven on track will see the same. the hub and wheel mounting parts have no replacement requirements unless you damage something.

Edited by fioran0 on Thursday 21st February 22:45

[fioran0]

heres the parts for the street system and then a hub up close.

Edited by fioran0 on Friday 22 February 01:47

[ttdan]

What torque does the windy gun put on them?

[fioran0]

hub nut is 470Nm, the wheel nut then goes on at 460Nm.
you cannot use a rattle gun on the street parts, the impact isnt good for them.