Pelican Parts Forums - Need a picture of Turbo twist wheels on 911

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- - Need a picture of Turbo twist wheels on 911 (http://forums.pelicanparts.com/porsche-911-technical-forum/336171-need-picture-turbo-twist-wheels-911-a.html)

Quote:

Originally posted by MattAlpha

I have a hub adapter on the rear just like Rarly8's. A bit of warning though, I just got back from a first rate shop (Performance Art) and their Porsche tech (with over 35 years experience) told me that adapter set-up is a safety concern on a driven axel. He told me that you need to go with a plain spacer and longer studs. I just wanted to mention that.

-Matt [/B]

I have to strongly disagree with that. Your wheel needs to be supported by both the hub in the middle and by the wheel studs. By running longer studs and a spacer, you are putting all of the load on your wheel studs hence putting them into classic fatigue (bending back and forth slightly as the wheel rotates). Given the notched profile of the wheel studs and time (miles) they will eventually break. By installing a proper bolt on spacer / adapter, you are supporting the wheel again by the hub on the spacer which is supported bt the hub on your drive hub. This is WAY safer.

Hey - I just took a look at the photos again. RarelyL8's bolt on adapters are not safe - they do not have the hub. See below:

<img src="http://forums.pelicanparts.com/uploads10/S15Adapter1174182482.jpg" border="0" alt=""> <br />

84Euro's however, are safe because they have the hub on the spacer - see below:

<img src="http://forums.pelicanparts.com/uploads10/Porche+84Euro+0021174185234.jpg" border="0" alt=""> <br />

unclebilly,

I had the same feeling as you about the spacer. Less stress on bolts, as long as both the spacer and the wheel lugs are torqued to the same spec. I was told yesterday while I was having my car looked at for an alignment that this set-up is unsafe, and that the hub bolts should go through the spacers and hold the wheel on with the lug nuts only.

Physically that set-up would involve more stress on those much longer bolts.

But that is what I was told it should be the set-up (the longer bolts).

Here is a picture of my adapters (that I'm currently running) before I did my brake and suspension work.
http://forums.pelicanparts.com/uploa...1174766653.jpg

-Matt

What you have there is the same as i'm running and is safe provided that the hub is making contact with the wheel (and it is judging by the markings on the hub).

Doing it the otherway is totally not cool. The studs are put in classic fatigue loading.

Think about how you break a chunk of steel - you bend it back and forth repeatedly. Think about the loading on your wheel studs as the wheels rotate, it's the same thing. It's just a matter of time before you reach the endurance limit of the stud.

With the hub to locate the wheel, the load on the studs is purely tensile and is not cyclic (unless you count cornering). This is why the factory put that hub there and why is needs to be on your spacers. The hub takes the verticle load, the studs just hold the wheel on.

here's my 74( all done up like a 993). Dig my ricer mirrors

http://forums.pelicanparts.com/uploa...1174786347.jpg