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911 Turbo Anti Roll Bar


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I've just acquired a Turbo ARB as part of a suspension overhaul and upgrade to replace my standard 22mm ARB.

One slight snag the "Legs" of the bar are slightly out of true; when sitting on a flat surface, one leg being 4/5mm off the surface.

I cant decide if this is a problem or not....

If it was a race machine corner weighted to within a kilo, obviously its a problem, but for swift road use, I'm not so sure.

Any thoughts welcome...

 

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Front or rear? If it's rear the 4/5mm could be dialled out using adjustable drop links. If it's front it would be a no from me. However, being steel, I'm sure the right person could twist it straight again? Or, I think later G50 3.2s had a 22mm front ARB* should should be easy to source a new(er) one. 

*can't actually find that info but I have seen it here somewhere. Silver WT or others will confirm.

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Thanks for the comments Chris. It is a front ARB, so no adjustment or drop links involved.

Its a 25mm bar, so correcting could take some really long scaffolding poles... 

May just be easier to bounce it back to the supplier.

AT

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My apologies I read it WAS a 22mm not REPLACED a 22mm..... I wouldn't use a bent one, you will never get geometry spot on.

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1 hour ago, saab4249 said:

Its a 25mm bar, so correcting could take some really long scaffolding poles... 

Are you sure it is 25mm and for an IB?

Have you compared it side by side with a known IB one? Or, is it a through the body version?

AFAIK there was never a standard front ARB above 22mm (Turbo or other), see PET extract (PET up to '89 only lists one 22mm for all) ...

858843053_arb.jpg.c51e6a32935241c4b9d521806b337ea0.jpg

Also, AFAIK, only larger diameter "through the body" type front ARBs  were/are available from after market suppliers.

But, yes you can fix it by bending it back if it's just a bit out. However, I would not do anything until you are 100% sure it is for an IB.

2 hours ago, Chris T said:

*can't actually find that info but I have seen it here somewhere. Silver WT or others will confirm.

You mean this?

  Front TB Rear TB Rear TB Splines Front ARB Rear ARB Rear ARB Shape
>'77 18.8mm 23.0mm 40/44 16/20 mm ? Early shape
SC 18.8mm 24.1mm 40/44 20.0mm 18.0mm Straight
Carrera 84-85 18.8mm 24.1mm 40/44 20.0mm 18.0mm Straight
Carrera 86 18.8mm 25.0mm 40/44 22.0mm 21.0mm Straight
Carrera 86-89 (G50) 18.8mm 25.0mm 46/47 22.0mm 21.0mm Offset
Turbo 84 18.8mm 26.0mm 40/44 22.0mm 18.0mm Large offset
Turbo 85-89 18.8mm 26.0mm 40/44 22.0mm 20.0mm Large offset
Turbo 89- 18.8mm 27.0mm 46/47 22.0mm 18.0mm Large offset

 

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1 hour ago, SilverWT said:

Are you sure it is 25mm and for an IB?

Have you compared it side by side with a known IB one? Or, is it a through the body version?

AFAIK there was never a standard front ARB above 22mm (Turbo or other), see PET extract (PET up to '89 only lists one 22mm for all) ...

858843053_arb.jpg.c51e6a32935241c4b9d521806b337ea0.jpg

Also, AFAIK, only larger diameter "through the body" type front ARBs  were/are available from after market suppliers.

But, yes you can fix it by bending it back if it's just a bit out. However, I would not do anything until you are 100% sure it is for an IB.

You mean this?

  Front TB Rear TB Rear TB Splines Front ARB Rear ARB Rear ARB Shape
>'77 18.8mm 23.0mm 40/44 16/20 mm ? Early shape
SC 18.8mm 24.1mm 40/44 20.0mm 18.0mm Straight
Carrera 84-85 18.8mm 24.1mm 40/44 20.0mm 18.0mm Straight
Carrera 86 18.8mm 25.0mm 40/44 22.0mm 21.0mm Straight
Carrera 86-89 (G50) 18.8mm 25.0mm 46/47 22.0mm 21.0mm Offset
Turbo 84 18.8mm 26.0mm 40/44 22.0mm 18.0mm Large offset
Turbo 85-89 18.8mm 26.0mm 40/44 22.0mm 20.0mm Large offset
Turbo 89- 18.8mm 27.0mm 46/47 22.0mm 18.0mm Large offset

 

Thanks for the PET extract on ARB dimensions, good info.  Its certainly is an IB item, profile is a mirror of my standard ARB. Must be aftermarket in that case.

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3 hours ago, Ian Comerford said:

Unless you can straighten it and be sure that it will function consistently across its length I wouldn’t use it.

I'm leaning to your way of thinking also Ian.

Best pack it up and ship it back..

42 minutes ago, mean in green said:

If you decide not to use it roll bars are actually still available new from Porsche (around £150 last time it came up). 

Cheers Simon, that's seems good value form OPC, will check it out.

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