Uprated wishbones

[Tony Hunter]

I replaced the ball joints over this winter as a refresh package, the old ones weren't too bad, but the wishbones are still the same as when built.

 

[_WILL_]

Slicks, big brakes, modified kinimatics, proper suspension etc.

I don't see what advantages these wishbones offer over a set of standard items with polybushes and camber bolts.

As in the wishbones? Is it all spherical bearings / rose joints or do you still have bushes in there somewhere.

I guess the only advantage is the possibility of a bit more castor, and maybe the smallest amount of extra track width, but it would be negligible.

I don't think I would run these over the setup you have suggested either, but I get frustrated when people say something looks s**t without giving a reasonable of justifiable reason. I think looking at it he wishbones would be fine. The ARB mount would be s**t and the OBJ or lack of it may be an issue if the build quality tolerances were s**t. But as you have said I don't think there is much of an advantage from them ( even if they don't break!)


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[Sam@NP]

As in the wishbones? Is it all spherical bearings / rose joints or do you still have bushes in there somewhere.

I guess the only advantage is the possibility of a bit more castor, and maybe the smallest amount of extra track width, but it would be negligible.

I don't think I would run these over the setup you have suggested either, but I get frustrated when people say something looks s**t without giving a reasonable of justifiable reason. I think looking at it he wishbones would be fine. The ARB mount would be s**t and the OBJ or lack of it may be an issue if the build quality tolerances were s**t. But as you have said I don't think there is much of an advantage from them ( even if they don't break!)


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Nylon bushes that much stiffer then the road car rubber items, the only rose joints are on the RCAs

 

[_WILL_]

Are the inserts for camber adjustment? Just googled the cayman suspension online. Must be great for working on.

Have you changed hard points etc.

Actually I'm just going to go read your build thread!!


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[Sam@NP]

The build thread is very out of date I'll update it this week. The only hardpoint that has been modified is the top mount by about 25mm inwards. The 997 arms and uprights have changed the front kinematics a fair amount.

The inserts are for camber and the slot in the middle for caster.

 

[_WILL_]

So I am guessing you have dropped the roll centres to account for reduction in CoG?


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[Chip-mk1]

I don't see what advantages these wishbones offer over a set of standard items with polybushes and camber bolts.

Spherical bearings have less given than poly bushes.
They are adjustable to potentially allow you to fine tune track/toe/camber/caster.

But more importantly, the longer pin alters the geometry in terms of the effective wishbone angle and thus effects roll centre, thats where the real gain potentially is from this sort of setup.

 

[Sam@NP]

Spherical bearings have less given than poly bushes.
They are adjustable to potentially allow you to fine tune track/toe/camber/caster.

But more importantly, the longer pin alters the geometry in terms of the effective wishbone angle and thus effects roll centre, thats where the real gain potentially is from this sort of setup.

The RC adjustment is the only one I see as an advantage over the standard items with the appropriate bushing control.

So I am guessing you have dropped the roll centres to account for reduction in CoG?

​Yep only at the front though not the rear.

 

[Chip-mk1]

The RC adjustment is the only one I see as an advantage over the standard items with the appropriate bushing control.

Yes its the one thing that is likely to benefit people, especially if running very low.
But as mentioned, the risk of failure is not something to ignore.

 

[_WILL_]

Yes its the one thing that is likely to benefit people, especially if running very low.
But as mentioned, the risk of failure is not something to ignore.

Which bit are you talking about to change the roll centre? Which pin is longer?

 

[Chip-mk1]

Which bit are you talking about to change the roll centre? Which pin is longer?

The pin from the rise joint to the hub. If the centre of the rose joint is lower than the centre of the original ball joint relative to the wheel centre it will alter the RC

 

[Matt@codered]

View attachment 101144
​Like this.

 

[bozothenutter]

like what you did there!

 

[_WILL_]

Ah I see what you mean. I didn't realise that's what you were talking about. I think I prefer the setup in the picture. Much cheaper alternative? And very easy to make RC adjustments by just changing the length of he adapter bit.


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[Chip-mk1]

View attachment 101144
​Like this.

Yes thats the kiddy.

The part of the joint that actually moves is now a lot lower relative to the wheel centre and so has altered the roll centre, important on a car that is lowered a lot.