Front Top Wishbone Mounting Positions

[CarlW]

I will model up the book one and see what the angles are like.
I wanted to start with 0 - 2 deg camber and 6 deg castor 0 deg toe.

The top has to be right or will need tweaking to get right so I like to try right first time lol

[CarlW]

Hi all,

I have modled up the top and bottom wishbones to the book and I measure a castor of 8.4 degrees. Isnt this a bit to much for the Sierra upright set up?
Camber is measuring 0.7 degrees but this is obviously adjustable.

[garyt]

It shows as a lot ( don't know what the optimum should be) as our 7's are notoriously hard to get the self centering required for iva many have failed on this point so I guess the book works out that way to ensure there is some compliance
As I mentioned earlier I am able to shim mine and ended up with 1 x misalignment washer at the rear of the mounting bracket then the rose joint then the shims in front this gives me the trail required and I am happy with her now
Oh should have also said I am using mx5 uprights so can't be sierra specific sorry
Gary

[garyt]

Just out of interest I just googled optimum castor angle.and it seems over 7 rev is common ...... mmmm

[CarlW]

Hi ya,

I would rather have say 7 degrees and the shim if needed, 8.4 just sounds tomuch, over kill?

[garyt]

Yes that sounds reasonable I also got an old skool tester who said " mm rear wheel drive I will give it some throttle, that will help" and off he went
The problem with iva is that it says int book of rules "must show a degree of self centering " now if that isn't open to individual testers interpretation then I don't know what is
Good luck