Tracking

[Guest Jim Castle]

At the 'tweaking' stage for SVA. Anyone know what the front tracking (toe in) setting should be for a 2B ?

 

Regards

 

Jim Castle

[Bob Tucker]

Hiya Jim,

With the sliding pillars, you can set it up as 0-1mm toe in.

With wishbones, you could aim for 1-2 mm toe in.

Bob

[Guest Ant]

Why so much with wishbones?

[Bob Tucker]

Hi Ant,

I was trying to avoid getting too technical but you asked for it!

The ideal amount of toe-in when running any car is 0 degrees, or a very small amount of

toe in which helps self centering (but not as much as the castor).

 

RWD production cars have rubber bushed suspension, which allows a slight amount

of movement, so you set it initially to 2-3 mm toe in stationary,

so the drag from pushing the wheels

forward takes up the play which gets us back to 0-1 mm toe-in when running.

With FWD cars the wheels are pulling forward, so you set up toe-out, to end up

with the 0-1 mm toe in when running.

The wishbone suspension is similar to any production car, the bushes allow some play.

That's why some cars feel very odd after fitting the harder POLY bushes at the front.

You have to reset the tracking.

 

The pillars have no play whatever. They use a metal to metal bearing surface

(the phosphor bronze bush sliding on the chrome tube), so you don't allow

any extra for bushing play, just set it up the way it needs to run on the road.

Hope that helps!

check out your local library, there are some excellent books on steering geometry & suspension design.

I'll get details of some of the best I've read recently as research on converting to wishbones.

Cheers, Bob.