Serious chassis question. Moving a steering rack

That is an extremely good point, saabsled, and I can't find it now but I did see a forum where someone had done a load of work and ended up with just that problem

Ackerman is important, not least because you don't want to wear your tyres out but only really has an effect when the wheels are moving through a wide angle, in most cornering you are leaning on the outside wheel and not turning the wheels that much, so bumpsteer will affect you much more, cause if it's wrong then the car will be doing a rodeo bull impression with every rut in the road. A mate with a '34 Ford got this wrong and it just dived around the road like a Oliver Reed on a monkey bike. Scary.

There's two rules for Ackerman, some think the insection should be at the centre of the back axle, others two-thirds of the way along the wheelbase, but in the perfect point is probably between the two and depends on how much your wishbones and bushes deflect when you're cornering hard, because this moves the steering arms in relation to the rack.

Early Lotus racing cars used to run with incorrect Ackerman because Chapman thought that having the wheels parallel to cut down on wind resistance was more important than the angle of the inner wheel. Bit mad but he did know a thing or two so maybe he was onto something. Wouldn't make any sense on a road car mind.

U CAN MOVE IT UP OR DOWN AS LONG AS IT IS THE SAME ANGLE compared to the lower arm angle.. viewed from the front..
ie if you move the rack dowm 4 inches the arm conected to the strut needs to meet the trackrod end knuckle at exactly 4 inches lower also and within the same plane (distance away from the strut)
also it has to be in the same angle looking from the top ie plan view to give the same ackerman...

if moved in front it has to have the same angle but oposing (angled outwards) on the same imagenary line of ackerman
also remember that if a rack is mounted at the front when it used to be behind the stearing pivot point.. then the car will turn the wrong way than the wheel is turned...!!
a lhd rack of the same type can be mounted upside down to overcome this...
or a rack that is normally used infront the stearing pivot..
but the rack must be at least the same width of inner pivoting ball joints as the inner pivots of the bottom arm pivot ar the arc radius will affect the toe in/out causing bump steer etc...
i hope this helps.... its hard sometimes to get across what i am meaning without knowing your perticular background on chassis dynamics..
si