Re: What causes heavy steering at racing speeds Im busy looking for the 248 & 167 keys on my keyboard, I must have the budget version ,it only goes up to 9!!!!!!!!
Enough of that crap--- Ross , another area of deflection you may still have in your car is the Nolathane inner bush's of the lower wishbones ( assuming they are still fitted & you have not done any tricks like hide a spherical bush inside them )
Another thing that may help others come to terms with what we are discussing here; I tend to look at this problem as follows--
When this car is on the straightaway I regard the front tyre as only being say 5" wide ( the inner half of the tread width ) and the effective scrub radius of this 5" footprint is probably around 0" to 1".
Now move to the cornering situation -The car now has approx 2 or 3 deg of body roll, perhaps 5 +deg of steering lock, and the lower wishbone with lateral cornering loads has deflected inboard /rearward.
Lets assume that the static camber was 3 deg negative.
The changes of body roll- steering lock- deflection @ say 3-1-1 degrees each will have moved our static camber from 3 deg neg to a dynamic 2 deg pos. Now the outer 5" of the tyre width is doing the majority of work and our scrub radius will be in the order of 6" , hence the greater steering effort reqd.
Ross, I guess what Im really trying to say is; Do whatever you can to shift your wheel/tyre inboard in relation to the upright/stub axle- Compensate for this inboard shift with new longer top & bottom wishbones with rod ends at inner pivots along with any tie rod extensions that it may require.
Jac Mac
Last edited by jac mac; 06-20-07 at 05:28 PM.
|