XRAY - Model racing cars

Hi, I had a little play with these at a practice day and found that they made quite a dramatic difference to turn in. I'm just curious about a few things with it:
- How do they affect the car?
- Are they a setup change you would think of doing at practice or a race day?
- What's the ideal range of thickness shims? (e.g 0mm-1mm?)
- What surface is it best for? Carpet? Asphalt?

I'll be going for a bit of testing/practice this Saturday on high grip carpet and would like to give them another try.

I'm running a T3 if that is of any help.

Thanks Jonathan Forse

If you open up the Setup manual and go to "bump steer" all will be revealed

Thanks Yellowshark Seemed a bit of a stupid question now.
My bad