Ratio is half the battle, steering wheel diameter is the other half. The bigger the steering wheel diameter, the slower teh total steering ratio of hand movement in inches vs. wheel turning in degrees.
A little research on this showed that with moderate sized steering wheels, many LSR cars use a ratio around 1/10th of their top speed: >30:1 for the blue hats; <30:1 for the red hats. In working out the numbers for 900 mph, we were settling on 90 to 120:1. Interesting correlation across a wide speed range.