Spektrum DXR3 Steering Rate/Exponential

[apache_sim]

I am using a DXR3 with my Losi 8 and 8 2.0 Buggies.
I thought that the steering rate adjustment or the exponential adjustment would slow or change the rate of the steering movement. All I appear to achieve when making these adjustments is to reduce the amount the steering operates (less angular change).
Can anyone shed any light on what these adjustments do in the DXR3?

Thanks

[Lars Johnson]

Per the DX3R manual (Click here (http://www.spektrumrc.com/ProdInfo/Files/SPM3100-Manual-V3.pdf)):

Steering rate (also known as dual rate) allows on-the-fly steering travel adjustments to be made using any of the programmable grip trimmers (A,B,C,D, or E).

Think of Steering Rate as a way to equally reduce steering throw, or Travel. Once you have the Travel percentages set correctly to maximize how far the wheels turn in both directions, turning down the Steering Rate percentage will cut down on the distance your wheels turn, equally in both directions.

Exponential is used to affect the response rate of the steering, throttle and/or brake. Typically positive Exponential is used for steering, reducing steering sensitivity around neutral and making it easier to drive the car at high speeds in a straight line. But exponential still allows for the maximum turning radius.

So while Steering Rate actually reduces the turning radius, Exponential changes the sensitivity that the steering/throttle will have near neutral. Think of it like - with your Expo at linear (0%), say you are driving your car in a straight line, and you move the wheel 1/4 turn back and forth quickly. The reaction of the steering servo will be standard, or however fast the servo is rated to turn. Now, if you add Positive Expo, the reaction of the steering servo to those quick 1/4 turn movements will be slowed down. As long as your Travels are set correctly, and Steering Rate is at 100%, changing the Expo will still allow for full travel, but it will be less sensitive to quick changes around center (neutral).