Originally Posted by Shawn68z
The hitec servo you posted is really slow for 1/10 steering servo. You need something closer to the .10 sec for your transition time.
If you want to stick with Hitec look for 6975 (144oz, .10sec), or the ultimate steering servo Hitec 7940 (180oz, .07sec At 6.0V) But you can also run it at 7.4V for even better performance.
Actually, the JR DS8915 has better spec, same speed .07sec@6V but 12kg*cm of torque which is higher than the Hitec. It is more expensive, but it is top quality. I am not sure ont he other hand why it is not very popular with car racing, I found it indeed the best in every aspect (reliability especially is a weak point for Hitecs).
There is an even faster JR servo (.firstname.lastname@example.orgV), the DS9100. But that is a gyro controlled servo for the tail rotor in helis so it doesn't have the torque, doesn't like more than 4.8V and it is going to be twitchy for a car. Plus it may be hunting if the response is not turned down (i.e. at zero dead band) which will defeat the purpose of having fast response.