IMO You don't need torque on the throttle and mixture but you really need the ones that can stand on the vibration from the engine. Here is my suggestion:
- Mixture: go with "rigid" mini servos for lighter weight and power consumption. The 3155 will work. I don't have a CarbSmart but I've seen someone using those servos on their setup.
- Throttle: same idea but you really need something that's fast. The S9650 has been working great on my Synergy N9. The S3155 will do the job well too.
I don't recommend using micro servos on a nitro because they don't have good vibrating resistance.
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