Last night I can't sleep
I've been thinking about the servos... You've right. I put these TowerPro servos only for test run (no high speed, no hard bashing
), into the carburetor there is a spring on the throttle cable, it works as a manual "fail safe".
After some tests, I'll replace the servos:
For steering: 1 Tonegawa PS-050
For throttle / brake: 1 Brand (Futaba, Hitec, etc.) Servo ~15kg @ 6V, I didn't choosed yet.
After these modifications I can safely drive the car on high speeds... Thanks for you help!