I bought some waterproof brushless combo (ESC+motor)
I think there is a problem with setting in this ESC because

- Backward has much acceleration than going forward.
- If I change motor setting to normal, the car won't go forward
- If I turn off the transmitter first, the car will go forward slowly
- Weird throttle (unstable)

- Backward has much acceleration than going forward. Reverse two motor leads
- If I change motor setting to normal, the car won't go forward Calibrate ESC
- If I turn off the transmitter first, the car will go forward slowly NEVER do this, always car off first
- Weird throttle (unstable) Perform above steps and get back to us

Yeah, sounds like your wires to the motor are reversed, or need to reverse polarity the throttle (channel 2) on your radio.

Also, try re-binding your radio and then re-calibrating your ESC but mostly I agree with the above posts about the wires not being hooked up to the motor correctly.