E90

Hello everyone have a ? hopefully some can answer. Just installed brushless system, everything is great, programmer the tx with the esc and everything is good. My problem is that I cant get the throttle trim just right. The car goes forward and reverse just fine but when I try and set full throttle on the trim and let go of the trigger the car creeps up, then I trim it back so it doesn't move. It just seems like I'm working the trim too much to get the car do what I want it to.

I have a evader ext2 and it came with the crappy 27mghz radio from tactic. I'm just guessing it's the radio, and it just can't be fine tuned. Any offer any advice?

Thanks