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You do donuts if you turn right, but you do a wide turn if you go left? What if you go straight? Because your problem may be your steering alignment. Try moving straight forward or backward. Is it possible? Or does the car move left/right? If it doesn't go straight, flip your car over. There should be a clear (it could be another color if it's a Bit Char-G or a knock-off, I've only dealt with MicroSizers) stick underneath the steering assembly. Move that a couple clicks to one side. If that makes going straight worse, move it a couple clicks to the other side. Keep doing this until you're car runs straight.
If you're not getting enough traction, you need sticky/soft tires in the rear. But don't want sticky tires in the front (unless you want to do stunts...). Sticky in the front=insane flippage. Medium or hard in the front=allows you to steer without flipping. The harder, the more understeering there is, but the softer, the more flipping there is. It really depends on your motor. I'd say 3.8 and above require hard front tires, anything below requires medium.
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