I have one for drags. She's plenty fast enough,but wipes out and totals when I hit nitro. Yep,she's maxed with all level 4 parts. I don't want to sell her. What can I do to keep her from going out of control? I really want to keep the car.
Lower the ride height. That reduces body roll and helps to keep the car stick to the road.
And you may want to check your CRM Timing in the tuning section, I advise you to move it down. That way less torque is delivered to the wheels at higher RPMs and you have less chance of spinning out. It may affect your speed, but at least you won't spin out. Try to find some sort of balance.
And also, when you punch the nitro, make sure you aren't even slightly turning when you do it. Even the slightest overload of torque will induce the car into a spin when turning.