TC4 gets uncontrollable at over 25
Okay, a while ago I got a used TC4 brushless RTR. Fun car, but I can't keep it going straight on power. Just seems like something is off with the set up. According to the manual, the car is set up from the factory. I've tried disconnecting the rear sway, loosening rear shocks and tightening fronts, etc. the only things left I can try are swapping the tires for some new rubber, as I have a set of older rally tires on it now. I figured they would be great since my street isn't that smooth, but maybe not. Also one of the rear wheels vibrates just a tiny bit, so I think I'll swap the bearings in that. Basically up to maybe 20mph the car is fine. Any faster, or a blip of throttle, and it becomes uncontrollable. Way too much oversteer it feels like. I'm pretty sure the car is geared for around 40mph, but I can't get it even going thirty straight without a catastrophic crash. What are some other things to try?
Side note, I know the motor is a hobby wing, not sure of the size. ESC is a 45amp, and I'm running the car on 2s.
Thanks in advance!
HPI: Cup Racer, SNRS4, NMT | AE: SC10 4X4, T3, T2, RC18MT, TC4 | Thunder Tiger: MT4 GT3
WTB: Super RS4 electric rally
FS: RS4 3 SS w/ OS .18CV + RC10GT w/ Megatech .16 pull start