Originally Posted by
pcar951
Funny...I'm chasing the exact same thing with my boosted car (carpet). I'm guessing, piled up bearing or a binding drive shaft. I'll let you know once I tear it down.
I've had the spur layshaft screws come loose or come out on one side and it caused funky handling like that. After a few laps it tends to turn the spur into a smooth plastic disc
Also, make sure the spur bulkhead and motor mount screws are all tight. If one loosens, the motor torque can lightly tweak the chassis when you accelerate or brake.