Car speed from tubes, bumps, and curbs is FPS-dependent:
Consoles: 60FPS (or 30FPS)
PC: Can exceed 30 or 60FPS, so a consistent FPS is necessary for fair testing
59FPS: Preferred by stunt racing pros, as it provides better speed on bumps, curbs, and in tubes
130FPS+ (High FPS): Faster than 59FPS, increasing speed up to the FPS cap (188FPS on PC Legacy, 163FPS on PC Enhanced)
FPS can be capped using AMD Adrenalin Software, NVIDIA Control Panel, or RTSS (RivaTuner Statistics Server).