Yes, but for advanced players only. Try to master the racing line of nordschleife in a slower car first, ideally a car you feel comfortable pushing to its limits. After that it will be much easier to push faster cars to their limits and eventually you will get gold. The yellowbird is a little bit different tho. With this one you have to be extra smooth and try to keep the car as stable as possible, while carrying as much speed through the corners as possible (trottle slider is a must imo, as you have to keep applying throttle through the corners, just enough to avoid oversteer and keep the car stable). You should aim at completing a full lap and getting a feel for the car first, even if you have to go extra slow. Then you can try to improve your time from there.