So I am running a long race weekend and treating my engines very carefully. What I do for P1 is just practice with the corner line on until I am comfortable and then restart the session (so I havent wasted a fresh engine). Once restarted I do the R&D objective first and after 2 laps I come back to the pits and switch to a weaker engine so I can save the good one for quali and race. In P2 I practice with my weak engine and do another R&D lap for the same upgrade as P1, practice some more and then go on to P3. In P3 I do another R&D lap for the same upgrade and when I am happy I switch back to a good engine for quali. My problem is that my R&D never actually gives me the upgrade! I am at instanbul now and I am still trying to get the "reduce rear tyre drag 5%" upgrade. What am I doing wrong??