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F1 2014 Terrific problem

F1 2014 The Game (Codemasters)
I had to reinstall F1 2014 and now I have that problem: my car is so slow, don't have increase of speed , every AI car overtake me on straight as rocket, I cannot reach top speed in high gears, on Mebourne straight it's difficult to achieve 7^ gear, it looks like the car is slowed down.
Setups are same of before, even G27 options. If I play F12013, every thing works properly.
I am really confused. Can someone help me?
Thank-you so much
I did verify my game files on Steam (.Verify Integrity of Game Cache).Ok but I get no change.
I tryed race in Monza with Mercedes : with rear wing on 1, at the end of the main straight I achieve 275km/h in sixth gear, cannot shift to 7°. Do you think is normal?
Please let me know any suggestion
Thank-you and happy new year
Try to check your pedal base, look for dust. I know with g27 it's small chance, but I had exactly same issue with my old momo wheel. Hope it helps.
I don't think so, because in the others sim-races, it works normally, even in F12013
BTW thank-you for your suggestion, really depressed not having any solution.