I have read in the A45 AMG forums that besides the race start, there is also another "soft start" function by setting Sport handling mode and S in gearbox, left foot full on brake and right full on throttle. I tried this but in my GLA with 1200km but the rpm did only go up to 1100 and not 3000 as it was supposed to. Has anyone tried this and confirmed that it works in our cars?