What do you normally fill up on? I ask as Audi only say 420PS/430Nm and 21mpg using 98 RON fuel, and that anything lower will result in a "slight" reduction in performance.
Well, that’s an interesting question, and needs some clarity...
Since I took delivery of the car I have felt it lacked spark, lacked a little performance and simply felt sluggish or for want of a better word 'flat'. I was getting a very slight hesitation under hard acceleration and over 6K it seemed to loose sharpness and fall away which is not quite what it was supposed to do.
I had it checked by the 'experts' who said "nah, its fine" but 2 weeks back I had an emissions light appear on the dash and took it back to Audi to sort it. They found out there was a problem with the engine breathing, hence the light, and hence my conclusion that it wasn't right, which it wasn't. During this time I had changed between Optimax and normal Unleaded and it made no difference.
However, now they have sorted it, its pulling as I would expect 420ps to pull, like a rocket and the hesitation and the drop off over 6K has gone now, and it pulls like a train all the way to the limiter. It feels like I have gained 50 horses and it is MUCH better. So today I went Optimax and I will see if this now improves it again.
I now have an RS4 that pulls like I would expect.
