Hi driving back from work last night in my 335d. It was a 140 mile round trip yesterday. I drove an average 80-90mph going and as it was past midnight an average of 90-100mph coming back. Towards the end of my journey I was going up a hill when I decided to hit the gas and see what it could do. I got to 120 and decided not a good idea so slowed down again. After a few second I thought no try it again. I did but this time no boost. Arrrgggggg. Tried a few times but no boost. Finally came off the motorway and drove on normal roads and boost fine to say 50-60mph. Above this definate lag. Anyone help please.
