My Gulf March 2013: 17.000 km, original BB, less noisy when cold, noisy around 100 km/h (sometimes see later) Super Max sprocket (didn't make a difference in noise), Red Line oil (almost no difference in noise) no NVH. Rineke's M3W August 2013: 14.000 km, original BB, less noisy when cold, noisy around 100 km/h (sometimes see later) Super Max sprocket with a loose belt (didn't make a difference in noise), Red Line oil (almost no difference in noise) no NVH.
Our experience is that the amount of load on the box creates the noise. During our Tuscany trip we had some motorways where we drove 105 km/h. Mine was extremely quiet ( so quiet I could not believe my ears, it looked like if I was driving a Rolls Royce instead of my M3W) when I asked Rineke at a coffee break she said her was screaming like hell. But also mine with the same speed (105) could make noise like hell when the road goes up a but or strong head wind (so more load on the box) And in that cases Rineke's box was just normal screaming. So our expieriences are so that any bevel box can be quiet but only at a certain load (not speed). That the load get's higher on more speed look understandable for me. But ......... why it sometimes scream with a much lower load (e.g. 70 km/h in 3rd gear on a flat road) I don't understand. And when going uphill with the same speed and gear it's silent again.
