Where I work (next to a bypass) you get a lot of boy racers driving past all night. Anyway there is this one car (cant tell what it is, cos there is too much body kit on, might be a fiat) and it drives up and down several times a night. Its got something on it that makes it sound like a jet engine when it gets to the top of the revs. It sounds really throughty low down, then when he floors it after a bit you get this lovely (very loud) whooshing whining noise. Its so loud that when its going down the bypass we can hear it from about a half mile away. I think its got a turbo, but I am not sure. It drove round our carpark once and I think I heared a dump vavle, but it was very quite. Cant here a dump valve when its going down the bypass, but you can hear other cars with them when they go down.
So what do you reckon could be making the noise?
Paul
