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  Clio 172
When caning my 172, sometimes there is a noise like a turbo waste-gating through a dump valve, but not on the over-run, it's when the motor is "on cam".

What is it?

I have a reasonable mechanical understanding, give it to me straight!
  Clio 172
Not too bad. Not as loud as a dump valve but the same sorta frequency. I heard the same sort of noise in a mates MK1 1.2 in a certain wind strength but I'm thinking this is more "enginey". It's overcoming a great deal of induction roar.
  Clio 172
My car has an induction kit, i'm unsure of the make, but it gives a positive roar as opposed to this annoying intermittent fart!!