Motoring sound on accerelation

[cwspellowe]

This is a hard to describe sound but low in the rev range there is a "motoring" sound sort of like a V8 sound mixed with gurgling. I don't know whether the manifold is blowing but it shouldn't be because I've got a new gasket on it. There also seems to be a pressure building up sound higher up in the rev range, I'm not sure whether they are linked or not.

The first bit is what's called an "engine", it sort of goes chuggachuggachugga low in the revs, often mistaken for a V8 that's been dubbed into 70's chase scenes.

The second bit we call a "turbo" and you're pretty close in that it builds up pressure and, in the words of Jeremy Clarkson, "witchcraft happens" and you go faster.

HTH.