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I have heard that when you 'gun' it, the engine management system puts more fuel into the engine to protect it, so you'll get a puff of black smoke when you hit high rev's..

N/A cars also do it as well, when you drop back a gear and plant your foot, a small puff of smoke will blow out the back.

That's what I've heard, I'm not sure, I'm no mechanic...

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black smoke = carbon from unburnt fuel. if you have a std ECU this is probably the problem.

white smoke = turbo seals are gone or going as oil is leaking through turbo somehow

blue/white smoke = excess blow by from engine. possibly worn piston rings causing oil to escape through exhaust manifold then out exhaust.

best way to tell is, are you losing oil? if not then its probably carbon, if you are then investigate further.

or get someone to drive behind u and tell u what colour the smoke is when u nail it

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