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Originally Posted by SupraDupra
I have never seen black smoke from a rich condition.Likely he's been running race fuel and is burning his head out.At least that's what I've seen the most.Can't usualy get away with 110 octane with stock heads.Just my 2 cents.
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I see black whispy smoke from most modded turbo cars. especially poorly tuned ones. Gas burns with a black smoke when it isnt attomized, as in burning in the exhaust or not completly burning inside the engine. run your car at a 10:1 af ratio and see what the exhaust looks like lol.