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Interested in knowing why quite a few imports i have seen (r32s,r33s, etc) blow quite large amounts of black smoke out the exhaust when being on dynos or even just giving it a nice boot? is it at all a bad sign? meaning engine is on the way or has been thrashed in its time?

Cheers.

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Two reasons for black smoke. Need to change the oil or car running rich. If you haven't changed the oil in ages, do it now. Otherwise, running rich is fine. As sam says, its just some unburnt fuel. Most likely reasons. You need a tune and your O2 sensor has probably died :thumbsup:

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Because they naturally run rich to be safe, even once tuned they tend to still be a little on the rich side to provide a margin of error with the forced induction :(

Mine is tuned but runs rich because I didn't want him to lean on it at this stage.

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  • 2 weeks later...
Two reasons for black smoke. Need to change the oil or car running rich. If you haven't changed the oil in ages, do it now. Otherwise, running rich is fine. As sam says, its just some unburnt fuel. Most likely reasons. You need a tune and your O2 sensor has probably died :thumbsup:

that would be white or blueish smoke if oil is burning

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