Black Smoke.

[showbizz]

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.

[sam5709]

i am under the impression that it is unburt fuel or something, i get it alot cos my car is running really rich (hiflow on 1 bar with stock ecu)

[NISZILA]

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

[showbizz]

it's not for my car luckily lol, i was just wondering cause i have seen it occur soo much on imports (particuly r33,r32s) and was thinking why they all do it.

Cheers for that.

Edited March 10, 2008 by showbizz

[bubba]

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.

[TAKUSHI]

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

that would be white or blueish smoke if oil is burning