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Originally Posted by Aragorn30d
While i dont dispute it worked for you, it doesnt really make sense.
Black smoke is excess fuel. ALL diesel engines will produce some black smoke at full power, and mapped ones will produce more. Its a fundamental part of diesel combustion. If theres no smoke, your leaving power on the table. Mapping diesels is so effective because the manufacturers tune the car pretty lean, to minimise this smoke, and running more fuel is where the extra power comes from. Highly tuned dervs will produce thick black plumes of smoke (check out tractor pulling), but its generally infeasible for a road car for obvious reasons.
Most dervs sold in the last 10 years or so have DPF's fitted, which catch the soot, and thus appear much cleaner. The soot is still being produced, its just being caught in the fitler and burned off. If you delete the filter, then ofcourse the cars going to emit that soot as black smoke instead.
The breather, if faulty, might allow some excess oil to get places it shouldnt, but oil doesnt produce black smoke, it usually burns white or blue depending on quantities and where its getting in. Thus changing the breather is thus unlikely to have an effect on excess fuel...
Its perhaps more likely that dismantling and reassembling everything when doing the breather has fixed a boost leak or something that was previously not quite right.
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Very intresting post, I actually enjoyed reading what you wrote, very informative.
As to the breather, im not sure what its done, but its been coming upto the 2nd week now and my exhaust tips, bumper are spotless.
However, in regards to your post, it does seem like i am starting to see more white smoke?