x-35 engine black puff?

[shah269]

Guys,
I'm a little confused and i'm not sure what i'm seeing.
But over the past few months while driving behind other BMW's that share the same twin turbo engine as ours I've noticed something a little odd that I haven't seen since the old Ford Probe Turbo's or the old Mitsubishi Eclipse Turbos.
When the car ahead accelerates quickly / hard I've noticed a substantial puff of rather acrid black smoke.
What is this all about?
i'm more familiar with the VW turbos and they don't do this.
what's up with it?
any thoughts?

[Suds]

What were the conditions where you saw this? I may have to have a friend follow just to see if it looks like I'm driving an old MB Diesel Wagon, they look like a tire fire.

Other hand maybe it's the carbon from the intake valves!

[shah269]

Highways....back roads...when ever i see a BWM turbo push off / roll on hard.....puff of smoke...and it smells very acrid!

[PA135i]

Black smoke is oil. White is water vapor. Probably needs his valves blasted.

[shah269]

Yeah it's a nice puff of black smoke and it smells...wooh like burned oil!
I've seen it in 3 series and 5 series....

[PA135i]

You just experienced a car fart. I hope you don't smoke.

[Ammonia]

Not sure if this is proof, but after I had my intake valves walnut blasted, I no longer have black smoke burp out of the car. The first time I saw the black smoke was while I had the car dyno'd.

[shah269]

wow so it's all the DI turbo cars....
well some one may need to have a talk with BMW about this with a legal rep...