I have a '02 Turbo with UMW Stage 2a Turbos and a pair of FVD Straight pipes. Sometimes when I start the car I get a just a Puff of Black smoke that comes out upon starting the car. It immediately goes away after it starts but sometimes its a good bit of black smoke?

I talked to a Porsche tuning shop near me and they said thats pretty normal as with the Flat engine design oil car burn on start ups because of the way the oil sits in the engine.

I was wondering if anyone else has noticed this? Also I do have straight pipes so I thought maybe the deletion of the cats and muffles would make it happen more often since there is nothing to "soak" up that unburnt fuel/oil?

Any advice is greatly appreciated.

 

Black is rich mixture of fuel..
Bluish white smoke is oil..
White is water/antifreeze..
It probably is a bit rich on cold start until computer adjusts,, plus you have no cats, so its more noticeable..

 

Thanks, I did a little more research and found that it is a pretty common issue on these Porsches.