Question about smoke out of turbo.

[Moparict]

After I make a pass at the drag strip and let off the throttle, the turbo smokes a bit.  It clears up shortly after, but it will smoke for a bit.

I've got a feeling that the restrictor in the oil feed line is probably letting too much oil in at high pressures.  Is this a bad thing?  Should I just accept it as part of running a turbo?

[sportbikeryder]

It is probably fine. What kind of turbo is on the bike (journal or ball bearing)?

[Nem]

You can make adjustments for your drain or run a scavenge pump.

[Moparict]

It is probably fine. What kind of turbo is on the bike (journal or ball bearing)?

Journal type.  It's a Master Power.  Bike runs great and never smokes unless I'm on the track making a full throttle pass.  Then it only does it when I let off the throttle at the big end for about a minute or less.

[sportbikeryder]

If you aren;t getting oil deposits in your pipe, I'd leave it alone, but keep an eye on it.

[Rev Rider]

Mine does the same thing and I have rebuilt the turbo and checked every possible draining scenario I can think of.  You have to stay in boost for at least 10 seconds or it won't do it on mine, but then decel is incredibly foggy.  I am wondering of it isn;t a blow-by build up of crankcase pressure that when let off and aided by sudden vaccuum is pushing oil past the valve guides.  Once she slows down she cleans up and behaves perfectly until another extended acceleration run.

[Dan.J]

It will do this if you run your oil level on the high side aswell untill it burns off enough that it stops doing it

[Bamboozler]

Draw through with dynamic seal instead of carbon seal on the turbo?

[buzard]

not a big deal. it is backup from the pan. oil comes to the front of the pan and keeps oil that normally can drain into the pan in the line. it creates pressure in the drain line and a turbo will find the path of least resistance for the oil (past the seal or bearing).