Offroad-Express

I have just fitted a turbo to my Nissan and getting a little oil feed back to the turbo, I think the oil drain I put to the sump maybe too low , About 1/12" from the top of the sump.

At times It's great then for what seems no reason I get a mixture of blue and white smoke, I have increased the fuel by 3/4 of a turn and the turbo is top mounted RX7 turbo and has trebled my power no longer do I have a slug of a 4.2 auto.

To save a lot of stuffing about is it possible to swap the return lines over, Put the turbo return line to where the alternator oil return line go's then it would be going direct into the block and the alternator return line to the sump because to my way of thinking it would not matter if there was a little oil feed back to the alternator bearings.

Or will the sump have to come off and shift the turbo oil return line as high as possible???

minefield wrote:Or will the sump have to come off and shift the turbo oil return line as high as possible???

this option...

if the alternator oil return line was used, the oil would not be free to drain away to sump.. it would create a back pressure as such..

is the oil return into sump above the full 'high tide' mark? also, is the drain diameter large enough?

drain needs to be able to freely drain without the oil in sump being in the way and creatin a backfill etc.. it'll force its way into turbo and burn, hence smoke..

me thinks....

Sounds like the return line is too small. It should be 5/8 plus to ensure no back pressure. At the risk of telling you how to suck eggs, do you have a restricter in the oil feed line? Full oil flow is too much for a turbo.
The normal place for the return is into the sump as high as you can make it.
Another thing to look at is the return line coming straight down from the turbo? ie has the core been spun so that the oil return is at the very bottom?