So I've spent a bunch of time trying to sort this out and wondering what else I could use to sort this issue out. I have a fully rebuilt streetport motor, exotic large turbo (where my issue lies I believe) and deleted OMP so full premix. The motor runs like a dream and there is zero smoke at idle. I do get some on cold start which I know is pretty normal and then it fully clears up. I have put a go pro on the back of the car and I spit out a puff of blue every single time I let off the gas at any rpm (so during shifts or just deceleration). Now I do have the oil filler neck run to an oil catch can and then routed pre compressor housing so I am sure it shouldn't be too much crank case pressure. I have pulled the plugs and there is zero oil inside the motor itself. Now I know I have an upgraded oil pump so I range 130-150psi oil pressure that will drop down to 80 at idle. I am running -3 to the turbosmart oil regulator which has been able to bring the pressure down to 50psi and has led to the car being drivable and not whiting out my neighborhood, but I have a feeling this is still too much for this turbo. By exotic turbo I mean its off a 2005 champ car and is a triple ballbearing setup that IHI made for the race teams only. I think I need to drop the oil pressure even lower but cannot find anything other then the turbosmart piece. I have also tried the smallest reducer inline but that doesn't help at all, actually makes it worse. I'm hoping someone has an idea as I'm spent trying to sort this issue out. For a last bit of info I have a -10 drain off the turbo so I don't think its an issue with the turbo draining.

 

I Honestly don't see a reason why you need 130-150psi of oil unless this is a drag setup high boost, high HP deal. You need to change the oil regulator to a stock FD one (110psi max)

 

my car started smoking when I removed the pcv to the UIM and only had the catch can routed to the turbo inlet, I added back the pcv valve and line to the uim and that solved it.

you can also try this: Turbo Oil Regulator - Freelance Motorsports LLC

or maybe your turbo is leaking

 

I run the rx8 oil regulator and I was getting way too much oil pressure with 20w50 or 15w40 on startup (115+ psi). I found 10w40 to be the sweet spot for my climate. Startup 115 psi and warm is like 55-60 (bp, high idle)

I would also blow a ton of smoke from the turbo getting too much oil pressure. I installed a freelance regulator to cut the pressure in half.

I think we all agree that there is no need for that oil regulator you are running, but you may try so thinner oil first to see if you can cut some of the pressure without having to pull the pan and swap regulators.

Also their is a misconception that BW turbos don't need restrictors, which is true because 99% of BW customers have piston engines.

I went do to BoostLab which is 20 minutes from my house and talked to them about my turbo when it was smoking brand new (this was 3-4 years ago).

They said "BW turbo's don't need a oil restrictor, how much oil pressure do you have at the turbo?" I said 115 psi at startup and above 3,000 RPMs and I shift at 8,200, and their tech immediately said "Oh yeah, you definitely need a restrictor"