question for turbo experts

[camcojb]

I'm trying to absolutely pinpoint the cause of the smoke. I suspect it's still from the turbo. If you drive around it's fine but smokes on one side only at idle when fully warmed. As soon as you take off again it quits.

I let it idle until it started smoking, and then brought the rpms up to 2000 rpms or so, and the smoking stopped. What I'd like to do is rig a 1/4 turn gate valve in the oil line for that turbo. Get the car up to temp and smoking at idle and shut off the oil for a brief period.

These are water-cooled ballbearing turbos. I cannot imagine shutting off the oil for 20-30 seconds at idle could possibly kill the turbo, but that's the only way to absolutely verify that the oil is coming through that turbo.

Any thoughts from someone who knows more than me? I won't drive the car with the oil shut off, just idle only for 20-30 seconds; that should be enough to make the smoke stop at idle if this is the cause. If it doesn't then it has to be coming from the engine. This is the only way I can think of that will tell me yes or no; I need to cut the oil off immediately while it's smoking to see if stopping the oil stops the smoke. Anything like shutting it off and removing the turbo, etc. takes too much time and effort and it'd have to run a long time to get it back up to temp.

Jody