New TC78 smokes on deceleration
New TC78 smokes on deceleration Finished my build recently and very soon noticed that after even little boosting, on deceleration cloud of smoke appears behind the car, so apparently TC78 is burning oil. I have 6mm feed line and 16mm drain line (but at very shallow angle). What is the problem? Maybe some restrictor is needed for TC78?
How do you know the smoke is coming from the turbo? Could be blowby in the engine. Putting boost to a motor brings small issues to the forefront. The turbo maight be causing the issue, but I doubt the turbo itself is what is smoking.
because it smokes only on deceleration and only after boosting
Could very easily be your PVC or breather system, oil gets blown into it under boost and under vaccum gets sucked into the engine. Usually under boost will you see smoke when a turbo is letting oil by.
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black98ws6ta: no, turbo sits low enough. pipe goes down about 1.5 inches and is 9 inches long. However when I read about drain pipes, it was said that such angle is OK with a drain line of such diameter
Cobrakiller, I run exactly 5W-30
Some cheapish one (MAG1)
Dean, this was just a TC78 turbo from Forced Inductions. But I don't remember seeing restrictor in the CHRA itself. It had some adapter with filter in it, but I also don't remember seeing any restrictor there...
Cobrakiller, I run exactly 5W-30
Some cheapish one (MAG1)Dean, this was just a TC78 turbo from Forced Inductions. But I don't remember seeing restrictor in the CHRA itself. It had some adapter with filter in it, but I also don't remember seeing any restrictor there...
My suggestion is to run the car do a couple of pulls bring the car back and take off the turbo tubing like the elbow into the intake and see if there is oil in the tubes. Oil doesn't stay suspended so there should be signs of oil in the tubes.
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Your return line should have been bigger(mine is 3/4 0r 20mm) especially if you don't have much fall.
also if you don't have adequit crancase ventilation under boost, crankcase pressure will prevent or restrict your turbo oil drainback.
also if you don't have adequit crancase ventilation under boost, crankcase pressure will prevent or restrict your turbo oil drainback.
Thanks for all replies. I'll try to answer all of them:
98Z28CobraKiller: are you serious about that diesel oil? what whould I know by doing this? yes I'm in cold climate and I always warmup fully before putting more than 2000rpm or more than 70% throttle
52172: how do I make sure it is vented?
Johnv: so 16mm ID is not enough for drain????
98Z28CobraKiller: are you serious about that diesel oil? what whould I know by doing this? yes I'm in cold climate and I always warmup fully before putting more than 2000rpm or more than 70% throttle
52172: how do I make sure it is vented?
Johnv: so 16mm ID is not enough for drain????
mine was doing the same thing. my turbo sits pretty low aswell, I decided I wasnt going to mess with it and bought a return pump. ($100) I have a -4 feed, a -10 off the turbo (about 6-7 in. long) then a -6 to pump and to the pan. havent seen smoke since. 
This has nothing to do with the Turbo. When decelerating with closed throttle, your engine is under tremendous vacuum. Traditionally, when an engine smokes on deceleration, it's pulling oil past the valve guides/seals, onto the back of the valves, into the combustion chambers and burning.
If it was smoking on acceleration then I'd say 'maybe' your drainback or piston rings. What color is the smoke? Classically....
Blue smoke = Oil burning
White smoke = Coolant burning
Black smoke = Too rich.
If it was smoking on acceleration then I'd say 'maybe' your drainback or piston rings. What color is the smoke? Classically....
Blue smoke = Oil burning
White smoke = Coolant burning
Black smoke = Too rich.