i bought a ls motor from a friend that had it in his can and it ran great, compression tests about 210 on all 4 ... in his car it ran great no smoke or anything.... so times comes and i got all my turbo stuff on and i cant figure out why the car smokes so bad ... i bought the turbo rebuilt from a reputable guy but im thinking maybe my restrictor isnt small enough ... what size reducer is common for a journal bearing turbo?

since the picture ive redone alot of stuff and made the return line a lot shorter

 

nobody has a comment .... or know what restrictor they are using??? LIKE WTF

 

anyone have an idea??

 

I never ran a restrictor in my journal bearing turbo and never had a single issue with smoke. How bad we talking? Is it only under boost? The compression might be dandy, have you done a leakdown test? Is the PCV valve working correctly? You might want to get a filter on that turbo...

 

What type of turbo is it. I have a precision turbo journal bearing and run a -3 line to it and they advised me at precision they dont run restrictors unless it a ball bearing turbo i dont have one on my car. when is it smoking the most at idle, while driving, going into boost? this all makes a difference on what it could be. you said it was recently rebuilt i would have the turbo checked again to make sure everything was place together correctly. or may be a faulty seal.

 

its a garrett t3/67 ... when the car is idleing there is no smoke .... when the car is revv'd up it smokes .... it also smokes when im driving and after boosting coming to a stop

 

I had the exact same problem for some time and it ended up being valve seals they were cracked and toast causig the oil to leak down on the valve and into the combustion chamber. when did it start smking did you run it hard first or was it when you placed it in your car. was the motor boosted on before.

 

i got the motor from a good friend that had it in his car ... it never smoked ... then i put it in my car and boosted it ... and its been smoking ever since ...

 

How long after did it smoke like right when the motor was dropped in or after running it hard have you done a recent compression test on it.

 

do you have any real crankcase ventilation???

with a lack of a way for the pressure being built up in the crackcase to escape, maybe you are pushing some oil past the seals.

 

i never ran it in my car without the turbo ... but since its been in my car is has smoked since ... i tried redo'in my return line ... and a few other little things but does not seem to fix it .. i have a smaller reducer and plan to pop it in just wondering on some other insight's

 

i dont have any catch can setup right now .. i will be puttin one in soon .... it has not been boosted on hard yet

 

you dont need a restrictor on your turbo, especially with a -3 line.

 

Do you have any ventilation, I see the vc has none?

Do you have a black box on the back still with a pcv? Is that your only source of crankcase pressure relief? pcv working?

I am not saying its 100% your cause of smoking or anything but if you build enough pressure in the crankcase, the pressure will escape any way it can... taking oil along with it. A boosted motor is going to have more crankcase pressure than N/A. So although it was fine N/A and the ventilation was enough then, it may not be any longer with boost (even low boost).

Just a thought.

 

Ditch the PCV system all together. that is going to cause oil into all cylinders but mainly cylinder 3. Whats the tune look like? What are your a/f ratios? if you want to run a restrictor get a function7 .035 . helps with spool and will reduce oil pressure on the oil rings in the turbo. if its a healthy motor that didnt smoke at all with no turbo on it then you have a problem with the turbo or oil drain line or pcv system.

You should be running a catch can with at least 2 -10 fittings off the front of the VC. What size is your oil return line? where on the oil pan did you locate it? if its to low like in the oil level it will not drain and cause oil to back up into the turbo and will give you smoke. It needs to be close to the mounting flange of the pan as possible.

I know you said you changed the oil return line around some but post another pic because from that pic you have it angled right off the turbo which is not good. it needs to gravity drain so you need as straight out of the turbo as possible and make bends or angled fittings be at the oil pan but keep it as straight as possible. going around the charge pipe like that with it not having much of a gravity drain will 100% cause turbo oil burn smoke.

also need to get that oil feed line out from between the manifold runners. bring it around the front of the manifold strapped to the radiator support and get your self a 90 degree fitting off the turbo and connect your oil feed line to that. you can and will melt that oil feed line. its rubber inside and that kind of heat will most definatly melt the rubber inside that stainless line.