Sbr G50 turbo smoking

[blaise2gst]

Turbonetics style g50 has oil in the turbine side exhaust housing. Recently i was doin a nice full throttle pull and looked in my rear view mirror and the road was fogged out w/smoke.

I think this is a oil pressure issue? The lower b/s is eliminated while the upper shaft is still in place. It's being fed by the ofh with out a restrictor or relief porting. I called slowboy prior to install and they said it wasn't needed. I have a -4an feed line and a -10an return unkinked. Also want to add pcv system is all up to date.

Would it be possible to just replace the exhaust seal or am i looking at a full on rebuild? If so is this style g-50 a good model to stay with (not the kinetic series) or is it a common problem with turbonetics as well?

 

[JusMX141]

90% of the time, once the smoking begins it doesn't stop even after restriction is added. This is because of the oil which passes between the seal and the housing and burns to both parts, causing imperfections in the sealing surface.

If there's no shaft play, this is a classic example of too much pressure at the inlet or the inability to drain properly. There is zero oiling information available for these turbos- and my rule of thumb is if the manufacturer cannot tell you the specific oiling requirement for the turbo they're producing, then they should not be producing turbos.

 

[Dsm4lyfe12]

Justin, stupid question but what causes too much pressure, and is the turbo junk after it does blow smoke caused by this?

 

[JusMX141]

Justin, stupid question but what causes too much pressure

Sourcing the turbo's oil supply 8" from the oil pump.

and is the turbo junk after it does blow smoke caused by this?

Refer to the first line of post #2.

 

[lauj2gdsm]

my sbr g50 is running fine.. oil feed from the filter location with no restrictor.. no problem 4yrs 10k.

 

[Dsm4lyfe12]

Thanks Justin!

 

[Aproductions]

Not trying to steal this thread or anything but how do you know what lines to get for a turbo?

Like I just built my motor and deleted the balance shafts and ported the oil thing on the head and I just got a Holset H1c from you Justin.

Obviously I don't know what my oil pressure is until I start it up for the first time but how can I be safe and make sure my Holset gets the right oil pressure the first time?

 

[JusMX141]

You're not going to kill any turbo in the first time the engine is run unless the turbo is getting no oil at all. Running a turbo without oil for three seconds causes as much bearing damage as running an engine without oil for three minutes.

You should have enough of a chance the first time the engine is run to get an idea of what your oil pressure is going to be. The only way the oil is going to dam up in the cartridge is if you have an insufficient drain.

 

[Aproductions]

So should I run the line from the head or OFH?

And also what size in and out.


Thanks.