Smoking when stopped?

[RideNslidE]

so ive had this problem about five times or so. Whenever i come to a stop for over a minute and a half, my exhaust starts smoking ALOT. It seems to be a blue color. If i press the gas and get it up to 2K RPMs its seems to dissapate. I have no smoke while driving, only when im stopped for a mintue or more. Any ideas?

[S13k]

Blue smoke means your burning oil

[RideNslidE]

i do relise that its oil. its just weird it only happens when im stopped for a minute, i also wanted to see if anyone has had this problem before and could give me any suggestions to fix it.

[Chris28]

What size turbo are you running? Oil seals require oil pressure to work, if you don't have sufficient oil pressure at idle then the seals might not seal completely and some oil leaks past them. Since this only happens at idle, that could be it. This is only the case with fairly large turbos though.

[RideNslidE]

i have an ebay t25/28 for now. i want to get a garrett t3/t04e 50 trim in the near future. id like to button down all my problems before i add anymore variables.

[WDRacing]

Are you using an oil restrictor? Ebay turbo's are famous for being garbage and leaking oil past the rear seal.

[Chris28]

Are you using an oil restrictor? Ebay turbo's are famous for being garbage and leaking oil past the rear seal.

Yeah my t25/t28 smoked a lot in boost, not so much at idle though. Is it a JDM Sport one? I'm sure they're all the same, but that's the one I had. It lasted basically one track day. No oil in the hot pipe, just out the exhaust.

[RideNslidE]

i am using a restrictor, its the correct one i believe. ive been running this turbo for sevral hundred miles with this being the sole problem. maybe a little very light smoke while boosting but that was coming from my wife in the car behind me when i had the atmospheric bov hooked up. ie very rich on shifts lol .

now that i think about it i have my idle turned up to 950rpms could that affect it?

[RideNslidE]

so i lowered the idle and it seems a little better...

while i had the hood popped i noticed that the rubber elbow from the turbo to hot pipe is very hot and may be smoking a bit itself. i may need more exhaust wrap.

i also went back there and smelled the exhaust and it smells of fuel. after looking at it its probably just white smoke, so im kinda stumped now.where is this fuel coming from?

just so everyone knows i have a:vortech fmu stock injectorsn60 maf safc2 (no fuel changes just to run the maf)walbro 255

[WDRacing]

Drain your oil and see if it smells like fuel. Running rich would be black smoke, not white. White is water.

[RideNslidE]

i did an oil change like 5 days ago. it did smell like fuel, my car was running like crap before i got the little stuff sorted so that oil saw crazy rich conditions.

water huh so a headgasket maybe then. it just diddnt seem like water it had a distinct smell. idk

[C-Kwik]

If its oil that is smoking, it will smell somewhat noxious. Coolant tends to smell a lot like coolant and if you are close enough to it, it will feel humid. Fuel smells like fuel.

Oil can smoke a white color. I'm not entirely sure when it does this, but both times I had a turbo seal failure, I got white smoke. My speculation is that it occurs in cases where the oil is heated to the point of evaporation but not burned. I'm fairly certain oil only leaked passed the tubrine housing seals as I found no indication that there was any oil being forced through the intake.

The reason it only happens when idling, is because of the pressure differential across the seal. At idle, there is going to be very little pressure in the exhaust. The higher pressure in the center-housing will allow oil to move past the seal if it is partially sealing. Under boost, the exhaust manifold will be at higher pressures and will either provide an equal force against the oil pressure, be higher than the oil pressure or only allow a very small amount of oil to leak passed the seals. Depends on how bad the seals are and what kind of pressures are seen on both sides of it.

In my case, I was able to prevent it from smoking by leaving the A/C on. The higher RPM's actually prevented it for me. Each person's situation will vary depending on how bad the seal failure might be, the oil and exhaust flow rates. Assuming it is indeed a turbo seal failure, fixing that would be the only sure solution.

[RideNslidE]

wow very insightful. that sounds like the only likely cause. guess ill roll with it until i can save enough to go big... i.e, t3/t04e + built .

thanks for your help