Ok so i got my formula back today and my mechanic played with the vac lines because he dident map out how they were originally. when i got it back the BOV wasent working at all.. I solved that problem and the idle problem.. now the problem I'm having is that I have a ton of smoke pouring out the back of the car when in boost.. were talkin about smoke screen smoke not just a little.. I'll post pics of how my vac line setup is but my mechanic claims i have to much vac pressure making it to the heads.. I'm thinking maybey a simple breather filter might solve this problem.
IP: Logged
03:05 PM
PFF
System Bot
KaijuSenso Member
Posts: 911 From: Westland, MI Registered: Jan 2007
If the BOV wasn't working the pressure built up couldn't release during a shift or drop in throttle and might have blown a seal on the turbo? That would be a bummer but it was just my first thought.
I had this happen once when I accidentally closed off the crank case. Pressure would build up and push oil up through the turbo drain and cause it to smoke.
If the BOV wasn't working the pressure built up couldn't release during a shift or drop in throttle and might have blown a seal on the turbo? That would be a bummer but it was just my first thought.
That wouldent be to bad i guess... just get the darn thing rebuilt i guess... still sucks though.
It was dumping through the wastegate though
[This message has been edited by pontiackid86 (edited 09-13-2011).]
Never heard of crank case pressure blowing turbo seals, especially not the metal turbine shaft seal. Too much crankcase pressure will blow oil past the turbine seal into the exhaust and cause a lot of smoke but that doesn't make it bad.
Have you checked to make sure the crankcase is not being pressurized from a mis routed line directing boost pressure to it?
If the piston rings are damaged you can lessen the smoke effect by removing the oil filler cap to relieve crankcase pressure.
Worn bearings in the turbo can also result in this problem as the bearings serve as a restriction to oil flow. With enough wear the oil can flow past them fast enough to fill up the drain tube and poor out the back of the turbo in some cases.
Originally posted by pontiackid86: my mechanic claims i have to much vac pressure making it to the heads.. I'm thinking maybey a simple breather filter might solve this problem.
That's a new one, good vacuum suggests good pumping efficiency, and unless oil is being sucked out of the center section of the turbo by the compressor (which signals a bad turbo, or inlet restrictions) and blown into the motor, there is no vacuum going on under boost in the engine to support that theory.
Was it smoking when you took it to him?
[This message has been edited by Joseph Upson (edited 09-13-2011).]
That's a new one, good vacuum suggests good pumping efficiency, and unless oil is being sucked out of the center section of the turbo by the compressor (which signals a bad turbo, or inlet restrictions) and blown into the motor, there is no vacuum going on under boost in the engine to support that theory.
Was it smoking when you took it to him?
Since his mechanic couldn't put it back together the way it came apart, I'd be disinclined to take any assessment he made seriously, as he obviously doesn't understand the system.
That's a new one, good vacuum suggests good pumping efficiency, and unless oil is being sucked out of the center section of the turbo by the compressor (which signals a bad turbo, or inlet restrictions) and blown into the motor, there is no vacuum going on under boost in the engine to support that theory.
Was it smoking when you took it to him?
It smoked a little bit before i took it to him but not nearley this much.
start with checking the cold side of the turbo. Open up the intake pipe where it clamps to the tubo outlet, if you find oil in the intake pipe then you've likely blown the turbo oil seal.
start with checking the cold side of the turbo. Open up the intake pipe where it clamps to the tubo outlet, if you find oil in the intake pipe then you've likely blown the turbo oil seal.
He has oil coming out of the wastegate, a little oil on the compressor side shouldn't cause his smoke problem and would probably lead to detonation if it gets to be excessive due to contamination of the intake charge right along with the smoke.
If he removes the oil fill cap and the problem gets better it's very likely his crankcase pressure is too high from blow-by or being pressurized due to an improper line connection or PCV hose connection to the manifold without a PCvalve in place.
He has oil coming out of the wastegate, a little oil on the compressor side shouldn't cause his smoke problem and would probably lead to detonation if it gets to be excessive due to contamination of the intake charge right along with the smoke.
If he removes the oil fill cap and the problem gets better it's very likely his crankcase pressure is too high from blow-by or being pressurized due to an improper line connection or PCV hose connection to the manifold without a PCvalve in place.
Excessive oil from the outlet can cause that much smoke that's why I suggested to start there, it's easy to check. Yes, detonation tendency can increase from oil in the intake charge and yes to the possible PCV problem. Whether the oil is coming from the turbo seal or the PCV line is moot..... it still ends up in the combustion chamber. increased tendency for detonation will indeed be present.
[This message has been edited by Joe 1320 (edited 09-14-2011).]
Originally posted by Joe 1320: Excessive oil from the outlet can cause that much smoke that's why I suggested to start there, it's easy to check. Yes, detonation tendency can increase from oil in the intake charge and yes to the possible PCV problem. Whether the oil is coming from the turbo seal or the PCV line is moot..... it still ends up in the combustion chamber. increased tendency for detonation will indeed be present.
The smoke from combusted oil is usually not nearly as bad as oil burning in the exhaust from my experience. The amount that would have to enter the combustion chamber to produce the kind of smoke screen he's describing would probably choke out the engine fouling the plugs in the process.
He's already stated he has oil coming out of the wastegate so no need to focus on the compressor side as he already has a source to address for the smoke. I just recently took my turbo down and found a spoon full of oil in the compressor housing but the engine wasn't smoking. Oil in the combustion chamber gets cooked onto the pistons and combustion chamber raising the compression ratio.
IP: Logged
04:35 PM
1fatcat Member
Posts: 1519 From: Zimmerman, Mn Registered: Dec 2010
The smoke from combusted oil is usually not nearly as bad as oil burning in the exhaust from my experience. The amount that would have to enter the combustion chamber to produce the kind of smoke screen he's describing would probably choke out the engine fouling the plugs in the process.
I agree. I've seen the smoke screens from oil ingestion into the combustion chamber vs oil induced into the exauhst on turbo cars. The smoke screen being described sounds like oil being induced into the exauhst. On a turbo, the hot side of the turbo gets REAL hot when in boost. It will glow red with a hard run. Any oil induced there will not affect how the engine runs, but will produce very thick clouds of smoke.
Did your mechanic test drive your car, run it hard and then park it with a glowing red hot turbo? That will cook the oil on the sealing ring (usually on the exauhst/hot side) and cause less than effective ring sealing the next time you run it. It may be leaking all the time, but only gets hot enough to burn when your under boost?
I owned a turbo car that did this (because I ran it too hard and shut it off with a red hot turbo) and took the turbo apart to find heavy carbon deposits on the sealing ring on the hot side of the shaft. I cleaned all the carbon deposites off all the components and reassembled, worked great from there on. I never shut it off again with a hot turbo. This is where an EGT guage comes in handy.
I found a fix for it.. I hooked up a sepret breather system that stands alone from the vac system.. havent had any smoke at all now.. thanks guys. I did check the cold side and its dry as can be..
[This message has been edited by pontiackid86 (edited 09-14-2011).]
