Ol in the turbo
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From: OC
Ol in the turbo
My first turbo was not spooling up. It was probably only delivering 5 lbs of boost. The shop took them apart today and said there was oil in the turbo and it couldn't spool up due to the added weight maybe. Anyway they are recommending a rebuild. My question is (1) does this sound right (2) I want to keep this car smog legal in CA so what is best compromise for performance and legality? BNR, M2, stock turbo rebuild (their recommendation) etc.
Joined: Oct 2001
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From: My 350Z Roadster kicks my RX7's butt
You should ask ArtGuy, since he has gone through what four sets of tiwns I beleive here in Disneylandville.
At the $3k range there is M2 and JDM twins. At the $1500 range and below, you have BNR, Pettit and maybe Rotary Reliability.
At the $3k range there is M2 and JDM twins. At the $1500 range and below, you have BNR, Pettit and maybe Rotary Reliability.
don't race, don't need to
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From: Tri-Cities, WA
WTF?? Oil slowing down the spool up in turbo? Oil is heavier than the exhaust charge driving the turbo? Ummm...
Was the primary COMPLETELY not spooling up, i.e. frozen? Then you were getting 0 psi boost! Low boost condition at 5 psi is more likely due to a leaking ANYTHING/EVERYTHING downstream from the turbos. The rubber interconnect between the y-pipe and the crossover pipe being ols and cracked (you can't see this unless you TAKE THE HOSE OFF and bend it to look for cracks)? The intercooler pipes? the elbow leaking?
Oil in the primary turbo is EXPECTED in our car. When we boost, we place positive pressure into the combustion chamber, whch blows by the oil seals (thus the nomer "blow-by"). If the intake manifold were under vacuum at this point, the blow by would be sucked into the intake manifold through the PCV (positive crankase valve) valve. BUT, this is a one way valve. So under positive manifold pressure (boost!), the blow by gasses close the PCV valve, but must go somewhere, right? Yes, in one of the hoses in the little elbow you see right in front of the primary turbo. Ohhh..
Ask the shop for a better explanation. Even if you SOAKED the primary turbines in oil, I can't see this interfering with boost... but then what the hell do I know??
Was the primary COMPLETELY not spooling up, i.e. frozen? Then you were getting 0 psi boost! Low boost condition at 5 psi is more likely due to a leaking ANYTHING/EVERYTHING downstream from the turbos. The rubber interconnect between the y-pipe and the crossover pipe being ols and cracked (you can't see this unless you TAKE THE HOSE OFF and bend it to look for cracks)? The intercooler pipes? the elbow leaking?
Oil in the primary turbo is EXPECTED in our car. When we boost, we place positive pressure into the combustion chamber, whch blows by the oil seals (thus the nomer "blow-by"). If the intake manifold were under vacuum at this point, the blow by would be sucked into the intake manifold through the PCV (positive crankase valve) valve. BUT, this is a one way valve. So under positive manifold pressure (boost!), the blow by gasses close the PCV valve, but must go somewhere, right? Yes, in one of the hoses in the little elbow you see right in front of the primary turbo. Ohhh..
Ask the shop for a better explanation. Even if you SOAKED the primary turbines in oil, I can't see this interfering with boost... but then what the hell do I know??
Last edited by spurvo; Nov 15, 2002 at 02:06 AM.
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From: OC
Yes, it was more like a low boost situation. I do not have a boost gauge but I would say it was making the minimum 5 lbs of boost. I kind of think a leak or leaks is more likely. (Especially since I just had all the vacuum lines replaced and a new air intake system installed and BOV. At the same time they said three or four of the solenoids were bad---broken----(yea uhuh) and needed to be replaced).
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