Jump to content
SAU Community

1995 R33 Gtr Oil In Intake Pipe

judasentinel

By judasentinel,
in Engines & Forced Induction

 Share

Recommended Posts

judasentinel Explorer

judasentinel

Posted
Posted

I have a 1995 R33 GTR, and have been noticing oil coming into the intake pipe between the rear MAF and the rear turbo.

Someone suggested it could be from the exhaust crankcase ventilation (PCV) connected to the rear intake pipe, so I installed a catch can between the pCV and the rear turbo. However, the oil is still showing up in the rear MAF intake hose. I see oil coated on the turbo side of the MAF.

I have twin BOVs recirculating back to the Y pipe between the turbos, and when I rev the engine, I can see the air coming back out of the rear MAF (and not the front). The front MAF and turbo intake pipe are clean, which makes me think that the oil might be coming in from the rear turbo. This theory however, seems to suggest that the rear turbo may be leaking and blown.

However, the car boosts fine, all the way up to 1 bar without any hesitation. If the rear turbo was blown or had issues, would the car still boost? There is no oil leak under the car, and no black or blue smoke coming out of the exhaust. It idles fine as well.

I am totally stumped. I dont want to push the car if the rear turbo is blown, because some people have suggested it might be, but then others say that if it were, I wouldnt be able to boost the car to 1 bar.

Any ideas or suggestions to check?

Please help me as I want to make sure that the car is fine.

Thank you,

Munib

Link to comment
https://www.sau.com.au/forums/topic/459082-1995-r33-gtr-oil-in-intake-pipe/
Share on other sites
djr81 Grand Master

djr81

Posted
Posted

The blowby that gets sucked out of the head by the turbo (As opposed to the drivers side which goes into the engine on over run) goes to the rear turbo. This is almost certainly what you are seeing. Usually it ends up dripping out of the bovs. Even the crack pipe priced Nismo catch can doesn't stop it from happening.

judasentinel Explorer

judasentinel

Posted
  • Author
Posted

So how does one discern if it is the blow-by oil or the turbo is shot/leaking oil from the compressor side? If there is a compressor oil seal leak, will it also go into the intake piping? If so, how do we determine what is actually happening without removing the turbo piping?

Also, if there is an exhaust oil seal leak, will that also cause the oil to come up front of the turbo towards the compressor and go into the intake piping?

Surely, there would be a way to identify if the oil is from the blow-by or the turbo oil seal leak....?

judasentinel Explorer

judasentinel

Posted
  • Author
Posted

In addition to this, I do not see any oil at all in the catch can....maybe a tiny droplet, but that's all. And while the car is running OR I am revving the engine, I do not detect any suction from the catch can into the hose I am running to the rear turbo-MAF intake pipe. If this means the turbo is not spinning, it wont be sucking in any air from that hose, could this also be causing the recirc from the BOV to come out of the rear MAF? When I let go of the accelerator, I can see air/oil blow out of the rear MAF filter. This has me perplexed.

judasentinel Explorer

judasentinel

Posted
  • Author
Posted

If it is just blow-by coming back from the BOVs, and oil is returning with it, why is it escaping though the rear MAF only, and out the rear filter, and getting sucked in by the turbo since the whole point of recirc is to keep the metered air within the intake system?

I dont know if what I am saying makes sense....the BOVs recirculate air, it comes back into the MAF-turbo pipes (through the Y-pipe that connects to both turbos), and ideally, should at stage be sucked back in by the turbos. Instead, it is escaping out of the rear MAF...

fatz Grand Master

fatz

Posted
Posted

If it is just blow-by coming back from the BOVs, and oil is returning with it, why is it escaping though the rear MAF only, and out the rear filter, and getting sucked in by the turbo since the whole point of recirc is to keep the metered air within the intake system?

I dont know if what I am saying makes sense....the BOVs recirculate air, it comes back into the MAF-turbo pipes (through the Y-pipe that connects to both turbos), and ideally, should at stage be sucked back in by the turbos. Instead, it is escaping out of the rear MAF...

That is just because of the stock setup it takes the easy way out

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • JoVo
      Auto Electrician Workshop Recommendation for Reverse Camera Not Working CKV36 (SYD or WOL)

      By JoVo · Posted

      Update: Tunehouse looked into the problem and identified a wiring issue between the camera unit and the connector. They managed to get it working , but did warn me at some point it will stop working again. From their perspective it is unserviceable and will need replacement. They did some research and found that the new replacement camera would be Approx $1400 supply only (their fitting cost would be $190) . They did provide the part number (28442-JL05B) and a quick google of the part number shows that these are rather expensive brand new (seemingly no longer in manufacture) for the places that still have them in stock, with the used option potentially presenting  the same issue down the track at some unknown point. They are happy for me to supply the part so that they can fit it. Decisions, decisions... I can definitely recommend Tunehouse (thankyou Vee37!). Cost for the diagnosis was as quoted  ($190) , car was ready on time and communication was top notch. Their workshop is super clean and modern, and there was plenty of car candy parked out the front on the day I went.   Would definitely go back.   
    • r32-25t
      R32 Gtr Long Term Love, Now Project

      By r32-25t · Posted

      to fix the voltage drop issue I swapped out the old 150amp alternator which turns out is a brand known for having issues and replaced it with the black 180amp alternator beside it 
    • S1_C34
      A31 Digital Climate Control

      By S1_C34 · Posted

      For anyone interested, the Way Back Machine has that Japanese website archived with pictures, etc: https://web.archive.org/web/20051023225805fw_/http://www.a31cefiro.com/air_con.htm "Simply swapping the wiring of the harness will not allow it to function properly. For the outdoor air sensor and sunlight sensor, disconnect the wiring connected to CN1-11 of the air conditioning harness from the harness and connect the sensor side wiring to earth. For the indoor air sensor, disconnect the wiring connected to CN2-3 of the air conditioning harness from the harness and connect the sensor side wiring to earth. The connector PIN numbers listed here are the genuine A31 PIN numbers. To avoid incorrect wiring, check with a tester before wiring. Also, disconnect the wiring in a location close to the sensor. The disconnected harness side wiring will not be used, so be sure to insulate it." Wish someone sold a conversion harness to just plug-and-play a Kouki 180sx digital climate control into C33/A31. I'm decent with wiring but feeling kinda lazy about taking this on. Edit: Did some more digging and found a helpful Minkara blog post about the conversion as well: https://minkara.carview.co.jp/userid/1831116/car/1360568/2284209/note.aspx "After installation is complete or the battery is replaced, you need to go into self-diagnosis mode and set the internal air recirculation. The way to do it is to "hold OFF with the key on for more than 5 seconds, set the number to 5, then press 卍→C." ↑↑↑It probably won't make sense unless you actually try it (・∀・)." Lol wtf
    • MBS206
      Skid pans in/around Sydney?

      By MBS206 · Posted

      Maybe SAUNSW could see howany members would do a motorkhana day if Schofield's is still available for a reasonable price...
    • MBS206
      Skid pans in/around Sydney?

      By MBS206 · Posted

      Skip the concrete, we just need to smooth a field. Mark knows how to drive a grader Duncan   I reckon 100x100 flat area for skid pan style, and then some sort tracks for rally... Duncan's already got a rally car on the premises to...
×
×
  • Create New...