Jump to content
SAU Community

Turbo Problem And Question!

boliztik
 Share

Recommended Posts

boliztik Enthusiast

boliztik

Posted
Posted

hey,i have a 32 gtst with an rb25, every time i slow down from boost i get white smoke that puffs out from the exhaust (fair bit)

none on idle or anything only slowing down. from what i know its probly a blown oil seal on the turbo... correct? if so whats a rough price for new seals with labour?

engine specs: standard rb25 turbo running 10 psi, 3 inch no cat, microtec, ebc, 040 fuely etc

also i have a brand new garrett t04 sitting around, would it be better to fit this? i have boch 040 fuel pump but standurd injectors, once again would like a rough price from ur experiance.

sorry to ramble on...

cheers dylan

Link to comment
https://www.sau.com.au/forums/topic/217573-turbo-problem-and-question/
Share on other sites
The Dan Grand Master

The Dan

Posted
Posted

Don't discount valve stem seals. You need to perform tests to determine which is the cause of your problem.

Remove the turbo and manifold and do a vacuum test on the exhaust ports to determine the condition of the valve stem seals. If they come up ok, then you need to examine the turbo.

I'm not about to go into depth into how you should do this as you won't even have the tools or equipment to test the valve stem seals anyway.

Good luck

The Dan Grand Master

The Dan

Posted
Posted

sorry mate, it's a harsh reality. Valve stem seals are more likely to leak at negative cylinder pressure as the vacuum effect draws oil through the stem seals. They can weap at idle also but it slowly gets burnt away and not so noticable. On decel, the cylinder draws oil past the stem seal and because you have no real combustion until you resume accel, it will become quite noticeable at this point.

Could still be your turbo but would hate to see you replace it and have the same problem without checking it properly first.

tridentt150v Grand Master

tridentt150v

Posted
Posted

3lit3 is correct, but decel will vacuum suck oil in from a few places, even up past the oil control rings in the bore [although rings usually also smoke after an idle period then accel].

I think you need to determine if the white smoke is oil or water/coolant as well, this could help you determine where to look.

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

    • jacobzking
      Pipe from Greddy FMIC to Greddy intake manifold (RB25)?

      By jacobzking · Posted

      Does anyone sell a pipe that's made to go from the Greddy FMIC kit for ECR33 (RB25DET) to the Greddy intake manifold? 
    • niZmO_Man
      Borg Warner EFR Series Turbo's V 2.0

      By niZmO_Man · Posted

      Not that I know from experience, but in theory you'd want your gate spring to be as close to target pressure as possible, so you'd go with the higher gate spring?
    • Borci88
      Borg Warner EFR Series Turbo's V 2.0

      By Borci88 · Posted

      Before I commit to it as I already have the wastegate off the car, would you change it to the 9psi spring instead of the 12, or whack it back on now and try your suggestion?   Edit: Actually I might just swap the spring and see what the logs say after another few pulls, as we know it's still spiking without the Mac valve in the picture so I need more data without the Mac valve trying to combat the issue.
    • Murray_Calavera
      Steps to DIY sanding car back ready for respray....

      By Murray_Calavera · Posted

      Sounds good Hmm suppose the main thing is, how much do you care about this car? The filler doesn't make for a very good water barrier lol. If there was a tiny little bit of rust forming now, that in 3 to 5 years time becomes obvious under the paint (starts to bubble up), would it bother you? 
    • Kinkstaah
      Mistakes were made, my R34 Story

      By Kinkstaah · Posted

      I already have the ability to datalog the voltage... what I can't do is correlate it to what the gauge is showing when I'm looking at the data at a later date. Or something like this. Except getting the oil to 125C+ involves me going 200+kmh at the track so you can imagine this is a little tricky unless I do something like note what the voltage is when I am at the top of 5th gear so I have a point to reference on. Drove car today. O2 still reading richer because hopefully not a leak instead of massive restriction I've introduced. Car really doesn't sound like a LS. It's quite strange. Pulled a bit of fuel out up top. This does potentially explain why my spark plugs looked like the car was running pretty over-rich. If I was tuning it to a ~12.7 which in reality was far richer than that in the past. It will be handy to have the dyno WB to compare my WB to to compare notes that's for sure. At this point I'm happy to just sit in the passenger seat and tune the thing given I've got about 7 million hours on the platform lol.
×
×
  • Create New...