Jump to content
SAU Community

TURBO COMPRESSOR OUTLET

NCred02
 Share

Recommended Posts

NCred02 Contributor

NCred02

Posted
Posted

Does anyone know if the RB20 and RB25 are the same? MyRB20 pipe is just a bit smaller than the turbo out let. Bolts dont line up and opening is different size.

My turbo is "direct fit" aftermarket and theres been a few snags.

Any ideas on how to get this done or where to find one would be appreciated.

Can I bore out the old one? widen the hole spread? 

20211202_185937.jpg

20211202_192631.jpg

Link to comment
https://www.sau.com.au/forums/topic/483058-turbo-compressor-outlet/
Share on other sites
NCred02 Contributor

NCred02

Posted
  • Author
Posted
On 12/3/2021 at 9:33 PM, TurboTapin said:

RB20 and RB25 turbo inlets are not interchangeable. I've never heard of someone modifying one to fit but everything is possible. 

So if I understand. A RB20 turbo compressor outlet and a RB25 are not the same size?

Excuse my lack of knowledge. never had a turbo and my first Japanese vehicle as well. I have searched for outlet specs and cant find any information on bolt pattern or spacing    

TurboTapin Proficient

TurboTapin

Posted
Posted (edited)
On 12/4/2021 at 5:08 AM, NCred02 said:

So if I understand. A RB20 turbo compressor outlet and a RB25 are not the same size?

Excuse my lack of knowledge. never had a turbo and my first Japanese vehicle as well. I have searched for outlet specs and cant find any information on bolt pattern or spacing    

Correct, they are not the same. An RB20 compressor outlet does not bolt onto an RB25 turbo. 

Edited by TurboTapin
TurboTapin Proficient

TurboTapin

Posted
Posted (edited)

See this thread. It explains it perfectly. 

Exhaust Mainfold | Skyline Owners Forum

 

Picture of RB25 elbow gasket on RB20 turbo elbow for comparison. Both the size and flange are different. As @GTSBoy has already mentioned though, it can be made to fit. I would just open up the flange with a die grinder and drill out the bolt holes so they match up. 

1323200403_DSCF4190(1).thumb.jpg.7961dac9906d772945a143f2128aa5bf.jpg

 

 

Edited by TurboTapin

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

    • r33.antwone
      RB26dett R33 gtst swap

      By r33.antwone · Posted

      hello wanted some insight on what my problem could be so i swapped a RB26DETT into my r33 gtst used a R33 GTR engine harness and im using a haltech platinum pro. The car cranks but no start the ecu isn’t getting any power now im trying to find out why i cant seem to find any schematics  or diagram for the engine harness for the r33 gtr anything helps thank you.
    • DraftySquash
      Looking for someone with a R34 front bar

      By DraftySquash · Posted

      hahahaa @GTSBoy that is my last resort. Like use a cardboard and cut it using the indicator as a reference. But I was winging my luck to see anyone had a spare bumper because drawing the outline off the hole is always easier and less chance of mucking it up
    • Borci88
      Borg Warner EFR Series Turbo's V 2.0

      By Borci88 · Posted

      Admittedly in that screenshot its doing about 13psi but later on in the log theres definitely spikes to 16. What is missing though is the massive peak, then a big drop and then a recovery. While it does go a little higher than I would like on base pressure, I think it's reasonably safe to assume that boost control via the mac valve should be a lot easier to control from here on out. I wasn't game to hook up the mac valve today as it's very wet and it's on the verge of fighting traction as it is.
    • GTSBoy
      Borg Warner EFR Series Turbo's V 2.0

      By GTSBoy · Posted

      I think this is still wrong. There is something crappy with wastegate priority (or the f**king absence of it) if you can't get below nearly double the base spring pressure. But if you're happy with what you've got, upload skid vids now.
    • Borci88
      Borg Warner EFR Series Turbo's V 2.0

      By Borci88 · Posted

      So a further update for this one. Turbosmart were very gracious and took one look at the wastegate and said this is our original version, we will just replace the entire thing and send it back to you. So I fitted the new wastegate with its new revisions and took it around the block on spring pressure (9 psi spring). Appears the minimum it will do is about 16psi. Keep in mind this is only 2nd and 3rd gear pulls. I think the issue is fixed compared to what it was doing before however I'm happy to provide more logs if anyone thinks theres more to the story to uncover
×
×
  • Create New...