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TURBO COMPRESSOR OUTLET

NCred02
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NCred02 Contributor

NCred02

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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

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NCred02 Contributor

NCred02

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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

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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

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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

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