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rb26 air chamber replacement


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Hi Everyone,

Just another case of me getting bored and replacing parts that don't need to be replaced.... this time it's the air chamber or whatever you want to call it from under the rb26 plenum.

this thing..


why? Well i no longer have a clutch booster or the factory boost solenoid on my gtr so just had many of the lines plugged up, I also will be getting rid of the stock cold start valve which attaches to this and hopefully removing some (even more if going single turbo) of the 454397 lines that run under the plenum and make everything a pain to work on. It also serves as a great place to add ports for my MAP sensor and boost gauge without it looking horrible and tee'd into other lines or drilling into the balance tube above the injectors.

so what i have come up with;


which i have 3D printed


and all bolted in place with the idle control valve




I will end up getting it cnc'ed in once i am happy with the design and port sizes for everything are sorted... but may run a plastic piece originally just to make sure there are no reverberation issues.

It will plumb to the 2 factory sources from the balance tube and as you can see bolts to the factory location, the plan being it's only a single custom piece and plays nice with the rest of the factory parts instead of having to change everything around it (other than new lines which will have to be made to suit).


let me know what you think, 





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Yeh it would be just to make sure there are no tuning issues... I’m sure Nissan designed it the way they did for a reason just hoping it wasn’t because it creates issues with less volume!

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