Rb26 Plenum On And Rb20

[Shypo]

The other day i was thinking about how stupid the route is that the intercooler piping takes on my RB20 with that big elongated U bend coming from the plenum so it got me to thinking if an RB26 plenum with its more logical plenum design would fit on the RB20?

Anyone tried this?

[CEF11E]

will not fit... 6 throttle bodies, different mounting pattern, need different fuel rail. need different ECU to cope with 6 tbs....

Edited January 29, 2006 by CEF11E

[fEkuaR]

isnt there an adapter plate you can get? but it was determined that the head ports on the rb20/25 dont match the plennum intake angle?

Edited January 29, 2006 by fEkuaR

[Dobz]

it is possible to cut the rb20 runners short and weld brackets on so the gtr manifold will bolt on.

its allready proven that you lose a lot of top end power with the gtr manifold with the only improvment being better bottom end power

theres no point having an rb if its losing power when your bouncing off the limiter

[Roy]

will not fit... 6 throttle bodies, different mounting pattern, need different fuel rail. need different ECU to cope with 6 tbs....

<{POST_SNAPBACK}>

Why do you need a different fuel rail and ECU? A bit of machined billet used as an adaptor/sandwich plate will do the trick.???

It can be done, but the question is are you sure there will be any benefit. Zoom magazine did a similar thing a couple of years ago to an RB20 with a HkS 2535 and it generally lost them power.

I suppose it has to do with displacement/flow differences between the two engines

[osiris23]

i was actually going to ask about this for an Rb25 the other day but thought about it and realised it musnt because why wouldnt you see it more often...

[Maxx]

Why do you need a different fuel rail and ECU? A bit of machined billet used as an adaptor/sandwich plate will do the trick.??? 

<{POST_SNAPBACK}>

don't ask me why but Ricoh racing said u need ECU

http://www.ricohracing.com/ricoh-home/rico...n/rb25_6ren.htm

● ＣＰＵのデータ書き換えが必要です。

[RACESPEC]

Blitz

Actually have an adaptor from the RB25 to the RB26 Plenum, retaining the 6 thorttle bodies aswell

Cheers

Tarek

RACESPEC

[Deli Rep]

I have an RB25DE non vct motor that has been de-compped and freshened up for my R32.

They run the same top feed injector setup as RB20, same loom and my ecu will even run it fine... it's essentially just a 2.5lt RB20....

The crossover on the 20's and 25's has always sh!t me mainly from a cooler piping point of view and I want to look into other options...

I too have heard of one of the jap brands (prob blitz) making an adapter kit to use gtr plenum... surely such a kit would mean everything lining up and bolting straight on, The injectors etc should not be an issue as it still runs top feed like gtr?

Does anyone know more about these or used them on a 20 or 25 non vct like mine?

I have searched the forums but it mainly just 25DET stuff being talked about and it's all too hard... but it shouldn't be for my set up

[Craved]

think the blitz adapter is about $1200 itself, plus the cost of the plenum ...

this is usually the only option for NEO RB25's since there is no aftermarket plenums for them yet