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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

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

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

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.??? 

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。

  • 2 weeks later...

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 :P

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