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Rb25 Forward Facing Plenum/what Rwkw Is It Needed?

HARDCORE
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HARDCORE Contributor

HARDCORE

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hey whats up,Im just waiting on a new turbo for my skyline,with the old one it was making 300rwkw but im chasin more bout 330-350,and cant work out if i really need a forward plenum or not,im running a power f.c with atmo bov so if i really need it its i bit of a pain in the ass,coz ill have to get a oil fiter relocation kit and re-weld a new flange for the bov.also it will be alot closer to the afm,its not to bad at the moment but its pretty close to the throtle body so stalling isnt that bad unless you back of qik at low rpm,any way what im needing to find out is who is making this sort of power with the factory plenum?? Im sure its possible just wanting some other opinions and also wanting to get everything sorted befor she goes on the dyno...

cheerz Jim.

eeiko321 Experienced

eeiko321

Posted
Posted
hey whats up,Im just waiting on a new turbo for my skyline,with the old one it was making 300rwkw but im chasin more bout 330-350,and cant work out if i really need a forward plenum or not,im running a power f.c with atmo bov so if i really need it its i bit of a pain in the ass,coz ill have to get a oil fiter relocation kit and re-weld a new flange for the bov.also it will be alot closer to the afm,its not to bad at the moment but its pretty close to the throtle body so stalling isnt that bad unless you back of qik at low rpm,any way what im needing to find out is who is making this sort of power with the factory plenum?? Im sure its possible just wanting some other opinions and also wanting to get everything sorted befor she goes on the dyno...

cheerz Jim.

what sort of skyline is it?

It is said that the Stock RB25 plenum can handle approx 350RWKW/500Rwhp

Few here have installed an Rb26 plenum rather than the FF Plenum.

HARDCORE Contributor

HARDCORE

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what sort of skyline is it?

It is said that the Stock RB25 plenum can handle approx 350RWKW/500Rwhp

Few here have installed an Rb26 plenum rather than the FF Plenum.

its a r31 gtsx,if i can get 350rwkw il be happy with that,for now any way. :)

PM-R33 Grand Master

PM-R33

Posted
Posted

At the end of the day, the stock plenum will be fine. With a forward facing plenum you will gain a bit more response and a bit more power through out the rev range (depending on plenum of course). It tidies up the engine bay something fierce as the stock plenum setup is a very ugly piece of gear. I did the plenum very early on and it was probably one of the best mods i ever did.

Your call though.

PM-R33 Grand Master

PM-R33

Posted
Posted

Nope, you can either use an adaptor plate which isn't sold new anymore. Or you have to modify the hell out of it. There is a thread in the Forced Induction section about it. It aint a small job.

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