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Rb25 Intake Manafold

7yphon

By 7yphon,
in Engines & Forced Induction

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infamous_t Veteran

infamous_t

Posted
Posted
Been looking into it for a while now but cant seem to find much info

Is it worth putting on a RB26 Intake man on a 25 and can it be done???

IF so who has done this and how much will I be looking at?

IMHO it would only be worth it if your going to keep the ITBs, otherwise get one designed for the RB25.

Check this recent thread out on the subject... http://www.skylinesaustralia.com/forums/Rb...ap-t208070.html

ISL33P Proficient

ISL33P

Posted
Posted
The stock RB25 manifold will support 500hp.Only get a Greddy one if you are chasing every KW.

i was waiting for that one.

standard plenum will support 2000hp...............if you stick enough boost into it.

the change of intake manifold/plenum is to improve on the poor properties of a standard plenum...therefore doing a better job of what the existing one on there is currently doing. if the new plenum is doing its job the benefits are increased power and torque everywhere.

effeciency is the key...its not what you do (because its more than likely been done before) but how you do it which makes it impressive :cheers:

Ariel

Cjmartz2k Proficient

Cjmartz2k

Posted
Posted
i was waiting for that one.

standard plenum will support 2000hp...............if you stick enough boost into it.

the change of intake manifold/plenum is to improve on the poor properties of a standard plenum...therefore doing a better job of what the existing one on there is currently doing. if the new plenum is doing its job the benefits are increased power and torque everywhere.

effeciency is the key...its not what you do (because its more than likely been done before) but how you do it which makes it impressive :D

Ariel

Well than, put it this way. The stock intake manifold is not very inefficient up to 500hp. I switched mine, along with cams and more boost, and I'm only making about 30-40hp more.

NYTSKY Grand Master

NYTSKY

Posted
Posted
Well than, put it this way. The stock intake manifold is not very inefficient up to 500hp. I switched mine, along with cams and more boost, and I'm only making about 30-40hp more.

30-40hp with cams and more boost? Something a miss there.

l0WRB Mentor

l0WRB

Posted
Posted

I bolted a greddy copy plenum on, best upgrade i ever done.. cheap too...helps with intake temps, throttle response is unreal and the mid range and top end is good and most of all ya engine bay looks how a engine bay should look nice and tidy.

H@ME Mentor

H@ME

Posted
Posted

there is alot of controversy surronding this copy item however i am willing to give it a go. Just wondering what most people did with the location of their bov?? did u have to have another pipe made up etc?? someone pm me the answer (if needs to be made up who is brisbane would be good for it) also would you be able to use some of the old style hybrid piping?? Hame

DRD-00F Grand Master

DRD-00F

Posted
Posted
I bolted a greddy copy plenum on, best upgrade i ever done.. cheap too...helps with intake temps, throttle response is unreal and the mid range and top end is good and most of all ya engine bay looks how a engine bay should look nice and tidy.

that's about every possible reason you would ever have to change it...

The center feed style that the OEM plenum uses is actually a lot better for sharing PSI evenly to every cylinder, where unless you run some extra boost, larger plenums such as those from Plazmaman, can sometimes cause a bit of starvation... again this only really matters if you are chasing every last KW...

All the other reasons though are valid... Keeps inlet temp down cause the piping doesn't run straight back over the fan on the radiator, OR the block... Increases throttle response due to shorter piping... looks a SHIT TONNE better... all good reasons :)

l0WRB Mentor

l0WRB

Posted
Posted
there is alot of controversy surronding this copy item however i am willing to give it a go. Just wondering what most people did with the location of their bov?? did u have to have another pipe made up etc?? someone pm me the answer (if needs to be made up who is brisbane would be good for it) also would you be able to use some of the old style hybrid piping?? Hame

I had a GKtech intercooler kit with your normal style intercooler piping going between fan shroud etc..

i re used it, had to cut up one 90 degree bend and re used a bit of black 90 degree silicon i had from the stock cooler and it all bolted up sweet as.. mind u i took out my washer bottle, still yet to re mount a smaller one...

H@ME Mentor

H@ME

Posted
Posted

with mine i have the GTR style piping that comes out of the side wall which allows the washer bottle to stay in place (although think i will replace soon with alloy one etc..) i suppose when i go to do it i'll find out, i just need to have the bov welded onto the cooler pipe coming out of cooler. (any suggestings where in brisbane??) I doing up my plenum now. will show pics when it is finished:D cheers hame

ISL33P Proficient

ISL33P

Posted
Posted
Well than, put it this way. The stock intake manifold is not very inefficient up to 500hp. I switched mine, along with cams and more boost, and I'm only making about 30-40hp more.

i think its time to change tuner/mechanic or who ever recommended the combination because there is certainly something not right there.

drdoof - how do you know that ? do a search of my posts and you will find some flow test figures of the standard plenum, note 28" is approx 1psi of pressure, and you will soon see how the standard one distributes air.

Ariel

Cjmartz2k Proficient

Cjmartz2k

Posted
Posted
30-40hp with cams and more boost? Something a miss there.

Yeah, the exhaust side of my hybrid dodge cummins/yellow bus turbo is choking the shit out of my motor. I need a bigger exh side. I already have the turbine housing, I just need a HX40 wheel. My pressure ratio's in the exh manifold must be through the roof.

DRD-00F Grand Master

DRD-00F

Posted
Posted
i think its time to change tuner/mechanic or who ever recommended the combination because there is certainly something not right there.

drdoof - how do you know that ? do a search of my posts and you will find some flow test figures of the standard plenum, note 28" is approx 1psi of pressure, and you will soon see how the standard one distributes air.

Ariel

To be honest, mostly hearsay and guess work... You coulda provided a link to your work :) I will go searching...

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