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Plenum Modification

sky017

By sky017,
in Engines & Forced Induction

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sky017 Proficient

sky017

Posted
Posted

hey guys , after doing a bit of extensive reading lately on the forums about the rb25 neo engine and the thought of installing an aftermarket plenum , iv come to the idea of having the standard plenum modified to face forward . i was wondering what everyones opinions of this are ? as iv been reading there is a fair bit of modification needed , ie : custom aac valve plate , different 0 rings , a fair bit of movement as far as hoses go etc , TCS is in the way - would this be easy to remove without effecting anything ?. also on top of all this i had read one member stated that even with all this done , the car didnt run any good and he ended up returning it back to the standard setup.

now in saying this does anyone body know of , or recommend anybody in sydney to perform this?

will the car run accordingly if this modification is carried out correctly?

and finally what would this cost if anyone else has had this done?

any info would be greatly appreciated

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https://www.sau.com.au/forums/topic/360594-plenum-modification/
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XRATED Veteran

XRATED

Posted
Posted

Oh my...

What are you trying to achieve?

- Performance...? I can't see a performance gain. Infact all I can see is poor flow distrobution???

- Looks...? Looks waaay to ghetto fab to me, but I guys that's personal taste???

- Shorter pipe work..? well yes... but at what cost? I'll also add- I will garantee you would not be able to tell the differnence from driving the car on a back to back test!

Not to mention there are so many fantastic options for forward facing plennums- WHY BOTHER?

Cheers

Justin

sky017 Proficient

sky017

Posted
  • Author
Posted

thanks for your reply

i know in general there isnt any hp gain with this mod as iv read over and over , mainly just throttle responce. at the end of the day itd be good to have an engine without the cross over arm , thus making the car much neater and more easier to get around when working on it. shorter pipe work will be beneficial , besides i dont really want that huge amount of pipe running around over the fan and down to the intercooler like most cheap intercooler kits.

my main question of doing this was , if no body recons you get any more hp out of it , why bother buying somethng over $800+ to cut out 1 meter of pipe , i mean thats all it does , maybe increase flow ? no one ever notes how much more powerful their car has become of it ?

zoidbergmerc Mentor

zoidbergmerc

Posted
Posted

I wouldn't bother unless you're going to go whole hog either like I did so you've got a bigger area in the plenum and\or getting a bigger throttle body. It might be worth while if you got a bigger throttle body, or get two throttle bodies!

205536_1673009067913_1318014972_31385937_6989746_n.jpg

PM-R33 Grand Master

PM-R33

Posted
Posted

People used to do that plenum modification years ago when there were bugger all upgrade options for the RB25DET and Neo.

Nowadays there is absolutely no need to go down that route.

I love my Plazmaman plenum and the only thing I would swap it for is a Hypertune plenum (but they don't do them for RB25's off the shelf).

XRATED Veteran

XRATED

Posted
Posted

I wouldn't bother unless you're going to go whole hog either like I did so you've got a bigger area in the plenum and\or getting a bigger throttle body. It might be worth while if you got a bigger throttle body, or get two throttle bodies!

205536_1673009067913_1318014972_31385937_6989746_n.jpg

Ha ha... I kinda like it. Any more pictures?

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