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R32 Rb20 Aftermarker Front Facing Plenums?

G Kanobi

By G Kanobi,
in Engines & Forced Induction

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G Kanobi Enthusiast

G Kanobi

Posted
Posted

I've had a good search around the forums for this and havent specificly found thse answer I'm looking for.

I have a 32 gts-t rb20, and a 32 gtr cooler sitting spare.

A decent piping job to hook up to the standard inlet manifold by the look of it.

I'm thinking if there's a cheap enough front facing plenum for the RB20, would it almost be as cost effective to install that when i get my remap, and running a straight pipe up to it from the GTR cooler? POSSIBLY, although very unlikely, even using the GTR pipe for that section, and maybe getting away with a minor modification to it?

Has anyone looked into doing this? Or has something similar?

Also, can anyone steer me in the direction of a front facing rb20 plenum? I found one for around $1k, but can't justify spending that as I'm a student.

Any help or general advice would be great.

Cheers guys

cogs Experienced

cogs

Posted
Posted

Unless I've misinterpreted your post (which is possible as its quite late and I'm tired), no half decent front facing plenum is going to be cheaper than getting piping to the standard inlet plenum.

probably looking at around $200 for a piping kit from ebay. other option is to try and track down some used cooler piping to suit a R32 gtst.

A front facing plenum is going to be much much more than $200 (unless its a stocko cut & shut job or something) and then you still have to get piping for it anyway.

So IMO stick with the stock inlet and get FMIC piping kit.

PS.. How much did the GTR cooler set you back if you dont mind me asking? I smashed mine and thinking of getting a 32 GTR one to replace it.

limpus Mentor

limpus

Posted
Posted
Front facing plenums i have seen go for $600 to $1000 for good ones.

But i have heard its not worth it unless your after a lot of power.

Its hard to say though...how long is a piece of string...when does it become worthwhile?

I too think theres heaps of other stuff to concentrate on first but the shortened cooler piping is a big plus to me...

esky_mad Proficient

esky_mad

Posted
Posted

rb20's dont benefit very much at all from front facing plenums. if your doing if for the pure astheitcs, then maybe its worth it its up to you if you want to spend the money on a decent one, your unlikely to come across any second hand good quality plenums for the 20, and i would advise you not to go for a cut and shut jobby, it looks shit and theres a good chance you'll start leaning the motor out (some people swear by them while majority wouldnt touch them)

ive got a custom top half thats welded to the original runners (RB20 , i only got it because it was cheap, and i didnt want piping running everywhere, highmount etc.)

you could mess around with the GTR core or just get a cheap chinese kit that'll flow just as much as that old GTR core.

dont mean to criticise but it doesnt sound like your after much power so money spend on that plenum could go to a fuel pump or oil cooler, something thats going to make an actual contribution to the motor.

my 2c.

GTR-32U Mentor

GTR-32U

Posted
Posted

wouldnt going for a front facing plenum greatly improve boost response ? As there is maybe a metre of intercooler piping eliminated assuming you would have went the pipe across the radiator layout which seems most common. I would think that max power wouldnt improve at all however drivability should be noticably improved...

nizmonut Community Regular

nizmonut

Posted
Posted

front facing plenum on a rb20 wont benefit the motor, you better off spending

180 on a wasted spark ignition system

70 on a good oil cooler

some adjustable cam gears

up and over intercooler kit with a good size front mount

this will benefit your gtst better then any front facing plenum

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