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Gtr plenum

Kaido_RR

By Kaido_RR,
in Engines & Forced Induction

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Kaido_RR Grand Master

Kaido_RR

Posted
Posted

hey,

I recently pick myself up a I/C, now im getting around to do the piping sometime this week. now after reading how good the gtr plenum is and seeing one on a neo rb25, i was wondering does anyone know anyone in australia (or perth) that would be able to make up an adoptor plate to suit an r33 rb25?

thanks michael

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HKS34R Collaborator

HKS34R

Posted
Posted
hey,

I recently pick myself up a I/C, now im getting around to do the piping sometime this week. now after reading how good the gtr plenum is and seeing one on a neo rb25, i was wondering does anyone know anyone in australia (or perth) that would be able to make up an adoptor plate to suit an r33 rb25?

thanks michael

Interesting. Was this a standard GTR plenum on the NEO or an aftermarket one (i.e Greddy). Anyone know how hard these would be to fit and whether it would be worth the effort, I mean, outside of making intercooler piping easier. The throttle cable would have to be adapted to suit, but anything else??

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Kaido_RR Grand Master

Kaido_RR

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Brett, the gtr plenum was on an r34 gt-t 4dr (if u watch d1, it is the blitz r34 4dr, driven by Ken Nomura)

i just did abit of seraching and found that a plate or spacer would be needed to be made to fit inbetween the plenum and the rb25 head. i have contact someone in perth which does ic piping and ask him if he could possable do it, i will get back to you once i have got my reply.

also i read that the gtr fuel rail, will fit also pefrectly?

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R324D Community Regular

R324D

Posted
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Anyone know how hard these would be to fit and whether it would be worth the effort

I fealt top end increased but you lose power down low, all in all if I owned another Skyline would I do it again.........No.......

As mentioned run a search on past threads, here is 2, mainly about 32's but 33's are bought up...

http://www.skylinesaustralia.com/forums/sh...ead.php?t=49852

http://www.skylinesaustralia.com/forums/sh...ead.php?t=36518

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Sydneykid Grand Master

Sydneykid

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Brett, it was a stock gtr plenum, i have been told and read many times that the responds that the gtr plenum is second to none

on an RB26, YES with the multiple throttle bodies.

on an RB25, NO...........

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Kaido_RR Grand Master

Kaido_RR

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then Sydneykid, why is it uses on the blitz r34 drift car? and what is the problem putting it on a rb25?

i really would like to know, as i have the chance to buy the plenum very soon and if it isnt going to work well on the rb25 there is no point me getting it

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Sydneykid Grand Master

Sydneykid

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then Sydneykid, why is it uses on the blitz r34 drift car? and what is the problem putting it on a rb25?  

i really would like to know, as i have the chance to buy the plenum very soon and if it isnt going to work well on the rb25 there is no point me getting it

Maybe it has an RB26 in it. Or an RB26 cylinder head. Or maybe it was done so they could get the extra throttle response from the multiple throttle bodies. Drifters need throttle response much more than they need excessive power, particularly long wheelbase heavy sedans. One thing is for sure, there is far more to it than just the plenum.:cheers:

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HKS34R Collaborator

HKS34R

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so SK, if i was to do it on my fairly stock rb25? the gains would be almost zero? if i dont lose any power, responds i will still do it as i want the piping shorter

Why not go for an aftermarket plenum made for the RB25?? At least then you know some R&D has gone into its design to make sure it works.

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Sydneykid Grand Master

Sydneykid

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so SK, if i was to do it on my fairly stock rb25? the gains would be almost zero? if i dont loser any power, responds i will still do it as i want the piping shorter

Forget about GAINS, you are looking at LOSSES. Have a read.....

Some info on the RB20 with RB26 inlet as per Zoom Magazine edition 64 and edition 62;

RB20withRB26Inlet.jpg

This picture shows the RB26 plenum being test fitted up to the cut and welded RB20 inlet. The throttle bodies go between the RB26 plenum and the modified (shortened) RB20 inlet but are not shown in this photo.

RB20inletwithRB26Plenum.jpg

This is a picture of the RB26 plenum, RB26 throttle bodies and RB20 shortened inlet on the RB20.

RB20withRB26InletonEngine.jpg

Using a 120 degree bend at the throttle body reduces the difference in intercooler pipework by more than 50%, to a bit less than 1 litre using 75 mm pipework.

NN120DegreeFront.jpg

NN120DegreeSide.jpg

To work out the throttle response difference the calculations are easy;

2500 cc X 5000 rpm / 2 (4 stroke) at 1.3 bar = 135 litres per second

So a saving of 1 litre represents less than 0.005 of a second

That's not a lot of lag to save with reduced pipework.

So using an RB26 plenum and throttle bodies on anything other than an RB26 is not a good idea in my opinion. Especially when you consider the potential to loose throttle response due to poor airflow distribution is far greater than any minute shortening of the inlet pipework.

My 20 cents worth:cheers:

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