Rb26 Intake Plenum Onto An Rb20det

[migs]

ok guys

im going to try the rb26 intake plenum on rb20 conversion

not going with the itbs tho im staying with the single throttle

my plan is to weld the rb26 plenum to the rb20 cut runners and the throttle to the plenum opening

as seen in the pic below

i just need to know this

there are many lines and stuff connected to the rb20 manifold must look like vacuum lines

will there be places where i could connect those lines on the rb26 manifold?

also there is a device in the back of the stock rb20 manifold im not sure what it is for tho, it looks like it has sum to do with the idle

what do i do with that ?

plz help

if you happen to have any links with these conversions plz post then

thanks

[Silvia GTR]

Yeah the AAC valve is for idle other than that I cant help you!

[bubba]

For the AAC valve I had a boss machined up and welded onto the bottom of the plenum.

There are also plenty of vacuum connections on the 26 plenum.

I'm using a Q45 throttlebody and still have the engine fan (unlike that photo) and using GTR plumbing, I've had to push the throttlebody as far back as practically possible (these things are huge!) and will probably have to weld a bend straight onto the throttlebody.

What they've done above with the water outlet is interesting but my throttlebody is in the way

Just be aware that the RB20 runners don't line up with the runners on the 26 plenum.. we had to heat and bend the first and last runners in and find a happy medium, the GTR runners are smaller and the 20 runners have much thicker walls so it wasn't too bad but it looks damn ugly on the bottom lol

Edited November 19, 2009 by bubba

[migs]

so is it all the runners that don't line up or just the first and the last ?

can you plz send me some pics of your conversion and the aac valve setup

[bubba]

None of the runners line up and RB20 is worse than RB25.

[funki_munki]

im interested in this aswell,when you go to do this maybe do a guide with step by step with pics would be awesome.