Greddy Plenum Install

[B33st]

Can some one who has installed a greddy plenum on a RB25 please take a look at the picture below and see if i have connected things up correctly.

What are these two valves are what is their function...?

At the moment i have no idea where the larger of the 3 hoses you can see is soposed to connect to, any ideas?

Do english install instructions exist for these greddy plenums the only guide i have found is this link but i does not go into any detail of reconnecting all this back up.

Edited December 27, 2005 by B33st

[maximajim]

Yes it's correct. Those are the idle control valve/fast idle soldenoid and air regulator.

The largest of the hoses needs to be connected somewhere pre-Throttle body (ie cold pipe).

[Syphon]

In your picture, the top one is the IAA unit, basically it controls idle speed by allowing air to bypass the throttle body. This is where you generally adjust idle. It also has another valve which increases idle speed when your Air con is switched on to stop the motor stalling with extra load.

The bottom valve is the Air Regulator, its only real function is for high idle on cold starts. This is what increases the idle to 1000rpm+ when stone cold, has a little coil in it which when warm, closes off the valve, in turn stops more air bypassing the throttle body and motor returns to normal idle speed.

Forgive me if I am a little off, as most of my experience is with RB30's but the philosophy is the same

It would normally go to the standard metal intake pipe which runs from throttle body over rocker cover. Having never seen or installed one of these plenums, I am guessing that you need to feed it somewhere "BEFORE" the throttle body in the intake piping.

[Waldo]

just a quick question...with say..custom plenum do you need these parts welded into the plenum still?? will i always have to use these 2 valves? but if my custom plenum uses the stock runners the air regulator valve will still be able to bolt on..right?

[Downforce]

So you waited until you pulled it apart to figure out you're not 100% sure how it goes back together? :lol: Gutsy. I like it

[B33st]

GTTR34 if it went beck on the same way the old one came off it would be too easy. Installing the Greddy plenum the valves are moved to another location and plumbed differently to the way they were origianlly, it even involved cutting/modifing the rubber hoses.