RB20det AACV halp

[R32Dragon]

Im in need of a new RB20/25 Auxilary air control valve for my RB20, but cant seem to track down one anywhere. Tried a CA one, that didnt pan out. A L28 one is coming, but im not sure that'll work either.

Does anyone know where I can get one of these things here in the States?!?!

[Eikon]

rb20 and rb25 are different.

I might have a spare rb20 aac in my basement. I'll check tomorrow morning.

[R32Dragon]

They are!? Lame. I knew the AICV assemblies were different, thought they shared the same AAC though.

Yeah if you could track me down one, I would gladly pay you a fair chunk for it.

[Carl H]

aac are the same, iacs are different.which one do you need?

[Eikon]

Carl, The Auxiliary air controller is the one at the back of the manifold? The mounting holes are different from rb20 to rb25 from what I remember correctly. Nismo Zilvia got an aftermarket intake from Aussieland and I remember that the guy drilled the holes for the rb25 AAC. The two work the same and plug in the same, but I'm pretty sure the mount holes are different.

[devil_child]

hmm odd, mine is ka24de and it works just fine.

for the record, my AAC valve is off a nissan sentra 90-94. plugs right in and closes after 7 minutes just like the rb one.

No idle problems whatsoever. idle 750-760 15*.

[Coolwhip]

Isn't the AAC under the manifold? Which are the same.

The IAC is the one thats different that actually bolts to the manifold.

I might have the terms mixed up, oh well, I'll try to snap a picture of all 3 (20, 25, 26) when I am able to for comparison.

[devil_child]

wait no.

the fsm says IACV or idle air adjustment IAA *system* has different components. the AAC auxilary air control valve on the back of teh manifold. The Air Regulator down on the bottom. So the IACV is a set of components essentially. Consists of the Auxilary air control the Air regulator and sometimes the FCID (whatever the hell that means) for the ac system.

[Eikon]

crap.. maybe i'm screwed up on the terms too..

I thought the AAC was the little square shaped attachment with the idle screw on it.

I thought the IACV was the longer cylinder shaped thing that sits parallel to the fuel rail.

lol

[devil_child]

sorry had to edit ^^ refer to previous post sorry for the confusion.

[Coolwhip]

good call

[Eikon]

Here's a thread with pictures. zerothread?id=304853

This is what I think is the AAC



This is what I think is the IACV



Which is which????

To the Original Poster... I have the first one in my basement.. The one that looks like this:

[Carl H]

iac - idle air control valve = valve on back of cylinder.aac - auxiliary air control valve = valve under plenum (rb20) or under the intake manifold (25/25).neo 25s lack an aac in favor of an sr style wax based aac which works against coolant temp.

[gawdzilla]

let me try to clear up confusion, based on what the FSM says.

the first picture is an AAC, as is the third picture (posted by Eikon). They are different variations (not from the same motor). The 3rd picture looks a lot like the AAC coming off the 26. Not sure which AAC the first picture is from. The AAC itself has the motor in it which moves a button based on a PWM signal. This controls the amount of air which can go by actively for idling. The motor itself you can see is attached to the "mounting piece" in the 3rd picture by those 2 screws. I wouldn't be surprised if pic 1 and 3's motors are the same and just have different mounting pieces. The mounting piece is what has a spring (which is pushed by the motor), to control airflow.

the second picture with the dark blue plug is the Air regulator. That is simply supplied a 12v signal, and over time, it opens up (or closes), i forget. To also regulate airflow. This is not actively opening and closing. It is for cold starting.

These two (AAC and air reuglator) combined, both control idling. Nissan FSM doesn't mention an IACV, which is commonly used in mechanic world terminology. Some people use it to reference the AAC and Air regulator combined, some reference it as the AAC only, some reference the air regulator.

On the 25, there is also an FICD (i think it stands for fast idle something). That relates to AC and bumps the idle. I have never dealt with this one, and I believe the 20 and 26 don't even have this (AAC handles it)
Modified by gawdzilla at 11:12 AM 4/17/2008

[R32Dragon]

Thanks for all the advice. The L28 AAC worked great with a little persuasion.
Modified by R32Dragon at 12:55 AM 4/23/2008

[yotik]

IAC is the top picture according to my sources. Not saying anyones wrong just trying to make sure i order the right peice. the housing is cracked on mine im looking at a replacement ....
Modified by yotik at 8:27 PM 8/20/2008

[nizmo zilvia]

Just for the record that those are my pics posted above and that I am using a RB25 AAC on my RB20. They both have different bolt patterns to they are NOT interchangeable! Reason being is the guy that made my custom intake manifold made a RB25 pattern instead of a RB20.

Just figured I'd let you guys know.

Eikon is correct on the information.

[yotik]

i found out the one i cracked was the air regulator. its the second one down with the blue clip.