I just wanted to know if IAB and IAC is the same thing but in a different name. If not then please correct me.

 

IAB = Butterfly System. (OEM GSR Intake manifold for example)
IAC = Idle Air Control

 

why would they be the same if there named different , thats like asking is a door and a window the same thing

 

well thats why i asked, I wasnt sure if its the same or not. Because I simply dont know where the IAB is located at. I looked on Helms manual and it shows IAC. So I wasnt sure if they meant IAB rather than IAC. So IAC on Helms manual is the closest to IAB. So I rather ask than to assume that I am correct. Which I am not.

 

where exactly is the IAB on a B18c1?

 

bar'dh22 no need to be rude isn't this were we all are supposed to come and learn about things we may not know?
hmtcrxsi as the person before stated yes IAB is the basicly like a vacuum reserve tank to operate your secondary butterflies in the intake mani. It's located on the underside of the intake manifold. I just put a c1 swap in and it didn come with one so i had to route around it. Hope this helps

 

#13 = IAB assembly. it includes the plate in between the two halves of the IM as well as the diaphragm that is activated by vaccuum

 

100% correct. IABs only exist on B18C1 (and variants) and H22s. It mostly resides in the intake manifold. There's a vacuum diaphragm for it on the driver's side of the intake manifold, and the canister and solenoid hang underneath the intake manifold.

 

Thank you. Thats exactly what i was looking for.

Although I have one more question, since the IAB is vaccuum powered how do I wire it up to the ECU? This is going into a 95 Civic DX

 

IAB



IAC

 

sorry i should have been more clear. the ecu sends a signal to a control solenoid which in turns the vaccuum on and off at the diapragm.


#9 receives a signal from the ecu (based on rpm/load) which controls #15 in my original pic, which comtrols the iab.

for wiring see below:

pay special attention to the note about non-vtec cars and using a vtec harness

 

beat me to it. ff-squad ftw!

 

again, yep. This should be correct for an EG, assuming you're using an OBD1 P72 ECU. No stock B series ecus other than P72s will recognize IABs (this means no P28s, no P75s, etc unless you get them chipped with at least a GSR basemap).

Power runs from the pinout on the ECU to the solenoid. Basically, at 5800rpm, the ECU sends 12V to the solenoid, which opens. Ground runs from the solenoid to the ground. I can't remember which side is signal and which side is ground at the solenoid though.

For best results, get a round 2 pin honda plug from the junkyard and solder your wires into it... should plug right into the solenoid. Then run vacuum as shown in the above diagrams. Also, be aware that you need a decent vacuum source to open that big honkin' diaphragm. I had trouble with mine not wanting to open until I T fitted it from the hose right off the back of the intake manifold.

I believe that OBD2a P72s are the same, but I'm not sure. I know that OBD2b P72s are different... in that case, the ECU supplies the ground, and the signal comes from any 12V source under the hood, then the ECU either grounds or ungrounds based on RPM. Seems bass-ackward to me, but that's how it is. I found out the OBD2bs were completely different when I chased mine around for a few months trying to get it to work.

 

thanks alot guys! it helped me ALOT! I appreciate it...

 

I'm under the imperssion you can run IABs just off of intake vacuum without using the electronic control portion. Will the IAB valve act similarly if just controlled by intake vacuum?

 

It won't know when to open and shut then. IAB is supposed to be off below 5800 rpm (no vacuum). At 5800, the ECU sends the signal to switch the solenoid and apply vacuum.

You need the solenoid, tank, and diaphragm.

 

So using crome how can I change the IAB engagement if that selection is Greyed out. Do I really need to generate a new map using a p72 base?

I have a jdmh22a with IABS but the tune I have is from a non IAB system so its greyed out in crome.

How can I get IABs to work properly than? (easiest solution) My ecu is wired to run IABS also.

 

without the solenoid and using just vacuum IABs will open at WOT, it's not the best way to do it though... the IABs get twitchy

 

What ECU are you running? According to Hondata, if your ECU doesn't have the circuitry to control the IAB, then it can't. Even if you load a P72 basemap, it still doesn't have to components on the circuit board to handle the IAB.

From Hondata's site:

"The IAB or secondary intake runner is a set of butterflies in the intake manifold of B18C and H22A engines. The P72 ECU controls the IAB, but other ECUs do not. If IAB control is lost by swapping ECUs then the engine will always run on both intake runners, typically losing 8 hp from 3,000 to 5,500 rpm. "

So to get your IABs to work properly, you'd need a chipped P72 ecu then re-tune for your setup.

 

I have a converted Po5. Its now wired/chiped to run vtec, IABS, etc. Put components in today. So yeah, I guess I gotta regenerate the whole program but with a p72 origin. I remade the program in uberdata, just wanted to try a different platform. The car idles not as awell as the crome program. All columns have starting different values ie RPM, vacuum. Some are editable, others arnt. Crome has a few more features though. So its hard to copy exact values from my tuned program. Any options?

Anyways, how do you add more tables to Crome? I notice p72 don't have as many tables in high fueling, and high ignition as my current map. Theres only 15, as opposed to 20. SO than Instead of cutting and pasting I have to blend the values in?..there has to be an easier way.

 

LoL, remade the map in uberdata on a p72 base. Got IABS working now. Map is pretty flawless. Idles a bit rich, just need a Wide band or a retune to make it perfect.

Now swapping between two platforms will the numbers in crome and uberdata's fueling and ignition maps translate to the same thing on the ecu? As long as the numbers are exactly the same, the map should perform exactly the same right?