Recently sold my jdm p13 ecu, and socketed my very first ecu... a p28. Waiting on a buddy to burn the chip for me. Before selling the p13, car ran and drove like brand new...the swap went great.

Anyways, from what I understand my secondaries are now worthless with the p28 ecu. Is there a correct way to delete the secondaries, or do I just remove them and whatever is attached to that plate? I think there's a vacuum line involved, as well as a solenoid box...what do I do with those? I want to correctly delete that secondary plate without any problems arising.

I did a quick search for a walk-through and didn't find any. If there is a good write up on this, please link.

Thanks!

 

take off the top half of the intake manifold, and take off the IAB plate. then just remove the butterflies inside (2 screws per butterfly). then re-install

 

or just take the plate out completely; remove studs; use shorter bolts

 

but that would lower the intake plenum volume.....

 

Any differences between removing the butterflies...or removing the whole plate setup?

I'm leaning towards removing the whole assembly, for a cleaner look/less stuff under the hood...I'm just not sure if there's vacuum lines I need to plug or re-route.

EDIT: Just seen your post, autoluder. That does make sense, I suppose I could just remove the butterflies and leave the plate...and just remove everything connected to it that I don't need anymore. I'm trying to go for a barebones/tucked engine compartment, and ridding of as much as I possibly can without causing any issues.

 

I'd just take the plate out if you have no way of using them. There is a diaphram on the plate that has a vacuum line, so you'll have to remove that line also, but no biggie...that will be cleaner too.

 

The gold diaphragm that has the vacuum line running from it to the black solenoid box mounted to the underside of the intake manifold?

If I remember correctly...other than the plate+diaphragm, that black box is the only other thing I need to remove. I can just cap off the solenoid wiring for future use.

I'll give this a try tomorrow, and post an update. Thanks guys.

 

Yep, that's the diaphram.

 

hers a pic i just unscrewed the plates and cut the rods with a dremel, and left the diaphram attached, the upper one got machined for my ported intake manifold.

 

Or you could wire the P28 to operate them. I've seen people hook it up to VTEC also, so that it opens the same time. It's good for a few ft-lbs below 4k.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dartonh22 &raquo;</TD></TR><TR><TD CLASS="quote">
hers a pic i just unscrewed the plates and cut the rods with a dremel, and left the diaphram attached, the upper one got machined for my ported intake manifold.</TD></TR></TABLE>

I would have just bought a Blacktrax spacer if you were going to do all that...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PirateMcFred &raquo;</TD></TR><TR><TD CLASS="quote">Or you could wire the P28 to operate them. I've seen people hook it up to VTEC also, so that it opens the same time. It's good for a few ft-lbs below 4k.</TD></TR></TABLE>

Makes sense to keep them for NA, if you're using the stock mani.

 

Is there software involved with getting the p28 to run those secondaries...or an actual ECU modification? Any links for this? If I could keep them working somehow, I'd do that. I'm not sure how effective they would be if I ran them off my VTEC, which was changed to about 4750RPM.

If that ends up being too much of a pain in the rear, I may just get that Blacktrax spacer for $75...

http://www.blacktrax.net/BTP_IMS.html


Modified by socialistic at 12:32 PM 6/20/2008

 

Its not much work at all. My ecu is set up to run IAB's. Software wise its just as easy as a click as far as crome is concerned.

 

You're running a p28?

I'll try to find someone around here that tunes on crome.

 

http://forum.ectune.com/viewto...n+cut

 

Heres my two cents on this issue. If you remove the secondairys on the H22a you are going to need to tune it obviously. The secondairies open at a higher Rpm and are closed at low RPMs. Having them removed wiould be the same as having them opened all the time.

So you will run crappier at lower RPMs. There would be more air than gas combusting which is not good.

O NOES

Solution here is to tune to compensate the diffrence.

 

98vtec: That link requires login.

I just got off the phone with my buddy that will be burning my chip. He's throwing on stock jdm h22a basemaps, 2step launch control, and switching my VTEC to a lower RPM. He says he is unaware of any way to get the p28 to run secondaries.

He didn't comment on wiring my secondaries to run with VTEC. If I did do that, the secondaries would be turning on around 4750RPM and staying on with VTEC obviously. Would this be good enough? When do they usually turn on with the jdm p13 ecu?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hawkze_2.3 &raquo;</TD></TR><TR><TD CLASS="quote">

I would have just bought a Blacktrax spacer if you were going to do all that...</TD></TR></TABLE>

do all what? all i did was cut out the rods, not all that hard, the one that was machined came with the ported manifold that i bought from a freind for $150 alot cheaper than blacktrax.

to the OP you could just put a regular vacuum source to the diaphragm and have the butterflies open up depending on throttle.

 

I'm still trying to figure out ways to keep the secondaries working.

So far some options I've heard are...run with VTEC, run with TPS, modify my p28 ecu.

Now...I want these secondaries to run the same OR better than they did with the p13 ecu. If they're going to be opening/closing at odd times, not doing me any good...then there's no point in keeping them.

I also can not find any up-to-date guides on the p28 iab mod, but from what I've read...it's possible.

 

I removed the butterfly plates, shaft and the diaphragm. Then seal off the ends with a large cap rivet and JB Weld. The low end loss was obvious until the ECU was retuned.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dartonh22 &raquo;</TD></TR><TR><TD CLASS="quote">

do all what? all i did was cut out the rods, not all that hard, the one that was machined came with the ported manifold that i bought from a freind for $150 alot cheaper than blacktrax.

to the OP you could just put a regular vacuum source to the diaphragm and have the butterflies open up depending on throttle.</TD></TR></TABLE>

Yeah, I was just thinking that now you have a ruined OEM IAB plate, plus the Blacktrax spacer is also a heat shield material and I don't think it's more than $70-80...anyhow, not trying to criticize

 

supposedley the P72 can be tuned for use of the butterflies.....iabs........

 

We know.

Running secondaries isn't about a tune, it's about the chipboard having the circuitry to run them.

 

Did some more searching on google and guess what I found?

Not only did I find a guide to keeping your secondaries with a p28...but I also came across 2 other useful links to xenocron's website. One is for the parts kit to add IAB to P05, P06, PR4 or P28 ECUs...the other is the walk-through for this job. Kit is only $5+shipping, and it's easy as hell. Sweet!

Xenocron parts kit(add IAB to your OBD-1 P05, P06, PR4 or P28 ECU)-
http://www.xenocron.com/catalo....html

Xenocron installation/info guide-
http://www.xenocron.com/install/OBD1-IABs.htm