Noticed my h22a jdm motor comes with IABS. The chip in my ecu is programed using crome. The issue is I am unable to edit the IAB engagement. The number is set to 7900+ rpm. Now why is it most roms I'm seeing for h22a vtec motors have no IAB control ability.

Also, If I want to add tables in order for me to copy files from one table to another so it will fit, how do I do so? I know I can just copy the peramiters that match the closest rpm values but Id rather know If I can just do a straight copy and paste by adding tables to empty rom or existing rom (rom listed below).

The rom I've built off is the JDMh22aFinal found at PGMIF crome bins or Xenocron Bins.

 

So I've redone the map in a p72 baseform. I set IABs at only 2000 as to test and they do not engage. I than took the step to remake the map in Uberdata. IABs engage flawlessly at what ever rpm level I set.

The maps have exactly the same values but the numbers in the columns for IN/HG are not the same between both maps so the values will be skewed from eachother. I have compaired virgin maps from multiple different ecus between both systems Uber data and Crome though and the numbers are EXACTLY the same even with the column numbers being off by as much ast a couple inches/hg. Does that not make a huge difference in the values? By my math some of the values may be skewed by up to 5% or more between the two maps.

 

There's a good chance your ECU either doesn't have IAB hardware or you don't have everything hooked up properly. In either case, you can simply remove the IABs if necessary or unhook it from the vacuum source which will leave them open all the time.

 

Please Reread my post HRtuning. I used same ecu, redid whole program using p72 basemap in Uberdata, and IABs worked flawlessly. Something to do with crome.

2ndly, removing IABs is the worst advice you can give someone. If you look at average torque values on tuned jdmh22a the ones with IABs average 10 + more peak torque (even as high as 20) with IABs working properly. IABs are a practical design to provide free torque. They are in there for a reason, may as well use them.

Even compare two dyno jet stock motors. One h22a1 usdm, and a h22a jdm swap, tuned on p28. The h22a jdm will net 202 hp, and 141 torque, No IABs. H22a1 usdm will net 195 hp and 152 torque with stock IAB system working (actual numbers from same tuning shop, same tuner, same dyno)

The jdm has a more aggressive map, and higher compression so yes, yields more peak horsepower. The usdm though yields more torque, and for that reason I apply evidence C. Jdm h22a tuned on p72 Uberdata with IABs on dynojet same shop, same tuner, same dyno.
202 hp, 162 torque tuned IABs aswell to engage at 4400 with vtec at 4000.

 

Actually, it's not the worst advice you can give someone... if the hardware to control IABs isn't present, which is what I suggested if you read my post again. If it doesn't open up properly on the top end, you lose a lot... vs losing a little bit of low end torque with them open all the time.

I've actually tuned plenty myself, rather than base my info on someone else's dyno numbers. Thanks for your input though. Good luck with your setup.

 

Thanks for your continued responses. So in your opinion what do you credit the extra torque between two identical JDM h22a than? Only difference in setup was literally IABs functioning and tuned, or not.

I will tune it properly on a dyno. I just want the setup working where all they have to do is manuplate the engagement value.

Yeah, the hardware is present now so thats not the issue. It activates properly in uberdata but in crome the IABs don't operate at ALL. They will not see initial vacuum that will close them upon start up in CROME. Uberdata,...things work flawlessly!

 

As I already mentioned keeping them open will lose low-mid torque, I won't continue on with your questions irrelevant to the topic...

You said you used "P72 baseform", but if it worked in Uberdata with a P72 code base it would be working in Crome under the P72 code base as well. When using Crome you need to start with a P72 code base or add a plugin to the P30 code base to be able to activate the IAB output, since P30 doesn't use this output by default.

Since most people use P30 code base with Crome, that's why most you see are disabled.

 

I used the P72 code base in Crome and IABs will not function at all period. I don't know what else to tell you. The solenoid does not see the ground the ecu is suppose to provide. In this system they switch the ground and not the power at the ecu to operate IABs in this Particular generation of car. The Solenoid is NOT seeing the ground and will always show open. The vacuum diaphram has NO vacuum at any time indicating the valve is shut and not sending intake vacuum.

I already know it WOULD work in Uberdata if it works in Crome,...BUT ITS NOT!

The p72 base code in Uberdata will run the IABs properly. I have an issue with crome I would believe than. its 1.5 version.

I don't understand why this happens though. The program on uberdata and crome are exactly the same. The Rom just needs to tell the ecu when to open or close the switch from a grounded potential in the ecu that leads out of pin A17 to the solenoid. Crome has to be the issue.

If you have a rom with IABs in crome for a jdmh22a or know where to find one to test if other roms in crome will function IABs, I would gladly test it. Set IABs at like 2000 so I don't gotta rev the **** out of my car on a basemap and away I go.

 

There's two P72 basecodes...

If you're using a USDM ECU, you need the USDM P72 basecode or you need to switch the JDM IAB output byte.

If you're using a JDM ECU, you need the JDM P72 basecode or you need to switch the JDM IAB output byte.

My guess is you're using a USDM ECU, though you've failed to mention what ECU you're working with specifically, since Uberdata's default is a USDM P72 program and you say that works. Sounds like you're loading a JDM P72 basecode in Crome, which without adjusting the IAB byte is indeed outputting, just on the wrong output...

Yes, this does mean USDM and JDM ECUs output IAB differently.

 

aHHHH ! Thank you. I had no clue, I knew there was two methods for controlling IABs. ODB1 I believe switches the ground at the ecu and OBD2 switches the power though. DIdn't know there was a difference in JDM and USDM p72 basecode.

Yeah, the ECU is a po5 converted to run vtec, and IABs as well as operate a manual car.

So how do I change the IAB output byte in crome?

What you said is right. I used the JDMh22afinal basemap from crome in PGMFI to generate off of.

Thanks again man, I'm glad I'm finally getting somewhere on this. I've done literally hundreds of hours of reading. I know exactly how the IABs work but I deffinitely DO NOT understand everything about tuning.

 

If the option byte isn't directly visible in Crome, email the bin you're using to me. I'll change it for you and send it back. Info@HRTuning.com

 

what about a p28...would like to have functioning iabs rather than removing them. and if im reading correctly...seems like i should be able to put a jdm h22a basemap on the p28 using uberdata and have control of the iabs

 

P28s need hardware added to them in order to utilize the IAB output.

 

where do i get the hardware....or would it b a better idea jus to trade for a p72 or am i able to chip and tune my p13