If I wanted to run an OBD1 ECU instead of my OBD2 (on my 5th gen), what would I need? I was thinking at first that I would want to use a OBD1 P13 ECU but it sounds like a pain in the butt to swap the distributor, various wires, and injectors. Now, some are recommending to just get an OBD1 P72 ECU (and the conversion harness of course). I don't want a P28 since I don't like the idea of losing the knock sensor or secondary valves. What would be the advantages and disadvantages of using a P13 vs P72?
From what I've gathered, P72 has more advanced timing but you'll have to get it remapped for a H22 if not, you'll run dangerously lean. The P72 by default also has a higher redline (if your head can handle it) and it's Hondata ready.
Keith I don't know why you are doing this. I am still running OBDII and I wouldn't switch unless I was putting in a hondata. And at that rate I'd just get an AEM EMS for $1000 and plug and play and call ita day. No ecu, no conversion harness, no distributor change.
Originally posted by Satan_SRV Keith I don't know why you are doing this. I am still running OBDII and I wouldn't switch unless I was putting in a hondata. And at that rate I'd just get an AEM EMS for $1000 and plug and play and call ita day. No ecu, no conversion harness, no distributor change.
Wouldn't it be easier/cheaper to just get a chipped P72 ECU and be done with it? From there, I would do the fuel mappings from my VAFC. No? Am I missing something?
Yep when dealing with chiped ecu's its not directly for your car. Its sorta like borrowed vafc settings. If your gonna do it, do it hondata. Make a custom chip for your car on the dyno. But then again i wouldnt do this unless i was going boost or a had a really good and ready to be tuned n/a setup. In other words just stick with obd2 and the workaround with your vafc.
Wouldn't it be easier/cheaper to just get a chipped P72 ECU and be done with it? From there, I would do the fuel mappings from my VAFC. No? Am I missing something?
What's the point? You don't even know what the chip specs are, or if they will help you. I have never seen a chipped ecu help any H22a.
Seriously, add up and lay out the costs of what you are suggesting
it doesn't require injectors. A v-afc can fix it or whatever.
If you don't change the distributor you can't change the timing. And a stock P72 is missing like 10-15 degrees of timing advance in the midrange that an H22a needs to make power.
Maybe you're bored and are looking to spend money or something, but it's bad idea and a waste of time if you ask me. I don't think your mods even warrant further tuning at this point.
What exactly do you think an OBDI swap and a stock P72 will help you gain??
If you want plug + play, a p13 isn't an optimal choice as you'd need to install ~340 cc injectors for the maps to be close. You can't really program it, as it uses much different software and data structures than p28/p30/p72 and either nobody can figure it out, or the people who have won't share.
Go with a USDM p72. It's pretty easy to chip the thing, I did my own. I burn my own chips, and it seems to work well. There are a couple of good H22 'basemaps' to start from. I don't run my p72 daily, as I need to get on a dyno with a wideband and do some real tuning. Seriously, though, it's not worth switching to OBD1 if you're still using the VAFC to control your fuel. Email or AIM (not PM) me if you would like to know more.
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