Hey, I'm somewhat new to all this, but I'm very eager to learn I'm posting this in hope that someone could explain to me the differences between ODB I and ODB II ECU's - ie why is ODB I so much better?

Also, I can't seem to find any sort of software or chips for my P2P ODB IIb ECU. Without spending a boatload on Hondata, what's my best bet here? I'm guessing, from what I've read, that someone will say convert to ODB I, but why?. Am I out of luck unless I'm using an older, more commonly-tuned engine computer? Thanks

 

pre 96 ecus use a completely different architechture.
obd2 chips are expensive and only writable once. and only a few people know how to do it
pre96 ecus are much simpler, there are more programs available and chipping the ecu itself is cheap

hondata has come out with some new products that make it a little more affordable than before.

 

ECU boards are different. On the OBDI honda used much older technology with many resistors, sub chips, tranistors and so on. while the OBDII contains most of the data on only one chip. the programming is actually very simliar in both. but the cost of the chips isn't . while OBDI parts are few bucks (as most are obsolete), the OBDII are in $100 range for chip. programmers, emulators and so on also are much more expensive and not really common for the OBDII.

surface mount technology used to solder in a chip is much more invlolved and requires a skill.

JDM OBDII ECUs are pretty much OBDI ecu with just updated plugs and boards. many obdII sensors whicha re found in the USDM specs are not there.

chips do exist and be done for the P2P setup but at $300+ price tag, it usually becomes cheaper to simply get a OBDI P28/P08 + harness converter (can be had for about $300), with the OBDI you get cheaper chips which offer much more tunability and if anything happens its only few $ to replace a chip or ECU.

 

Thanks for the explanation, that cleared a few things up.

So basically I would want to get an ODBI-ODBII harness, and then find myself any old ODBI ECU and have it programmed? Or would I need an ECU that came from a similar engine? What I'm looking for is a general procedure to follow in the way of upgrading/chipping my ECU.

 

bump