I see P06, P28, and the like. Which OBDI do I need for my 98 GSR motor? What are the differences?

I'm guessing that P72 OBDI is simply an earlier model for the same car..

 

like so:

http://cgi.ebay.com/ebaymotors/Honda...QQcmdZViewItem

 

another question: is there a difference between JDM ECU and USDM ECU (OBD1 or 2 P72)?

 

what mods do u have that is requiring to back date your ecu?

 

For full functionality of everything and correct fuel/ignition maps if you decide not to chip it, a P72 is the best choice. You can go with a P28 and chip it, but you won't have functionality of your knock sensor or secondary butterflies.

 

Well, running a P73 right now (not by choice) the secondaries are wired open at all times anyhow. If I were to chip it (without mods at this point), what would be the advantage over a stock OBD2 P72?

Also, where can I score a P72 at a good price... Any suggestions/ideas?

 

OBD2 P72 ECU's are practically being given away. You can find them for around $50 on ebay.

OBD1 P72 ECU's are quite expensive and pretty hard to find in non-chipped condition. You can find a few on ebay, but they will run around $220 or so. I just got an OBD1 P72 from some guy off Honda-tech for $165, so you can find them cheaper, but it is pretty hard to do so.

 

I guess the chip programming is specifically tuned to it's previous owner?

 

yeah, them p72's are outrageously expensive, especially virgin ones

 

But how does a virgin OBD1 P72 compare to an OBD2 P72?