Just wondering what the differences were between the jdm and usdm oem ecu, i have a usdm itr with the jdm ecu and it burns a little rich with i.h.e ... normal?? and also i was wondering what the advantages or disadvantages of the jdm ecu are.

 

its got a speedlimiter of like 123mph? I believe it doesn't look for the 2nd O2 sensor. I also run a little rich in the higher rpm's, i think its normal.