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ECU:
All JDM Ecus have 180 km/h or 112 mp/h limit.
88-91 JDM Civics
SiR used 37820-PR3-XXXX ecu used VTEC so no USDM equavilent only useful for B16A swaps.

Si used 37820-PM7-XXXX ecu, will work same as USDM Si (PM6) and USDM/JDM 88-89 Integra (PG7) with differences in red lines and performance. Only for USDM Si, HF and EX.
90-91 JDM Integra

XSi/RSi used 37820-PWO-XXXX ecu will work same as PR3 ecu off SiR Civic.
 

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As long as the harness will adapt itll work...non-vtec ecu to a non-vtec engine...correct OBD to correct OBD ecu...got it?



notice the difference on the ECU's pins...

OBD2b on the very top, then OBD2a, then OBD1...the other ECU's are non-OBD
 
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