ok i decided to go obd 1 on my 89 crx (b18a motor) but i cant decide which ecu to use. one day ill decide to get the pr4 obd 1 ecu the next i want the p75 ecu. which one do you guys thing i should get? please help i cant decide. also i plan on getting hondata s200 also.

 

what ever is cheeper, and ditch hondata, http://www.pgmfi.org. Crome, its cheeper (free) and runs just as good if not better

 

The two ECUs are basically the same when it comes to mapping. The MAJOR differences are mounting and idle control. But when it comes to performance, boh will run a motor the same.