wuts the diff between them (pr4 and obd1 p75).. is pr4 obd1 too?? reason im askin cuz my friend is running a ls motor on his 95 civic with the pr4.. is that the right ecu?? cuz i know that ecu comes with the 92-93 integra ... tia

 

the pr4 came in 90-91 as an obd0 and 92-93 as an obd1. the p75 was the 94+ obd1 ecu. either odb1 ecu would work good.

 

OBD1 PR4 and the the OBD1 P75 are the same.

 

is that right if i find PR4 stamped Rods in a B18b block???

got a B18b engine, and the head is stamped PR4 and the ECU is also PR4 obd1, so its still the same as any P75 B18b engine right??

 

yupe. same thing.

 

i believe the pr4 came in 92-93 LS and the p75 came from 94-95 LS. Its kinda like the GSR 92-93 p61, 94-95 p72

 

the b18b is 94' up correct?? manufactured in 93' as 94' motors right??...then why is all my stuff PR4..... just wondering why honda would drag the PR4 label past 93'.......the GSR they didnt do that...i found (2) 94' Integra B18b LS motors with PR4 on them...no big deal to me but makes some people think its a 90-93 motor or B18a parts

 

94+ is b18b...and manufactured in 93...my 94 gsr head says it was produced in 93....but as for yours saying pr4....i think honda just kept in in general terms..i'm guessing...pr4 is LS..lol, i dont know.....your guess is as good as mine as to why they did that...but yeah..no difference between the 2.

 

alot of times parts like rods, bolts, pistons and even heads if a certain number were made they'll use up the parts on hand(keeping a certain amount warehoused for replacementparts) before starting a new batch. 94's were produced in 93 so they could of used surplus parts till the new casting for the p75 parts took effect.