purge

this is my first attempt for a swap. could someone point me in the correct electronic direction? what ecu and wiring harness is neccessary to install a 91 b18a in a 95 civic dx. thanks

dlric

the 91 b18a, if i recall correctly, is obd0. the 92-93 b18a's, however, are obd1. your civic is obd1. my suggestion would be for you to get a 92-93 b18a or obd1 b18b intake mani/tb and an obd1 b18a/b18b engine harness. you can use your stock civic engine harness as well. the oxygen sensor wires would need to be extended tho to reach the oxygen sensor on the b-series exhaust mani. dunno if any other mods would have to be made. i just used a b18a obd1 harness.

you'll also need to get a PR4 obd1 integra ecu (so the ecu out of a 92-93 or 94-97 integra). also, the driv side eng mount bracket needs to be replaced with a 94+ integra bracket. and you'll need a b18a throttle cable. obviously you'd need a hydro b-series tranny as well. good luck for the money a b18a costs, its a pretty damn good swap.

purge

thanks for the help. i have a pr4 and b18a out of a 91 integra but i thought that the pr4 was an obdo. someone had suggested the p72 was the way to go. any thoughts? also whats the difference between the 90-91 and the 92-93 manifolds?

dohcdelsol93

for the b18a obd I you need a p74 ecu or an obd I p75. The 90-93 teggie IM are a bitch to work with, too many different sensors and vacume hoses that you don't need, I'd get a complete 94 teggie ls IM complete with sensors(this can be from automatic ) but the TB has to be from 5spd. Make sure your ecu is from a 5spd teggie aswell. you can use the cable tranny with a conversion kit from hasport but your engine will be jerky on starts and b/t with the loss of the lower front tranny mount. You will also need the rear engine mount bracket from a 5spd 94+ teggie. This will give you a complete plug and play set up with the exception of a few sensors that will need to be extended. No relocating of map sensors or vaccume hoses. Heres a list of what you need to make your engine OBDI
94-95 ls or gsr injectors
94-95 ls dizzy
94-95 alt.
if you want ac you need an ac bracket from a 94 dohc vtec del sol or a front a/c bracked of a 94+teggie if you dont mind the loss, either way you'll need it, it's also a mount bracket for the lower front dampner.
I've heard the 91 ls shifter linkage will work si if it's free I'd try it before I bought some for the 91+ teggie.
Hope this helps. I would personally wait til you find a hydro OBD I swap, unless you paying @6-700 for the swap it's not really worth it for all you need to make it work.

dlric

they also have an obd1 pr4 ecu. i have two of them. good info tho you got some stuff i forgot

purge

whats the difference between the p72, p74 and p75 ecu's?

dohcdelsol93

P72 is a vtec ecu(gsr I believe), p74 and obdI p75's are @ the same except the p75 also came in obdII. The p74 and p75 are non-vtec ecu's. Just remember when changing the obd of the engine every thing must match ecu, injectors, and dizzy.

purge

how about the p28? is that useful?

dohcdelsol93

P28 is for obdI sohc vtec d16z6.