Vegetaman111

Ok, so my friend has a 91 hatch. It was originally obd0 obviously but it was swapped to obd1. However, they left the dpfi on it being morons and now want to go b18a1 obd1 for serious tuning purposes. My question is since the car is technically obd1, what needs done wiring wise to swap a b18a1 into it. Someone said a b series obd1 harness will do it but I don't see how. It can't be that easy.

Bobby17772

I'm just wondering how they turned it obd1 but left it dpfi lol

Vegetaman111

i think it was rewired cause it was a cut harness and resoldered so it is wired in as obd1 but never converted. it has a d15b7 in it with obd1 ecu and all. thats why i am lost as well cause he wants to do a b18a1 swap into it and i have no clue where to start. i see all these swaps and everyone goes obd0 cause it is easy but we are building it to boost and cant boost a obd0.

Bobby17772

well first would be to convert it over to mpfi. There is a great write up on here if you want to do it yourself, or there is a guy on here there sells different harnesses and I'm if you don't see one he can make you one, the price is pretty cheap and he doesn't require a core charge so he's a good idea

Vegetaman111

ok, so after i go mpfi where do i go from there? I have seen the mpfi conversion and the obd0 b18a1swaps but never mpfi swap with a obd1 b18a1

Bobby17772

Harness conversions obd-0 obd-1 v-tec ecus & parts I believe it's the 5th one down that you need. if not like I said you can just contact him, he's very easy to work with

Vegetaman111

ok, well, i bought an extra harness from pick n pull today so i can do the obd0 dpfi - mpfi myself but i was wondering is there a place to find a d-i-y for obd0-1 jumper or wire it myself? i went though college for hardware wiring so it doesnt seem like it will be too hard to do either just need to know materials. thanks for all this help man.

INJEN78

you cant convert to obd1 without also going mpfi..there is no dpfi obd1 motor

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D16SiHatch

precisely. your ecu is obd0. to run the ls just convert to mpfi and get yourself an obd0 pr4

__________________
91 Civic Si
b18b1, I/H/E, 6000k HID kit, 94 teg cluster
Parting mustang out to buy another civic

Vegetaman111

I know this but I'm going obd1 after I convert to mpfi, but I don't wanna spend 80.00 on a obd0-1 jumper. I'd rather learn to make my own.

INJEN78

so make your own..im sure you could find someone with a jumper that you could get an idea of what you need to do..
but there is no way your harness was made into obd1 without doing the mpfi as well..so first y ou need to figure out what is going on with that

__________________
R.I.P BEN LEE2/24/08 we love and miss you
http://burnoutbox.activeboard.com/in...BID=127652&p=1
GOOD FAST CHEAP,
you can pick only two.
fast and cheap isn't good
good and cheap isn't fast
good and fast isn't cheap

Vegetaman111

My buddy said the d15b7 was swapped in but kept obd0 so pretty much a d15b2

Vegetaman111

Ok, I guess I'm going to go dpfi to mpfi then look into someone's harness for a pinout and do that. The car has 2 ecus but one is used so I will pull the other apart and use it as a start. Any ideas as fat as where to find a pinout? Local guys do t run boost to crx/ef civics so I'll be the first there but that also means I gotta do it ony own. Thanks for the advice so far though guys.

INJEN78

and the d15b7 is also obd1 so i rlly dont know what is going on with your car..

__________________
R.I.P BEN LEE2/24/08 we love and miss you
http://burnoutbox.activeboard.com/in...BID=127652&p=1
GOOD FAST CHEAP,
you can pick only two.
fast and cheap isn't good
good and cheap isn't fast
good and fast isn't cheap

Vegetaman111

i guess the guy he bought the car off of lied because he said he did the mpfi swap but all he did was swap over the d15b7 and kept it obd0 so pretty much still a d15b2.

Bobby17772

but it would have had to of done the mpfi swap because if he didn't it wouldn't be able to run

INJEN78

exactly..check the code on the engine..and take pix of the bay...is there a resistor box on the drivers shock tower?

__________________
R.I.P BEN LEE2/24/08 we love and miss you
http://burnoutbox.activeboard.com/in...BID=127652&p=1
GOOD FAST CHEAP,
you can pick only two.
fast and cheap isn't good
good and cheap isn't fast
good and fast isn't cheap

Bobby17772

does your engine bay look like this


or like this

Vegetaman111

first one.

Bobby17772

then they lied to you, it's still a d15b2

INJEN78

lol yep..so its obd0 dpfi

__________________
R.I.P BEN LEE2/24/08 we love and miss you
http://burnoutbox.activeboard.com/in...BID=127652&p=1
GOOD FAST CHEAP,
you can pick only two.
fast and cheap isn't good
good and cheap isn't fast
good and fast isn't cheap

D16SiHatch

not necessarily. it might still be a d15b7. previous owners might have just swapped over the b2 dizzy and dpfi manifold to the b7.

__________________
91 Civic Si
b18b1, I/H/E, 6000k HID kit, 94 teg cluster
Parting mustang out to buy another civic

Bobby17772

yeah I guess that's true, dumb on the previous owners behalf, but true

INJEN78

most likely kept the b2...just check the block for the code...

__________________
R.I.P BEN LEE2/24/08 we love and miss you
http://burnoutbox.activeboard.com/in...BID=127652&p=1
GOOD FAST CHEAP,
you can pick only two.
fast and cheap isn't good
good and cheap isn't fast
good and fast isn't cheap

Vegetaman111

block says b7. i think thats why i dont trust the guy on anything. he said it was swapped, only thing different is the block. its still pretty much a d15b7. anyways, so back to step 1. i am preparing to do a dpfi to mpfi conversion, after that how do i setup for a b series swap? non vtec. obd1 for tuning purposes.