got a 91 civic dx hatch... has the d15b1 block with a d16y7 head.
trying to do the swap to mpfi. got the intake manifold with injectors from a 92 civc which if im reading it right was a p10.
im not sure what else im gonna need.

i think i also need an obd1 ecu and dizzy

is there anyway of doing the swap with the exsisting obd0 ecu and dizzy...or is it completly neccesary to change them?

 

You need to change the ecu and get a jumper harness if your swapping obd1 intake. Also need distributor off d16 obd1 I think that should be it for parts then do some wiring...might need a 4 wire o2 sensor not sure search around here there's lots of info

 

No. Your existing ECU, wiring, and distributor are only capable of supporting 2 fuel injectors only.

If you go MPFI, then you need an MPFI ECU. This can be either OBDO or OBD1.

If you go OBD0 you will need
OBD0 ECU
OBD0 distributor
DPFI to MPFI wiring conversion

If you go OBD1 you will need
OBD1 ECU
OBD1 distributor
4 wire O2 sensor
DPFI to MPFI wiring conversion
OBD0 to OBD1 jumper harness

 

what would would be the easier/cheaper route to take

 

do you really need the o2 sensors? wouldn't it just turn the cel on and thats it or will it hurt the performance?

 

The first option.

You need a crx si harness. make sure it has the resistor box.
theres a very simple write up for this on this site. If im not mistaken, its linked in one of the stickys.

good luck!

 

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You do NOT need an Si harness.

If going OBD0 route;
You modify your existing engine harness.
Trying to plug in an Si engine harness to the stock DPFI firewall plugs WILL NOT work.
2 injector clips and distributor plug that matches your new distributor are all that is needed for the harness conversion.

For OBD1
You do need the O2 sensor. O2 sensor controls so much in regards to your fuel delivery that it will hurt economy and performance in addition to the check engine light being on all the time.


For either route, you can use injector that require a resistor box, or you can use the type that don't require the resistor box.
They are not OBD specific.
You just have to make sure they have the correct flow rate that matches the stock engine/injector setup that your ECU is from.

If you go with the older injectors that require a resistor box, then obviously you will need the resistor box plug to add to your engine harness.


Here is a flow rate chart
http://www.phearable.net/tech/stockinjectorsizes.html
For example, if you went with the ECU for a D16A6 you would need an injector that flowed 235cc/min.
There are LOT of injectors that flow 235!
THEN you have to make sure they are compatible with your fuel rail and intake manifold.
Likely it's been tried before so Google or ask here.

 

My mistake

 

Actually, the intake manifold is not OBD dependent.
There is no such thing as an "OBD" intake manifold.

You can run a D16Z6 (stock runs with an OBD1 ECU) or even a D16Y8 manifold (stock runs with an OBD2 ECU) just fine with an OBD0 ECU.

 

iv looked threw all the post and i think the easiest thing for me at the moment would be to go with the obd1 conversion as well. i have the p10 im from a 92 civic with the fuel rail and injectors. so if im reading everything correctly means i will need an obd1 ecu and dizzy as well as the 02 sensors and also a resistor box for the injectors.

 

if your using obd1injectors you dont need a resistor box, regardless of the obd you decide on. if you use obd0 injectors you do need the box . your best bet is going to be obd0. get a dizzy and ecu from a d16a6. the wiring you need you can get from an obd0 integra(easier to find in my location)use the obd1 injectors and no resistor box. thats how ive always done it. make sure your wiring is soldered, and heat shrunk. you dont want to pull that joker out again. trust me i know. GL

 

went to the local junk yard today and all i was able to get was the obd1 ecu/dizzy. iv got the wiring diagrahm to convert the ecu but cannot find the one for the distributor. the stock plugs have the 5 prong plug and the 2 prong plug. can anybody explain what goes where.

 

Cut your plugs off and solder new plugs on.
Or, buy a distributor adaptor (rywire sells them)

OBD0 -- OBD1
orange -- orange
white -- white
orange/blue -- orange/blue
white/blue -- white/blue
blue/green -- blue/green
blue/yellow -- blue/yellow
large white -- yellow/green <- only color that is different
black/yellow -- black/yellow
blue -- blue

B11-CYP P Orange, CYP sensor input
B12-CYP M White, CYP sensor signal
B13-TDC P Org/Blue, TDC sensor input
B14-TDC M Wht/Blue, TDC sensor signal
B15-CKP P Blu/Green, CKP Sensor input
B16-CKP M Blu/yel, CKP Sensor signal

 

on the obd0 side of what you r showing there are 9 colors. mine has 7 5 on the big plug 2 on the little. im good with the little plug its the big plug im stuck on.

the wires to it are
white
white
orange
orange/green
white/green