Hi Honda junkies, I have a 1991 Honda crx DX and I want to put a turbo on it and a few other things: ( skunk 2 intake manifold and throttle body, 350cc fuel injectors, 255lph fuel pump, stage 2 clutch, high compression Pistons, and then the ecu.) what I was wondering is can I install an obd1 ecu on my crx? Or would I have to convert from dpfi to mpfi? If so how can I do this? If I can't get a different ecu then I can't turbo it and everything needs to be obd1 ( ecu and distributer). Please comment on what you think. Thank you.

 

So I'm still pretty new to the honda scene but I believe you would need to do the dpfi>mpfi swap and yes you can upgrade to obd1. You can search through some of the forums and find some good writeups on how to do both.
https://honda-tech.com/honda-crx-ef-...-easy-2889205/
This is a pretty decent mpfi swap write up.

 

if you have a skunk2 manifold you CANNOT be still running DPFI...

what ecu are you using currently?

 

You need to convert your harness to MPFI and for a 4-wire O2 sensor. You'll then need an OBD1 ECU and distributor. You can run low impedance injectors (from an OBD0 engine) if you use the resistor box, or you can use OBD1 high impedance injectors if you remove your resistor box. There are lots of companies that sell jumper harnesses to make the rest plug and play. RyWire is one of the more popular companies.
There is a lot of information on here about OBD0 to OBD1 conversions if you search.

 

can I use an OBD1 distributor off of a civic? would that fit? and aren't OBD1 distributors for vtec? would that even be compatible with my engine?

 

I have a Pm5 or Pm7 ecu i cant remember which though. whatever comes stock in a dx crx.

 

To put a manifold with 4 injectors you need to convert to multi point. You will either need to get a later pm6 ecu and chip to run turbo edit if you want to go turbo. Or you will need to obd1 convert which will require multi point anyway. the obd1 will require an obd1 ecu from a d15b7. this also all in the FAQ. i recommend reading it all before going any further.

 

doesnt multipoint only vtec engines? or is that not the case? I have a lot of questions haha. I want to make sure I do this build right.