Hello to all. i am new to these forums but not the car community and just wanted to say hello. This is my 1st integra that i am doing the ls turbo setup on. I wanted to give you all some details and hopefully you all can help out. i have googled it for a bit with no luck but everyone misses things
So i have a 91 Auto Integra GS and a 93 Manunal Integra
Ok to start off i am using the 93 block and head to build up for the turbo setup that i want to do.
Now the 93 is OBD1 and the 91 is OBD0. When i look at the harnesses between the 2 cars i notice that the resistor box is not the 93 harness but is on the 91. If i use the 93 harness is there gonna be an issue with the injectors since that box isnt there? I havent found one on the 93 body yet but maybe its hidding some where?
And Would it be better to use the 93 harness and conversion harness so i could hopefully get a P28 ecu for chrome tuning? Not to mention maybe easyer tuning options?
I know the 93 harness SHOULD match up to the 91. But would there be any draw backs? i really want to keep the 91 Harness with the 91 if at all possible but i understand that may not cause the motors are coming from different years and the OBD 1 disturbtor, 4 wire O2 sensor are the only main differences…If i am missing any pointers please let me know.
The reason the '93 Integra doesn’t have the Resistor Box is because it uses Saturated type injectors… Where-as the OBD0 system uses Peak And Hold injectors. Whatever setup you go with, if you use OBD0 injectors, you need a Resistor Box… If you run the OBD1 injectors, no Resistor Box is needed. More information on injectors and the different types can be had Here
The '93 harness ‘will’ work in the '91, but it is almost ALWAYS easier to use the harness that was made for the shell. I would keep the '91 harness and just do the OBD1 conversion. Colin did an awesome outline of the process Here
If you are building a turbo’d motor, then going OBD1 is almost a necessity. Finding reputable tuners that work with OBD0 systems can be a pain. There are tons more people out there who tune on OBD1 ecus. It not only gives you more tuners to chose from, but also which software to use as well as many different add-ons that OBD0 softwares cant do. Its a no brainer.
Ah ok, that makes more sense. I had a 93 hatch that swapped a H22A1 into and i had to add the resistor box as well.
So keep the peak/Hold injectors with the resistor box and just simply wire up the Distributor and the 4 wire O2 sensor? thats seams pretty simple. thanks for the help. Would you suggest me doing this when i do the 5 speed conversion or just wait till i swap in the motor in to do the conversion?
Actually I swapped harnesses on my 91. I took an entire (full car) harness off of my donor obd1 car. Want as bad as people say and it looks a lot cleaner and there’s no worrying about splicing or where to run new wires. I did it here
Not very detailed but is very straight forward.
you can do the conversion whenever. If you are gonna daily the car then you can do it sooner and get it out of the way, also the engine runs better on obd1(stock vs. stock)
ya this car is not my DD by anymeans. just something to drive when i want and to gradually build up. I might as well do it with the swap of the 5speed to keep it easy