I've read that if you are using a OBD1 p13 ECU with a OBD2 motor that you should use the OBD1 injectors, because that's what the ECU is looking for. I wanted to know if this is true or not, I know if you run a chipped ECU (P28) It wont make a difference because you set the injectors size when chipping the ECU. But with the p13 which is not chip-able is it needed to run the OBD1 injectors?

 

Yes you do need to run OBD1 Injectors if your a running a p13... You also should be running an obd1 dizzy because it has a sensor in the dizzy where as the obd2 has a crank angle sensor right behind the timing gear on the crank...

Edit: The reason you have to switch injectors is because obd1 are 345cc peak and hold(resistor box) and obd2 are 290cc saturated(no resistor box)... Hope that helps...

 

yah, its true

 

You may also want to lower fuel pressure by means of an adjustable fuel pressure regulator. The OBD2 injectors are run at a higher pressure than the OBD1 injectors, due to their smaller flow capacity.

About the distributor issue, I currently run an OBD2 motor with OBD1 ECU and injectors, but I'm using an OBD2 distributor. seems to run fine...

am I missing something?

 

I currently run an OBD2 motor with OBD1 ECU and injectors, but I'm using an OBD2 distributor. seems to run fine...

am I missing something?

Bump for more answers

 

does this apply to b series as well as h series? i was under the impression that a obd2 b series would run perfectly with a obd1 ecu (p72) assuming u used a obd2 integra engine harness...

https://honda-tech.com/zerothread?id=1111508

 

I'm pretty sure this issue is an H series thing. OBD1 H22's got peak and hold injectors that run at a lower impedance and therefore require a resistor box. 1997+ OBD2 H22's got saturated injectors that run at a higher impedance (no resistor box). The injector pulses are timed slightly different on OBD1 ecu's than on OBD2 ecu's.

Didn't you get an answer to this question in that thread you linked to?

 

[QUOTE=Sam1am26]Yes you do need to run OBD1 Injectors if your a running a p13... You also should be running an obd1 dizzy because it has a sensor in the dizzy where as the obd2 has a crank angle sensor right behind the timing gear on the crank...

Edit: The reason you have to switch injectors is because obd1 are 345cc peak and hold(resistor box) and obd2 are 290cc saturated(no resistor box)... Hope that helps...[/QUOTE]

In regards to the dizzy, it wouldn't make a difference on a OBD2 JDM motor because the motor doesn't have a crank angle sensor. So using the JDM dizzy would be ok. So in my case I would only need to get the OBD1 injectors and clips and resistor box correct?

 

first of all the ecu dosent care what type of injectors are in it what ever injector you run you need will tell you if you need the resistor box or not.For example, when you have an h22 in a civic or integra, and you decide to run a p72, you still keep the same injectors in it you don't run the gsr injectors.See the ecu can't tell if the injectors are low or high impedance.So no you don't to have to run a certain injector with the ecu but if the injectors are low impedance then run a resistor box because if the resistance on the injectors or different then they are supposed to be thats when you start having problems and buring things up(ecus, injectors)

 

Wow... The reason you are supposed to use injectors that match your ecu is because if not you will be running lean or rich... Of course you can hook a p72 up to a h22 and it will run, but it will run like **** for several reason and there are even posts and dyno charts in the prelude forum that prove it...
And if obd2 JDM motors don't have a crank angle sensor then no you don't need to switch the dizzy...

 

my motor is a USDM H22A4 from a wrecked 2000 Prelude. I'm currently running a USDM OBD1 P13 ecu with OBD1 injectors in combination with my stock OBD2 distributor, and it seems to run fine.

sound weird to anybody?

 

bump for an explanation of why my OBDII distributor will not work properly with my OBDI P13 ecu...seems to work fine