I've heard some people say that you'll have greater tuning options using OBD1 injectors (High impedance) vs OBD0 injectors (Low impedance).

This seems counter-intuitive, since pretty much all higher flow-rate injectors are low impedance (you would want MORE tunability with larger injectors).

Am I correct in assuming that the only difference between low and high impedance injectors is that high impedance injectors have resistors built into them whereas low impedance injectors do not (which is why they require a resistor box)?

Just trying to clarify this.

I'm in the middle of swapping a D16z6 into my 91 EF Sedan and I was about to grab some OBD0 injectors (since all my injector clips are OBD0).

I did this on my other z6 swap (with a P28 ECU) and kept the resistor box and everything worked fine.

 

in a d series setup, no difference really. the market has gone to the newer style injectors though which are all high impedance.

 

OBD0-OBD1 doesn't matter witch one you use other than injector connector compatibility.There are OBD1 & OBD2 Low Impedance injectors as well. The 92-95 Prelude 345cc injectors are low as well as the 90-97 Accord 240cc injectors.

Not all higher flow rate injectors are peak and hold ether. Not sure where you are getting that information from.

To be honest with you the stock Honda peak and hold/Low Impedance setup using saturated drivers and an external resistor box isn't the best way to fire a true peak and hold injector. If you are really concerned about getting the most from your P&H injectors you should look into a real Peak and hold injector driver circuit.

Biggest thing with tuning injectors is to have them flow balanced and try and get all the voltage offsets and flow specs about them that you can. This will help you finer tune the injectors evenly.

A lot of people are actually moving to using newer style injectors that use a disc style nozzle with a 4 hole misting type injection vs the older pintle style single jet spray pattern.

 

Gotcha. Well, for now I'm going to use some old stock Low impedance injectors and the factory resistor box until I finish building my boost motor.

And it's been years since I've worked with big injectors, and back then, most of what you could get was low impedance.

I'm glad injector tech has advanced though.

Thanks for the info guys.

 

yeah it's about time the Honda automotive sector caught up to the 90's motorcycle injector designs. I had a set of '98 GSX-R injectors that were using these "new" technologies...lol

 

low impedence peak & hold are the best but there are a few different nozzle options

 

They are not. Honda ECUs are designed to run saturated injectors (obd0 used P&H simply because they were cheap). Adding external resistance delays current, there's no way around it.
That's why ID and RC manufacture high flow saturated injectors, to run seamlessly with ECU drivers designed for them.

That being said, for common setups you won't notice too much difference with a resistor box and a proper tune. That also being said, DSM and RDX injectors have considerable latency and require higher offsets, reducing their top end efficiency (albeit their spray pattern is superior for low end).