resistor wiring

[jdmser]

I just wired in the 10ohm ballast resistor to run the high impedence injectors in the rb20. After doing so I found that the resistance across the injector and resistor was not 10ohms + 2.7ohms but, more like 4.8 ohms. I believe this is due to the injectors being batch fired in groups of three. The sequence is 1-3-5 and 2-4-6. So if this is right to find the resistance that the ecu sees you would measure resistance across the injector and divide by three? This turns out to be 4.9 ohms, very close what I measure across the resistor pack and injector. Can anyone confirm this?

[Carl H]

6-10ohms resistance will be fine, just make sure every injector power wire gets its own resistor.also this is seqential injection not batch fire, so it fires in sequence.

[jdmser]

Any idea why I would be getting continuity in between the two groups of injectors mentioned above? I thought I shorted something but, when I unplug the ecu I get 13ohm across the power wire and injector ground. When I plug it back in the resistance drops to 4.8ohm. The only way that could happen is if the ecu was creating parallel circuits by grounding groups of injectors together or is my ecu screwed? Or are all the injectors grounded when the ecu is off?

[Carl H]

now you've got me, how did you wire the resistors in?

[jdmser]

I have one wire going to six 10ohm resistors. Then one resistor going to each injector on the power side. The readings I was geting was with the power wire not yet hooked up from the resistors to the harness. I double checked the wiring with Roy's DIY on SAU.

homemade resistor box