Powerpack

Does anyone know what impedance the injectors of NA '86 should have? I know they actually have about 2 ohms on mine. But according to the factory manual they should have between 12 and 16 ohms. In Haynes manual, it's 1.5 to 3 ohms. I figured that the factory manual is most likely to go with NA '88 specs, right? :dontgetit:

1Revvin7

86-88 low impedance

89-92 high impedance

Powerpack

So there's an error in the factory manual, page 4A-70 (fuel and emission control system). I hope that's the only thing wrong. :dontgetit:

13BAce

There should be a resistor pack near the airflow meter. When the resistor is wired in the impedance is in the factory range.

13BAce

86-early 87=low impedance injectors+resistor pack

late 87-91=high impedance

Powerpack

Thanks Ace, that's what I was figuring out since they don't say anything about those resistors in the factory manual. And it really is the 1988 manual.

13BAce

No problem.

Infini IV

So can I put 13Brew secondary injectors into my 1990 T2?

Powerpack

You probably could do that but you should add the resistor pack in order to keep the total impedance to about 14 ohms. I think high impedance injectors might have a faster response since the injector system draw the same amount of current. With low impedance injectors (injector + resistor) , it is activated with about 2 volts only (11 volts in the resistor). So the energy going to the injector is about 7 times less.



All this is just a theorical explanation from an electrician (myseft). That could explain why they've change for high impedance injectors. At 7000 rpm, the injection cycle is less than 10ms (2 times shorter than a piston engine at same rpm). So it could be interesting to see the difference in performance or fuel economy. ???



I might add that I don't know anything about your 13Brew injectors, they may need more current to activate them so maybe you won't use the same resistor. You need the resistor to limit the current to nominal current needed by the injector. You need the specs of your injectors and the nominal ECU output current capability.

13BAce

They won't bolt right in because they're side feed injectors. FC fuel rails are for top feed injectors. If you got them with an FD secondary rail and modified it to fit then you could do it.