The question is does the s4 model rx7s have a resistor so that you can use the high imp injectors on a low imp ecu.

 

Yes, they have a resistor pack. To use high impedance injectors on a S4 (low impedance) ECU you need to remove the resistor pack.

And to use low impedance injectors on a S5 (high impedance) ECU you will need to use a resistor pack.

 

Let me get this straight.

To use S4 high imp injectors on a low imp ecu you have to. REMOVE THE RESISTOR PACK.

To use the low imp injectors on a High imp S5 ECU you have to. GET A RESISTOR PACK.

 

Anyone please I need to know right away.

 

S4 = low
S5 = high

if it's going into a S4 the resistor pack is already wired into the harness.if the resistor is left in place it will run low imp injectors which came w/ the car originally.

 

Dude. The s4 injectors don't need the resistor pack for your car. All we have to do is wire around the resistors (direct wired). Simple.

 

Are you trying to use high resistance injectors (11-12ohms) on a early series four car that had low resistance injectors (2-3ohms)?

Or? What?

 

I gave him some s4 TII 12-ohm 550's and I think he's using his s4 ecu. I'm not sure which number ECU he's using though, perhaps he will chime in with that.

 

Then if he has a early 1987 low impedence injector car, all he has to do is go to the solenoid resistor package, remove it from the harness, then cut the pigtail of the solenoid resistor package in half. PUt the resistor package in the doghouse out back. Take the remainder of the pigtail, and solder ALL FIVE OF THE WIRES together and cover with shrink tubing.

Then reinstall the pigtail with five soldered together wires back to the EM harness. He's through. Done. Fini.

 

I've got a question... It is possible to use stock low imp injectors from an S4 and then use 720cc high imp for the secondaries on an s4 ecu?

 

If the car was a early series four that came with the solenoid resistor package, you'd just determine which of the five wires in that package are for the secondarys, then cut just those two wires in the pigtail, and somehow splice /solder them to the one wire of the five wires that is the 12vdc feed wire. You've just bypassed the resistor package for those two wires and are *good to go*.

The injector plug will be different for the high injectors and you'll have to find an electrical plug that will fit the new injectors.

Of those five wires in the solenoid resistor pigtail, one is power from the Main Relay. The other four go to the individual injectors. The power wire feeds the four others.