rx7vadim

I have a ms1 with vr2 circuit and ignition control, can the ecu control high imp primary inj, and low imp secondary inj?

Rotospeed

iTrader: (8)

if you use resisters for the low imp injectors you will be fine.

camman

I'm doing it. I just use 10 ohm resistors on the low z injectors.

rx7vadim

ok, i guess i can use the rx7 s4 resistor, thx.

Jobro

iTrader: (2)

depends on the injector.

Measure the injector with a good multi meter. If you put a pair of 4.5 ohm injectors onto the 2nd injector driver, I have proven they can work just fine.

#1 They are secondaries so most of the time they are not used.
#2 By that time there are 4 injectors so the duty cycle is lower if you used big secondary injectors
#3 You can set the staging settings to make sure secondary injectors are not used until you absolutely need them ie until you hit 85-90% duty cycle on the primary injectors
#4 When the injectors are in use they are still subject to the pulsewidth in your fuel map so its not like you are putting a short circuit on an injector driver not designed for it they are an inductive load and it takes time for the current to ramp.