Twin injectors per cylinder.

[Himmelkat]

Preface: Please don't crap up my topic with your opinions on why i want to to this, your views on how unnecessary it is, or literally, anything else but exactly and only intelligent responses to that for which I am looking for an answer. Also, don't bother gibbering and shrieking about what you think of the idea.


I want to experimant with two injectors per cylinder.

What I want to know, factually, not opinions or guesses about my deep-seated motives, is the following:

Can the Diablosport PCM handle the precisely one-half impedance and precisely double current draw of two identical injectors on the same circuit that formerly handled one?

If there is a separate and external driver that the PCM signals to trigger the injectors, then can IT handle the increased load?

If there is a separate driver that triggers the injectors, can IT be twinned so the PCM signals them both, and that signal will obviously have half the impedance and double the current flow of the prior signal?

I will be running separate fuel rails for both sets of injectors, most likely.

[MagsTuning]

What's the reasoning behind this? If you're wanting the secondary injectors to spray once say a determined boost level has been reached the PCM isn't capable of this. If you're wanting both injectors to spray simultaneously at best you'll get is a piggy pack signal to tell the secondary injectors to start spraying.

[mikel]

Yeah, no way this is going to work (easily) with any OEM PCM.

[Himmelkat]

I ask again:
Can the Diablosport (or any) PCM handle the precisely one-half impedance and precisely double current draw of two identical injectors on the same circuit that formerly handled one?

I am just seeing if the lower impedance and double current draw of paralleling a second set of injectors (one off of each of the eight existing injectors) Considering it is not much current or voltage to start with, I can't see the engine freaking out if it perceives that the current draw has just doubled on each injector's circuit, as, evidently, injectors are 12V constantly and the PCM grounds the one lead temporarily to fire the injector, then back it goes to 12V

My motive, obviously, is to see if a second set of injectors will be able to handle double the flow of a single set, or if a second set will add an additional amount proportional to its size increase or decrease versus the first.

WHY I want to find this out isn't as important as the actual physics involved.

I am cognizant of the fact that some people are mystified as to why I would want to try this, but, hey, let it remain a mystery. I know higher-flow injectors exist.


If the current flow at the injector is about 0.2 amps, then the current would double to 0.4 amps. That is the only change. I only plan to hook up as many wires on the second set as will move the injector "piston." I am not putting them in series, but in parallel.

I say again, my motives are not the question. Just whether the injector circuit can handle the additional current flow/lower impedance at the same resistance.

However, if people just don't know. I guess they have never tried injectors with half the impedance before. I know there are higher- and lower-impedance injectors.

I quote from the 'net:
"The impedance of a fuel injector is measured in ohms by an ohmmeter. Injectors can be classified into two categories: high-impedance and low-impedance. High-impedance injectors typically range from 12 to 16 ohms of impedance, while low-impedance injectors usually range from 0.7 to 5 ohms"

Evidently, going from 12 to 6 ohms will not be the end of the world, or from 16 to 8.

[mikel]

IMO the pcm will not like it, any change to resistance and voltage draw is going to be an issue.
Gonna be tough to find the answee to this without finding someone intimately familiar with the injector drivers in the pcm and the control required to make it all work in the software.

Obviously there are multiple aftermarket pcms that can control dual injectors.