low to high impendence injector help

[shift_240]

so don't bash me on this thread cause I already used the search and I found useful info but from 2007 and no pic with them. im more a visual learner anyhow.


so I have a ka24et and trying to upgrade my injectors to dsm 450cc pulled from a eclipse. I know they are low impendence and I need high impendence.
I found this through my search.
http://zilvia.net/f/archive-faqs/133034-how-add-resistors-low-impedence-high-impedance-injectors-approved.html

but this shows how to make your own box. im wondering if there is a box I can already use to run the injectors. also if there is another write up with pics or has anyone ran these and the results. please helpppp thanksss

[xpertsnowcarver]

Go to radioshack and buy four 10 watt 6 to 10 ohm ceramic resistors. Depending on how low your impedence is, choose the resistor that is approximately close to equal your original impedence.

I used MSD 1000cc injectors that are 2 ohm. I used 10watt 10ohm resistors from radioshack (less than $2 each..) and had no problems with idling or racing.

[shift_240]

so do u splice into the injector wiring. does the resistors run through one wire or both? also i got the pigtails with my eclipse injectors do i use those or stay with stock?

[shift_240]

bump for help

[di-devol]

Pins
101
103
110
112

Double check that to be sure. I think you find these wires and run a resistor in-line on these wires.

[tapdeznutz]

great info, i was looking for this exact info.

[GroundPerformance]

... You actually need to run the inline resistors on the positive wires and not the individual signal wires.

[tapdeznutz]

... You actually need to run the inline resistors on the positive wires and not the individual signal wires.

how would one determine which wire is the signal wire? :)

[di-devol]

The ones I listed were the grounds, I apologize for being incorrect.

[codyace]

Take the 4 injector drive outputs from the ECU, and solder the resistors inline. There isn't any other way to do it, as the injectors all use the drive/power signal, and a common ground.

[xpertsnowcarver]

You're killing me guys.. The information is now confusing. All answers are found by simply looking in the FSM under EC - Engine Control under Injectors... This goes for any S13, 14, or 15 FSM and is free by simply searching Google for Nico Club or Phase2 or whatever.

so do u splice into the injector wiring. does the resistors run through one wire or both? also i got the pigtails with my eclipse injectors do i use those or stay with stock?
bump for help

There are four injector wires leading to the ECU. Wire one 6.8ohm to 10ohm (depending on the resistance you're trying to achieve) to each of the four wires. Yes, this means cutting the wire apart, then SOLDERING the ends to the resistor. Don't just twist and tape them together.

Pins
101
103
110
112

Double check that to be sure. I think you find these wires and run a resistor in-line on these wires.

Double check your pertaining FSM to make sure the pins are correct. Or, you can simply match the color of the wire at each injector to see if it matches the pins mentioned here.

... You actually need to run the inline resistors on the positive wires and not the individual signal wires.

Jonathan, that is not correct. The injector drivers are current driven (similar to that of a sound system amplifier) (usually about 1-1.15amps in this case). It would not matter if the resistors are on the positive or negative side of the injector because the ECU merely sees the overall resistance of each circuit/injector. The only necessity is that the ECU MUST SEE the equivalent resistance it was designed for, or else you will burn out the circuit in the ECU. (Just as one would if they used the wrong impedence speaker setup with the wrong sound system amplifier.) Therefore, putting the resistors just before the ECU is adequate enough. And yes, they must be wired in series.

how would one determine which wire is the signal wire? :)

See the FSM and look at the injector schematic/wiring diagram.

The ones I listed were the grounds, I apologize for being incorrect.

Correct, they are injector ground triggers.

Take the 4 injector drive outputs from the ECU, and solder the resistors inline. There isn't any other way to do it, as the injectors all use the drive/power signal, and a common ground.

We should stick with the common terminology of "in series" or "in parallel" in order to maintain clarity and consistency. The injector ground is not common, only the power is common (via a 10amp fuse - side note: also part of the ECU IGN Signal). Injectors are grounded individually by the ECU, triggered by the timing measured by the CAS.

Here is the S15 injector wiring diagram:
http://i1166.photobucket.com/albums/q606/xpertsnowcarver4/s15injectorschematic_zps4caac8f7.jpg

[codyace]

Too many Makers Mark's tonight! Yowza.


Totally spot on, the signal from the ECU is a grounded one (much like most signal type things from it).

In practice I've always put them just after the big main connector for both protection (not in engine bay) and ease of service if need be.

My fault there woop!

[godrifttoday]

You can do it like everyone else saying or

Step 1 go to junkyard and get civic/ dsm resistor box.
Step 2 find where the 4 injector red wires meet and turn into 1 and cut ( on main engine harness by idle air control valve)
Step3 the 4 wires from the oem harness that come from the injectors go to the resistor box.
Step 4 the one wire that leads to where the 4 wire split goes to the resistor box (the one with a different color on the reister box )

[codyace]

You can do it like everyone else saying or

Step 1 go to junkyard and get civic/ dsm resistor box.
Step 2 find where the 4 injector red wires meet and turn into 1 and cut ( on main engine harness by idle air control valve)
Step3 the 4 wires from the oem harness that come from the injectors go to the resistor box.
Step 4 the one wire that leads to where the 4 wire split goes to the resistor box (the one with a different color on the reister box )

I've always thought would be a slick way to do it, but never have been to find one at the pick n pull when I go for them.