Okay so I'm running stock s5 primarys and got 2 low imp Delphi 1000cc injectors as secondarys. Would it be easier to just add some resistors to the secondarys and save money or buy some ID1000s? If so how exactly do I wire them in? All this is going into a 88 turboII which I'm in the middle of swapping in a haltech sprint re ecu and harness. Please feedback would be great cuz I would rather save money with resistors if I can than buy new injectors

 

Dont wire resistors for goodness sake. Get the clips and pins necessary for the injectors and crimp it on.

 

Find your self some newer injectors. Stock injectors are from the 80s and technology has evolved since.

 

My primary's are stock. I'm talking about my secondary injectors. They are Delphi 1000cc low imp. Where can you get resistors and how do they wire in?

 

Woah.
Don't start mixing and matching your resistor impedance to compensate for what the Ecu needs By adding Resistors..
On a Haltech setup you are just asking for Disaster.
But hey..you would know this if you Read info in the HALTECH section..I'll even send you a coupon for Free COFFEE!
Do it RIGHT!!..get all FOUR with the same impedance,Preferably HI impedance.

 

Yes! ^

 

What's so bad about adding resistors? Isn't that what all rx7s did prior to 88 models?

 

Post link to where it says that in the haltech section cuz I can't find it

 

Are the impedance of the primary injectors high or low?

 

You can use all low or all high impedance, but if you try to mix/match even with resistors, you're going to wind up with bizarre interactions which will make the ECU very unhappy. I don't know for a fact, but I'd be willing to bet that the resistor pack Mazda used had more than just resistors in there.

 

In the middle of 1987 Mazda switched to high impedance from low impedance (so, early S4's had low and late S4's had high). You likely have high impedance primary injectors. You can basically tell by the color of the injector wires which run to the ECU as Brown means low impedance set up while Green means high impedance.

 

Yes I have a 88 turbo2. My primarys are stock high impedance but my secondarys are 1000cc Delphi low impedance. So it's not a good idea to just add a resistor to just the secondary's to bump up the ohms because you have to have 8+ohms to control them with the haltech sprint re

 

"Resistor" meaning to resist. Using it on your 1000cc will not bump up anything. Instead, itll lower them. You need different injectors if the ecu calls for high impedance injectors.

 

Series wired resistors increases circuit impedance; he would not be placing them in parallel to the injectors.

The ecu only cares that you don't put excessive current through the injector drivers. There are 3 ways to do this:
1) peak and hold
2) high impedance injectors
3). Low impedance with series wired resistors.
Early series 4 did 3), and late s4 and s5 did 2).

So you can do the same. It will work just fine; just make sure you have one resistor per secondary injector.

I wouldn't mix and match high impedance and low impedance wth resistor on the same driver.

 

Nope, just a 5 wire connection. 1 power coming in, split to 4 resistors, and 4 wires going out, one to each injector.

 

Youre absolutely right. I dunno wtf i was thinking.

I did this same thing when i bought an AFC NEO once and wired them up next to the upper manifold. I dont suggest it because once i when went standalone and unwired them, they looked pretty toasted. Now i just dont like a connection before a connection. But thats just me i guess.

Here the pics OP.

https://www.rx7club.com/2nd-generati...wiring-766262/

 

I think the thing that should be pointed out though is that HE won't be using the stock wiring setup anymore and will be setting up the wiring for the Haltech.
Now..Why add Resistors to the wiring?.

IF you use 4 injectors that are the Same impedance you do not have to add resistors or solder this and that just to add some "odd ball" injector.
You just select the injector Impedance in the ECU settings and run that impedance range of Injector.

(I'm not doing YOUR research for you ..it's IN the Haltech section.)

By using the Wiring and connecting FOUR Same impedance injectors you STILL have the choice of changing to all four LO or all four HI.
Anyways the half the point of going to an aftermarket ECU is to get rid of the 25 year old **** wiring anyways!

 

Exactly.

Im aware people come here for help but reading his type of questions (like this one)

i suggest that he gets the right impedance injectors and skimp on low impedance. Those 1000cc are still worth money and you can put that towards the right injectors. No reason to do something kinda "hackish" to make work when you dont know how to do it. Get it right the first time and have one less possible problem.