IAN

iTrader: (3)

I have the N332-18-051K injectors

Taken out of my 10th AE 1988 Turbo II I have the 195500-1370 injectors which are the 550CC injectors for the 1988 13BT. (red top)

Funny thing is that my spare 195500-0900 (Orange) which are the 680CC 13BT injectors connect. Also my ford 1600cc's (baby blue)

So my 195500-1370 (red top) 550's do not.

What gives. I bought this harness new from mazdatrix and specified 1988 Turbo II. In fact the part numbers to match saying that the harness is from a 1988 Turbo II?

Help?

RXSpeed16

iTrader: (41)

Part #N332 on the harness means it's supposed to be used with low impedence (center slot) injectors. #N333 would match the N333 ecu used for high impedence injectors (offset slot).

To confirm this, does it have the 6-pin plug for the resistor box near the AFM connector? If so, it's meant for low impedence injectors.

Looks like you got an early 86-87.5 instead of the 87.5-88 harness. You can fix it by swapping in the correct injector clips and jumper the injector resistor box plug. Functionally they are identical other than those two items.

IAN

iTrader: (3)

WTF. I didn't spend $1200 to cut anything. Thanks for your info.

Here is what is connected beside the AFM connector.

IAN

iTrader: (3)

If this is the resistor pack (See picture) then no the harness does not fit this and this item came of the car. Called Mazdatrix and matching my serial number this harness is supposed to be the correct one. Something odd. So this picture does not fit nor does my injectors.

The 195500-1370 red tops are 12.8ohms.


Information on injectors I just found.
Inector Information


More about injector impedances on 2nd generations:
1986 and 1987 model cars used low impedance(2-3 ohm) injectors. Low impedance injectors have a center notch on the plug. The wiring harness used with LI injectors integrates an injector resistor pack, wired inline between the ECU and injectors(under stock air box) to bump overall load seen at the ECU to 12-13 ohms.
1988 and later models used high impedance injectors. 1988 HI injectors have an offset notch on the plug, and all post 1988 injectors are HI with an oval plug(until 3rd generation side feed injectors which are totally different). The wiring harness on these models deleted the injector resistor pacl, carrying the 12-13 ohm load from the injectors directly to the computer.

So my options are?
-Grind the offset on the plug and plug in and do not run the injector load box
-Screw it all and install haltech and hope I can return the harness But have have to pass emissions. (What happens to the duty and hundreds in taxes here lol)

misterstyx69

iTrader: (142)

I got an injector pack that fits pic /post #3 Ian.Let me know if ya need it.
I believe the other pic is fuel resistor relay.???( I could be wrong,I modified my N/A to Turbo,so never worked with TII car wiring.)

IAN

iTrader: (3)

You might be right. I modified my rx7 10 years ago so I can't remember. I might have it. Just need to figure out what it is, What does it look like?

satch

iTrader: (1)

Injector Relay (low impedance). Post #2 pic #5. https://www.rx7club.com/2nd-generati...erence-671004/

IAN

iTrader: (3)

So its the little round thing with a l and r adjustable pot. That does connect to my harness but doesn't explain why I have 12.3ohm resisters. I am assuming my ECU wants high then all I need is to ground the inject off see tab such that it fits my harness?

j9fd3s

iTrader: (3)

if you look up the part numbers, there were the 87 style with the resistor and the 88 without, and at some point Mazda only supplies the 87 style one, which is actually better.

it makes it much easier to run low impedance injectors later

IAN

iTrader: (3)

Not sure what part numbers to look up. The harness part number that i supplied is the one that is supposed to go with my serial number of the car. My car has high impedance injectors which do not fit the harness.

IS this the resistors for the injectors?

misterstyx69

iTrader: (142)

that is the variable resistor.
you want post#2 picture #5 in this thread.
https://www.rx7club.com/2nd-generati...erence-671004/
..see that little square silver box?That is the injector resistor pack.
above the White connector is a Black egg shaped connector.That connector is off the resistor pack and attaches with The Harness Connector you have shown in THIS thread Post #3.

IAN

iTrader: (3)

Oops. Was looking at the wrong picture at first. Don't remember that resistor pack. Don't have one in my pile will have to go look around. Just odd I have fuel injectors that do not fit this harness and it appears that my harness does have this six pin connector. I'm getting old and blind lol. My ECU is N333 18 881. It may entirely possible I have wrong injectors but not sure how that would happen.

misterstyx69

iTrader: (142)

Now if you run that harness and have LO impedance injectors you can plug in the Resistor Pack,and use the LO's.
IF you use that harness and use HI Impedance injectors,Instead of Mucking up a Brand new harness,you can take the Resistor pack wires,make a big Pigtail out of it, and Connect ALL of the wires together and that will in effect make a continuous run to the Injectors.(so no resistors are used,at all.NOT needed for HI impedance application).
OH..answer this: what injectors do you have?..(Do not KNOW?..here!)
What size injectors does my RX-7 use? What colour are they?
Year Engine Plug Size Colour Part #
84-85 13B NA, low square center, 680cc, orange, 195500-0900
86-87 13B NA, low square center, 460cc, red, 195500-1350
86-87 13B Turbo, low square center, 550cc, tan, 195500-1370
88 13B NA, high square offset, 460cc, purple, 195500-1350
88 13B Turbo, high square offset, 550cc, purple, 195500-1370
89-91 13B NA, high oval center, 460cc, red, 195500-2010
89-91 13B Turbo, high oval center, 550cc, purple, 195500-2020
................
also additional Info.It doesn't matter if you have an N333 Or an N332 ECU..they both will See HI impedance in the long run.
One uses resistors inline with LO impedance injectors.... and the other doesn't use any resistors but uses HI impedance injectors,so Really you can use either ECU and not have to worry.

RXSpeed16

iTrader: (41)

I apologize, I think I steered you wrong there. I was thinking about the fuel pump resistor relay that has 6-wires. I am not sure about how many the injector resistor box has. I've never messed with it before.

It looks like you have the right injectors for an '88 turbo. However the '88-specific harness isn't available any more, so you got the '87 version. This was Mazda's decision, not just Mazdatrix.

Options for using your nice new harness untouched are:
-Grind off tab on current injectors, jumper wires normally going to resistor pack.
-Source center-tab, low impedence T2 injectors and buy a resistor pack.

IAN

iTrader: (3)

Thanks guys. I have the high impedance objectors 13.8ohms.. Red square top offset tab 1370's. Will do as you say. Grind injectors tab off jumper out injectors resistor pack.

misterstyx69

iTrader: (142)

Ian,lmk if you do in fact need a Resistor pack as I would have to hunt for it.I got one,maybe 2,and I know one was altered to run 2 lo's and 2 hi's ,so that one would be great for you just to Cut and crimp sort of thing.

IAN

iTrader: (3)

Thanks! Will let you know. Will have to dig through a few boxes.

misterstyx69

iTrader: (142)

The trick is to use just the Pigtail of the resistor pack if you do this.
That way you do not touch your brand new harness.
Harness plugs into terminated pigtail..done.

Casual_John

iTrader: (8)

Hold on Ian, before you grind anything.
I got 4 low impedence 550cc turbo square tan injectors with the center notch. Is that what you need?
PM me if it's not too late.