ZaZZn

Hey all I'm just wondering a few things about the stock injectors...


I know that 19550-1370 is the low imp 550 ND injectors in the stock 87 TII

Is 19550-1350 High IMP
and which model's come with the 680 cc low imp injectors?

Thanks

Eric W.
BTW if you have any for sale PM me.. will pay 45 + shipping for 4!

13bpower

680's were in the 84-85 gsl-se. anyone correct me if I am wrong.

hypntyz7

INfo Im compiling for my tech section of my new webpage. Someone bookmark this or archive it please.

Injector Information

Mazda RX-7(Gen 1 and 2) Fuel injector identification guide

Note that some injectors carry the same part number as others but plug styles and resistances can vary. Low impedance refers to 2-3 ohms, high impedance refers to 12-13 ohms.

Year type impedance plug style plug notch position flow rating color part number

84-85 13B NT low square center 680cc orange 195500-0900
86-87 13B NT low square center 460cc red 195500-1350
86-87 13B T low square center 550cc tan 195500-1370
88 13B NT high square offset 460cc purple 195500-1350
88 13b T high square offset 550cc purple 195500-1370
89-91 13B NT high oval center 460cc red 195500-2010
89-91 13B T high oval center 550cc purple 195500-2020

As a side note, replacement fuel injector clips(for wiring harness) can be obtained from auto parts stores to replace broken stock clips. I got the parts from autozone:

GP Sorenson part 800-9416 Fuel Injector Connector

More about injector impedances on 2nd generations:

86 and 87 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.

88 and after models used high impedance injectors. 88 HI injectors have an offset notch on the plug, and all post 88 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.

When performing engine/wiring/injector swaps, the type of setup must be noted and kept together. This is easy as LI injectors will only plug into a harness meant for them(due to the position of the plug notch) and vice versa for HI injectors and harnesses. 88 and post 89 HI injectors and harnesses are not interchangeable.

A car that previously ran one type of setup can be changed to the other…keep the injectors and wiring harness together. The ECU will not know the difference.

It is also possible, but not necessarily recommended, to use HI injectors on a LI harness and vice versa:

--TO do so you must modify the injectors to fit the opposing wiring harness by taking off the notch on the plug.

--IF using LI injectors on a HI harness, you must splice into the harness, at each injector lead (for a total of 4) 10 ohm/10watt resistors available at radio shack for a couple of bucks. Doesn’t matter which wire of the 2 per injector you splice to, polarity isn’t an issue here. This bumps the LI resistance up to acceptable load for the ECU to see.

--IF using HI injectors on a LI harness, you must unplug the resistor pack. Next, locate the supply wire in the center of 5 terminals. Bridge jumper wires from this terminal to each of the 4 outlying terminals, which basically completes the circuit without resistors, carrying the HI injectors’ 12-13 ohm load directly to the ECU just as a HI harness would.

13bpower

That is much more complete answer than mine.

88 SE

This one will throw you for a loop...

My 1988 SE

Manuf. 11/87

Red top, cneter tab injectors.

Mazda's "lets put that part only on this car" theory strikes agian

ZaZZn

Thanks very imformative..

hypntyz7

Could be factory, but more likely it's had an engine swap once in it's life(90% of all cars Ive worked on over 120 K have at least once) adn teh PO used an engine from a more common 87 model.

88 SE

Yea i thought that too. I looked into it and my harness is the red top/center tab too. so either the guy replaced teh whole harness or the people at mazda are idiots.

RX7TT88

so does anybody know if i can get some 460cc oval clips for my 89. i need them real bad and i cant find none here in idaho cus idaho is gay but i need them bad and if anybody got some or if u knwo the part # or let me know if i can get them at autozone or shuchks or napa...etc... so in advance thanx to whoever helps out