I sent off my injectors last week to be cleaned by WitchHunter (fantastic service FYI), and upon return I learned something which I think is going to be a problem.

2 injectors are low impedance violet tops and 2 are high impedance red top. Given the flow test it looks like the reds are 550's and the violets are 460's....

To my knowledge the 88 Turbo II came with all 4 550's did it not? What do I need to do now to set myself up for success? I believe it's common to use 550 primaries and 720 secondaries, if that's the case I'll have to sell off these 460's. Could any damage have been done? The car ran half decent, definitely with a misfire though.

 

Update:
After digging around in the car I learned that the engine harness is for the center notch injectors (87 turbo). There is evidence that the engine harness has been removed/replaced. However, there is no sign of the resistor box or its harness. How is this possible? Wouldn't an 87 harness have the resistor box/harness?

 

If the injectors are HI impedance and there is no sign of an injector pack then that is good.
The N332 and N333 Ecus look for HI Impedance anyways,so really you only need a resistor pack if the injectors are LO impedance.
Now 550's..Yes..any 550 HI impedance injector(for an FC) with it's appropriate connector will work for you.
If you put on 720 secndaries you have to control that fuel,as the Stck Ecu cannot.
Look at some sort of aftermarket Ecu Such as an RTEK to do that,Or go to a standalone system such as Haltech,microtech,Megasquirt,etc..many to choose from,your choice.

 

I currently have an Rtek 2.1 waiting in my garage. My concern is why does my 88 have an engine harness which has center notch clips? Also, these were actually installed in the car and it was driven like this with the low impedance 550's...that's how I bought it.

 

The 88's all came with high impedance fuel injectors. The 460's you have are 1988 N/A fuel injectors. Sell them and get what you need. Having the flow test results may help you sell them pretty easily. (Witch Hunter always comes through. )

If you have an '88 harness and you want to run four stock fuel injectors, you need four high impedance, purple, square injectors. Those are ran; harness with no solenoid resistor pack. If you plan to buy some 720cc fuel injectors... Be sure to purchase high impedance fuel injectors.

If I have fuel injector clips that will not fit, I shave the notch off of each fuel injector. I only do this after sending them to Witch Hunter to be flow tested and cleaned, so that I know whether or not I can use them.

 

The clips in the car are square, but center notch. The 88 should have been square offset notch correct? I believe finding high impedence center notch is going to be hard to come by, since the center notch injectors were all low impedance right? I guess I will just have to shave the notch.

What were you saying about the harness with no resistor pack? Were you saying it's rare to have center notch with no resistor pack wiring?

 

this help at all.?
.......................
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 to note that the 88 N/A harness came with no resistor pack.You said the harness was changed.Could that be why you now have no resistor pack?

 

I've been using this as reference, Rotary Resurrection tech? What confuses me is my low 550's are purple and have the center notch, not tan as listed.

I see evidence that the harness may have been changed/removed, but don't know 100%. My injector clips seem to be grouped how the factory TII harness does, 1 primary and 1 secondary per rotor. The n/a groups both primaries and both seconaries to my knowledge. It still confuses me that my clips are center notch, even if it was an 88 n/a harness it should still have the offset notch for the high impedance injectors, correct?

This car is an 88 TII 10AE, and the motor has been rebuilt. Unfortunately is looked like a hodge podge of parts were used so that's why I'm trying to sort through this.

 

I don't really remember where the notches are or which harnesses have whichever notches... None of that matters.

All you need to do is use the proper injectors. Who cares about the color, notches, etc... All you need to be concerned about is having four 550cc high impedance fuel injectors.

 

Well that is all Hunky-Dorey then that they WERE installed and the car was driven like that.But who is to say that it was installed Correctly if you are finding out NOW that the injectors are not only the Wrong Impedance but the Wrong CC Size too.???It may drive but for how long?
Focus: HI impedance injectors and NO resistor pack.
can you shoot some pics of the engine harness and put them up?
By the way,you can't use the Violet 550's if you have no resistors.The Flow sheet says they are LO Impedance.

 

^ I am confused. In his initial post he wrote...

 

I should have clarified, I'm expressing concern that the car was driving with these injectors and wonder how the ECU didn't fry running the lows with no resistor pack. I am now fully aware of not being able to use these injectors and have no intentions to. I will gladly take pictures of the harness tomorrow night and report back.

 

Typo

 

I can show tons of S5 ECU threads that the Ecu has given out,but honestly can't recall a S4 TII being harmed.
I ran an Rtek with some Primary HI's and Secondary LO's,but I had the NA harness with the resistor pack and I used "half of it",and bypass the other half.The Impedance varied by 4 ohms but the Car worked fine.
Now,I am not saying it was a good thing to do,but It was in transition,going to another setup..so Temporary.
When you do post pics,try and get shots around the AFM area,so that it shows the "NO Resistor pack wiring".
I am thinking that the wiring is an 1988 N/A harness.They had no Resistor Pack.

 

Pictures as requested:
Front passenger corner of engine bay. Pictured should be the fuel pump relay and resistor. No unused harnesses/connections.

Center notch clip.

Picture showing the grouping of the injector clips.

What is this 5th connector?? I don't remember disconnecting it from anything. It is the exact same connector as the injectors, it branches off the harness with the o2 sensor lead as shown.

 

Your injector clips are aftermarket and it looks like someone has rewired the harness. Shrink-wrap everywhere.

Keep your purple low impedance 550cc injectors to use as primaries, buy some aftermarket low impedance 720s, wire four 6 ohm, 10-20 watt resistors, and then upgrade the ECU/replace it to control them.

 

That's really not factory loom/clips?

Any ideas what that 5th clip is for?

 

RR88 is right,they are not Factory clips.I actually like that New style as you just have to push the clip and it holds.
The old style was a pain to get off,so really thank whoever put the new ones on for you.
I can't tell what the other "5th clip" is for,sorry.

 

The BAC uses an injector-style clip, and the location is correct too. I'll bet it's for that.

 

Ah, thank you sir. I could have sworn I looked at the BAC, but I could have definitely missed it.

 

my clips do not look like that i have a 1991 t2 s5 fc3

 

Either that or the water thermo sensor on the backside of the waterpump housing. It's just process of elimination. Hint: The BAC's wire colors are L/G and B/W. The WTS's wire colors are Br/B and G/W. Check for those colors lower down from that connector.

 

S5 uses oval clips.