okay i just got done doing a little searching, and i've noticed a few posts saying that you CANT use the rtek 1.7 turbo vers. ecu if you've retained your NA harness.

i swapped in a streetported turbo motor, but i used my NA harness, since it came with high impedance injectors, and the 88.5 high impedance turbo harness.

so are these statements true? do i really have to switch harness's just for the rtek 1.7 ecu to work? i know ill need an safc to tune the 550/720 LI injectors.

 

While your waiting for someone to answer you, can you answer this question: Are you using the non turbo EM harness on the engine? Or not?

 

yes im using the non turbo engine harness.. i bought a swap, and found out it was an 88.5 when i got it to my friends shop. are there different pin locations for the turbo harness/ecu, as aposed to the N/A harness/ecu?

or is it just something to do with the Rtek ecu? im sorry for being not being up to speed with all this ECU talk, but im trying to learn.

id like to retain my NA harness if it will work/can be made to work with ease, being it is in really good shape, and there aren't any broken connectors.


SOMEONE PLEASE CHIME IN.

 

Let's see if we're on the same page. I attach a jpg of the two plugs that matter when comparing the different pinouts b/t a Non Turbo EM harness and a Turbo EM harness for a early, pre June 1987 RX-7.

Just to remove any confusion, the harness on the engine is the EM harness. It mates with the ECU AND also, two ORANGE colored plugs just inside the passengers foot well. The ORANGE plugs mate with the FRONT harness.

Those ORANGE plugs are shown in the attached jpg.

That jpg tries to show the wiring for both Turbo cars and Non turbo cars in one picture. Anywhere in the picuture where you see the wire colors enclosed in a parenthsis, is peculiar to the TURBO cars. The wire colors enclosed in ( ) will replace the wire colors the ( ) is just above. An example is the (LW) just above the BW in the jpg.

On a Turbo car, the LW goes to the boost gauge. The BW just below it is for a non turbo car and goes to the METER fuse or ENGINE fuse if I remember right.

Also the Turbo EM harness does not carry the two small Alternator wires for the alternator. These things can be over come. But it's counterproductive to use the Turbo EM hareness in a non turbo car.

Plus the Turbo EM harness has wires for the Knock sensor and that does not exist on a non turbo EM harness. That said, imho just don't use the knock sensor or its wiring. It's ineffectual imho.

If you use a non turbo EM harness on the turbo engine, there still are some minor changes to make, but not nearly as extensive as using a Turbo harness.

And if your using a 88 EM hareness, then it's for high impedence injectors......and your injectors are ????????? high? low? unknown?

 

But I see your using all non turbo harness. At the ECU, the TURBO ECU, there are just a couple of items that need to be addressed. What you do, is go to the FSM. The FUEL AND EMISSIONS SECTION of that FSM.

You find the pages called CONTROL UNIT that lists all the wires for the ECU and what they do in life. Let me start over. You get those pages for the Non Turbo car and also for the TURBO car. You cross check each wire from the Turbo with the non turbo car. I bellieve you'll only find two...maybe three differences. Easy to correct the differences.

 

There's only three pins on the ECU that are different. 1R, 2K and 3D.

3D is for an inhibitor switch on a n/a and it's for the fuel pump resistor relay on a Trubo. You don't have a fuel pump resistor relay on a non turbo car, so I'd just depin that wire at the ECU plug and cap it off.

2K is for the Twin Scroll solenoid on a Turbo and is used for the Split air solenoid. So what you do, is go to the split air solenoid plug. You depin the wire in that plug that goes to the ECU, and lengthen it so it will reach the Twin Scroll solenoid, and install it in that twin scroll solenoid plug. Oh. I forgot. You need to lengthen both split air solenoid wires to reach the twin scroll solenoid.

1R is for the knock sensor on a Turbo and is used for P/S on a non turbo. I'd just depin that wire from the ECU and tie it back/cap it off.

That's about it. Except you Probably will have to extend the three TPS wires in the harness plug to reach the TPS. Pay attention when you do that so you mate the right wires.

I thru in a jpg of where the solenoids are on the engine and what they are.

 

dude, thank you so much!
id rather do that than source another harness, wonder if it's any good, and then hassle with swapping it out.
my injectors are all low impedence. i never planned on using the 88.5 harness. i scrapped the HI injectors aswell.

 

I hope Hailers Sees this again.
anyways,(Hailers),I am going to do the Same thing,instead of using the s4 tii Harness on my N/A.( I am going to use the N/A 1986 Harness).
So,just to make it Said and Done.,I am using the N333 Based Rtek 2.1.
The Resistor Pack:If I use the Low Impedaance injectors I use the Resistor pack?..and If I use the HI impedance injectors,I "wire through) the Resistor Pcak?(that is doing that connector to Connector splice thing thet you have mentioned Numerous times!)
I depin 1R(pulling it out of the connector and Taping it).I also have to Depin Wire 3D,as the hraness is going to be running a Turbo engine.
The twin scroll solenoid Wires:I am not installing any "emissions stuff(rat's nest)..Is this associated with the Rat's nest?.(It will be a s5 keg running s4 Upper and TB,s5 Turbo and manifold).
I also have to Lengthen the TPS wires..gotcha.
Thanks alot.STYX.

 

hey i really need help with the same swap

 

so it means if my chassis harness came with a fuel pump resistor relay,the harness i have is turbo harness????

 

As long as the swap was done correctly in the first place (the wiring changes Hailers mentioned), there's no reason at all for the Rtek or any TII ECU not to work. Whoever said it wouldn't is a liar . I link to a big TII swap thread in my sig that covers this stuff.


I know I've answered this question before for you! I think you're making it more complicated than it is. If you use an '86 NA EM harness, it'll be low impedance and have the plug for the resistor pack. Plug the pack in and use all low impedance injectors, and you're set. Done.

Depin/cut 1R. I wouldn't worry about 3D, since it's just unused on manual cars. The twin scroll solenoid and re-wiring can be skipped since you have an S5 turbo. No twin scroll flapper to activate. Lengthen the TPS and BAC wires to reach their new locations.


If the car is S4, yes. S5 NAs also had the fuel pump resistor/relay. It's just the S4 NAs that did not.

 

I have a non turbo 87 car with a turbo engine and ECU in it. I used the stock 1987 EM harness on the engine. I have no problems at all.

The 1987 stock na harness and the 1986 are the same items.

There was never ever a fuel PUMP resistor relay on any stock series four RX-7 ever never and never ever.

My na to turbo 1987 has a RTEK 2.0 in it and runs flawlessly. What more can I say? No more. Minor wiring changes have to be made to the stock na series four harness and have been mentioned in past posts/threads. Minor.

N332 and N333 are the same item in the sense you can drive with one or the other and notice absolutly no difference at all.

The last time I looked at my cars, the fuel pump resistor relay is located on the bulkhead that holds the headlight assy's on and the harness that goes to it is what Mazda calls the FRONT harness and is no part at all of the harness that attaches to the engine which Mazda calls the EM harness (emissons harness...see FSM).

Non turbo series four had no fuel pump resistor relay at all. None. Zippity as in not there at all.. Most all series FIVE cars whether non turbo or turbo have the fuel pump resistor relay located on the headlight bulkhead as mentioned above. It's just in front of the afm/filter assy on those cars and series four Turbo cars. Not to be confused with the Circuit Opening Relay located above the steering column inside the car.

I think someone is confusing the fuel INJECTOR Solenoid Resistor Package with the Fuel Pump Resistor Relay package. Ain't the same items. The Solenoid Resistor Relay is bolted to the right fender and located below the afm/filter assy. It is composed of four six ohm resistors inline with the wiring to the four fuel injectors. It has FIVE wires going to it, four to the injectors and one which feeds batt voltage to the injectors thru the four six ohm resistors.

If a person uses high resistance injectors he should remove the Solenoid Resistor Package and put it on the shelf. Then splice all FIVE wires of the harness plug together and that's all that has to be done. The Solenoid Resistor Package wiring is part of the EM harness.

Ignore the words on the attached jpg. They were meant for another thread.

 

this is what im trying to talk about..

 

^ Yes, that's the fuel pump resistor/relay. As I said before, most if not all S5s had it. For S4s, only the turbo models got it.

 

i talked to justin pawlak the guy that i bought my front and dash harness he said it came from a 1988 NA GXL
its kinda weird my front harness has a fuel pump resistor relay and i checked the dash harness it plugs right up to a s4 ecu (N332)

this whole thing got me confused???

or maybe my harness came form a 1988.5 year rx7???

damn dont tell me i have to get another front harness...