86fc3sdrift

im swapping the n/a motor out of my rx7 and im wondering if when i put the new motor in do i use the n/a harness or the turbo harness. the motor is an s4 but there are many more plugs on the n/a then the turbo what should i do

myersprostatus

iTrader: (2)

use your n/a harness, get a vacuum and wiring diagram. the wiring shouldnt be to much different, the vacuum lines are pretty confusing though.
if you use your turbo harness your gonna have to reroute everything and pull apart the dash. get an s4 turbo ecu like n332, your also gonna have to get a new waterpump driveshaft fuel pump etc etc

86fc3sdrift

thanks for the tip i think id rather not rip out my dash anyways im wondering why i would have to get a different water pump and driveshaft

joeylyrech

iTrader: (11)

plug and play if you use the S4 na harness

wikdclwn

i am having a problem i have a 88 na and got a 89 turbo engine but the wiring harness for the engine does not connect to the connectors on the pass kick panel how do i connect these together??help

whereiscarmensandiego

u my friend have a s4 car with a s5 engine u ahve to buy a s5 ecu and a s5 harness

asiandude15

iTrader: (6)

If you can afford it, go standalone.....

joeylyrech

iTrader: (11)

for the 2 guys having trouble with the swap please search is been covered a lot of times

86fc3sdrift

so im wondering why i would have to rip out the dash is it because it is a right hand drive harness and will not reach or is it because the plugs inside the dash or something

MidnightOwl

If you are doing an S4 N/A to S4 TII swap, you can use the N/A harness. If you do a search, this has actually been covered a whole lot. I'm actually surprised HAILERS hasn't stepped in with a heavy sigh to relay this information to you. If you use the TII harness, you have to change around a few wires in order for it to work. Mainly the alternator and I believe the boost sensor wire.

86fc3sdrift

thanks alot sorry but could you tell me the site where i can read up on this haha

FelixIsGod29X

iTrader: (50)

+1 would like to see a good thread too

MidnightOwl

Go to http://www.rx7city.com/techconnect.htm or http://www.rotorwiki.com/index.php/Main_Page and grab the wiring section of the FSM and just compare pin outs at the ECU between the Turbo and N/A. Just swap over the wires that are necessary and voila.

I believe there are two wires you have to change doing this, plus your alternator wires are already hooked up (the Turbo one doesn't have the wires in it).

86fc3sdrift

and this is with the turbo harness staying on the motor right

HAILERS

No. You use the stock non turbo harness on the turbo engine. It's named the EM harness if you ever bothered to read the wiring diagrams.

You do what was suggested above in another post. You go to the FUEL AND EMISSIONS section of the FSM. You look at the CONTROL UNIT pages for the Turbo and non turbo cars. The CONTROL UNIT section lists what each wire does coming and going from the ECU. As you compare the Turbo pinout vs the Non Turbo pinout of wires, you readily see that there are but two significant differences b/t the two engines.

If you don't use the Twin Scroll solenoid to control the Twin Scroll Actuator, then it's almost just plug and play with no real differences.

If you use the Turbo EM harness on the non turbo car, then right away you lose the two wires that control the alternator (they are not in the Turbo EM harness but ARE in the Non Turbo harness). So you have to deal with those wires first of all. FYI: The alternator wires on a Turbo car are in the Engine harness, not the EM harness.

Then there are several other wires in the Turbo EM harness that don't mate with the right wires at the two plugs of the non turbo Front harness.

HHTurboVert

The several other wires he refered to that are different when using the turbo EM harness include a wire that needs to be de pined that will feed 5.0 volts into your boost pressure sensor circuit all the time, and a wire to make your temperature gauge work. There are a couple other wires that will need to be de pinned or moved as well, like one for the warning light cluster as well.

Messenger87

I am Very Interested in this post due these being the exact problems i am having can someone direct me to another post the goes into depinning and repinning the t2 harness into the ECu to correct the problems with the boost gauge, temp Gauge, and oil pressure gauge, along with the warning cluster?

A little info that might help :

year of car 87
originally N/A
has 87 T2 engine & Tranny
ECu n332
T2 Harness

HAILERS

************************************************** ************************************************** ************************************************** **
You put a Turbo EM harness on the engine when you should have just left the non turbo harness on the engine. But you didn't.

So go to the two ORANGE plugs on the EM harness that are inside the car. One plug is has fifteen sockets. Remove the wires shown in the attached jpg. The B wire might be Black/Brown instead of Black.

That is done so the boost sensor won't send 12vdc to the ECU pin 2B.

HAILERS

You can see from the jpg attached that the water temp wires are in different plugs on Turbo and non turbo cars. One is in the FEM-01 and the other is in the FEM-02. There's no way you can expect the turbo EM harness to mate with the right wire in the NON TURBO front harness.

You have to take action to make the Y/W wire in the EM turbo plug to mate with the Y/B wire in the non turbo FRONT harness.

The oil pressure should have worked if the only thing you changed was putting the turbo EM harness on the engine. I said THE ONLY THING changed. If you changed instrument clusters/other wiring harnesses, then that's more of a mess.

cambam3486

how in the world do you just know all the wiring of these cars off the top of your head. its amazing

RotaryRocket88

iTrader: (7)

Because the same wiring questions come up daily. Especially this one.

HAILERS

The series four car has two ORANGE colored plugs on the EM harness. The EM harness connects to the engine and then goes inside the passengers foot area and to the ECU. The ORNAGE plugs do not go to the ECU, but attach to the Front harness above and to the right of the passengers feet.

One plug has fifteen pins/sockets, the other thirteen. They are shown in the attached jpg.

Look at the attached jpgs. On each plug you'll see a wire color in (X) parenthsis (sp). Those in the ( ) are peculiar to the Turbo cars.

It's not hard or difficult to make a Turbo EM harness attach to the non turbo Front harness, but you need to know what each of the wires does in life. You can do that by looking at each wiring diagram picture and figuring it out. An example was the jpg I attached in one of my above post where I showed the Instrument cluster and the color of the water temp wires and how that jpg showed X-15 for the Y/W wire and X-16 for the Y/W wire from the water temp sensor.

Another example is if you look at the X-15 plug in the attachment. Look at the EM half of that X-15 plug. See the BW and WB wires one above the other on the plug????? See how for each of those wires there is a (BR) and a (BrB) pointing to them?????? The BR on a turbo EM harness comes from the boost sensor. The BrB is a ground wire.

Now on a non turbo the BW and the WB come from the small plug of the non turbo alternator.

The BW mates with a BW on the FRONT half of the plug which is 12vdc coming from the ENGINE fuse. You do not want the BR output wire of the Turbo EM harness being fed 12vdc. That would not only backfeed 12v to the boost sensor but also the ECU pin 2B. Not good. So you just depin the BR and BrB wires from the turbo EM half of the plug and tie them back to the harness with something...and tape over their ends.

Those two wires are the only ones that can cause HARM to the engine/ECU. The others like the Y/W (water temp) have to be moved to the other plug (X-16) so it can mate with the YB in the Front half of the X-16 plug.

The other ( ) wires I don't care to figure out for anybody. Done it in the past too many times to want to do it again.