ECU question
04-22-06, 08:57 AM
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ThE_CaRbOn_GuRu
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ECU question
I have a 1986 N/A rx and i am swapping to twin turbo and i was going to buy a turbo ecu but do i also need the wiring harness or will the stock one plug in
04-22-06, 09:34 AM
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HAILERS
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If you put a turboii emissions harness in a non turbo........guess what? You still HAVE to make wiring adjustments to the harness at the plugs called X-15 and X-16.
You also NEED to have a turbo boost/pressure sensor to go with it because of the output of the non turbo boost sensor DOES NOT match the ECU.
In my humble opinion the turboii emissions harness in a non turbo for this swap is a waste. I've other words than waste for it.
You also NEED to have a turbo boost/pressure sensor to go with it because of the output of the non turbo boost sensor DOES NOT match the ECU.
In my humble opinion the turboii emissions harness in a non turbo for this swap is a waste. I've other words than waste for it.
04-22-06, 10:26 AM
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Well, John Bull, it's like this. I gave him a bum answer. He asked about a twin turbo install in a 86 non turbo and I'm clueless how to do that. I could do it if I had the wiring diagrams and the FSM downloaded from the 3rd gen site.
I've only done a non turbo 87 to turbo swap, never a twin turbo swap. For money I'll figure it out for someone.
I've only done a non turbo 87 to turbo swap, never a twin turbo swap. For money I'll figure it out for someone.
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04-22-06, 11:06 AM
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There was a key word in my post. MONEY. I know where the schematics are and have no interest.
IF it was just a non turbo to turbo, the two plugs on the emisisons harness would have to be tended to at the plugs called X-15 and X-16.
The alt plug will not be found on the turbo emissions harness. It is in the emissions harness on the non turbo but on the turbo cars it's on the engine harness. So you need to patch in two new wires with one wire to the Meter fuse and the other to the CPU OR patch the wires to the X-16/15 plug FRONT harness where they go on the original n/a.
That being the case, you have to contend with those two wires for the alt plug at the alternator AND now you have to consider, that since the non turbo had those two wires in the emissions harness, AND the emission harness mates with the Front harness, just how will this effect things if I put in a turbo emisisons harness????
Well if you mate the turbo emissions harness with the non turbo Front harness, that will result in the meter fuse feeding the boost sensor AND ECU pin 2B 12vdc. Not desireable for obvious reasons.
Also the water temp sensor will not feed the water temp gauge because of the different wiring pinouts b/t turbo vs non turbo. You have to remove swap a wire from X-16 to X-15 or vice versa, I forget which.
There's a change or two more to be made but nothing that can't be figured out by looking at the FSM wiring diagrams and looking at the pinout of the X-15 and X-16 plugs (both halves of the plugs, the E and the F part). The pins/sockets that are peculiar to the Turbo, have a ( ) around the wire colors. You then look at the wiring diagrams and figure out what changes are to be made and just WHAT THE HECK that Lg/B wire I pulled out did on a Turbo car.
Or you can go to Rotary REssureections site and he has a write up on how to do the swap. It's a lot less wordy than what I just wrote and seems to work for others.
And I have never and never will use a turo emissions harness on a swap. I used my old n/a emissions harness. Some wiring changes had to be made there also. To each his own.
IF it was just a non turbo to turbo, the two plugs on the emisisons harness would have to be tended to at the plugs called X-15 and X-16.
The alt plug will not be found on the turbo emissions harness. It is in the emissions harness on the non turbo but on the turbo cars it's on the engine harness. So you need to patch in two new wires with one wire to the Meter fuse and the other to the CPU OR patch the wires to the X-16/15 plug FRONT harness where they go on the original n/a.
That being the case, you have to contend with those two wires for the alt plug at the alternator AND now you have to consider, that since the non turbo had those two wires in the emissions harness, AND the emission harness mates with the Front harness, just how will this effect things if I put in a turbo emisisons harness????
Well if you mate the turbo emissions harness with the non turbo Front harness, that will result in the meter fuse feeding the boost sensor AND ECU pin 2B 12vdc. Not desireable for obvious reasons.
Also the water temp sensor will not feed the water temp gauge because of the different wiring pinouts b/t turbo vs non turbo. You have to remove swap a wire from X-16 to X-15 or vice versa, I forget which.
There's a change or two more to be made but nothing that can't be figured out by looking at the FSM wiring diagrams and looking at the pinout of the X-15 and X-16 plugs (both halves of the plugs, the E and the F part). The pins/sockets that are peculiar to the Turbo, have a ( ) around the wire colors. You then look at the wiring diagrams and figure out what changes are to be made and just WHAT THE HECK that Lg/B wire I pulled out did on a Turbo car.
Or you can go to Rotary REssureections site and he has a write up on how to do the swap. It's a lot less wordy than what I just wrote and seems to work for others.
And I have never and never will use a turo emissions harness on a swap. I used my old n/a emissions harness. Some wiring changes had to be made there also. To each his own.
04-22-06, 11:12 AM
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HAILERS
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There was a key word in my post. MONEY. I know where the schematics are and have no interest.
IF it was just a non turbo to turbo, the two plugs on the emisisons harness would have to be tended to at the plugs called X-15 and X-16.
The alt plug will not be found on the turbo emissions harness. It is in the emissions harness on the non turbo but on the turbo cars it's on the engine harness. So you need to patch in two new wires with one wire to the Meter fuse and the other to the CPU OR patch the wires to the X-16/15 plug FRONT harness where they go on the original n/a.
That being the case, you have to contend with those two wires for the alt plug at the alternator AND now you have to consider, that since the non turbo had those two wires in the emissions harness, AND the emission harness mates with the Front harness, just how will this effect things if I put in a turbo emisisons harness????
Well if you mate the turbo emissions harness with the non turbo Front harness, that will result in the meter fuse feeding the boost sensor AND ECU pin 2B 12vdc. Not desireable for obvious reasons.
Also the water temp sensor will not feed the water temp gauge because of the different wiring pinouts b/t turbo vs non turbo. You have to remove swap a wire from X-16 to X-15 or vice versa, I forget which.
There's a change or two more to be made but nothing that can't be figured out by looking at the FSM wiring diagrams and looking at the pinout of the X-15 and X-16 plugs (both halves of the plugs, the E and the F part). The pins/sockets that are peculiar to the Turbo, have a ( ) around the wire colors. You then look at the wiring diagrams and figure out what changes are to be made and just WHAT THE HECK that Lg/B wire I pulled out did on a Turbo car.
Or you can go to Rotary REssureections site and he has a write up on how to do the swap. It's a lot less wordy than what I just wrote and seems to work for others.
And I have never and never will use a turo emissions harness on a swap. I used my old n/a emissions harness. Some wiring changes had to be made there also. To each his own.
Couldn't help the John Bull. For some reason I have a vivid memory of a Clint Eastwood movie. A cowboy movie that had Richard Harris (I think), and he was on a train with a fellow who had a chip on his shoulder for the English, and kept muttering something about John Bull this John Bull that, so Richard Harris's character could over hear the John Bull. The movie was The Unforgiven.
And there is an Archive on this site that deals with the common n/a to turbo swap plus a search engine with several dozen ideas about the swap.
IF it was just a non turbo to turbo, the two plugs on the emisisons harness would have to be tended to at the plugs called X-15 and X-16.
The alt plug will not be found on the turbo emissions harness. It is in the emissions harness on the non turbo but on the turbo cars it's on the engine harness. So you need to patch in two new wires with one wire to the Meter fuse and the other to the CPU OR patch the wires to the X-16/15 plug FRONT harness where they go on the original n/a.
That being the case, you have to contend with those two wires for the alt plug at the alternator AND now you have to consider, that since the non turbo had those two wires in the emissions harness, AND the emission harness mates with the Front harness, just how will this effect things if I put in a turbo emisisons harness????
Well if you mate the turbo emissions harness with the non turbo Front harness, that will result in the meter fuse feeding the boost sensor AND ECU pin 2B 12vdc. Not desireable for obvious reasons.
Also the water temp sensor will not feed the water temp gauge because of the different wiring pinouts b/t turbo vs non turbo. You have to remove swap a wire from X-16 to X-15 or vice versa, I forget which.
There's a change or two more to be made but nothing that can't be figured out by looking at the FSM wiring diagrams and looking at the pinout of the X-15 and X-16 plugs (both halves of the plugs, the E and the F part). The pins/sockets that are peculiar to the Turbo, have a ( ) around the wire colors. You then look at the wiring diagrams and figure out what changes are to be made and just WHAT THE HECK that Lg/B wire I pulled out did on a Turbo car.
Or you can go to Rotary REssureections site and he has a write up on how to do the swap. It's a lot less wordy than what I just wrote and seems to work for others.
And I have never and never will use a turo emissions harness on a swap. I used my old n/a emissions harness. Some wiring changes had to be made there also. To each his own.
Couldn't help the John Bull. For some reason I have a vivid memory of a Clint Eastwood movie. A cowboy movie that had Richard Harris (I think), and he was on a train with a fellow who had a chip on his shoulder for the English, and kept muttering something about John Bull this John Bull that, so Richard Harris's character could over hear the John Bull. The movie was The Unforgiven.
And there is an Archive on this site that deals with the common n/a to turbo swap plus a search engine with several dozen ideas about the swap.
Last edited by HAILERS; 04-22-06 at 11:14 AM.
04-22-06, 11:24 AM
#11
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Originally Posted by gray_86
I have a 1986 N/A rx and i am swapping to twin turbo and i was going to buy a turbo ecu but do i also need the wiring harness or will the stock one plug in
There's some small wiring changes to be made. Like you need the twin scroll solenoid to work so you patch in a wire from it to a connector about a foot or so away. That type thing. You will not have Knock Box wire in the emisisons harness but the engine will start and run just fine without. If you come across a Knock Box, it's easy to wire in. Make a gnd wire, find 12vdc source from that Theft protection plug just behind the right front speaker area, run one wire to the ECU form the box and one wire from the emisisons harness to the BOX. I ran for a half year or more without a Knock Box.
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