Linking ecu's
03-01-17, 10:06 PM
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Linking ecu's
Hi, I recently bought a half finished 88 s4 body with a 90 s5 engine. I plan on linking the ecu's and I wanted to make sure that was possible before I blow myself up on the first startup. Does anyone have any experience doing this? Can someone please link me to pinouts that have helped others? New guy that needs a lot of help
03-02-17, 12:37 AM
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Turn the engine into an S4(use the s5 keg and attach the s4 components onto it.,run Premix) rather than trying to figure out if you can run 2 Ecus on one car.
You are gonna fry something and end up with nothing.
You are gonna fry something and end up with nothing.
03-02-17, 12:41 AM
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I would do that if I still had the s4 engine but I bough it with the swap halfway completed. What is the "keg"? I want to keep it s5 for the electronic fuel system anyway
03-02-17, 03:33 AM
#6
some people affectionately refer to the engine block as "the keg".
it sounds like a true cluster-floogal!
you're best-served choosing one ECU and going with it. of course you can probably eventually figure out how to run both, but i have to agree with Misterstyx69 that you're increasing your chance of screwing something up. that said, if Satch sees this, it might be up his alley.
www.foxed.ca should have Factory diagrams that you can download.
it sounds like a true cluster-floogal!
you're best-served choosing one ECU and going with it. of course you can probably eventually figure out how to run both, but i have to agree with Misterstyx69 that you're increasing your chance of screwing something up. that said, if Satch sees this, it might be up his alley.
www.foxed.ca should have Factory diagrams that you can download.
03-03-17, 07:12 AM
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You can still do this with the S5 engine.
BOTH engine are Fuel injected so you are not changing that at all.
If you get the upper/lower from an S4 and plop it on your S5 engine then you pretty well have gotten the engine to where you want it to be to easily plug into your S4 harness.Change the Water sensor on the side of the engine and I think also at the back of the water pump.Keep the fuel injectors and splice them into to the harness(different connectors)..Just make sure you go the right impedance to do so.
NOW without having to go and change the Front cover out which has the Electric OMP on it,you can delete The OMP on it and Premix the gas,so you get a way to lubricate the internals without going through the hassle of more mechanical work of slapping a front cover and the s4 Mechanical OMP on there and making it work.
Actually you can clean the engine up and remove the Oil injectors too IF desired.
This "swap" as you call it is sort of Rotary "101" and is documented a lot on here so you can peruse the SEC GEN TECH sections and should be able to get more info.
It's a easy thing to do,rather than start thinking that you can electrically wire in the S5.
..anyways IF you go that route then that "new fangled Electric OMP" which is in my opinion the worst design flaw that Mazda ever put on a Sec Gen will make you go nuts when it hits Limp mode due to it's common Failure.
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03-03-17, 01:55 PM
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so basically you are saying I need to change the water temp sensor, rewrire the injectors, and disconnect the OMP?
The whole reason I am doing this is because the ecu that I already have is for an NA car so it will not be able to control the turbo I have, I bought an upgraded Knight Sports ECU that I planned to use but I guess I am just TOO DUMB to be able to plug in one connection. I really just want help with info on how to rewrire because I will have to rebuy like $500 dollars in parts instead of just cutting some wires.
The whole reason I am doing this is because the ecu that I already have is for an NA car so it will not be able to control the turbo I have, I bought an upgraded Knight Sports ECU that I planned to use but I guess I am just TOO DUMB to be able to plug in one connection. I really just want help with info on how to rewrire because I will have to rebuy like $500 dollars in parts instead of just cutting some wires.
The BLOCK is the KEG..which in turn can be made from a S5 to an S4 engine.
You can still do this with the S5 engine.
BOTH engine are Fuel injected so you are not changing that at all.
If you get the upper/lower from an S4 and plop it on your S5 engine then you pretty well have gotten the engine to where you want it to be to easily plug into your S4 harness.Change the Water sensor on the side of the engine and I think also at the back of the water pump.Keep the fuel injectors and splice them into to the harness(different connectors)..Just make sure you go the right impedance to do so.
NOW without having to go and change the Front cover out which has the Electric OMP on it,you can delete The OMP on it and Premix the gas,so you get a way to lubricate the internals without going through the hassle of more mechanical work of slapping a front cover and the s4 Mechanical OMP on there and making it work.
Actually you can clean the engine up and remove the Oil injectors too IF desired.
This "swap" as you call it is sort of Rotary "101" and is documented a lot on here so you can peruse the SEC GEN TECH sections and should be able to get more info.
It's a easy thing to do,rather than start thinking that you can electrically wire in the S5.
..anyways IF you go that route then that "new fangled Electric OMP" which is in my opinion the worst design flaw that Mazda ever put on a Sec Gen will make you go nuts when it hits Limp mode due to it's common Failure.
You can still do this with the S5 engine.
BOTH engine are Fuel injected so you are not changing that at all.
If you get the upper/lower from an S4 and plop it on your S5 engine then you pretty well have gotten the engine to where you want it to be to easily plug into your S4 harness.Change the Water sensor on the side of the engine and I think also at the back of the water pump.Keep the fuel injectors and splice them into to the harness(different connectors)..Just make sure you go the right impedance to do so.
NOW without having to go and change the Front cover out which has the Electric OMP on it,you can delete The OMP on it and Premix the gas,so you get a way to lubricate the internals without going through the hassle of more mechanical work of slapping a front cover and the s4 Mechanical OMP on there and making it work.
Actually you can clean the engine up and remove the Oil injectors too IF desired.
This "swap" as you call it is sort of Rotary "101" and is documented a lot on here so you can peruse the SEC GEN TECH sections and should be able to get more info.
It's a easy thing to do,rather than start thinking that you can electrically wire in the S5.
..anyways IF you go that route then that "new fangled Electric OMP" which is in my opinion the worst design flaw that Mazda ever put on a Sec Gen will make you go nuts when it hits Limp mode due to it's common Failure.
03-03-17, 05:57 PM
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Now you want a Turbo too?...and bought a Knightsport ECU without knowing if it would work?
This is the "normal path of destruction" that you need NOT TO FOLLOW..
The best path is to STOP..research and then start your project.
I know that you are anxious to get the thing driving and enjoy it BUT you need to know What will work with What..and HOW To make all those parts work together.
That involves a solid STARTING POINT..to get a list of what you need to begin.
Buying parts and hoarding them as you go will only get you broke and still walking..
There IS a thread on how to wire a s5 into an S4 BUT be prepared to be a freakin genius and figure out the wiring colors,schematics and at the end of the day whether you have the patience and tinme to even delve into taking on such a path of "so called improvement"..
But then again you bought that ECU..so chuck that idea out the window..Turbo is a whole new ball game..Again.it's not like wrenching parts onto the car and it Runs..NOPE..far from it.
This is the "normal path of destruction" that you need NOT TO FOLLOW..
The best path is to STOP..research and then start your project.
I know that you are anxious to get the thing driving and enjoy it BUT you need to know What will work with What..and HOW To make all those parts work together.
That involves a solid STARTING POINT..to get a list of what you need to begin.
Buying parts and hoarding them as you go will only get you broke and still walking..
There IS a thread on how to wire a s5 into an S4 BUT be prepared to be a freakin genius and figure out the wiring colors,schematics and at the end of the day whether you have the patience and tinme to even delve into taking on such a path of "so called improvement"..
But then again you bought that ECU..so chuck that idea out the window..Turbo is a whole new ball game..Again.it's not like wrenching parts onto the car and it Runs..NOPE..far from it.
Last edited by misterstyx69; 03-03-17 at 06:01 PM.
03-03-17, 06:02 PM
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I shou
I should have been more clear to begin with, the engine is an stock, imported, s5 turbo 2 that was already in the car when I bought it as a roller. As of half an hour ago, I have a complete car that just needs to be plugged in to start. I really do appreciate your input and I do understand that I need my base to be solid. I have literally everything for this car except for a printed pinout so I can plug in the ecu that I have for the car
Now you want a Turbo too?...and bought a Knightsport ECU without knowing if it would work?
This is the "normal path of destruction" that you need NOT TO FOLLOW..
The best path is to STOP..research and then start your project.
I know that you are anxious to get the thing driving and enjoy it BUT you need to know What will work with What..and HOW To make all those parts work together.
That involves a solid STARTING POINT..to get a list of what you need to begin.
Buying parts and hoarding them as you go will only get you broke and still walking..
This is the "normal path of destruction" that you need NOT TO FOLLOW..
The best path is to STOP..research and then start your project.
I know that you are anxious to get the thing driving and enjoy it BUT you need to know What will work with What..and HOW To make all those parts work together.
That involves a solid STARTING POINT..to get a list of what you need to begin.
Buying parts and hoarding them as you go will only get you broke and still walking..
03-03-17, 06:07 PM
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Foxed.ca has the wiring diagrams.
I'll try to get back on here and give you more tips..
Just checkin in to see if anyone has tried to kill anyone...heh,heh..MOD duties!
I'll try to get back on here and give you more tips..
Just checkin in to see if anyone has tried to kill anyone...heh,heh..MOD duties!
