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FC3SDrift · 04-04-2008, 06:52 PM

Chassis harness prep
To get the motor to work in the Series 4 Chassis I had to splice together the 2 engine harnesses. Luckily my engine came with the S5 chassis harness to ECU plug
So I spliced the series 5 end onto the series 4 chassis harness, there’s 4 wires that need to go to the #2 ecu plug, this is where a parts car comes in handy, I found a male and female connector with the same gauge wires and used that so I can easily disconnect those wires in the future. I also had to use the Series 4 Crank Position Sensor wires and ran those to the series 5 engine harness, I just found another male and female connector for those.
Altogether I have 7 wires that needed to be spliced to the series 5 engine harness
3 Crank Position Sensor wires, battery, ignition switch, main relay, fuel pump resistor
Relay.
I have a 4 wire connector and a 3 wire connector and a S5 chassis harness to ecu plug spliced on the end of the S4 chassis harness

I did it one wire at a time so I made sure I didn’t mix any up, get some shrink wrap and solder each wire so there’s no chance of a short later on down the road.
There are a few pins that weren’t needed for actual engine function they are just auxiliary items such as fog lights, rear defroster ect… So I didn’t even bother connecting those, a couple of them had the pin totally removed.
When all this was done the Chassis was ready for the S5 swap and I moved onto the engine harness

Engine harness prep
I started out with a Series 4 and Series 5 engine harness; I completely stripped the S4 harness. The FEM connector with all the wiper motor connectors on it. Is actually only connected to engine harness by 2 wires, a ground and a wire to some solenoid, the other FEM connector I traced the wires through the engine harness, the wires are mostly grounds, the oil pressure sensor and the water temperature sensor and the one wire tied into the boost sensor wire goes to the stock boost gauge . the 3 wires for the ignition switch, battery, and fuel resistor relay come out from the 2nd FEM connector and originally went to the s4 #2 ecu plug but I hooked them up to the female end of the connector I spliced on the #1 S5 ecu to chassis plug
When I had the 2 FEM plugs separated from the Series 4 harness I moved onto the series 5 engine harness
I stripped the series 5 harness from the ecu plugs to where it started to branch off to all the sensors. I used a JDM RHD engine harness so it was a little different there is only one FEM connector. The actual colour combination is very similar on the S5 harness. for the grounds were the same brown wires so I just spliced in grounds from the S4 FEM plugs to where the S5 fem plug grounds were, I Had to run the 3 wires from the #2 ECU plug for the CPS wires and spliced them on a 3 wire connector. Connected the boost gauge wire and my stock gauge works! It was mostly just grounds that I spliced in from the S4 FEM to S5 engine harness, and where it branches off the boost sensor. I had to splice into the black with white stripe wires that go through the engine harness to the 4th wire on the connector I added for the MAIN RELAY. I just left the connectors for the wipers and cruise alone. I measured to see where the FEM plugs needed to sit on the harness and got some heat resistant electrical tape….I don’t know if its just because I’m Canadian lol but I like to wrap the harness with a layer of hockey tape before I wrap it I figure It adds a bit of durability to the harness. I rewrapped the harness all nice, and in the end I ended up with a S5 engine harness with 2 S4 FEM plugs, a 4 wire connector for the ignition switch, battery, main relay, FR relay, and a 3 wire connector with the CPS wires
I hooked it back up on the engine as it normally sat on the engine as a RHD harness but I ran the wiring along the back fire wall and in the end turned out to be a good way to do a wire tuck….you can basically only see the connectors that are normally visual….but the rest of the engine harness is hidden. I have the ecu in the normal mounting bracket.

S4 to S5 changes
I had a hard time trying to find what I was going to have to change when I did my swap. All “Experts” like to pretend they know everything but it was quite obvious they didn’t have a clue.
The Series 5 TII transmission cradle and crossmember are different …I found that out after I bought a series 4 crossmember. I ended up buying them new from the Mazda dealer.
I had to also get a N370 pressure sensor, and the I have to get a S5 style koyo rad with the filler neck on the rad. For now I’ve been using a remote filler neck, does the trick.
Altogether the changes I made to the wiring harness and the Trans crossmember, pressure sensor, and radiator those are the only changes I had to make to get my JDM Series 5 TII engine to run in my 87 TII.

Here's a picture of the engine after I put it in

Coming Soon
Walbro 255lph fuel pump
3” Stainless Steel Turbo back exhaust
MS1 v3
Coilovers with camber plates
Mazdatrix Steering angle kit
Energy Suspension bushing kit
HD ball joints
Bodykit
Lightweight black 17” rims
Fresh Red Paint
EBC green brake pads
Slotted rotors
SS brake lines
SS clutch line
S5 Tail lights
Polyurethane engine, Trans, diff mounts
Rear steer eliminator
Front and rear Strut bars
That’s what I hope to have done by the end of the season!

04-04-2008, 06:52 PM	#3
FC3SDrift The Newbie Join Date: Apr 2008 Posts: 11 Rep Power: 0	Chassis harness prep To get the motor to work in the Series 4 Chassis I had to splice together the 2 engine harnesses. Luckily my engine came with the S5 chassis harness to ECU plug So I spliced the series 5 end onto the series 4 chassis harness, there’s 4 wires that need to go to the #2 ecu plug, this is where a parts car comes in handy, I found a male and female connector with the same gauge wires and used that so I can easily disconnect those wires in the future. I also had to use the Series 4 Crank Position Sensor wires and ran those to the series 5 engine harness, I just found another male and female connector for those. Altogether I have 7 wires that needed to be spliced to the series 5 engine harness 3 Crank Position Sensor wires, battery, ignition switch, main relay, fuel pump resistor Relay. I have a 4 wire connector and a 3 wire connector and a S5 chassis harness to ecu plug spliced on the end of the S4 chassis harness I did it one wire at a time so I made sure I didn’t mix any up, get some shrink wrap and solder each wire so there’s no chance of a short later on down the road. There are a few pins that weren’t needed for actual engine function they are just auxiliary items such as fog lights, rear defroster ect… So I didn’t even bother connecting those, a couple of them had the pin totally removed. When all this was done the Chassis was ready for the S5 swap and I moved onto the engine harness Engine harness prep I started out with a Series 4 and Series 5 engine harness; I completely stripped the S4 harness. The FEM connector with all the wiper motor connectors on it. Is actually only connected to engine harness by 2 wires, a ground and a wire to some solenoid, the other FEM connector I traced the wires through the engine harness, the wires are mostly grounds, the oil pressure sensor and the water temperature sensor and the one wire tied into the boost sensor wire goes to the stock boost gauge . the 3 wires for the ignition switch, battery, and fuel resistor relay come out from the 2nd FEM connector and originally went to the s4 #2 ecu plug but I hooked them up to the female end of the connector I spliced on the #1 S5 ecu to chassis plug When I had the 2 FEM plugs separated from the Series 4 harness I moved onto the series 5 engine harness I stripped the series 5 harness from the ecu plugs to where it started to branch off to all the sensors. I used a JDM RHD engine harness so it was a little different there is only one FEM connector. The actual colour combination is very similar on the S5 harness. for the grounds were the same brown wires so I just spliced in grounds from the S4 FEM plugs to where the S5 fem plug grounds were, I Had to run the 3 wires from the #2 ECU plug for the CPS wires and spliced them on a 3 wire connector. Connected the boost gauge wire and my stock gauge works! It was mostly just grounds that I spliced in from the S4 FEM to S5 engine harness, and where it branches off the boost sensor. I had to splice into the black with white stripe wires that go through the engine harness to the 4th wire on the connector I added for the MAIN RELAY. I just left the connectors for the wipers and cruise alone. I measured to see where the FEM plugs needed to sit on the harness and got some heat resistant electrical tape….I don’t know if its just because I’m Canadian lol but I like to wrap the harness with a layer of hockey tape before I wrap it I figure It adds a bit of durability to the harness. I rewrapped the harness all nice, and in the end I ended up with a S5 engine harness with 2 S4 FEM plugs, a 4 wire connector for the ignition switch, battery, main relay, FR relay, and a 3 wire connector with the CPS wires I hooked it back up on the engine as it normally sat on the engine as a RHD harness but I ran the wiring along the back fire wall and in the end turned out to be a good way to do a wire tuck….you can basically only see the connectors that are normally visual….but the rest of the engine harness is hidden. I have the ecu in the normal mounting bracket. S4 to S5 changes I had a hard time trying to find what I was going to have to change when I did my swap. All “Experts” like to pretend they know everything but it was quite obvious they didn’t have a clue. The Series 5 TII transmission cradle and crossmember are different …I found that out after I bought a series 4 crossmember. I ended up buying them new from the Mazda dealer. I had to also get a N370 pressure sensor, and the I have to get a S5 style koyo rad with the filler neck on the rad. For now I’ve been using a remote filler neck, does the trick. Altogether the changes I made to the wiring harness and the Trans crossmember, pressure sensor, and radiator those are the only changes I had to make to get my JDM Series 5 TII engine to run in my 87 TII. Here's a picture of the engine after I put it in Coming Soon Walbro 255lph fuel pump 3” Stainless Steel Turbo back exhaust MS1 v3 Coilovers with camber plates Mazdatrix Steering angle kit Energy Suspension bushing kit HD ball joints Bodykit Lightweight black 17” rims Fresh Red Paint EBC green brake pads Slotted rotors SS brake lines SS clutch line S5 Tail lights Polyurethane engine, Trans, diff mounts Rear steer eliminator Front and rear Strut bars That’s what I hope to have done by the end of the season!