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Projects completed so I thought I would create a post for those that are interested. I take no responsibility for the repeatably of this conversion.
Basics: Running a 3.0L 6MGE engine in an 86 P-Type with a 7MGE ECU and supporting electronics.
Short Skinny: The car runs well. Cruising on the highway the AFRs are close to 14. In town they seem to be around 13. At wide open throttle the AFRs are around 11, way rich. Dyno showed a 8 Hp drop and a 7 Tq drop with AFR of 11 to 11.5, this is a drop from the 155Hp 165Tq using the 5M electronics. Seems to get way better gas mileage on the highway. I calculated 28.5 MPG the other day on a mostly highway trip. I think I was getting 25-26 highway before.
Needed Changes you MUST do:7M Injectors and clips, 7M ECU, 7M Knock Sensor, and 7M AFM, rewire the injectors, mod the distributer and run an extra wire to the dist..
Helpful Changes you SHOULD do: 7M ISCV, and 7M Cold Start Injector Switch, unplugging the fuel pressure regulator vacuum line.
Modification: Distributer, Wiring Harness, and re-pin of ECU connector.
Mods to the dist:
One tooth needs the be ground off of the two tooth wheel and a magnetic pick up needs to be added. Pics will be added later.
Mods to the harness:
Wires for the extra dist pickup and for the injectors need to be run. It is best to rewire the injectors and not use the stock wires. You will have to add the knock wire if not already wired in.
Re-pin of ECU connector: Varies from year to year. Use EWD supplements.
Things learned:
5M injector wiring is set up to fire ALL injectors at once where the 7M is set up to fire injectors in three patches of two. 7MGE fuel press is 5-7 psi higher than the 5MGE fuel pressure.
Thanks for helping:
Junkie - Aka. Shawn
CRE from supramania - Christoph
935motorsports - Aka. Robert
*5-Nov-07*
I was running lean for quite some time. I decided to look at the fuel pressures for 5M and for 7M. I noticed that the 7MGE has a higher fuel press than the 5M and the 7MGTE. This could be why I was running lean. I unhooked the vacuum line for the fuel pump and it is much better. Unhooking the vacuum line results in the max fuel press. If you look at the TSRM for the 5M and 7M you will see that the max fuel press for the 5M is the min fuel press for the 7M. There is about 5-7 psi difference between the two.
Basics: Running a 3.0L 6MGE engine in an 86 P-Type with a 7MGE ECU and supporting electronics.
Short Skinny: The car runs well. Cruising on the highway the AFRs are close to 14. In town they seem to be around 13. At wide open throttle the AFRs are around 11, way rich. Dyno showed a 8 Hp drop and a 7 Tq drop with AFR of 11 to 11.5, this is a drop from the 155Hp 165Tq using the 5M electronics. Seems to get way better gas mileage on the highway. I calculated 28.5 MPG the other day on a mostly highway trip. I think I was getting 25-26 highway before.
Needed Changes you MUST do:7M Injectors and clips, 7M ECU, 7M Knock Sensor, and 7M AFM, rewire the injectors, mod the distributer and run an extra wire to the dist..
Helpful Changes you SHOULD do: 7M ISCV, and 7M Cold Start Injector Switch, unplugging the fuel pressure regulator vacuum line.
Modification: Distributer, Wiring Harness, and re-pin of ECU connector.
Mods to the dist:
One tooth needs the be ground off of the two tooth wheel and a magnetic pick up needs to be added. Pics will be added later.

Mods to the harness:
Wires for the extra dist pickup and for the injectors need to be run. It is best to rewire the injectors and not use the stock wires. You will have to add the knock wire if not already wired in.
Re-pin of ECU connector: Varies from year to year. Use EWD supplements.
Things learned:
5M injector wiring is set up to fire ALL injectors at once where the 7M is set up to fire injectors in three patches of two. 7MGE fuel press is 5-7 psi higher than the 5MGE fuel pressure.
Thanks for helping:
Junkie - Aka. Shawn
CRE from supramania - Christoph
935motorsports - Aka. Robert
*5-Nov-07*
I was running lean for quite some time. I decided to look at the fuel pressures for 5M and for 7M. I noticed that the 7MGE has a higher fuel press than the 5M and the 7MGTE. This could be why I was running lean. I unhooked the vacuum line for the fuel pump and it is much better. Unhooking the vacuum line results in the max fuel press. If you look at the TSRM for the 5M and 7M you will see that the max fuel press for the 5M is the min fuel press for the 7M. There is about 5-7 psi difference between the two.