2G 6 bolt 4g63t swapped into a n/a 4g63 EU car

Dan_NLS · May 31, 2026

Hi all, I have a 1996 Mitsubishi Eclipse that came with the n/a 4g63 engine.

I am swapping a 6 bolt 4g63t engine in from a Laser Turbo RS. The engine is complete with all ancillaries and the engine harness. The idea was to wire this to the existing loom in the car.

Struggling to know what to do regarding ECU’s. The standard ECU is MD327134 and is a 3 connector ECU - I had bought a MD335287 from a 1997 GST but this is a 4 connector ECU so I’ve had to return it.

Any help/ suggestions? Based in the UK so finding parts is quite difficult.

Thanks,
Dan

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steve · May 31, 2026

All the 2G Turbo ECUs are 4 connectors. I'm not sure what the other guys that have converted EU 2G 4G63 NA cars have done.

DSMPT · May 31, 2026

Dan_NLS said:
The standard ECU is MD327134 and is a 3 connector ECU - I had bought a MD335287 from a 1997 GST but this is a 4 connector ECU so I’ve had to return it.

IIRC, the euro 2g have a 3 connector ECU, the same pin arrangement as the early EVO 1~3 or RVR/Chariot which is different from the 1g DSM/GVR4 3 connector ECU. So if there is a chance that can be used in a euro 2g without rewiring, it might be one from the early EVO 1~3 or RVR/Chariot ECU, but I am not sure if it's a PnP due to some differences like immobilizer. I have never compare the two.

19Eclipse90 · Monday at 6:04 AM

I was reading this as the OP stating he’s wanting to swap a 6-bolt engine and harness from a Laser into his car. That’s why the harness has 3 connectors and doesn’t match with the 4-connector ‘97 ECU. :coy:

And a ‘90 version, no less. Any 1G harness into a 2G will be much more involved than most are willing to do.

DSMPT · Monday at 7:43 AM

19Eclipse90 said:
I was reading this as the OP stating he’s wanting to swap a 6-bolt engine and harness from a Laser into his car. That’s why the harness has 3 connectors and doesn’t match with the 4-connector ‘97 ECU.

And a ‘90 version, no less. Any 1G harness into a 2G will be much more involved than most are willing to do.

Oh I see my bad, I got confused. I thought his car is a euro 2g, And he separately got a 6 bolt engine with its 1g harness from a laser and he bought a US 2g ECU but didn't match his car's ECU harness 3 connectors.

Dan_NLS · Monday at 8:37 AM

DSMPT said:
Oh I see my bad, I got confused. I thought his car is a euro 2g, And he separately got a 6 bolt engine with its 1g harness from a laser and he bought a US 2g ECU but didn't match his car's ECU harness 3 connectors.

My car is a euro 2g (with a 3 connector ECU harness). The new engine I have is from a 90 Laser Turbo.

From what I’ve been reading, I need to ditch the wiring harness that the laser engine came with, continue to use the existing harness (that came with the n/a factory 4g63), plug it all into the Laser engine. But I will need to utilise/ swap a few aspects of the laser harness, such as the knock sensor (which I’ll need to run a dedicated wire from into the ECU), laser coolant temp sensors, CAS, injector resistor box.

I will also need: utilise a 91-94 eclipse ECU (52 pin 3 plug connector as the wiring architecture in my car is closer to a 1g eclipse than the US 2g turbo eclipse)- and purchase a seperate 1g female connector to connect the 10 essential pins from the original 64 pin connectors (12v power, ground, crank position signal, ignition coil trigger A + B, MPI relay control, MAF, and the four injectors so they fire correctly (e.g fire cylinder 1 using cylinder 4 loom path))

pauleyman · Monday at 8:48 AM

Never did much research but is a 2g NT euro car obd1 or obd2? I dont know obd requirements outside the US. Not sure if the entire industry standardized in 96 or just the US.

Dan_NLS · Monday at 8:58 AM

pauleyman said:
Never did much research but is a 2g NT euro car obd1 or obd2? I dont know obd requirements outside the US. Not sure if the entire industry standardized in 96 or just the US.

I believe in Europe obd2 became a requirement from 2001 - the Euro nt cars have a obd port that looks like an obd2 port but utilises the obd1 language (so obd2 diag tools would not work for instance).

DSMPT · Monday at 8:59 AM

Dan_NLS said:
My car is a euro 2g (with a 3 connector ECU harness). The new engine I have is from a 90 Laser Turbo.

From what I’ve been reading, I need to ditch the wiring harness that the laser engine came with, continue to use the existing harness (that came with the n/a factory 4g63), plug it all into the Laser engine. But I will need to utilise/ swap a few aspects of the laser harness, such as the knock sensor (which I’ll need to run a dedicated wire from into the ECU), laser coolant temp sensors, CAS, injector resistor box.

I will also need: utilise a 91-94 eclipse ECU (52 pin 3 plug connector as the wiring architecture in my car is closer to a 1g eclipse than the US 2g turbo eclipse)- and purchase a seperate 1g female connector to connect the 10 essential pins from the original 64 pin connectors (12v power, ground, crank position signal, ignition coil trigger A + B, MPI relay control, MAF, and the four injectors so they fire correctly (e.g fire cylinder 1 using cylinder 4 loom path))

What I technically meant is to distinguish that your car's 3 connectors for ECU and the 1G DSM's 3 connectors is different. The ones you have in your car now is the same as the early EVO 1-3 and RVR/Chariot ECU. The ones your new 6 bolt engine has is the same as 1G DSM/GVR4.

Dan_NLS · Monday at 9:31 AM

DSMPT said:
What I technically meant is to distinguish that your car's 3 connectors for ECU and the 1G DSM's 3 connectors is different. The ones you have in your car now is the same as the early EVO 1-3 and RVR/Chariot ECU. The ones your new 6 bolt engine has is the same as 1G DSM/GVR4.

I’m unsure if the Evo1-3 uses a different pin configuration or the same as what mine has as standard (which is 64 pins). I do think the 1g dsm ecu (e.g. MD166262) would be better than the Evo 1-3 ECU, due to the 1g DSM already being based off the 6 bolt engine rather than the 7 bolt so there’s a difference in crank and cam trigger patterns. I think the Evo ECU will also make the car run heavily lean because the baseline injector scale and air frequency maps don’t line up (Evo has 510cc injectors whereas the 1g Laser engine has 450cc, which is the same as what MD166262 is calibrated for)

So sticking to the MD166262 ECU (1g Eclipse) means everything (engine, wiring patch harness, injector resistor box, MAF logic) all belong to the 1g platform.

If I am wrong though or if there’s anything I’ve missed, please do correct me as I am a complete novice with this stuff and this is just what I’ve understood from reading countless forums / discussions / videos!

DSMPT · Monday at 10:39 AM

Dan_NLS said:
I’m unsure if the evo1-3 uses a different pin configuration or the same as what mine has as standard (which is 64 pins)

As I mentioned that I have never done this personally so I can't be 100% sure. I just would like to share some info. But what I am saying is they should be the same connectors between the early EVO/RVR/Chariot and the euro 2g. And way different from 1g's.
Isn't your car's ECU harness 3 connectors the same as the pic below?
I just did a quick diagram compression between the euro 2g ECU and the EVO 2-3 ECU, it seems pretty similar, they have almost the same pinout. There seem to be slight differences like the differences between US DSM and JDM DSM pinout.
Almost all sensor's connector pin's locations are the same between the early EVO and the euro 2g.

Dan_NLS said:
I do think the 1g dsm ecu (e.g. MD166262) would be better than the EVO 1-3 ECU,

EVO 1-3/RVR ECU would allow you to run ECMLink, so it would be pretty neat if the EVO/RVR ECU works, would be much less hassle with wiring.It's just my opinion though.

Dan_NLS said:
due to the 1g dsm already being based off the 6 bolt engine rather than the 7 bolt so there’s a difference in crank and cam trigger patterns.

1G DSM came with a 7 bolt too. And EVO 1-3 utilize the same CAS (Cam and crank sensor) as 1g.DSM. And it doesn't really matter if the 6 bolt or 7 bolt, the engine is still the early 4g63.

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Dan_NLS · Monday at 10:54 AM

DSMPT said:
As I mentioned that I have never done this personally so I can't be 100% sure. I just would like to share some info. But what I am saying is they should be the same connectors between the early EVO/RVR/Chariot and the euro 2g. And way different from 1g's.
Isn't your car's ECU harness 3 connectors the same as the pic below?
I just did a quick diagram compression between the euro 2g ECU and the EVO 2-3 ECU, it seems pretty similar, they have almost the same pinout. There seem to be slight differences like the differences between US DSM and JDM DSM pinout.
Almost all sensor's connector pin's locations are the same between the early EVO and the euro 2g.

EVO 1-3/RVR ECU would allow you to run ECMLink, so it would be pretty neat if the EVO/RVR ECU works, would be much less hassle with wiring.It's just my opinion though.

1G DSM came with a 7 bolt too. And EVO 1-3 utilize the same CAS (Cam and crank sensor) as 1g.DSM. And it doesn't really matter if the 6 bolt or 7 bolt, the engine is still the early 4g63.

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You are right - mine has the exact same ECU pinout.

Does this mean that the Evo 1-3 ECU would plug straight into my car and not require any wire/ pin modifications?

Do you know the ECU part number for this as I’m struggling to find what it is.

Thanks!

DSMPT · Monday at 11:49 AM

Dan_NLS said:
Does this mean that the Evo 1-3 ECU would plug straight into my car and not require any wire/ pin modifications?

I can't tell since I don't know much about the euro 2g but I know the euro 2g has many things different from the US/JDM DSM.
You can plug it if the connectors are the same but I guess at least It would probably require some works like rewiring or bypassing for somethings such as the rear O2 sensor, the immobilizer, alternator etc.
What I can tell is like MAF/TPS/Knock/Cam/Crank/Coolant temp/VSS/ISC have the same ECU pin number.

Dan_NLS said:
Evo has 510cc injectors whereas the 1g Laser engine has 450cc

Yes, EVO 1~4 have 510cc. I think the turbo RVR (except the EVO spec Hyper sports gear RVR) have 450cc injectors the same as 1g/2g turbo DSM.

DSMPT · Monday at 11:59 PM

Just an example to share : the 1st pic is EVO1~3 ECU pinout, the 2nd pic diagram is for early EVO and the 3rd pic diagram is for 1996 euro 2g.
You need to subtract 20 from the euro 2g connector B-56's pin numbers to match with the early EVO's connector B-61 pin numbers. EVO 1-3 pin number 51~72 would be 71~92 in euro 2g diagram. The other 2 connector's pin numbers 1~26 and 31~46 seem to be the same between both ECU (there should be differences on assignment though). You can see many pin positions are the same.

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