MK3 1JZ With 2JZ ECU?

[BusterMK3]

There is a guy over here in the Atlanta area selling a 1JZ block, 2JZ head, and a 2JZ ECU etc.. Basically everything needed for a 1JZ/2JZ frankenmotor MK3. But my question is are any of you guys running this swap, and have you heard of running a 1JZ with a 2JZ ECU? And for you 1JZ and 2JZ people, how realiable (more so livable) are they as a daily driver?

 

[Supra NA-T]

1.5JZ is just like driving a normal 1j or 2j car no different.

 

[OneJArpus]

A 1jz on 2j electronics are a good choice if you have the parts already. Reason, 2J ECUs do not suffer the same capacitor issues 1j computers have.

 

[yhatzee89]

So does a 2jz ECU plug right up to an unmodified 1jz harness?

 

[hvyman]

No. Has to either have a patch harness or a 2jz harness. Engine side of the harness is pretty much the same for the engine to run.

 

[thesupragod]

Im actually getting ready to do the same thing on my 1j. My 1j harness is in good shape and my ecu has just been re-caped by DM but according to my mechanic the 2j stuff is just plain better. I went with USDM TT harness and ecu.

 

[yhatzee89]

Well I just bought a new harness from tweakd, so I think my harness is up to the job, but all I'll need is a adaptor harness and I can plug up a 2J ECU? Would that keep me from needin all the piggyback stuff? Or do they make an aftermarket ECU like the blitz access/mines?

 

[BusterMK3]

He wants 300 for the 1j block and 600 for the 2j head...

 

[BusterMK3]

1.5JZ is just like driving a normal 1j or 2j car no different.

Performance wise, where would you say it sits?

 

[yhatzee89]

I think it needs to be the other way around to work, 2J block and 1J heads... Or am I high?

 

[AbsoluteSpeed]

I think it needs to be the other way around to work, 2J block and 1J heads... Or am I high?

1jz block and 2j head would still be 2.5L, you're not getting any extra displacement but you are getting a head that flows slightly better.

 

[BusterMK3]

so then go for 2j block with 1 j head and disregard that guy? lol

 

[yhatzee89]

Sounds like he did the 1.5JZ and is just selling his extra pieces...

 

[Grandavi]

If the price is right, I would think your still okay, just not "as good"?

Even though I love the 7M (cause Im stuck with it.. lol), I am so jealous of you guys doing these...

 

[OneJArpus]

Performance wise, where would you say it sits?

I have a 1J head with 264 cams (stock everything else) and a GE block

MasterPower 61mm .68 A/R drewgo manifold
Single walbro n supporting mods
2.5MM boost logic headgasket.
did 490 @ 404 ft lb of tq @ 22 psi

Because of fuel pressure drop i lowered it to stable 20 psi...

 

[aka paco]

My buddy has a 1.5jz. 2jz block 1j head, but he is running a 2JZ ecu with a patch harness.


I would avoid using a 1jz at all costs.

 

[yhatzee89]

I would avoid using a 1jz at all costs.

Why do say that?

 

[AbsoluteSpeed]

Basically, you'll end up with a complicated 1J.

The typical 1.5JZ uses the the head and wiring of a 1J and the extra cc's of the 2J block. All the wiring and everything plugs right in making it a simple plug and play ordeal.

If you're not afraid of a bit of wiring and possibly some fabrication (not sure if intercooler pipes or down pipe will match up), I say go for it.