2JZ with 1JZ ecu?

[SL666]

Hey guys,

For several reasons, i would like to run a 2Jz from a 1JZ ECU, 1JZ from a soarer, 2JZ from an aristo, I'd be using the 1J trans.

Basically hoping that i could unplug everything off the 1J, drop the 2J into the hole, and plug everything back on? possible?

Anything i can check to see if its even close to going to go on?

mainly worried about sensor compatibility CAS etc..

Any help would be tops.

[brett_celicacoupe]

the 2jz ecu is probably capable of running the 1jz gearbox but not the other way around.

2jz-a340e still has 2 solenoids for shifting and one for TC lockup, which is all thats on the 1jz-a340e

[SL666]

I don't want to use the 2J box, the 1J box has a mechanical speedo drive (its a 1j supra box i think) which suits my purposes.

Anyone know if the injector pulse widths would be simular? and comatible?

[brett_celicacoupe]

i think you missed the point i was trying to make.

ie use the 2JZ ecu to run the 2JZGTE engine and the 1JZ gearbox

[Norbie]

I have my doubts this will work very well. Being a MAP-sensor arrangement there isn't a lot of flexibility for different VE curves etc, and being a completely different engine WRT swept volume, cam timing, port shapes etc I think you'll be up shit creek.

Stock 2JZ ECU's are cheap and there are plenty available. I have a spare Aristo ECU at home.

[SL666]

hmmm, i have a 2J ecu.. but as i had to do some funky jiggery pokery to get the speed sensor on the trans to work with the 1j ecu, i was thinking that i don't particularly want to repeat that step... not to mention the tacho, check engine light etc.

so unless the 2j ECU plugs in where the 1J one came out? i'm not particularly interested in that approach..


I'm not really after max power or anything, it will be getting replaced with a microtech somepoint in the nearish future.. but i want to be able to get it re-engineered and drive it for a couple of months before doing that..

[Norbie]

I have a feeling there will be a lot more jiggery pokery involved in getting your engine to run properly with the wrong ECU.

[SL666]

As long as the firing order is the same (haw haw haw) and the pulses to the injectors are similar, if it runs, it should be okay, but im more worried about the CAS being a completely different type/number of teeth etc.

I know its something that has been done on other engine families, but don't know about the J's.

rough idle, or a little too rich? i can live with for a few weeks..

oh - and the jiggery pokery i describe with the trans involved driving around with a battery powered oscilliscope etc.. hours and hours of f*cking around to get it right.

[SL666]

Am i right that the 1J has 375cc injectors and the 2J has 440's? if thats correct the fuelling should be pretty close..

[Norbie]

CAS is pretty much identical from what I've seen.

It will probably start and run, but I have my doubts it would run well enough to actually drive it around unless you have a piggyback to bring the AFR's into line. This is all guesswork though, if you're keen there's no reason you can't try it, but I think you'd be a pioneer on this one.

[Mos]

Am i right that the 1J has 375cc injectors and the 2J has 440's? if thats correct the fuelling should be pretty close..

Assuming the above to be correct, a 1JZ ECU would need 450ccs to fuel the 2JZ appropriately, right?
So if anything it will slightly underfuel it, which could cause some issues at part throttle as they already run pretty lean in non-power areas.

The CAS should be the same. The coils are similar. Are both sets of injectors high impedance (I know I've measured them but can't remember)?

Otherwise it really only is charge density and rpm.... timing you'd think would be similar?
Have you put any thought into any of the solenoid switching or will you run the sequential setup in parallel?

Defn bandaid, but it could just work Let us know how it goes

Mos.

[SL666]

Mos: My thing run's incredibly rich at the moment (for whatever reason)

Just leave it open i'd think (since i won't have any signal for switching a solenoid)

Well.. I'm heading this route because i think i'll have to take the engine out to change the turbo's over.. and i have a 2J on my shed floor. - with good turbo's (i have a spare set too)

And i don't really have the money right now (did i mention my wedding is in 2 months?) to lash out on the microtech and trans controller, injectors & big single right now..

hmm i might just give it a go.. if it works.. bargin, if it doesn't i can always just pull it back out and change the turbo's on the 1j anyway.. or get the dribbletech etc.

[manny]

Run the Soarer 1JZ-GTE loom, complete autobox and EFI ECU on the 2JZ-GTE motor and it will start, idle and run fine. An aristo motor needs the water temp sensor swapped for the Soarer 1JZ-GTE but all other sensors are plug and play - no cutting or splicing of wiring for the engine or body looms like you'd have if you tried to frankenstein the 2JZ-GTE loom and ECU into the Soarer body.
A cheap piggyback (SAFC etc) to trim fuel will tidy up the tuning up with the factory ECU.
Swap the Soarer 1JZ-GTE mounts across to the 2JZ-GTE and it all bolts to the crossmember like it came from the factory.
Fit a new ($120) 2JZ-GTE Supra or 1JZ-GTE Soarer viscous water pump in the place of the Aristo hydraulic water pump and the 1JZ-GTE viscous hub, fan and cowling will fit perfectly.
Hard wire the 2JZ turbos into parrallel mode as you'll loose sequental operation.
The only real custom part is welding up a custom accelerator cable bracket to suit the Soarer cable on the 2JZGTE plenum and fudging up some coolant hoses at the back of the head.
This conversion has now been done numerous times with excellent results and is a pretty simple conversion as far as engine swaps are concerned.

[SL666]

manny: great answer nearly everything applies....

<--------- except this is in my hilux

again thanks