3sgte Ecu's

[Just1n_mc]

Ive got an AW11 with a GEN1 3SGTE in it. I am looking to get a MINES ecu but the only I can find is for the 90 SW20 MR2 with a GEN2 3SGTE. My question is are these interchangeable? If not is there much stuffing around to fit one in. I'm an Auto Electrician so the whole wiring issue shouldn't be a hassle, I just need to know if it's possible to do and if it's an easy job or a pain in the arse to do.

Thanks in advance, Justin.

[Squid]

Main diff I can think of is AFM vs map.

I believe the dizzy may be different, the gen 3 runs much bigger injectors so you would need to upgrade them (contact me I have a set that might be for sale )


When upgrading the injectors, I don't think the gen 1 fuel rail will support the flow required, but this is not speaking from experience....

[Just1n_mc]

I thought the GEN2's where still AFM and ran the same injectors.

I know the plugs are different, but I thought all it would take would be re-wire my loom to the later ecu plug.

[Squid]

haha sorry misread, tought the mines was on a gen3.

Yes what you said is correct, the gen2 runs the afm as well.

[Joshstix]

The Gen1 and Gen2 3SGTE's are hugely different engines. I would expect even if you did change the wirirng to fit the mines computer it would be even less well suited to your engine than it was to a Gen2.

If you want to get a computer that isn't a complete kludge get a proper programmable system and have it tuned for your setup.

[Just1n_mc]

I think that might be the way to go. Any suggestions as to what sort of setup to get?

[Joshstix]

I only really have one recommendation when it comes to what computer to use. Find a tuner you trust to tune it and listen to what they recommend.

[Squid]

Josh has a good point, talk it through with some one, you need to tell them what you are looking for, and if they know their shit (or aren't on a big retainer by one brand) then they will give you the advice you seek.

I went haltech when I was going to use a gen2 in the st165, but then got this gen3 engine, my tuner said it wasn't the best match to the haltech (which I had already bought) but he could make it work :S

[sw20r]

I've done this - Rewired about 14 pins to suite from GEN 1 3SGTE to GEN 2 its all there, except for 1 which needs to be added.

I've also got a Mines style Ecu Its got another motherboard, 8500RPM redline, 18psi fuel cut, will boost to 14//15psi instead of 7-10psi, better on petrol. if your interested PM me

I've done the wiring swap somewhere here.. let me dig it up Its pretty straight forward and easy todo in an mr2

[EDIT]Found it!

http://www.toymods.net/forums/showth...767#post121767

Its not comprehensive but I hope you get the idea..

[Joshstix]

That really depends on how you define gen1 and gen2. To me there is only really 3 generations of 3SGTE, gen1 ST165, Gen 2 early SW20 and ST185, Gen 3 ST205 and late SW20. Then there are the caldina engines but I consider them pretty much gen 3 engines with different management.

If what the origonal poster is talking about is an early gen2 engine compared to a later gen2 engine then getting the computer to work should be quite straight forward.

[sw20r]

The way to find out is to actually trace the wiring

Theres upto 4-5 Variations per year/car/model of the 3SGTE

The main differences ive seen are - GEN 1 MR2s dont have abs std and Powersteer. So its best to compare and check your wiring

[Joshstix]

That's the thing there are several revisions of the SW20 but the generation terminology is generally used to apply to the engine itself.

[sw20r]

Yes you need to know the exact model of the car where the engine came from IE -

1990-1991.5 SW20 = GEN 2 Engine, GEN 1 WIRING LOOM
1991.5-1992 SW20 = GEN 2 Engine, GEN 2 Wiring loom (14 pins located differently)

etc

[Just1n_mc]

My ECU is the JAP spec ST165 and he's ECU is the JAP spec GEN1 SW20.

I tried crossing off the same pins in each and i'm left with extra's in each ECU.

The plugs are different also so I can't just swap the pins.

[AbaddonMR2]

That really depends on how you define gen1 and gen2. To me there is only really 3 generations of 3SGTE, gen1 ST165, Gen 2 early SW20 and ST185, Gen 3 ST205 and late SW20. Then there are the caldina engines but I consider them pretty much gen 3 engines with different management.

If what the origonal poster is talking about is an early gen2 engine compared to a later gen2 engine then getting the computer to work should be quite straight forward.

Hey Josh do you know if the caldina uses the 5S block?

[Joshstix]

No the Caldina still uses the 3S block with the full jacket between 2 and 3. Apparently the blocks have less core shift though. What they do have that is nice is a crank angle sensor mounted on the oil pump and direct fire ignition.