Will Japanese STI ECUs fit to Euro cars? Will these Japanese RHD ECUs fit European LHD cars?

Do STI ECUs bring any increase in performance when fitted to a standard car with Euro ECU?

No.

why not ?????

Pin outs and plugs are different. Even if you could higher rev limits, different cams, 100RON mapping and forged pistons are some key differences. Doesn't sound like a good recipe to me!

[Edited by john banks - 2/7/2002 4:37:06 PM]

You can do this, plugs are the same but a couple of the critical sensors are swapped - to stop people trying exactly this, I guess :)

I went as far as testing a P1 ecu in a my00 - decided not to go any further after learning the above given the different hardware between the cars.

If you understood the dangers, then it's a valid approach(imvho :)) if you were also planning on swapping turbo to match. Key differences to then remain are the cams and pistons....which I think are only there for the higher rev limit?

But...just swapping the ecu and leaving the OE turbo will cause wild overfueling - borewash was mentioned to me previously.

Richard

Thanks Dowser, I said no because it was said they were plug incompatible in a previous thread on this. Just how many connections have to be rewired?

Is this how the MY99/00 PPP ECU is done?

Err, am I living only in the world of the MY01+, or are the STi injectors different to (larger than) the standard UK / European car? If so, the STi ECU will underfuel as it works on the basis of injector duty cycle and less fuel will pass through the smaller injectors. Now, perhaps if you change the injectors, fuel pressure pump, regulator, and the ECU you might get the benefit .... ;)

Duncan :)

Crank & cam position sensor inputs are swapped from memory (so be wary of the V5 Sti pin-outs :)).

I should add I never confirmed this for myself, but it came from a very respectable source :D

The PPP is a straight swap into a Euro car - mine gets swapped before going anyway near a dealer :)

Richard

Errr - good point Duncan :o You spotted my deliberate mistake ;)

Richard

IIRC, one reputable source said the pin outs were totally incompatible and another was offering a P1 ECU for folk to try. Has anyone here actually seen it done?

to my knowledge the pin outs are certainly not completely different.

Best person to ask on this one is without a doubt pat.

Dowser,

swapping will not just cause overfuelling. Since it is meant for a td04 turbo which spools up much faster, it will cause underfuelling when the standard turbo comes onto boost sooner.

I got hold of the P1 ecu - it fitted into my my00 OK, engine turned over but didn't fire (no check engine light either!).

Investigation revealed the sensor input swap, and I then decided it was too much work/risk and returned the ecu (the vendor had mentioned a straight swap - which it isn't).

My intent had been to monitor AFR/knock and slowly (carefully :)) drive it. The reason I stopped was the work involved in swapping injectors - so bad, in fact, I promptly forgot it :D

Richard

I've just read this and was wondering if I'm going to have problems with using a WRX V5 ECU with my MY98 motor.
I was sold the engine and ECU as a complete kit by a vendor... they said it was a straight fit and everything would work. Anyone?
Mike Ghia

Errr - yeah - you hava a Phase II ECU with a Phase I engine - doesn't sound like a recipe for success. The Phase II engines have a very different advance profile over and above the Phase I engines.

OK - I cannot categorically state that it won't work, but I would seriously question that this is viable.

Trout

Trout,
Were you replying to me?
MG

Michael - yes mate :D

The pin outs on the MY01 are different - however I understand the pinouts on the pre MY01 cars are the same.

The reason why the car wouldn't start is that the cam and crankshaft pinouts are different for cars with immobilisers - which the STi does not have so the signal wires need to be swapped over.

Trout

PS If I could be arsed I would dig out the pin references for the MY99/00 and could tell you which wires to swap over. Will it work - who knows! I wouldn't try it!


[Edited by Trout - 2/8/2002 6:37:06 PM]

Most STI models do not have true forged pistons, the pistons they use standard are stronger than standard cast pistons, but only good for a max of 18PSI boost.

The other difference is slightly higher boost levels with the STI ECU's.

The connectors are mainly different between years rather than whether the car is an STI or not.

The two types are two monster plugs or two big plugs an one not so big plug. This change over happened between 1991 and 1994.

Dan

[Edited by submannz - 2/10/2002 8:41:08 PM]