legacy conversion problems

[Leighos]

You're not doing it twice, this is just information gathering...

I have yet to find a conversion pinout diagram that converts a 4 plug directly to a 3 plug!

Maybe I'll draw up my own once I've done it and ironed out any bugs, then post it up for all to use

[rex-leggy]

ok i understand now lol thankyou

[Leighos]

Sweet as.

Just to add also, when looking for your ECU, you'll most likely need the AFM that suits that ECU, and even injectors if your going STi ECU.

[ReubenH]

Yep, it's also been established that the 4-plug plugs plug into 3-plug ECU, and there looks to be an equal amount of re-pinning to do (about half ish) So really, i reckon it would be foolish to go with 4-plug ECU, when you can get a 3-plug in there with the same amount of hassle. The one thing about the 3-plugs are you will need to get yellow injectors, and a compatible air flow meter.

Wiring wise, take a look at this PDF, and the northursalia link above

ECU Pinouts BC5/BG5a/WRX 4-plug.pdf

Also, the GTB 3 plug is the same as the impreza 3plugs, only it has 4 ignition wires not 2. Regardless, it may help to have both. i fount the little diagram at the top of the gtb one very handy

97-98 ECU pinout.pdf

[rex-leggy]

 teamnicknz said:

Oh dude u got the same ecu as me 7c but mines yellow (dunno what that means) im making an adapter up as well to suit the v3/4 sti ecu i think ive almost got it all sorted apart from a couple of things, will keep u informed.

thanks dude!!

[rex-leggy]

 ReubenH said:

Yep, it's also been established that the 4-plug plugs plug into 3-plug ECU, and there looks to be an equal amount of re-pinning to do (about half ish) So really, i reckon it would be foolish to go with 4-plug ECU, when you can get a 3-plug in there with the same amount of hassle. The one thing about the 4 plugs are you will need to get yellow injectors, and a compatible air flow meter.

Wiring wise, take a look at this PDF, and the northursalia link above

ECU Pinouts BC5/BG5a/WRX 4-plug.pdf

Also, the GTB 3 plug is the same as the impreza 3plugs, only it has 4 ignition wires not 2. Regardless, it may help to have both. i fount the little diagram at the top of the gtb one very handy

97-98 ECU pinout.pdf

hmm not sure wat to do now . could get expencive having to do injectors?

[Leighos]

Nah you'll be sweet if you stick with an ECU from a standard WRX or Forester, you only need to upgrade injectors if you're running an STi ECU and turbo. I might have a spare Forester ECU if your interested, PM me.

What Turbo are you currently running? Mine is just a VF10 and it goes quite well running on the greys and Mines TT ECU!

[rex-leggy]

 Leighos said:

Nah you'll be sweet if you stick with an ECU from a standard WRX or Forester, you only need to upgrade injectors if you're running an STi ECU and turbo. I might have a spare Forester ECU if your interested, PM me.

What Turbo are you currently running? Mine is just a VF10 and it goes quite well running on the greys and Mines TT ECU!

i was runing a vf8 .got a downpipe made.

but i bew the turbo up on sunday (guttd!!) theres a nasty noise from the turbo like the bearings gone.

so im looking at replacing both now. i might aswel do the lot now ae? save me from having to do it later haha

ive put up on the wanted thread that im looking for a turbo to but dont no weather to go for a tdo4l .

anyone know anything about these turbos . is it better than a vf8?

[Leighos]

A TD04 is smaller than a VF8, about the same as a VF10 so it spools up quick quite low down but then runs out of puff at higher RPM. Theres a few TD04's selling on TM, in fact I just sold one last week for $60!

[rex-leggy]

after somthing bigger i think

[ReubenH]

Well the whole point of upgrading to 3-plug is the injectors and tune of the STi 3-plug ECU's

I'd only go with a fozzy ECU if you planned on upgrading to the STi and yellows later.

Oh and get a VF39 au, they haul (i got mine for $300 from a guy named paul, i can give you contact details if you want)

[Leighos]

 

I'd only go with a fozzy ECU if you planned on upgrading to the STi and yellows later.

That's what my plan is - convert to 3 plug and use a standard WRX/Forester ECU while I still have my EJ20H (std cast pistons etc) in the car, and then when my forged STi engine rebuild is complete I'll upgrade injectors and use an STi ECU with a decent turbo.

[rex-leggy]

 ReubenH said:

Well the whole point of upgrading to 3-plug is the injectors and tune of the STi 3-plug ECU's

I'd only go with a fozzy ECU if you planned on upgrading to the STi and yellows later.

Oh and get a VF39 au, they haul (i got mine for $300 from a guy named paul, i can give you contact details if you want)

keen if it fits? wat sorta setup would i need ? and wats a vf39 out of?

[pl0x]

Yea go bigger than td04

[ReubenH]

VF39's out of the USDM 2.5L STI till 06 i thinks. It pretty much has the same flow rates at the VF22 as far as i've seen. TBH, if you could find something like a VF24, that would probably be a very good option.

[rex-leggy]

nothing on trademe really damit