Hi guy's,

Bit of background - relative newb on perth-wrx, but a bit of a suby forum-whore in general. This question relates to my twin turbo, B4 Lib.

If I was to (hypothetical only at this point) do a twin turbo -> single turbo conversion, would I be able to use a wrx or wrx-sti EJ20 single turbo ECU?

How difficult would it be to replace said ECU? Would the new ECU need to be completely rewired into the car?

Obviously it would need a re-tune after installing, but i'm talking purely about the ECU's ability to do the job needed.

I know its a long shot asking on a wrx forum, but I'm struggling to find a good answers elsewhere. Any help would be appreciated.

Thanks blokes! (and maybe ladies).

- Alex.

Have you been on rslibertyclub.org and liberty.asn ?

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MY93 Impreza GX 1.8L, 0hp, 0nm

Yes, RSLC has some decent info but doesn't say specifically if you can use a wrx or wrx-sti ecu and how hard it is to wire up or if I need a whole new custom ECU.

I sort of asked the same question at the same time on a few different forums

it definately can be done.
how much time do you have for it to be off the road though?

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Long live the WRC

As long as it takes basically...
I've got a run-about bunky so, not time limited at all - why do you ask?

It that time consuming, eh?

Contact Al on RSLC. You can send off your wiring loom to him and for a few hundred he'll re do it so you can simply plug in a Ver3 STI ECU. Then when you get it back you just put it all back into you car and plug in the ECU and off you go.

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RS Liberty - Because WRX's are only good for parts...

if you have the wiring diagram, its not difficult at all.

not sure what ECU you have, but if it is a non-avcs engine, you could probably wire in a 01 wrx ecu without too many dramas.

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Long live the WRC

Yeah Al seems to be the man to see about this sort of thing.

I might contact him directly - thanks for your help guy's.