V5-6 engine into a B4 legacy

[sylus]

what would need to be done to my standard b4 RSK in order for this to work? has anyone seen it done before?

[ReubenH]

Take a look here, the gist of it is the same, but obviously you can skip allot buy just buying the complete engine. it's been done a couple of times, no one seems to have/want to share the ECU pinouts though which will detail any minor differences between the looms (such as the ignition wiring). I think cause those who have done it have gone with aftermarket ECU's. It would be great if someone could tell us properly what needs to be done for the BE/BH's

Also, later model BE/BH's got different ECU's. I don't know which is which, and which works with the STi's.

[gotasuby]

99gtb has done it and ive done a couple. they are easy to do and far nicer to drive

[Carbon]

What are the major things to consider (especially wiring) ?

[sylus]

does the gearbox need to be changed if I am to put an sti engine in? clutch? flywheel?

Would there be much difficulty in putting a v7 sti engine in?

[Markmcrs]

 sylus']

does the gearbox need to be changed if I am to put an sti engine in?clutch? flywheel?

No, no and no.

Same clutch and flywheel and the gearbox's are physically the same.

[quote name='sylus said:

Would there be much difficulty in putting a v7 sti engine in?

Yes!

V7 has AVCS and if your car dosen't that means a whole lot of work and you'll need to fit an aftermarket ECU that can run AVCS.

In your original question are you asking about just replacing your long motor with one from a V5/6 sti or are you asking about a full TT>T swap?

Because if it's just the long motor your wanting to put in then there is no need for any wiring/ECU mods at all.

You just bolt all the bits off your motor onto the V5 motor - only tricky part is modifying the LH head to accept oil and coolant feed/return lines for the turbo...

[sylus]

If I buy this short block

http://www.trademe.co.nz/Trade-Me-Motors/Car-parts-accessories/Subaru/Engines/auction-204725185.htm

will I be able to take everything off my engine and fit it to this? so I can keep my car TT but with the option of converting to single turbo in the future when I have the $$$$$?

[gotasuby]

yup it will bolt straight up and work, you might aswell convert it now to make it easier. pretty similar as ruebens conversion thread

[99GTB]

For single turbo or parallel twin turbo...

The ecu wiring requires a few wires to be swapped around and the variable fuel pump control needs to be rewired.

This will allow a v5 / v6 sti ecu to be plugged straight in.

[_rsk_]

How about with engine mounts? Would I be able to just drop in a V5-6 without having to change mounts, etc etc? I'd just need V5-6 loom, ecu and engine right?

[sylus]

what problems would occur if I was to put in a version 4 sti engine?

[subout]

ver 5/6 engine swap would be the easiest as it runs same loom. v3/4 will require you to wire in completley different ecu

[ReubenH]

Yeah but longblock wise, the GTB's manifolds, and sensors etc would bolt on right? Or are the incompatible?

Even if they worked though... the GTB's ECU's tune would not match up with the V3 block. May be a couple of HP wasted there?

[gotasuby]

the manifold has different bolt pattern so your have to use v5+ heads with the gtb manifold

[ReubenH]

Ah well, there goes that idea.

[subout]

thats why v5 conversion would be easiest as manifold, heads etc all match up as well with ecu being very similar pinouts. even if you only used shortblock and used gtb heads, intake manifold etc etc

[Guest]

hey would the cheapest option for this be buy an old rs engine (single turbo) and use the bits off it? but use an upgraded turbo vf22? ive been offered a complete engine 300 bucks with a slight knock

[Guest]

slight knock probably means its roo ted

[Pappu1]

99 b4 has been done with v7 sti engine - needed pretty much loom swap to run the 7 ecu

if u got the engine and loom then yes its not too bad to do