Subaru Legacy single turbo conversion

First start after the engine rebuild and single turbo conversion (from twin turbo). Now running a V3/4 STi engine in a 1998 Legacy GTB. Engine built by Possum Bourne Motorsport, using JE pistons, Scat rods, ARP Headstuds and an 89 GT Closed deck 2 litre block. the conversion is using a V3 STi ECU, V4 STi intake manifold, V2 RA Exhaust manifold, and rage 3" catless downpipe. It's a bit noisy since there is no exhaust attached to the downpipe yet!

Category:

Autos & Vehicles

Tags:

• Twin
• turbo
• conversion
• 1998
• subaru
• BG
• legacy
• gtb
• sti
• version
• exhaust

[3000ollie]

its a v3 sti ecu for the GT-B but does any one know what ecu is used for a GT conversion? any help would be great thanks

[ReubenHorsley]

@3000ollie It depends what GT. A BG5A (93-96) or a BG5B or C (96-98)

The B's and C's are the same, provided the car is a manual, they will have the same 3-plug engine loom, but the compression ratio in the EJ20H may be different, a standard WRX ecu may be better.

If it's an AUTO B or C, then you're stuck, as they have a 1 plug loom. My advice is to sell the car and buy a factory manual.

[ReubenHorsley]

@3000ollie If its the older BG5A generation, they have a different loom again, a unique 4-plug loom. You will have to do allot of re-pinning and convert it to a 3-plug loom in order to single convert. And again, you'd need a WRX or Forester ECU.

Do note, the Manual GTB has yellow injectors and orange AFM like the STi's, but the GT's have EJ20H's, with grey inectors like the V3 and 4 auto wrx's, and wrx wagons.

Go to clubsub.org.nz and have a look there, there's A LOT of info!

[ReubenHorsley]

Using a VF39 for the turbo, all the other single turbo bits are from Version 3 and 4 STi's. Using a V3 STi ECU, it plugs right in. All you need to do is wire it so the legacy coil on plugs work as a wasted spark setup like the impreza's

[Scottimousprime]

Man, epic conversion! I have a 99 RSK and want to do a single conversion. How hard is it to wire and get a version 4 engine working? Cheers

[liberty2nv]

what did you ditch the twins for? what ecu is running the show?

[method55]

Sounding good, gotta love that boxer rumble...congrats on the swap, 'method' from WRXFanatics.

[morgdogs]

give it a rev, so whens the first drive going to be? sounds good.