The Single Turbo Conversion Thread 2.0

[KarlGTB]

Cheers, I hadn't noticed the BG one. They're almost identical except for the twin turbo crap.

http://i197.photobucket.com/albums/aa208/Pilot_Reuben/Single%20Conversion/V3-4Awiring.jpg

http://i197.photobucket.com/albums/aa208/Pilot_Reuben/Single%20Conversion/V3-4CBwiring.jpg

http://i197.photobucket.com/albums/aa208/Pilot_Reuben/Single%20Conversion/conversion19.jpg

I think the ignition should be sweet, if not I guess I'll know straight away. Not sure about the BCS but that will be easy enough it'll either work or it'll be stuck on wastegate pressure.

Clutch and down pipe to buy then in to it, can't wait.

[scottiescottiescottie]

Just one question... I got a V4 manifold but looking at it all I am pretty sure I just reuse the wiring from the TT manifold right?

[mattapo]

yes

[scottiescottiescottie]

thanks... now to sell some engine loom...

[gazzy2000]

 Mattapo said:

yes

TL;DR

[scottiescottiescottie]

TL;DR???

[Joker]

To Long : Didn't Read

[kamineko]

http://www.google.co.nz/search?q=TL%3BDR

[4foot]

ok so here we go, Ive got a 2001 twin with what i thought was a ej206 engine allgood so ive got all the bits together for a single turbo conversion including a v4 or 5 ecu which is what ive been told i would need for the car to go, catch 101 it turns out its actually the ej208 engine in my car does anyone know if the v4 or 5 (just cant remember) ecu will still work????

[kamineko]

don't have the specific answer to your question but,

V1/V2 is generation 1 impreza ecu

V3/V4 is gen 2

V5/V6 is gen 3

the wiring and expected sensors are different for each pair.

i think you will have compression matching problems with the newer legacy engines, i don't have the info but believe them to be higher than the expected 8:1 / 8.5:1 ratio of the STI blocks. The STI ecu is tuned for lower compression and will not play nicely with the high comp blocks.

find out more about your engine then look for a suitable ecu to suit, aftermarket may be your only option. gazzy2000 may know, he had similar problems

[mattapo]

so you have a revD?? If so get a wire in link

[Jimbob]

quick question for those that have done the bg5a conversion,

my powersteering pump has a plug on it, had a wire & ecu connection on the TT loom + ecu etc

but on the 3plug ecu/loom there is no wires for it. is this ire a warning system or is it required for me to have powersteering?

cheers

[kamineko]

IIRC its function is a PS pump load signal so the ecu bumps up the engine to compensate at idle

i don't remember it existing in the v3/v4 setup, in which case you can ignore it.

[Jimbob]

coolies explains why only 1 wire then

[4foot]

 Mattapo said:

so you have a revD?? If so get a wire in link

Na its a rev C

[tydon]

hi im currently doing the twin turbo to single turbo conversion on a 4 plug BG5a . i have all the parts from a 1992 legacy wagon and have pretty much bolted it all onto the TT block. I wasnt able to use the same intake and ended up with a ver1 rex intake i have noticed that the TPS different what ways around this???

change Throttle body?? or loom on intake?.

i know it says on the coversion to use a 3plug ecu and yellows etc.

but i have a 4 plug ECU from the 1992 legacy whch i have already started repinning.

does anyone have a better copy of the ECU pinouts i can use???

[gazzy2000]

 tydon said:

hi im currently doing the twin turbo to single turbo conversion on a 4 plug BG5a . i have all the parts from a 1992 legacy wagon and have pretty much bolted it all onto the TT block. I wasnt able to use the same intake and ended up with a ver1 rex intake i have noticed that the TPS different what ways around this???

change Throttle body?? or loom on intake?.

i know it says on the coversion to use a 3plug ecu and yellows etc.

but i have a 4 plug ECU from the 1992 legacy whch i have already started repinning.

does anyone have a better copy of the ECU pinouts i can use???

Pin outs and wiring diagram https://skydrive.live.com/?sc=documents&cid=cfa30f34a9604d4a#cid=CFA30F34A9604D4A&id=CFA30F34A9604D4A%21161&sc=documents

I have a 1s ECU for sale, 3 plug WRX as per the pin out docs in the above links. 1s ECU runs yellows, orange AFM and is made to run a VF22, far better ECU for teh TT to ST and i have used one of these in the same conversion myself. PM me if you interested.

ALso might have a v3/4 manifold with the engine loom (under manifold) with the right angled IACV etc

[tydon]

hi thanks for that i will be eventually changing to bigger turbo just want it running for now have you got a contact number would be very intrested in those parts seeing as i already have yellow injectors.

[Jimbob]

last trick to my bg5a conversion

di i need to rewire the ignitor, and do i do it before ore after the ignitor, this is for waste spark btw

cheers

[4foot]

so Ive single turbd my Be5 legacy has turned out mint conversion was done over one weekend with only the small tidy up bits done beyond the weekend .. little things like bolting the ecu back down etc... running the GFB EBC set at 13.4 psi running a v5 or v6 non sti ecu v7 silicon intake sleeve using the standard intake box about to replace the air filter for a free flow panel filter. Using a V7 fuel pump (it sounds cool not sure if it really does anything flash, not really bothered), full redline 3" exhaust, semi tuned length extractors.

and thats my story haha big ups to GAZZY2000 the electrical guide was extremely helpful !!! followed it step by step only thing that wasnt done was the fuel pump relay so the pump doesnt prime and stop it just primes haha.

cheers

[Jimbob]

hmmmms

i dont seem to have a tacho, what would cause that?

on a bg5a w/ v3/4 setup with 1s/orange/yellows

cheers

[mattapo]

You didn't wire up the tacho wire

[Jimbob]

whats tacho on a 3plug setup i can find it on the 4plug ecu pinouts

[kamineko]

from page 1 of this conversion thread

 ReubenH said:

I stumbled accross a good pinout for the 4-plug ECU's, this should hopefully make thing's easier.

You can grab it from my server here.

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

And for reference:

97-98 ECU pinout.pdf

[Jimbob]

cheers,

some reason i was looking for tacho on one but was labled engine speed duhhhhhh

grrr anyone done the afm rewiring from blue to orange?

cheers in advance