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Twin -> Single conversion in a B4

Started by ams, Jul 21 2009 12:58 PM

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#1 ams

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Posted 21 July 2009 - 12:58 PM

Not really sure where else to start this thread, but "electrical" will do. 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. Thanks blokes! (and maybe ladies). - Alex.

Ugh i could ramble on for forking days about this stuff.

#2 fatcat67

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Posted 21 July 2009 - 03:04 PM

Not really sure where else to start this thread, but "electrical" will do.

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.

Thanks blokes! (and maybe ladies).

- Alex.

In speaking to Al about the same conversion, it was mentioned that using a V7 STI ECU would do the trick with either some repinning or just replacing the B4 loom with the V7 loom.
Piece of the proverbial PI55 mate. No retune needed on the factory ECU, just a reboot.
As Tony Montana would say:
In this country, you gotta make the money first.
Then when you get the money, you get the power.
Then when you get the power, then you get the women.

#3 ams

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Posted 21 July 2009 - 03:18 PM

V7 = bugeye onwards, correct?

Ugh i could ramble on for forking days about this stuff.

#4 fatcat67

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Posted 21 July 2009 - 03:43 PM

V7 = bugeye onwards, correct?

Correct.
I just can't remember whether the V7 STI came out without AVCS heads. I think AVCS started in V8.
Someone with some more knowledge on that may have the answer. Quick search on Rexnet should provide the answers.
As Tony Montana would say:
In this country, you gotta make the money first.
Then when you get the money, you get the power.
Then when you get the power, then you get the women.

#5 ams

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Posted 21 July 2009 - 04:22 PM

Thanks fatcat. Will have a search and report back.

Ugh i could ramble on for forking days about this stuff.

#6 aekOne

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Posted 21 July 2009 - 05:06 PM

AVCS came out on V8 AUDM and on V7 for JDM

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#7 ams

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Posted 21 July 2009 - 05:15 PM

AVCS came out on V8 AUDM and on V7 for JDM


...and I have what exactly on my B4?

Ugh i could ramble on for forking days about this stuff.

#8 aekOne

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Posted 21 July 2009 - 05:37 PM

pretty sure the Gen 3 B4 didn't ever have AVCS. It wasnt until the gen 4 B4 & GT Tuned by STI that AVCS was introduced to the legacy/liberty so if you were looking for a ecu i'd be keeping my eye out for V7 (AUDM) or V6 (JDM)

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#9 ams

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Posted 21 July 2009 - 05:40 PM

So, I'd need (hypothetically) a V7 STI ecu...not V8? I'm still asking around getting as much info as possible, but that helps - thanks aek + fatcat.

Ugh i could ramble on for forking days about this stuff.

#10 Hypnotic

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Posted 21 July 2009 - 06:25 PM

sorry to hijack and im sure this has been covered many a time before but at least on here most actually know what your talking about....can you still use the standard b4 transmission with the say wrx or sti engine, im aware that sti trans would be better anyways but again sort of a hypothetical :) cheers and again sorry for the jack.

As soon as she hands it to you, slowly take of your pants, then, while staring her straight in the eyes rub it against the tip of you penis, while continuing your painfully intense gaze whisper to her;
 
"My eye is watering, this might be a bit hot"

I should just convert to single, right?
 
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#11 fatcat67

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Posted 21 July 2009 - 06:30 PM

sorry to hijack and im sure this has been covered many a time before but at least on here most actually know what your talking about....can you still use the standard b4 transmission with the say wrx or sti engine, im aware that sti trans would be better anyways but again sort of a hypothetical :) cheers and again sorry for the jack.

They are the same as a WRX/STI gearbag anyway just different ratios.
As Tony Montana would say:
In this country, you gotta make the money first.
Then when you get the money, you get the power.
Then when you get the power, then you get the women.

#12 cracka

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Posted 21 July 2009 - 06:37 PM

b4 's no AVCS , bug eyes onward do.
Nothing left to break .

#13 Hypnotic

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Posted 21 July 2009 - 06:40 PM

thanks for that frank

As soon as she hands it to you, slowly take of your pants, then, while staring her straight in the eyes rub it against the tip of you penis, while continuing your painfully intense gaze whisper to her;
 
"My eye is watering, this might be a bit hot"

I should just convert to single, right?
 
Horsepower Factory

Revzone Auto Tuning Centre

#14 jzk25

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Posted 22 July 2009 - 06:36 PM

V7 STi all have avcs. V7 WRX JDM have avcs but aus do not. V7 STi does not have tumblers, all WRX have them. JDM V7 STi is the best ecu to get, it has a good tune and no immobiliser or tumblers. AVCS is an issue if you are just converting your B4 engine and not replacing it with a complete STi engine. 01 Forester is also a good choice of ecu as it has no avcs or fuel pump controller(and no imm if jdm).

#15 alexGT

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Posted 22 July 2009 - 07:15 PM

b4 's no AVCS , bug eyes onward do.


bugeye STI not bug rex's..

MY07 GT spec B

 

#16 B4TT

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Posted 23 July 2009 - 12:07 AM

V7 STi all have avcs. V7 WRX JDM have avcs but aus do not. V7 STi does not have tumblers, all WRX have them.
JDM V7 STi is the best ecu to get, it has a good tune and no immobiliser or tumblers. AVCS is an issue if you are just converting your B4 engine and not replacing it with a complete STi engine.
01 Forester is also a good choice of ecu as it has no avcs or fuel pump controller(and no imm if jdm).

Nice info, so which ECU would be the choice of someone wanting to just rip off the twins and throw a single at it?

 

#17 jzk25

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Posted 23 July 2009 - 06:41 AM

Probably just Aus WRX or 01 GT Foz. You would have to reflash it to forget about the tumblers though. Still requires some rewiring though, you would not get away with just blindly plugging it in and crossing your fingers. I always remove all the unwanted TT wiring pins when doing a conversion as well as checking the pinout of both thoroughly.

#18 B4TT

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Posted 23 July 2009 - 08:30 AM

Fly to Perth and do Alex's car :D

 

#19 Murf B4

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Posted 23 September 2011 - 04:29 PM

Probably just Aus WRX or 01 GT Foz. You would have to reflash it to forget about the tumblers though. Still requires some rewiring though, you would not get away with just blindly plugging it in and crossing your fingers. I always remove all the unwanted TT wiring pins when doing a conversion as well as checking the pinout of both thoroughly.

u have to transfere one of the 02 sensors on the b4 pinout to suit the bugeye pin

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Next Dyno will be 400+ :)
 

#20 Delete This Account

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Posted 23 September 2011 - 04:37 PM

u have to transfere one of the 02 sensors on the b4 pinout to suit the bugeye pin

You love digging up the old technical threads and helping out. Good on you I say.
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