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Old 04-07-2009, 11:53 PM   #1
gryffinwings
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Question Turbocharging Piggyback ECU options?

Other than the E-manage Ultimate and the Perfect Power 6, what other options are recommended for turbocharging? I've seen the Turbo XS Utec for decent prices.
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Old 04-08-2009, 12:14 AM   #2
PhilSine
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98 OBS-T, 91 Legacy SS

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You could buy a JDM WRX ECU with the connector and a small section of the wiring harness still attach and splice it into your existing wiring harness.

I'm not sure how that would work for your state and emissions though. Anybody know enough about the JDM GC8 ECU's and if they interface with teh OBDII port the same?
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Old 04-08-2009, 12:19 AM   #3
gryffinwings
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Oh yeah I forgot to add that I have a 2001 Subaru Outback with the EJ25 SOHC Phase II motor. Would that even work, It seems rather doubtful.

Anyways the car is registered in Washington State, since I'm in the military I can get away with keeping the registration there while I'm in San Diego, CA.
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Old 04-08-2009, 12:40 AM   #4
PhilSine
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It will work. If you compare the sensor voltages between the JDM EJ20G and USDM EJ25 you'll notice they are very similar. Most are exact and the few that differ are not in what the sensor produces for signal but rather what the EU reacts to.

I'm not sure that it would work for the SOHC EJ22E's but since the engines we're comparing for you are both DOHC, it will work.
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Old 04-08-2009, 12:50 AM   #5
gryffinwings
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Ummmmmm.... I have a Single Over Head Cam 2.5 liter non-turbo engine, how you said that was kind of confusing. So your saying a EJ20G has an ECU that will possibly work with my EJ25 SOHC engine when Turbo charged, is that what your saying?
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Old 04-08-2009, 01:27 AM   #6
PhilSine
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I didn't know you had a SOHC engine.

I'm not sure if the WRX ECU will work because of cam timing. I'm not 100% certain that the cam timing is the same for the SOHC as it is for the DOHC. It should work since the firing order is the same as is the function of the cam as far as how the timing is electronically set.

Be nice if we could find somebody that's done it.

I'll be building an EJ257/WRX hybrid engine for my OBS in which I plan on using a JDM ECU to run it but the WRX heads are both DOHC with respect to JDM vs USDM.
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Old 04-14-2009, 12:46 AM   #7
reddevil
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How much money you want to spend?
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Old 04-14-2009, 09:05 AM   #8
Odyknuck
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My Buddy is running a DOHC 2.5 JDM motor in his Offroad car and he is using a SOHC Forrester wiring harness and ECU. The wiring harness has been modified to elimanate the unnessarary devices like speed sensor and Evap canister however that would not effect the way the ECU handels the timing etc. So I would say it would work. The only thing to verify would be the number of teeth on the the trigger wheels.

Quote:
Originally Posted by PhilSine View Post
I didn't know you had a SOHC engine.

I'm not sure if the WRX ECU will work because of cam timing. I'm not 100% certain that the cam timing is the same for the SOHC as it is for the DOHC. It should work since the firing order is the same as is the function of the cam as far as how the timing is electronically set.

Be nice if we could find somebody that's done it.

I'll be building an EJ257/WRX hybrid engine for my OBS in which I plan on using a JDM ECU to run it but the WRX heads are both DOHC with respect to JDM vs USDM.
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Old 04-14-2009, 06:28 PM   #9
master c
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theres the AEM F/IC piggyback
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Old 04-15-2009, 04:21 AM   #10
Kevin Thomas
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Why not just get a fuel controller, such as an SAFC? Run 92-93 octane (Whatever is available), adjust your fuel tables to emulate what your EGT (Exhaust Gas Temperature) would run stock and keep moving.
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