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Old 03-30-2008, 10:35 PM   #1
[nemesis]
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Default EJ25 Standalone ECU Plug-&-Play

Hello all,

Over the winter, I and my brother-in-law have been laying the groundwork for our latest project: a plug-and-play Megasquirt adapter board for my 1998 Legacy GT

Some technical details:
The 1998 Legacy GT and Impreza 2.5RS had a common ECU. The wiring harness and connectors for these cars are different from the normal Impreza and Legacy and therefore have NO plug-and-play aftermarket standalones available including AEM etc, at least to my knowledge.

So, I bought a spare ECU and we have begun building a system that will fit inside the stock ECU case and can be swapped with a stock ECU at will for emissions purposes.

Today we got the ECU connector and cam sensor signal conditioner completed:

The stock ECU. Notice we have already removed the wiring connector from the PCB.


Me soldering the pins into prototype board.


All done. Notice some solder bridges between pins. This is intentional.


The board fits perfect in the case. We have to cut it to fit the Megasquirt board inside with it...it fits perfect as well.


I added a circuit to decode the variable reluctance cam sensor signal because the MegaSquirt only has one built-in decoder circuit and the Subaru 6/7 system requires both crank and cam signals.


That's all for now folks.

We plan on producing these professionally once these are complete. There will be systems onboard to control the rad fans, and A/C cutout at WOT. We do not plan on doing EGR or EVAP control at this time but we are considering adding a microprocessor to control emissions stuff at a later date.
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Old 03-30-2008, 11:15 PM   #2
LateApex31
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Sweet project! Keep the thread updated so we can see your progress Are you using MS1 + MSnS Extra or MS2? I hear good things about the MSII decoder code but I haven't run it yet.
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Old 03-30-2008, 11:51 PM   #3
[nemesis]
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Plans are to use an MSII extra, mounted in the stock case along with my conditioning circuitry. My eventual plan is to hopefully be able to create actual plug-&-play MS2 ecus for sale, using actual PCBs. Once this one is completed and working, I would like to start making them for various subarus.
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Old 03-31-2008, 08:56 AM   #4
Einimas
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What do you use hammer for?
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Old 03-31-2008, 10:26 AM   #5
[nemesis]
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Quote:
What do you use hammer for?
Not this project... lol
I've found that you need a slightly gentler touch with electronics of this nature...
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Old 03-31-2008, 07:30 PM   #6
kgb
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No kidding about gentler touch - It's good that the MS2 comes in a daughter board since it's SMD. The GPIO board in my opinion has the biggest potential for any PnP projects just because it's essentially the same CPU as an MS2 with the IAC control and a lot more flexibility on the IO pins. I think MegaSquirt has mature enough for the serious Subaru DIYers to consider, but until a critical mass of community support is built, it will be relegated to a fringe player at best to not-recommended for Subaru at the worst. Watch out if you're just making custom board without using the main board (V3 / V3.57 / GPIO) because it will become an intellectual property issue with B&G.
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Old 03-31-2008, 11:14 PM   #7
[nemesis]
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Quote:
Watch out if you're just making custom board without using the main board (V3 / V3.57 / GPIO) because it will become an intellectual property issue with B&G.
Actually, if you look carefully at the board in the pics, there's a red line where I plan to cut the board. I am going to mount a purchased MS2 board across the case, and tie all my custom circuits into it. That way, I'm not infringing in any way, and am also guaranteed that it will work right (lots of brains in them there designers)
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Old 04-01-2008, 01:12 AM   #8
kgb
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Didn't notice the red line - thought you just put the MS2 board on top of it. I personally prefer to use the GPIO board just because I have more control over the pins and can integrate more circuits onboard, but then again, I need to run the stock ECU in parallel
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Old 04-02-2008, 10:11 AM   #9
Einimas
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Any updates?
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Old 04-06-2008, 01:08 PM   #10
Storm
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Very interesting. Keep up the good work! If you need another 98 ECU, I'll send you one of mine! (hint-hint) :P

Jay
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Old 04-07-2008, 09:47 AM   #11
[nemesis]
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Sorry for lack of updates... I am currently in the USA (live in Canada) with the engine apart in the parents garage.... Some genius shop the previous owner took it to decided that a 30.5mm exhaust valve was just as good as the 32mm. ::rolls eyes::

Quote:
Very interesting. Keep up the good work! If you need another 98 ECU, I'll send you one of mine! (hint-hint) :P

Jay
We do plan on building more of these, but I want to make sure it works well and has all the kinks worked out before I sell any of them. I will NOT be the guy who sells products before they're ready just to make a quick buck. If and when I start selling them, I want my customers to be happy. That said, as soon as it seems ready, I'll make sure you're the first to know.
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Old 04-12-2008, 05:22 PM   #12
rdodger
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This looks awesome...keep up the good work guys
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Old 04-12-2008, 08:39 PM   #13
turboed22
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yeah keep us updated! I will also be very interested
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Old 04-16-2008, 04:33 PM   #14
[nemesis]
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Currently working on getting the car to pass import inspection, along with a safety and emissions test. Will be back working on this hopefully within a week.
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Old 04-21-2008, 02:51 PM   #15
lanichol
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Default 2001 Sohc Ej25

I need to find a wireharness and ecu for a 2001 SOHC EJ25 for an aircraft project. Are there variation on the ECU and do you have any suggestions?

Larry
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Old 04-21-2008, 03:57 PM   #16
turboed22
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Quote:
Originally Posted by [nemesis] View Post
Currently working on getting the car to pass import inspection, along with a safety and emissions test. Will be back working on this hopefully within a week.

Any updates?
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Old 04-22-2008, 11:58 AM   #17
[nemesis]
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Default Importation

Unfortunately, I was misled by the customs officer, who told me that I could pay the import fee online and print off the form required to import. It now appears that it will be at least 10 days until I even get the form required to have the inspection done. Until that happens the car is off the road. I may end up posting a HOW-TO on importing a car, as things aren't quite as straightforward as they appear to be.
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Old 04-23-2008, 03:31 PM   #18
turboed22
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Quote:
Originally Posted by [nemesis] View Post
Unfortunately, I was misled by the customs officer, who told me that I could pay the import fee online and print off the form required to import. It now appears that it will be at least 10 days until I even get the form required to have the inspection done. Until that happens the car is off the road. I may end up posting a HOW-TO on importing a car, as things aren't quite as straightforward as they appear to be.

Haha thats funny. Hey are you guys using the factory crank trigger wheel or are you welding a new one on?
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Old 04-24-2008, 10:23 AM   #19
[nemesis]
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Quote:
Hey are you guys using the factory crank trigger wheel or are you welding a new one on?
Yes we are going to be using the MS2 Extra Beta code to do 6/7 crank/cam decoding. The circuit in the picture is for the cam part of the system, and the crank will be done with the MS2 onboard VR circuitry. Plans are to make this completely plug-n-play if possible, meaning no modifications will need to be made to the engine. We may not be able to completely achieve this, as we still may need to add an intake air temperature sensor and MAP line, but we're going to get as close as possible.
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Old 04-24-2008, 10:35 PM   #20
turboed22
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Quote:
Originally Posted by [nemesis] View Post
Yes we are going to be using the MS2 Extra Beta code to do 6/7 crank/cam decoding. The circuit in the picture is for the cam part of the system, and the crank will be done with the MS2 onboard VR circuitry. Plans are to make this completely plug-n-play if possible, meaning no modifications will need to be made to the engine. We may not be able to completely achieve this, as we still may need to add an intake air temperature sensor and MAP line, but we're going to get as close as possible.
MAP works so much better for turbo cars! I need to free up the space in my engine bay for intake and it will run much smoother with a venting BOV. My maga squirt friend said he wants to use the 6/7 wheel so I hope you guys can figure it out!
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Old 04-29-2008, 10:43 AM   #21
bmeyette
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For aircraft use, the best ECU I know of would be the Racetech SDS
http://www.sdsefi.com/
There are about 25 of us who bought Eggenfellner STi firewall forward packages, which turned out to be a horrible mess. One of the fixes we are considering is switching to Ross Farnham's simple programmable ECU. It looks like the ideal solution for us, except it requires a manual throttle body. Our Yahoo group is
http://groups.yahoo.com/group/EggenfellnerSubaruSTI/
although we don't use it much any more and mostly just email among ourselves.
The SDS includes the harness.
HTH,
brian

Quote:
Originally Posted by lanichol View Post
I need to find a wireharness and ecu for a 2001 SOHC EJ25 for an aircraft project. Are there variation on the ECU and do you have any suggestions?

Larry
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Old 05-06-2008, 09:03 PM   #22
turboed22
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You guys have any updates? I could really use one of those for the race season haha
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Old 05-07-2008, 12:16 AM   #23
qtr_wrx
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Wow, I cann't wait till I get my hands on this P&P harness
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Old 05-26-2008, 08:46 AM   #24
[nemesis]
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Sorry for the long wait guys. I've been waiting on the government to get their act together on my paperwork for import. It's finally straightened out, and my emissions test along with safety should be completed today, getting the car on the road. At this point, finding a job is priority, but as I already have the components needed to build my accessory circuitry, I should get back to building within the next little while. I'll try to do a better job of keeping you updated as things go along.
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Old 06-10-2008, 07:05 PM   #25
turboed22
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Any updates?
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