NA Engine Control Unit tuning and Diagnostics

[longassname]

I haven't been working on it. The economy is so bad I haven't been able to invest the time to finish it. Presumably I will finish it eventually since it is mostly done and I have I think 500 of the interface pcb's in a box somewhere and a couple hundred kitted up for assembly already. I don't know when though.

[soobrdad02]

I understand the economic issue all too well, just keep us updated on any progress! I, for one, would love to get my hands on one of these!

[longassname]

I still haven't gotten a chance to add in the functionality for table editing and emulation but I've posted the interface and software so people can go ahead and use the select monitor functionality for checking and clearing codes, adjusting sensors, etc. You can also download your firmware and start building a community library of all the versions out there. I'll leave it up to the community and site admins to figure out how to structure things and start developing a knowledgebase so you can start helping eachother and buidling upon eachothers findings and experience.

The interface is inexpensive. The software is free to use and when I get a chance I will add in the rest of the functionality and release the source code with some sort of copy left license scheme. Please don't email me for support. There's just no way I'll be able to hold anyone's hand. It's going to be up to the more apt users here to help the less apt.

It's at: http://www.ecutune.com/ECUtuner.htm

[speedmaxx]

I just read a bit on the first page and I'm hooked! I want one these!!! I need to find an easy way to tune my turboed ej22 legacy.

Can we get a estimated date of when these are gonna be available? I wana be first in like for one

[longassname]

It's available now! Download your free software and buy your interface at http://www.ecutune.com/ECUtuner.htm

[speedmaxx]

okay so let me get this starit, this is basically like a full on stand alone in the sence that it will alow me to tune all the different sensors? like for example does it let me advance or retard the ignition timing? how about altering my air fuel ratio? does this system alow me to do so?

Im assuming this will be great tunning adition to my turboed na legacy?

lmk Ill probably be ording this tonight

[longassname]

No no no no no

OBD1 cars are not flashable...

You can not edit the firmware in your control units. You can download it. You can then edit it to make the changes you want to make. Then write the modified firmware to a ROM. Then install the ROM into a memory adapter. Then install the memory adapter into your control unit--at which point you have modified your control unit to do what you want.

The ECUtuner software and interface handles the communicating with your control unit so you can monitor everything like you can with the dealer diagnostic equipment (subaru select monitor) and so you can download your firmware. To actually modify your firmware you need much more understanding of what you are doing and much more hardware.

The ECUtuner software will in the future provide a user friendly interface for modifying your firmware after you have downloaded it but I have not finished that part of the software yet.

[speedmaxx]

Okay sweet, thanks for clearing that up.

[Legacy777]

Michael,

Thanks for the update. As people use the software and download the code for the ECU's we'll try to use this thread as a central repository for the data unless you would prefer it not to be in this thread.

[longassname]

Whatever works for you guys Josh,

A note on the ej22t: While I don't have a copy of the firmware and havne't made a definitions file for it you can still use the ECUtuner software and interface to download the firmware. Once we have the firmware I should be able to identify at least the most important ROM locations pretty quickly and get you started down the road towards tuning them.

[longassname]

I'm going to make some rudimentary instructions soon and will include this there when I do but for now......

There are some computers now that may have .net 4.0 installed without any of the prior versions of the .net framework installed. For some reason unknown to me (and some other programmers like at amd/ati) these computers will throw an error when you try to run some .net applications specifying earlier versions of the .net framework in their config files. You need to have the earlier versions of .net installed to run the ECUtuner application. If you have such a computer you can download the complete .net 3.5 installation package which includes 2.0, 3.0, & 3.5 from microsoft using the following link: http://download.microsoft.com/download/ ... etfx35.exe

[Legacy777]

Thanks for the update Michael.

[Ductech]

I realize this is my first post But when I saw this thread I couldn't help join said forum to give you a "hey good job" pat on the back. I really wish I would have come across this post before buying a Megasquirt. Live and learn right. Well on a side note, Have you guys had luck tuning your ecu's using this jumpered rom method?

I also was wondering on an off chance that maybe you guys might have access to some information that I have had to guess on so far. I am mostly wondering about what the injector latency that subaru has programmed into these earlier legacy's I am in the us, and have a '91 ej22 from a legacy awd auto, in a porsche 914. I have had a hard time finding info for the injectors on this stock motor. I have the motor reasonably tuned on megasquirt controlling only fuel in conjunction with the stock legacy ecu. With the intake mods and exhaust i built (no cat) the car ran damn lean untill the 02 sensor kicked in. Now with the megasquirt and a wideband its a much more drivable car. I would love to further get this squared away by getting a more realistic idea of the stock injector latency at nominal operating voltage.

Thanks for the help, figured one of you guys might be able to pull this value out of the stock firmware. Thanks again. Subaru's rock by the way.... best motor I have ever had in any car..... I hate v8's and grew up on vw's so the subaru is like a super vw motor the inbetween old aircooled piles of metal and sweet watercooled 911 twin turbo boxers,

Longassname, I hope your project is paying off for your hours of investment. And good on you for engineering a package to tune the stock setup on a obd1 car nobody else has seen a market to do that really, from what I had determined till now!

[longassname]

Thanks,

Well no it isn't a worth while market. I'll never make any money from releasing this. I just hope some people start using the ECUtuner interface and software to download their firmware so we can get a good library of the firmware for you guys.

The injector latency is one of the ROM locations in the definition files I have provided for the legacy. Anyone with the ECUtuner interface and software could easily pull that value out and tell you what it is. Even better as soon as someone downloads their firmare and posts it here for us then it will be available for all of us.

[soobrdad02]

So could I use this as a scan tool?

[Legacy777]

I believe so. Also, here's another option that is out there for a while is http://bbs.legacycentral.org/viewtopic.php?t=16219

[longassname]

By scan tool you mean can you check trouble codes with it? Yes you can check trouble codes and clear them and monitor all sensor data just like with a Subaru Select Monitor like the dealer would use.

[soobrdad02]

And now for the big question...will it run on my Mac?

[longassname]

Nope, it is a windows ap

[OddBallRacing]

longassname: first of all, wow, thanks so much for all this work!!! I hope that I can put your hard work to use for my current project. Here's the mind-bender, perhaps you can advise:

I have a 1996 Impreza Brighton (EJ18, GM body) that, unless you can advise/help otherwise, I hope to run with a stock 1992-4 Legacy turbo ECU. I am retaining the stock EJ18 wiring/sensors/coil/etc. but have swapped out the intake manifold, heads, and injectors with the Legacy items and have added an aftermarket WRX (EJ20) exhaust manifold/TD04 turbo/aftermarket downpipe. I have also upgraded the fuel pump to a Walbro WRK item.

My intention is to make a jumper harness to connect the Legacy ECU to the Impreza wiring harness using pin-out diagrams I had printed out of AllData.

The Impreza is indeed an OBD-II car. I don't expect this port to work with the Legacy ECU jumpered in.

Do you think your chipping tools/skills could be used to save me some trouble and hack my stock Impreza ECU -OR- hacking the Legacy ECU so it would play nice with the Impreza MAF/IAC/TPS/etc.?

Thanks once again for your hard work and dedication!

Karl

PS there is a build thread on NASIOC in the NA with bolt-on section, FYI.

[OddBallRacing]

Nearly a year bump. Is this topic dead?

[longassname]

I don't necessarily remember exactly what I have and haven't posted but to sumarize: The ECUtuner interface is for sale at : http://www.ecutune.com/ECUtuner.htm where you can also download the ECUtuner software to use for free. The definitions file to configure the software to work with a legacy ECU are there to download as well. All the functionality of a Subaru Select monitor and more is functional in the ECUtuner software; however, I haven't gotten around to completing the tabs for table editing to provide a user friendly interface for making modifications to the firmware nor have I gotten around to emulator functionality to enable real time tuning.

With the information provided in the definitions file anyone serious about tuning a legacy ecu could do so. There doesn't seem to be much interest and activity in tuning Legacy ECUs. I expected a lot of forum members would have purchased the interface and used the ECUtuner software to check and clear trouble codes and perform diagnostics and adjustments on their cars and that the forum would have a public repository of all the different versions of firmware out there by now. That never happened.

[Legacy777]

I think the majority of the focus is on the turbo legacies, so the non-turbo ECU's haven't gotten the attention like they may if the legacies were only offerred in a non-turbo model. Kind of like the SVX.

[SILINC3R]

Well I just bought the interface and the USB plug for my 90 LS. I recently put a full exhaust on and am having AFR issues so hoping I can use this to help fix that. Also plan to get an SVX in the future so this will be a good starting relationship with ECUtuners.

[Legacy777]

Cool! Well let us know how you like it and how it works.