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Ok, holding off. I know that the 94-mid95 models had a different arrangement with how the tachometer was fed. They use a signal directly from the coils. Trying to compare notes with other aftermarket ECU's to see how they set it up. Since it's something that happened during 1 model year it's relativ...

After a bit of hunting for the right pin. I confirmed a healthy 11.55 volts on that line. Will rig something up tomorrow for testing.

Same for grounding 1L to test coolant fan relay activation.

http://www.thefrontloader.com/wp-content/uploads/2014/06/359582.jpg It runs, as russian mentioned the final trick was inverting the pins. It started right up, while cold no less. The maps need work but where a great start. Got a nice solid idle. It smelled rich. What led me to the problem is that I...

Hi, Idea #1 and #2 will be tested tomorrow. Idea #3, no cold welds as far as I could tell on the ignition drivers. Traced everything down to the stm board pins and out to the breakout area. Ground works, one curious thing is I found continuity between the 12V_CONST line on the connector to Vdd _AND_...

More testing with the board in the car. There seems to be an issue with the ignition, the coils do not seem to be firing when the ignition switch is on the start position. It seems to fire when the engine is rotating and the switch run position, but not cranking. This happened under after any amount...

Hi everybody, I've started this thread to document work on my 1994 miata. This is more or less a continuation of this thread http://rusefi.com/forum/viewtopic.php?f=2&t=706 but in a proper spot. Car: 1994 Mazda Miata, stock (engine anyways) Objective: A good ecu for N/A applications. Board: Fran...

Russian, Thanks, will probably check the injectors tomorrow night or saturday morning. Will SMS you after everything checks out to see if you're available so we can try for a start. Re: Cooling fan, it's going to be a must for driving it around. Here we can still see 32 degC during the day :( . No r...

Hey guys, Time has been at a premium this week. Wish I could dedicate more time to rusefi but I have my family visiting for the week. I managed to get some time to plug the ECU into the car. Didn't get around to starting it but verified that critical systems are working. Here are my findings until n...

Ok. Info pm'd. Will keep trying to get it to work tonight.

Hi guys, I've been a little distracted, death in the family and people flying in from all over. I've managed to sqeeze some time to play around with the board. Still not mounted on the car (hope to do that this weekend). I hooked up the board to the provided USB TTL dongle. I got the following after...

My board is here!!!

Thanks russian. Everything looks good, still have to program it and run tests. But its here!!

Will have some questions as I work through programming and testing. Stay tuned!

Edit: It's already programmed. Just wanted to add that the boards come pre-flashed.

Low side drive? Still catching up on the hardware. Going to the glossary later to figure that out. Are there enough outputs to run the A/C relay and the fan relay? The fan uses a relay (one speed) so as long as the output can drive the relay it should be fine. The way I see it a typical cycle runs l...

Thanks tomiata. Will be building my toolchain during the week. kb1gtt - This is where I found the schematics http://www.miataforumz.com/1990-200-Miata-Wiring/94sys.pdf The AC schematic is the first one. Lists 4 wires going into the ECU. The pressure sensor and temp sensor as anded to the a/c switch ...

I've added a prototype area to the known issues list. Which is prompt me to consider it before the next spin. Thanks for the suggestion. Awesome, I think it's going to open the door for some good stuff. As for the spreadsheet, I've done my own. I based it off the table in the miata wiki page. I've ...

Hi guys, thaks for the warm welcome. kb1gtt, thanks for those links. The 1st was was especially helpfull. russian, from the errata for the rev 0.1 frankenso i see that it's mostly silkscreen errors and pin inversions but should be made to run. If the 0.2 board is not set in stone I would have one fe...

Hi everybody, I live in PR and own a 1994 EUDM miata. I'm interested in getting my car running on the Frankenso board (from the looks of it hardware wise it should just drop in). Objectives: My ultimate goal is to get a fully programmable ECU as good as or better than stock. However I've read faqs a...