For this to be more accessible to people (lots of car hackers may not be electronic hackers), I think there would need to be something pretty easy to assemble. Like a ready-made PCB that fits as a shield on the Arduino, and with "PNP" connectors/adapters for some common cars (i.e. Miatas).

I saw someone in Sweden bulk-buying boards, I'll try to get one from him to build a "lab unit" to at least play around with.

That's exactly what is coming. It'll be a full SMD board that comes assembled with (at first) the 48-pin Miata/MX5 connector. Optionally it'll come with a case similar to the one in my picture and the Arduino attached. Hoping to hit somewhere around $200USD for the whole thing, but there's a lot yet to be confirmed for that.

I was thinking it'd be nice to make a board with the processor on it (what's on a UNO card aside from 3 chips?)... You're going with a processor only card?

Yeah for the moment I'm sticking with the external Arduino board, though a couple of guys have made their own boards with the processor on them.

The bizarre economics of Chinese mass production means I can't even buy the 2560 processor chip for the price I can get an entire Arduino Mega for. And the mega board includes the USB-serial interface as well.

In case anyone here is still interested, I've recently finished the design work on the 48-pin PNP version of Speeduino and sent off for a test batch of these. Plan is that once tested, I will be having a run of these assembled and will be selling them as a complete unit in case etc. This board will become the next version of the general Speeduino, but for ease of testing for myself I decided to do a NA6 PNP version first. Will have a few of the extra Speeduino features that the earlier boards didn't such as an easy bluetooth interface, flex input etc.

https://www.miataturbo.net/attachmen...ine=1467676379

Cool stuff! Looks like the TO-220 MOSFETs and the voltage regulator have all been replaced with IC's, I guess that makes the arduino+speeduino stack a bit thinner. I have a Speeduino 0.3.2 that I initially tried to fit inside the original ECU case, but it was a little bit too tall. Also, having cables on screw terminals at both ends + a simple adapter pcb on the 48-pin connector made it a basically impossible fit (so I'm making a simple case out of plywood or something). This is for a Mazda 323 BG, but it seems to have the same ECU as the NA6, at least physical dimensions.

What I'm getting at is, this thing could fit nicely inside the stock ECU case. Removing the board out of that is just a matter of a few screws, and would make a really nice way of mounting the Speeduino. Will need a couple holes drilled for the vacuum line + whatever extra cables there are, but that's a pretty easy deal.

It wasn't specifically designed for this, but it may well be possible. Once I've got a board actually assembled and in my hands I'll pull out a case and see how it goes. There may be some issues with the shape, in particular around the connector.

Yeah, I think the geometry is a bit wrong to fit in the case, with the 48-pin connector on top of the speeduino board and the arduino under it. It would also be difficult to make neat access to the USB port on the arduino board, being just under the connector.

I've made a couple custom enclosures before with a 3D-printed frame (with holes in the right places for connectors and cables), and top and bottom from plywood or acrylic (laser-cut or just plain squares of it). It can be really sturdy and pretty nice looking. Wouldn't be too hard to make something like that with brackets to be able to mount it properly in the same place.

Been a while between updates, but so much happening on this project for anyone interested. First Miata running full sequential is now out and about and there's been a bunch of new features such flex fuel support etc added over the last few months.

I ran into a few design issues with the PNP boards, but they're back on track now and hopefully the final test boards are on their way now. I'm hoping to have a design completed for the 64-pin plug shortly soon too, so if anyone wants to test one of those just let me know.

What s/w are you using to tune?

It's all through Tuner Studio, so you get most of the features that it comes with in terms of logging, offline tuning, autotune etc.

Are you running a wideband with it?

Yep. I'm personally running a 14point7 unit, but have used an Innovate in the past as well. There's a whole heap of calibrations available for different wideband units.

Assuming the testing works out, what kind of price point are you looking at?

Will be under $200 USD for an assembled unit (ie in case etc), but just not quite sure how far under $200 at this stage.

Ok, so slow progress, but things are getting there. My car is up and running now on one of these units and I've mocked up the casing etc that will be used in the final version. Still a bit of testing to do, but it's definitely getting there.
Attachment 237248
Completed, fully functional board.

Attachment 237249
Mockup of the enclosure and faceplate. This is an early 3d printed faceplate just for testing, but the final version will be a laser cut alloy piece.

Wow
I'm really impressed
Can't wait to see the development, it can the sostitute of my old MS, great!

Any update to this?
ETA?

I am willing to be a guinea pig if you need one. I'll even pay the $200 for the opportunity to possibly blow a non-finalized one up.

Final testing on the current board was done today and everything checked out except the clutch input. I have to double check tomorrow that this wasn't caused by the trans neutral switch though.

Next step will be a small run of fully assembled boxes. Probably 5-10 of these depending on interest and price is still TBA, but will definitely under $200. They've had a lot of testing on 2 vehicles now and are proving to be rock solid reliable, but I need a wider audience to test with at this point.

I'll update again shortly when I'm about the send the run for production.

did you get anywhere with this?