WestfieldMX5

Probably not many using the MS3 pro module, but I thought I'd show what I'm working on for my '99.
Currently, my MS3 pro module looks like this:





I works fine, but it's kinda a bit of a mess so I'm thinking of making some kind of an adapter board.
Here's where I'm at right now. Map sensor, alternator circuit, usb and serial onboard.

It's far from done because I don't have a stock ecu to take exact measurements from.

Thinking of an internal usb module, but I'm not sure how those modules perform when inclosed in a metal case.
I have installed and external one in my current setup, but I removed the DB9 and the case so this is not really a PnP solution.

Any other suggestions?



Edit: here's an example I just found, to visualise what I'm talking about.

Zaphod

Wow, nice work Frank... keeping an eye on that!

WestfieldMX5

Not having a stock 99 ecu, anyone who can take these dimensions for me?
Also need the diameter of the mounting holes.

G and H are the distances of the solder pins of the connector relative to the edge of the board.

WestfieldMX5

Surely somebody must have a 99-00 ecu board that they can take these measurements from?

Braineack

iTrader: (62)

cool work! no 99-00 on hand, just a 91 and a 97.

WestfieldMX5

A friend asked me to make one for his 91.
Haven't decided yet, but once my own board is done, I might make one for him as well. It'll have jumpers to select between 1.6 and 1.8 to cover 90-97.
Once I have the measurements I can send off my order.

Did some more work in the meantime and updated the picture in the first post.
I won't be using an external bluetooth module or serial cable, so the DB9 is gone.
It gives me more room for a 2nd map sensor (constant baro).
I'll be installing an internal bluetooth module with some double sided tape and 4 wires like my current setup.
There's room enough for extra circuits so contemplating a shift light.

bahurd

iTrader: (8)

I'll dig mine out this afternoon and take the measurements for you. 2000 base model (if it matters).

Check back in about 4-5 hours.

EDIT: Measurements are below;

A = 154.00
B = 159.10
C = 143.84
D = 83.00
E = 65.98
F = 5.00
G = 19.57 (board edge to C/L of pins)
H = 16.92 (board edge to C/L of pins)


Hole diameter = 5.08 (note: hole at intersection of D & E is 4.57, no idea why as all the screws are the same at 3.90) I'd use a 6mm circuit board drill in all the holes

Let me know if there's anything else you need.

WestfieldMX5

Thanks a lot Brian, now I can finish the board

WestfieldMX5

I added the connector for the 90-95 on the other side of the board.
The board now fits both 99-00 and 90-95 ecu cases depending on how it's oriented.
Here's the final design.



I don't have all components in 3D (and some are wrong like the male header pins), but this gives you an idea of what it'll look like

Zaphod

Wow, bloody awesome... Maybe you should put a second baro sensor on this board for Baro correction (not needed in your Country of course... ;-)))

WestfieldMX5

Thanks Sven, I might be able to stuff 2nd MPX4250AP under the module, but I'd probably have to use non-standard header pins to lift the module a couple of mm. With standard header pins, there's probably not enough room, so I added a mapdaddy instead.
OTOH, it never hurts to add one even it means that the people who want one will have to use longer header pins. Mmm, you made me thinking some more about this. If I do this, there's plenty room for all kinds of extra stuff (shift light?)
Back to the drawing board - if I can put everything on hold as I already sent the files of to be made.
Any other suggestions?

EDIT: Followed your advice and added the 2nd map sensor for baro.

WestfieldMX5

I decided to draw a board for the 01-05 & 96-97 as well.
I'm not having them made right away (nobody has asked and I have no need for it), but it's really not that much work now that I have the basis.

If anyone has one of these ecu's, I'd appreciate it if they could verify the above dimensions of the mounting holes.

I tried googling, but I can't even find a picture of the oem pcb's for those years, so I don't know if the holes are in the same position.

Braineack

iTrader: (62)

looks like it's there already...

WestfieldMX5

Lookie what arrived today
This is so exciting!
The board can be used for 90-95 or 99-00 depending on how you orient it.
Putting one together for my 00 and a friend's 91 right now.
Left is for 99-00, when flipped upside down it's for 90-95 (center), right is an oem board for a 91.



Testing the 91 case, perfect fit :-)


Here's the 99 setup, alternator circuit is soldered in, as is the usb connector and the ckp and cmp pullups.
Need to add the mapsensors and header pins for the MS3 Pro module.
The 2 overlapping holes on the left side is because of the different mounting hole in the 90-95 and 99-00 cases.

bcrx7

iTrader: (5)

Looks great!

Braineack

iTrader: (62)

Zaphod

Do like! Props!

WestfieldMX5

Finished the board today, everything fits perfectly

The yellow wires are extra outputs that I'm using. Most people will only need 3 wires (sequential spark and boost).
- spark_c and spark_d
- HC3 as boost control
- CLT output to my S2000 cluster
- AIN2 as oil pressure input
- HC1 as oil warning light output

I had a minimum order of 5 pieces. I'm keeping one for me, so I have the remaining ones for sale if anyone is interested.

More info and options on my website

WestfieldMX5

If anyone wants one of these, I'm selling these for less then what I payed for them.

WestfieldMX5

All boards now sold