Using the 4-Channel Board with MicroSquirt Module

[24c]

Jean
I am not an electronics person, so I have to ask, is there a schematic or a reference page so I can work out my connections to the Module board. I am using MS Extra 3.0.3 and will be using WLED, ALED, PT6 & PT7 as my additional outputs, as well as IGN1, IGN2, ALT_INJ1 & ALT_INJ2 to connect to your board.

@ Anybody else, have you done this already?

[jbelanger]

There is no schematic or reference page at this time.

Using this reference for the Microsquirt module pinout, you will want to connect J2 pins 48 (IGN1), 44 (IGN2), 11 (WLED), 7 (ALED) to the 4-channel board ignition pins 1 to 4, respectively (shown circled below on the left). This will give you spark A, B, C, D on positions 1, 2, 3, 4 on the 4-channel board.

For the injector drivers, you will need to connect the module's J1 pins 4 (ALT_INJ1), 6 (ALT_INJ2), 9 (PT6), 7 (PT7) to the 4-channel board injection pins 1 to 4, respectively (shown circled below on the lower right). This will give you injector channels 1 to 4 on positions 1 to 4 on the 4-channel board. Also, you will need to connect the ground pin on the 4-channel board (rightmost pin identified by GND) to one of the multiple GND pins on either J1 or J2 (all the GND pins are connected together on the module). You will also have to leave out the resistors on injector channels 1 and 2 (R5, R6, R9, R10 crossed out below) since the module already has those when using ALT_INJ1,2. Finally, R7 and R8 will need to be 1K resistors (instead of the kit standard 330R) to match the value used on the Microsquirt module.

You will then want to refer to the DB15 pinout found here to connect the 4-channel board to the coils and injectors. Make sure to connect the coils and injectors according to the firing sequence and not the cylinder numbers. Also make sure to connect all 3 DB15 connector ground pins to a good external ground.

Hopefully I have given more than enough information to make it clear for everyone wanting to do this. If not let me know and I'll try to clarify it.

Jean

[24c]

Jean

Thank you for the clarification, and although I can use my 4 in 4 out external ignition driver and add the DIYPNP twin injector board, I really like the integrated solution that your board offers and the enhancements it gives to the MicroSquirt Module. I have placed an order for a bare board, the IGBTs and the FETs, so I look forward to putting it altogether, and integrating it with the module board when it arrives too.

Thanks
Mike

PS I do not need the DB15 connectors, as I'll be making a custom interface and attaching to the DB15 solder pads directly to my sourced elsewhere Tyco ECU connector, that connects to the existing ECU plug. I only have to add two wires for the additional COPs to the existing motorcycle loom, as it has sequential injection already and runs wasted spark, and fortunately there are some spares available. This is a lot easier than using the cased MicroSquirt Ampseal loom.

[24c]

Hi again, just an update, your board and parts arrived a few weeks ago Jean, thanks very much for the prompt posting. However the Nippon Denso adaptor boards took a little longer, but they have arrived today.

Test fitting the components for the ECU

MicroSquirt Module in ECU case-test fit.jpg (162.04 KiB) Viewed 166 times

I am using one of the diyatotune.com DIYPNP Nippon Denso boards which is cut down, as I only need two not four connectors, your 4 Channel Driver board and a MicroSquirt Module...loads of space, just need wires a few components and some stand offs.

[jbelanger]

That's a nice setup. I guess it's going to look a bit more crowded when all the wires are there but it's nice and compact. Let us know what it looks like once it's completed.

Jean

[24c]

Eventually getting round to this again, and I have got some 8mm stand offs since my last post, but now need some 6mm ones, which I have ordered. I have drilled the base to take the module and the Nippon Denso board.

I am going to fit a small finned heatsink to the 5V regulator on the module board, and wondering whether I should add heatsinks to the ignition and injector drivers? I was thinking of adding/tying Q1...Q4 with a solid extrusion, as I don't have a side or base I can attach them to.

Is this a good idea or unnecessary?

Next question, can you use ribbon cable or is it too thin (current capacity) ? I am looking at using a 2x25 pin with flexible jumpers to make my loom inside the ECU, as I want to be able to swap out/mod stuff later.
Anybody got any criticisms or thoughts?

Thanks (in anticipation of a response)
Mike

[jbelanger]

The need for a heat sink for the IGBTs will depend on your coils and how well you can set the dwell: the higher the maximum current and the longer the dwell, the more they will heat up. But it's definitely not a bad idea and you also want them to be supported somehow because they will vibrate otherwise and that could lead to failure.

As for wiring, the wires from the MS board to the 4-channel board carry very little current so using a ribbon cable is fine. If you also wanted to use that for the injectors and coils then that's not a good idea and you'd want to use something more substantial.

Jean