This week I've spent some time soldering the rest of my megasquirt together. Previously I had soldered the Stimulator and only the power supply section of the MS.
MS power supply:
Testing the Power supply:
Once the input section of the MS was soldered, I could then test with Megatune on a PC:
This shows the Output section of the MS built:
Underside of the board showing the MAP sensor:
Just a few more components to finish the main MS board. I need to cut the holes in the end of the case, then I can solder the LED's in and the MOSFETS. I also need two small bolts to hold the MAP sensor in place and test the Output circuit. It should be all completed except for any changes that MSnS Extra requires.
Side notes: I've jumpered the D8 diode on the board as per the instructions as I have no idea if my ignition has a large offset bias... The XG1 and XG2 connections are currently jumpered, I'll cut that link too down the line if I need to. For the sensors: For the R4 (IAT sensor bias) resistor I've used a 2.49k value resistor and ordered the corresponding GM IAT sensor. I was hoping to use a sensor more readily available in the UK but didn't know what to go for so I went the safe option for the moment. Finally R7 (coolant sensor bias) I've used a 2.2k resistor as mentioned in the instructions for a Bosch sensor. As it's an aircooled engine I'll use a Bosch CHT (I'll take the one of my current D-Jet Type 3 engine). I assume the instructions are refering to a modern watercooled sensor so I'm guessing as to wether my 30 year Bosch CHT has the same resistance... if not I'll swap the resistor or use EasyTerm to recalibrate (more reading!
Went parts hunting yesterday, as I'm in London I there aren't that many salvage yards these days. Quite a few of them have shut done as enviomental laws have tightened up over the last few decades. The one place that still exists around here didn't have all the parts I needed so I only managed to grab an EDIS coil pack. There's a Ford parts place in the town center local to me so I may have to buy the parts new.