PCM options

racerjoe said
I'm running the MS3X on a 5.7 right now. I had it previously running my 408 LA. Since I made the harness and bulkhead connector for the 408, I simply made the harness and pinout to match. A simple config change and it fired right up. I will admit the MS was a big learning curve for me since I hadn't messed with any EFI at that point. I've considered moving over to the Terminator X, but honestly, there's no point. I feel like the Terminator is a good setup for guys that aren't familiar with EFI and don't need a bunch of extra I/O. In order to match the I/O of the MS3X on a Holley system, you would need to go with the Dominator or get a CAN expansion module. If money is no concern, go with the Dominator. Overall, I'm happy with the MS3X, but I want even more analog inputs and have considered getting a microsquirt to use as a CAN I/O extender.

Depending on how handy you are with electronics and code, you could pretty easily build your own. I have an Arduino currently running a small column mounted display and have gotten fairly familiar with how the MS CAN works. I have debated using some of the extra inputs on it (or buying a whole separate one) to get extra inputs into my MS. The biggest idea I've had for a while now but haven't gone through on is building a dedicated "sensor unit" that I could mount in the engine bay and wire all the sensors to. Then I would just have the CAN lines to pass through the firewall instead of all the individual sensor wires. I still have a ton coming back out to run sequential injection and the coils, but it could reduce my pin counts quite a bit. Right now I have one ~20 something pin bulkhead that is just sensors and a second one for the injectors and coils. The MS is a little limited on CAN channels though, and I'm not sure if it would play super nice with that idea or not.

But an Arduino Nano and a CAN bridge of some variety would likely only run you $20-25 and would give you something like 5 analog inputs, 10 digital inputs, and the option to use some of those as outputs instead if you wanted. I'm currently emulating part of the JB Perf board to send GPS and RTC data from my Raspberry Pi back to the MS for logging.