v2.2 vs v3.0
If not specified, most megasquirt ecu’s offered for sale use the older v2.2 mainboard. This is because of the lower cost and assembly time due to the basic feature set.
| v2.2 | v3.0 | |
|---|---|---|
| Status | Technically obsolete | Current |
| Board layers | 2 | 4 |
| Copper thickness | 1oz | 2oz |
| Separate signal/power ground planes | No | Yes |
| 5v vref re-settable polyfuses | No | Yes |
| Surge protection | No | Yes |
| Injector outputs | 2 x high impedance | 2 x high/low impedance |
| Heatsink | No | Yes |
| VR conditioner circuit | No | Yes |
| Coil driver circuit | No | Yes |
| Prototype area | No | Yes |
| Bluetooth device support | No | Yes |
| FP/idle overcurrent protection | No | Yes |
| MS2 support | Partial | Yes |
| MS3 support | No | Yes |
http://www.megamanual.com/ms2/pcb.htm
The V2.2 is the simplest and cheapest option but is technically obsolete and does not include the VR conditioner or low-z support. The V3.57 is a pre-assembled version of the V3.0.
http://msextra.com/feature-xref.html