The memcal or calpack or netres whatever you want to call it is like a super basic backup chip that can run the engine if the main chip fails. Its the chip that operates the engine when its in limp...

The 1227747 ecm is just a computer to help process the data. When you customize the actual chip with tunerpro that is where you can change how many cylinders the engine has, fueling, spark etc. So im...