Read http://www.phearable.net/tech/efibeginnerguide.html
It will educate you concerning the engine management situation.

Concerning running into limp mode, this doesn't randomly happen unless you have an engine computer failure or major component failure which would happen if a motor was naturally aspirated anyhow. What you need to understand that the only reliability difference between an all motor vehicle and turbocharged vehicle is the actual hardware that is added to the engine such as the manifold, turbo, charge piping etc. The distributor still functions the same, the map sensor still functions in the same method along with all of the other sensors.

Most people have reliability issues with turbocharged vehicles because they:
1. Don't buy quality parts.
2. Install everything incorrectly.
3. Skimp on tuning
the list goes on...