Hi

Do i need to fully re-map my car if i change my mapsensor from 3bar to 4 bar?

No

You have to rescale the map and change your TOG values. You might have to do some fine tuning once you are up and running but thats about it.

By the Map, Dan means you only need to change the MAP values down the side of your table to what they were before you changed your MAP sensor type in the software. This will ensure that the table is still working in the correct area at the appropriate time.

Rescaling the TOG is required to ensure you're getting the fuel you got before, but now at a lower MAP voltage. So, take your new MAP type (4 bar) and divide that by your old MAP sensor (3 BAR) then multiply your TOG by that result. Do the same to your IOT, but you will end up tweaking that to get Idle back into place anyway.