hi. new to the mapping side of cars. normally getting my hand dirty with the mechanical side of things. ive taken a map off my car and also one off a friends. exactly same car, year, engine and im guessing ecu but i carnt use my friends modded one on mine. any reason or stupid question? cheers

Sometimes even the same car or same ecu family isn't enough and there are differences beneath the surface.

what actually happened when you try?

In all fairness even if things had taken, you might have found the car not quite the same to drive as your friends, as daft as it sounds a tunes performance can be very individual to the car its put on.