OBD Tuning is very difficult for the home user - since an OBD reader can only request a couple of items of data per second so the OBD connection is little more than a diagnostic tool there is nowhere near the bandwidth required for proper realtime tuning diagnostics.
Most manufacturers have devised their own way of programming the ECU and retrieving information but they all have to support the OBD standard as a legal requirement so if you get the right map for your engine and electronics it can be flashed through the OBD port but even the same engines come with slightly different sensors and settings on different years so you have to be really careful which one you choose to flash with.
Many factory ECU's have security codes and these must be over-ridden before a new program is accepted. Mis-flashing can fry your ECU so be very careful. ECU's with Boot sectors are a little more forgiving but it is still risky business. |