I have been told that there are two ways to map an EFI. One being to actually change the mapping of the ECU by getting a flash download. The other way is to use a piggy-back modem type device that allegedly alters the signals that are being received by the actual ECU. Provided that this is accurate information, can you please explain what the issues would be if a modem type device were to fail while on the road (i.e. would you cause engine damage if you were to unplug the device and ride home with the modifications still in place)?
From Our Friends at DynoJet
If a piggyback style system were to fail it is possible that your bike would not run until the unit was disconnected from the system. At this point whether or not your bike would run too lean while getting you home depends on your current setup. If we are talking about an exhaust and airbox then the bike would run too lean but not lean enough to cause any type of damage. Any modifications above this are hit or miss.
Wrench Safe, FMH