The Super X uses the
Sagem MC1000 ECU. The tune information is held in a non volatile flash
memory chip. When you download a tune you are "reflashing" the memory.
There
are several parameters also held in
non-volatile memory which do not change
when a tune is downloaded. They are Leakage
(long term fuel trim), Closed throttle trim, and IACV stepper trim. These
values can be updated using the "Real Time Monitor" within SuperXtune.