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10.3 Ignition calibration
The ignition calibration screen on FT500 has the same parameters that previous FT ECUs, the difference is that
they are in the same screen. After calibrating the ignition, the 1st tooth index position is automatically changed on the
10.4 Injection time differences between FT500 and previous FT ECUs
Some differences may be observed when tuning a FT500 based on a previous FT ECU map (FT200, FT250,
FT300, FT350 and FT400).
Injection mode: on previous generation ECUs, injection mode was
crankshaft revolution (360 degrees), composing with 2 injection pulses the total fuel needed per cycle (720 degrees).On
Multipoint or Semi sequential modes, the injectors will still be fired only once per crankshaft revolution, keeping similarity
with the previous map. The difference comes when sequential mode is selected. In this mode, injectors are fired only once
per cycle (720 degrees), delivering the total fuel needed in just one pulse.
In sequential mode, it is necessary to understand that the main fuel map and the cranking injection will have fuel
injection times near twice the ECU had before. Example: a map where the idle speed used to have 2.40ms + a 1.00ms of
injector deadtime, will have something around 3.80ms (2.40 x 2 1.00) on sequential mode.
Injector drivers: FT500 has a new model of injector control driver that brings more precision and speed on
opening and closing of injectors. This difference for the previous generation of FT ECUs makes saturated injectors able to
close 0.30ms earlier, requiring that the injection time (when compared to maps from old generation FT ECUs) be
increased in 0,30ms. This doesn`t mean an increase in the fuel amount, only a difference in the tuning. When using Peak
and Hold drivers, this difference doesn`t exist.
It is very important to say that there`s no direct map conversion between previous generation ECU maps and
FT500 maps, even taking the above into consideration.
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