FT500 SFI / FT500LITE SFI
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9.3 Ignition calibration
The ignition calibration screen on FT500 / FT500LITE 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 “Engine setup” menu.
When using distributor, the ignition must be calibrated on this screen,
instead of turning the distributor.
FT500 connection on previous FT installation
Ignitio calibration screen: FTManager x FT500/FT500LITE x FT400/
FT350
Ignition calibration
1 ,
23 0
°
23
Teeth
- 0
3, º
Adjust calibration
until match 20 at
timing light
Lock timing
0°
20°
Fix timing at 0° or 20°
to calibrate ignition
Degrees for distributor calibration or crank
triggers with no gap (ex: 2, 8, 12, etc.)
FT
FT
350 and
400 screen
FT500 screen
Ignitioncalibration
Cancel
Save
Compensate until it reads 20°
-
+
-3,00
°
Crank Index Position
-
+
20
Tooth
BTDC
IgnitionSetup
Save
Cancel
9.4 Injection time differences between FT500 /FT500LITE
and previous FT ECUs
Some differences may be observed when tuning a FT500 / FT500LITE
based on a previous FT ECU map (FT200, FT250, FT300, FT350
and FT400).
Injection mode:
on previous generation ECUs, injection mode was
“alternated”. Injectors are fired once per 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 / FT500LITE 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
FT500 / FT500LITE 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 / FT500LITE
maps, even taking the above into consideration.
