FT500 SFI / FT500LITE SFI
54
Starting the engine for the first time
Ignition calibration with distributor:
On the engines originally
equipped with distributor, there’s a TDC mark for cylinder #1. Point
the timing light and turn the distributor until the timing light reads
20°. Lock the distributor then press “OK” button on the ECU. Ignition
calibration is finished
Ignition calibration with crank trigger:
Cars originally equipped
with crank triggers, usually do not have the TDC mark. This mark
then should be done by stopping the engine on cylinder #1 TDC of
compression using a dial-comparator. It is very important to be precise
when making this timing mark; the slightest error will ultimately affect
ignition timing on the engine
In these systems, usually the ignition is controlled on wasted spark, with
one spark on the combustion stroke and one on the exhaust stroke.
As the timing light reads both sparks, it usually shows 40° BTDC of
timing, but the actual timing is 20° BTDC.
As it is not possible to turn the crank trigger as we do on distributor
systems, the ignition calibration screen has a compensation that
must be changed until the timing light shows 20° BTDC (or 40°,
according to the timing light). Let’s say you read a timing of
24°BTDC, a compensation of -4° is needed to read 20° BTDC on
the crankshaft TDC mark. When the timing light is reading double the
real timing (wasted spark), if the timing on the timing light is 46º, the
compensation that must be set is -3º, instead of -6º.
To check if your timing light is reading twice the real timing, advance 5°
and check the timing on the engine again. If the timing has advanced
10°, the timing light is reading double the real timing.
17. Fuel tables adjust
17.1 Main fuel table
Editing mode for main fuel table is on 2D basic mode by default,
but it is possible to switch to advanced 3D mode. To change this
parameters, in the FTManager, go “Advanced map options” in the
“Engine settings” menu.
On FTManager, it is possible to edit the map cell ranges of MAP/TPS,
RPM, etc., making it possible to increase the detail level on the maps
where a fine tuning is needed. To do it, simply click on “Edit axis” on
FTManager tool bar.
Basic Mode - 2D table
In the basic mode, the engine is tuned according to the MAP sensor
or TPS. By default, the main fuel table by MAP is from -14.5psi up to
the desired pressure.
When the main fuel table is by TPS, the table is from 0 to 100% in
10% steps.
Through FTManager, it is possible to use up to 32 cells, which will
allow to have a better map and a fine tuning.
Main fuel injection table
-0,09 bar
Bank A ( %)
1
Bank B (0%)
1,345
ms
0 000
,
ms
Advanced Mode - 3D table
In the advanced mode, the main fuel table is a 3D table, where the
injection time os calculated according to the MAP sensor (or TPS)
and engine RPM. As well as the basic mode, the MAP range is from
-14.5psi up to de desired pressure. When the main fuel table is by
TPS, the table is from 0 to 100% in 10% steps.
The default RPM steps are 200rpm until 3000rpm, and above this
rpm the steps are in 500rpm. The MAP, TPS or RPM steps can be
edited via FTManager.
Main Fuel Injection Table
20000
RPM
19375
-0,80
ms
+
-
0,000
0,000
0,000
-0,90
bar
0,000 (000%)
0,000 (000%)
B
A
17.2 Overall fuel trim
The overall fuel trim recalculates and replaces all values of the main
fuel table according to the percentage configured. This functions can
be accessed through “Fuel tables” menu.
When using individual banks, the trim will be available to each bank.
This compensation applies a percentage that can add or remove
fuel from the main table (basic or advanced mode). For example, if
in a certain cell the injection time is 2.000ms, representing 50% of
injector opening at maximum rpm, and you aply 10% compensation,
the result will be 2.100ms, representing 55% of injector opening, if
the dead time is 1.000ms.
