FT500 SFI / FT500LITE SFI
80
Drag race features
Disabled
Enabled
Time based driveshaft (cut) 1/4
Driveshaft RPM
Speed (traction)
Speed progression range
20
Kmh
[kmh]
+
-
Time based driveshaft (cut) 2/4
3
1
Speed
[kmh]
75
55
1,10
0,50
Time
[s]
57
0,00
2
Speed based ignition cut
[%]
+
-
Time based driveshaft (cut) 3/4
3
1
Cut
[%]
70
50
2,70
1,00
Time
[s]
60
0,00
2
Ignition cut curve
The first screen will briefly explain how the feature works and it will
ask what the speed reference is, if it is a wheel speed or drive shaft
RPM. You must have a wheel speed sensor or a driveshaft RPM sensor
enabled to use this feature.
The first parameter to be set is the speed/RPM progression range,
which is the Speed/RPM range from start the ignition cut to its
maximum level.
A 10 Mph speed progression range means that if your control starts
at 80 Mph, the ignition cut maximum level will be at 90 Mph.
The next screen is the wheel speed/driveshaft RPM versus time table.
After the 2-step, every time the speed/RPM goes above the curve, the
ECU will perform ignition cuts.
Percentages less than 90% may not keep the engine under the rev
limiter. Bigger RPM progression range tend to stabilize more smoothly
the rev limiter, but allows the RPM to pass the RPM set as rev limiter.
For inductive ignition systems it is recommended to use 90% maximum
level and 200 RPM progression range. For capacitive system, like
MSD, it is recommended to use 100% maximum level and 1 RPM
progression range.
10000
9000
8000
7000
4000
0,00
0,50
1,00
1,50
2,00
3,00
Time based driveshaft (cut) 4/4
2,50
6000
5000
Time based speed (retard)
This feature reads the wheel speed (or the driveshaft RPM) and applies
ignition compensation, according to the two RPM curves (A and B)
to control launch.
The basic idea is to retard the ignition timing, reducing power to
the wheels. When the wheel speed reaches the programmed in the
“speed curve A”, the ECU starts the programmed retard in the “delay
curve A point”.
As the speed increases, and goes toward the curve “B” speed, the
retard applied to the timing (that is interpolated between the two retard
Disabled
Enabled
Time based speed (retard) 1/6
Time based speed control allows
the car to regain traction
through a timing retard ramp.
Driveshaft RPM
Speed (traction)
[s]
+
-
5
3
2
Speed
[mph]
5500
1,25
3,00
2,50
5000
Speed curve A
3700
4
0,55
3500
1
0,00
3800
Time
[S]
Time based speed (retard) 2/6
mph
+
-
5
3
2
Speed
[mph]
120
0,45
1,50
0,95
55
Speed curve B
15
4
0,25
15
1
0,00
5
Time
[s]
Time based speed (retard) 3/6
The first screen allows to select the speed/RPM reference (wheel
speed or driveshaft RPM). You must have a wheel speed sensor or a
driveshaft RPM sensor enabled.
The next screens will show the speed/RPM curves A and B.
[°]
+
-
5
3
2
Degrees
[°]
+2,0
3,00
2,50
-2,0
Retard curve A
4
0,55
-8,5
1
0,00
-10,0
-5,0
1,25
Time
[s]
Time based speed (retard) 4/6
After this, the ignition retard curves A and B
Time based speed (retard) 6/6
0,00
1,00
2,00
3,00
4,00
5,00
6,00
7,00
10000
8500
7000
5500
4000
2500
1000
Time based speed (retard) 6/6
0,00
1,00
2,00
3,00
4,00
5,00
6,00
7,00
10000
8500
7000
5500
4000
2500
1000
Chart curves
OK
Speed A
Speed B
Retard A
Retard B
[°]
+
-
5
3
2
Degrees
[°]
+2,0
3,00
2,50
-2,0
Retard curve B
4
0,55
-8,5
1
0,00
-10,0
-5,0
1,25
Time
[s]
Time based speed (retard) 5/6
1 - Green speed curve A;
2 - Purple speed curve B;
3 - Pink timing retard curve A;
4 - Blue timing retard curve B;
5 - Buttons for chart selection that will be in the upper layer;
6 - Check boxes to enable or disable graphic display;
In the end, a graph will be displayed with all the curves (speed/RPM
A and B, retard A and B)
Note that the speed and retard curves shown on the graph form speed
and retard zones. They have the following characteristics:
•
When below the curve A, there is no retard applied to the engine;;
• When the speed/RPM is equal to the programmed curve A, the
ignition retard is equal to the programmed in curve A;
curves) is incremented. Thus, if the initial retard made by curve A is
not sufficient to hold the speed of the vehicle, the retard will increase
as much as the RPM increase.
In cases where the speed/RPM exceeds the limits of the curve “B”,
the maximum retard (entered in curve B) will be applied.
1
6
5
4
3
2
