FT500 SFI / FT500LITE SFI
30
FT500 connection on previous FT installation
9. FT500 connection on previous FT
installation
FT500 / FT500LITE can be installed on vehicles that were already
using older FT ECUs without the need to rewire everything. However,
a few points must be checked and changed.
The best option is to perform a new installation, with FT500 /
FT500LITE original harness, following the recommendations contained
on this guide. This eliminates any possibility of bad contact or
electromagnetic interference, pretty common on older installations.
WARNING:
All the wire colors and numbers mentioned in this are
referred to FT250 FT400 and aux wiring harnesses.
9.1 Connection on an FT200, FT250, FT300, FT350
installation:
when using an installation originally done to one of these FT500
/ FT500LITE, it is
mandatory
that of 16-way harness of FT400
installed. It has important power ground wires (black/white wires)
that must be connected to the engine block/head.
If FT500 / FT500LITE is powered without this harness, it can suffer
serious damage, not covered by any kind of warranty.
Besides that, modifications shown below are also mandatory.
9.2 Connection on an FT400 installation:
As FT400 has the same connectors that FT500 / FT500LITE, (16
and 24-way), only a few modifications are needed in order to make
its harness fully compatible with FT500 / FT500LITE. The FT400
reduced auxiliary harness can not be used with FT500 / FT500LITE.
In this case, the complete auxiliary harness must be used.
1-3-4-2
Firing order:
200,
250,
300,
350 and
400 default
FT
FT
FT
FT
FT
1-2-3-4
1-3-2-4
Engine setup 3/6
Custom
1-4-3-2
Firing order
When setting up the firing order on FT500 / FT500LITE under “Engine
setup” menu, select the option “1-2-3-4...” (At the top of the screen,
the indication “FT200, FT250, FT300, FT350 and FT400 default”
is shown).
24-way connector (previous FTs Main harness)
Yellow wire #4 (pin 8)
: on FT500, this wire, that on FT400 had
the function of an auxiliary output, is now the RPM differential input.
That`s why the recommendations below must be followed:
The function that was auxiliary output #4 must now be reallocated to
yellow #7 of the 16-way connector (any other output can be used).
The connection of the wire that stays in the motor must be changed
as follows:
Yellow #4 must be connected in one of the ways shown below:
VR Differential:
that`s the most recommended option, cause makes
the RPM sensor readings most protected against electromagnetic
interference.
Connect the yellow #4 wire on the pin where the shield (from the
shielded cable) was connected before. Now, the shield must remain
disconnected.
Select the option “VR Differential” on the “RPM Signal” menu, under
“Engine setup” menu.
VR internal reference
: option used only to keep the harnesses
compatible with fewer modifications on the crank trigger sensor
connections.
Leave yellow #4 wire disconnected;
Select the option “VR internal reference” on the “RPM Signal” menu,
under “Engine setup” menu
Hall Effect sensor/distributor
: leave yellow #4 disconnected and
select the option “Hall” on the “RPM Signal” menu, under “Engine
setup” menu.
Yellow/red wire:
on FT500 / FT500LITE this wire, that used to be the
MAP analog output on FT400, is now an output used as an injectors
output (blue #3). By standard, MAP signal output is now on Orange
#2 wire (pin 3) of the 16-way auxiliary harness, but, it can be set
up on any other output.
16-way connector (FT400’s auxiliary harness)
ETC – ground output for throttle and pedal sensor (green/black
wire, pin 11):
on FT500 this wire is a power ground input and must
be connected to the engine block/head.
On FT400 this output is used as a ground for throttle and pedal
sensors, so, change the wiring and connect these sensors directly
to the
battery’s negative
and connect the green/black wire to the
engine block/head.
Electronic throttle:
on FT400, electronic throttle control is done
through 4 wires (brown/white 1 and 2 and purple/white 1 and 2).
On FT500, only two of them will be used:
• Brown/white #2 (pin 13) = “motor 1” wire
• Purple/white #2 (pin 14) = “motor 2” wire
Wire brown/white #1 (pin 15) and purple/white#1 (pin16) must be
removed from the electronic throttle connections. They can be used
as auxiliary outputs (set up on the ECU first). On FT500 / FT500LITE
they are, respectively, the yellow #3 (pin 15) and yellow #4 (pin
16) outputs.
