FT20 TECHNICAL MANUAL

Perfect Power Online Manuals.

 

Support for your FT20 Unit.

FULL INSTALLATION

This section provides information on pin locations for all units, as well as details of wiring in the harness for optional connections.

 

 

FT20 CONNECTIONS

 

FT20 Fuel Tuner - FT20 Connections and Pin-Out

 

 

FT40 CONNECTIONS

 

 

FT20 Fuel Tuner - FT40 Connections and Pin-Out

 

 

FT60 CONNECTIONS

 

FT20 Fuel Tuner - FT60 Connections and Pin-Out

 

 

CONNECTOR PIN ASSIGNMENT

MAIN 10 WAY CONNECTOR (FOR OPTIONAL WIRING)

 

Pin Function Description Wire Colour
1 On/Off Short to Switch OFF Brown
2 Map Switch Short to activate MAP B Pink
3 Air Temperature 0-5V Orange
4 TPS Input 0-5V Yellow
5 GND Chassis Black
6 +BAT (12V) Supply (Needed with RPM sync) Red
7 SYN Input Required to extend RPM Limit Purple
8 AMP (MAP) Input 0-5V Grey
9 Eng Temp Input 0-5V White
10 GND Chassis Black

 

 

2 CYLINDER INJECTION 12 WAY CONNECTOR (REPEATED UP TO 6 CYLINDERS)

 

Pin Function Description
1 GND Chassis
2 - NC
3 ECU INJ #2 ECU Injection
4 GND Chassis
5 - NC
6 ECU INJ #1 ECU Injection
7 BAT #2 Common supply to injectors
8 INJECTOR #2 (A) To Injector #2
9 INJECTOR #2 (B) To Injector #2
10 BAT #1 Common supply to injectors
11 INJECTOR #1 (A) To Injector #1
12 INJECTOR #1 (B) To Injector #1

 

 

POWERING THE FUEL TUNER WITHOUT THE ENGINE RUNNING

 

 

The FT can get operating power from three sources :

 

  • From the injectors : The injector power may be switched off when the engine is not running.
  • From the 10 Way connector Pin 6 : This wire can be connected to any fused 12V power point, which is switched off when the key is removed.
  • From the USB Port : This is the preferred method when operating the unit outside the vehicle.

 


The Fuel Tuner will use the first two power sources, if available. The third power source is useful when you would like to connect the PC, but don't want to run the engine. Connecting to the USB port and the PC or laptop will  provide the power to the unit. When you connect in this way, you are not powering the engine, or activating the injectors, you are just running the electronics.

 

 

 

RECOMMENDED OPTIONAL WIRING

OPTIONAL THROTTLE POSITION (TPS) INPUT (PIN 4 OF 10)

 

Wiring in the TP can be a little difficult, but is highly recommended. It will provide a "Two Dimensional" map. The difficulty is to find the correct throttle position signal  wire amongst virtually hundreds of other wires.

 

 

The definition of the throttle position signal is : "It changes its voltage in unison to the change of the gas pedal." This can be measured with an ordinary multimeter, or with the FT unit.

 

 

There are many ways to go about finding the correct TPS wire :

 

  • Trace the wire (colour) from the TPS sensor to the ECU.
  • Poke a needle into each wire and measure the signal in response to moving the gas pedal.
  • Locate an ECU connector layout from the vehicle manufacturer's service manual.
  • Get help from a qualified vehicle electrician.
  • Ask a Friend.

 


Once the TPS wire has been found, you will then need to TEE the Fuel Tuner Yellow wire into it with the provided TEE-CONNECTOR. If you prefer to do the connection yourself, follow the diagram below :

 

 

FT20 Fuel Tuner - Tee-in the Fuel Tuner Yellow wire into the connector

 

 

 

Try the installation of the TPS wire connection : Once the unit has been powered up, the TPS cursor must move in unison with the gas pedal. You can change the direction and calibration later. See the LetRipp Windows Software Guide on how to use the software to operate this feature.

 


Note : If you don't have a multimeter, you can use the FT input and display the result o a PC. The FT input can be connected to any voltage EXCEPT the IGNITION (high tension!) without causing any harm.

 

 

OPTIONAL MANIFOLD PRESSURE INPUT (PIN 8 OF 10)

 

If a manifold pressure sensor is not used, then a MAF signal will be sufficient. In any event, you need to wire this option only if you would like to change the tuning of the engine by the manifold pressure. This is advised after a turbo installation, or with superchargers. Find the MAP (or MAF) wires the same way as you found the  TPS wire (explained above) and connect to it the Fuel Tuner's wiring harness GREY wire, with the provided TEE-CONNECTOR.

Refer to the LetRipp Windows Tuning Software Guide on how to use the software to tune this input.

 

 

OPTIONAL ENGINE TEMPERATURE INPUT (PIN 9 OF 10)

 

This sort of connection is for the very particular tuner, and when you would like to change the "COLD" behavior of the engine. Locate the engine temperature wire (best done by tracing) and TEE into it with the Fuel Tuner's wire on the optional wiring harness. If you don't need the engine temperature, then leave this wire open.

 

 

OPTIONAL AIR TEMPERATURE INPUT (PIN 3 OF 10)

 

This sort of connection is recommended with inter-cooled engines and is a must with turbo charged installations. Find the correct wire in your engine and connect to it by TEE-ing into it with the Fuel Tuner's Orange wire on the optional wiring harness, as before. If you don't need to use the air temperature, then leave the wire open.

 

 

OPTIONAL MAP SWITCHING INPUT (PIN 2 OF 10)

 

The Fuel Tuner has two complete tuning maps.

 

The second map (Map B) is activated by shorting the MAP SWITCH wire (Pink - Pin 2 of 10) to ground. If left open, then Map A is active. This is indicated in the right upper corner of the display in the LetRipp Windows Tuning Software. This feature is recommended when you experiment with the tuning. It gives you two different  choices of tuning while driving the car on the road. An absolute "must" if you would like to do economy tuning.

 

 

OPTIONAL ON/OFF SWITCHING INPUT (PIN 1 OF 10)

 

The Fuel Tuner has an On/Off function using the Brown wire on the Optional wiring harness. If the wire is left open, then the unit is ON and performs its logical function : it tunes the fuel. If the wire is shorted to the chassis, then the Fuel Tuner will not tune the engine. The OFF state is the same as entering zeros into all the map points in the software.

 

 

CALIBRATION

 

This is the process to adapt the Fuel Tuner to your engine. It requires that you have the respective input wires to the engine and that you can "exercise" or use the input. The Fuel Tuner comes with "PRESET" calibration maps, and you may make use of them. But the displays they provide may be incorrect for your engine or application. Therefore, calibration will be necessary and it is very easy to calibrate the inputs you use.

 

The CALIBRATION is performed via CONFIG, then Calibration in the LetRipp  Windows Tuning Software. Please refer to the LetRipp Software Guide for the detailed explanation.

 

Any additional engine input you can use adds a "Tuning Dimension". We highly recommend to install the :

  • TPS - yellow wire
  • AMP (Manifold Pressure) - grey wire


The more concerned installer may want to install :

  1. Air Temperature - orange wire
  2. Engine Temperature - white wire