FiTech 30003 Go Street EFI System Instruction Manual
- June 13, 2024
- FiTech
Table of Contents
FiTech 30003 Go Street EFI System
Product Information
The FiTechTM Fuel Injection system is a throttle body EFI system that is designed to provide advanced performance and ease of installation. It includes a 4-injector throttle body, harness, ECU, injectors, idle air control, throttle position sensor, coolant sensor, handheld controller, wideband O2 sensor, fuel pressure regulator, gasket kit, inlet/outlet fittings and plugs, datacom cable, SD card, and instruction booklet.
This Quick Start Manual is designed to get you up and running with the Go
Street Kit and either the 40003 Fuel Command Center or the 40005 Inline Fuel
Delivery Kit. The FiTech Go EFI System is the industry’s most advanced
throttle body EFI system and also the easiest to install. It includes a very
advanced Handheld Controller but is also capable of being far more tunable
than any competitive product that utilizes a Handheld Controller. Please read
the full instruction manual before beginning your installation.
These instructions cover the Basic Kit installation and setup as well as
general instructions for both of the optional Fuel Delivery Kits. For
technical assistance with your Go EFI System, call
951-340-2624.
Warning: Caution must be observed when installing any product involving fuel system parts or gas tank modifications. Work in a well-ventilated area with an approved fire extinguisher readily available. Eye goggles and other safety apparel should be worn to protect against debris and sprayed gasoline. We recommend having this installation performed by an experienced qualified automotive technician. The finished installation must be thoroughly checked for any fuel system leaks. All safety precautions must be observed when working with fuel. Note: Do not use solid core ignition wires.
Kit Contents
- (1) 4-Injector Throttle Body – Die Cast Finish (30003) (1) Harness “A” (Plug-in pigtail user harness)
- (1) ECU (Mounted on Throttle Body)
- (1) Set of four or eight injectors pre-installed
- (1) Idle Air Control (Installed on Throttle Body)
- (1) Throttle Position Sensor (Mounted on Throttle Body)
- (1) Coolant Sensor
- (1) Handheld Controller w/billet case
- (1) Wide Band O2 Sensor
- (1) O2 Sensor Bung Kit
- (1) Fuel Pressure Regulator (Installed in Throttle Body)
- (1) Gasket Kit
- (2) -06 AN Inlet/Outlet Fittings (Installed on Throttle Body
- (2) Inlet/Outlet Port Plugs (Installed on Throttle Body)(1) Data Com Cable
- (1) 8 gigabyte SD Card (Installed in Controller)
- (1) 3/8-NPT Reducer
- (1) 10mm Port Plug
- (1) Instruction Booklet
About your FiTech Go EFI System
The Fitech Go EFI System will bolt directly to any 4-BBL intake manifold. To
fit on a spread-bore 4-BBL manifold will require an inexpensive adapter plate
to avoid leaks. Note that the FiTech throttle body will bolt directly to a
spread-bore 4-BBL manifold but may leak without the adapter plate. Suitable
adapter plates are available from several suppliers such as Summit Racing
(SUM-G1420). The Fitech Go EFI System is self-tuning once the simple initial
setup is performed using the Handheld Controller. When the necessary initial
inputs are made with the Handheld Controller the Go EFI System creates a base
fuel MAP to get the engine running. Then the self-tuning programming will
fine-tune the MAP to produce optimum power and performance. Through the use of
a wide band O2 sensor, the system can continuously make adjustments in the
fuel delivery to provide the correct air/fuel ratio under all climate and
altitude conditions.
The ECU (computer) is mounted on the throttle body thus eliminating the
necessity of remote mounting the ECU module and the need for an unsightly
harness draped over your engine. Several sensors are also integral to the
throttle body assembly including the throttle position sensor (TPS), manifold
absolute pressure (MAP), intake air temperature (IAT), and a fuel pressure
sensor.
- Initial Programming: This simple procedure is performed using the Handheld Controller. A laptop computer is not required. This unit plugs into the throttle body ECU. After a few initial inputs are made the Handheld Controller can be removed or left connected. When connected, there is a dashboard and gauges screen that will show engine parameters in real-time.
- Fuel Delivery Systems: You may have chosen one of the two optional Fuel Delivery System Kits from FiTech. Instructions come with each kit. If using other fuel delivery components you must use a 30-micron filter ahead of the fuel inlet fitting on the Fitech throttle body.
- Wide Band O2 Sensor: This is the key component of any EFI system. Only one sensor is required. This sensor continuously monitors the exhaust gas mixture and sends the information to the ECU where adjustments are con-
Fuel Delivery Requirements
FiTech offers two different fuel delivery options. One is the 40003 Fuel Command Center. When using this option, you can configure the system to operate on a returnless basis. The other fuel delivery system is the 40005 Frame Mount Inline External Pump. Using this pump the system must have a return line. The Fuel Command Center uses your existing carbureted fuel pump and fuel lines to deliver the fuel to the Command Center which is mounted in the engine compartment. The only plumbing required is from the Center to the EFI. High-pressure hose and fittings are supplied with this kit to plumb from the Command Center to the EFI throttle body. A 340 L/PH EFI pump is submerged in the fuel in the Command Center sump tank. The Center also has a regulator and fuel pressure gauges. When using the 30001/30002 Go EFI kits, the Com-mand Center is suitable for engines made from 200 HP stantly made to maintain the air/fuel targets.
Trigger Tach Signal: The FiTech EFI requires an rpm/trig-ger reference to
operate. This is obtained by a connection to the negative post on a 12V coil.
On HEI distributors, this connection is made to the “Tach” terminal that is
indicated on the HEI distributor cap. 
to 600 HP. Either fuel delivery system can be used with
these EFI systems. When using the 8-injector 30012 Go EFI System and the Fuel
Command Center, the system is suitable for engines making up to 800 HP. When
combining the 30012 Go EFI System with the 40005 Inline Pump, it is suitable
for engines up to 600 HP.
Note: If you have elected to use the Fuel Command Center and your vehicle
currently has a high-pressure fuel injection pump, it must be replaced with a
low-pressure carbureted style pump. Note that vehicles equipped with factory
high-pressure EFI pumps are not compatible with the Fuel Command Center. If
you choose to use some other fuel delivery system other than FiTech, it is
important to make sure that you confirm its compatibility with the FiTech EFI
system. Contact the FiTech technical staff to check compatibility. Failure to
do so can void your warranty.
Note the following special instructions:
- We recommend using the Fuel Command Center for all installations. A submerged pump is quieter and lasts longer.
- If using the Frame Mount Inline Fuel Pump, it should be mounted as close to the fuel tank as possible and also as low as possible. It should be within two to three feet of the tank. This type of pump is designed to pump, not draw, and works best when gravity-fed.
- Only use hard fuel lines when using proper EFI-rated flared fittings. Make sure that you remove ALL low-pressure flex joints on factory fuel lines and replace them with an EFI-rated fuel hose and use proper flared connections and clamps. Be careful not to mix 45° and 37°AN fittings, they look similar but will not work together. 45° fittings usually come from a hardware store or auto parts store while 37°AN fittings are the ones supplied by Fitech and most speed shops. Remember that your system will be running at 58 PSI so consult a professional if you are not certain about this portion of your installation. Fitech does not recommend aluminum fuel lines EVER! Or you can use the supplied EFI high-pressure fuel hose that is supplied in your Fuel Delivery Kit.
- Use the supplied push lock style hose ends only with the supplied hose and vice versa. Interchanging hose ends and hose with other brands could cause leaks.
VERY IMPORTANT NOTE: Your fuel tank must have a vent to prevent pressure from building up inside the tank.
Note: Before starting any installation, disconnect the ground connection on the battery. Be very careful when disconnecting any fuel lines to let the fuel drain into a re-
Oxygen Sensor Installation
The supplied O2 Sensor can be installed in either exhaust bank. The Sensor cable connects to one of the cables coming out of the ECU on the throttle body.
- A. The ideal location for the Sensor is 2-4 inches after the exhaust collector. It must always be at least 18 inches from the exhaust tip. Where short or open headers are utilized, install the sensor in the primary tube of the rear receptacle or a dry cloth. Do not allow raw fuel to collect on the engine as this is a fire hazard. Please observe extreme caution when working with the fuel system. cylinder. Must be at least 8 inches from the exhaust port. It will not work on “zoomie” style headers.
- B. The sensor should be at least 10° above horizontal (see figure #3) to allow condensation to run off. If this is not adhered to, the sensor is susceptible to water damage.
- C. Never position the sensor on the outside of a bend in the tubing.
- D. The sensor must always be mounted ahead of any catalytic converter if so equipped.
- E. Drill a 7/8″ diameter hole in the desired location.
- F. The supplied bung kit can either be welded in place or clamped onto the pipe. The clamp-on style works well and will not leak. If welded, make sure the bung is welded completely all the way around and does not leak.
- G. Install the sensor into the bung. WARNING: Do not start the engine without the sensor cable connected to the throttle body and the EFI system is fully operational or damage will occur to the sensor.
AIR LEAKS: It is important that no air leaks exist anywhere in the exhaust system between the sensor and the engine. Any exhaust leaks will cause the unit to receive false readings. This O2 Sensor will lead to poor engine performance, including misfires, and the inability to properly auto-tune the EFI. Continued running of the system with an exhaust leak can create detonation and possibly severe engine damage. Incorrect installation of the sensor, exhaust leaks, and any resulting damage is not covered by the FiTech manufacturer’s warranty. Make sure your exhaust is leak-free. This is very important.
Throttle Body Installation
Installing the throttle body is no different than replacing the carburetor.
Disconnect the throttle linkage and the fuel line. Remove the existing
carburetor from the intake manifold. Clean the gasket surface of the manifold.
Vacuum Ports: Before installing the throttle body determine the engine’s need
for vacuum accessories. The FiTech throttle body has five vacuum ports
including ported and manifold. These ports cover accessories such as power
brakes. There are three 3/16″ male nipples and two 3/8″ male nipple. If you
need more vacuum connections than this, you can purchase vacuum tees and
vacuum hose at your local auto parts store. See Figures 4, and 5 for the
location and use of various vacuum nipples. Throttle Body Installation: Place
the supplied gasket onto the manifold and place the throttle body onto the
gasket. The throttle body linkage must be on the driver’s side of the engine.
Install the original nuts and washers onto the four carburetor studs. Tighten
to 16 lb. ft. of torque. The FiTech throttle body has four fuel ports. Three
inlet and one return. Any one of three can be the inlet. The outlet port is
marked with the word “Return.” On a returnless setup the outlet port is
plugged. Three plugs are provided in the kit for the unused ports. Two plugs
are installed in the throttle body with one loose one in the kit. All three
plugs will be used on returnless configurations and only two wil be used when
the system has a return line.
Coolant Temperature Sensor Installation
The Temperature Sensor should be threaded into one of the ports in the intake manifold or cylinder head. The sensor threads are 3/8-NPT. Some manifolds have 1/2-NPT ports and in this instance use a supplied pipe reducer. Connect the Yellow/Black wire lead from the throttle body to the sensor. Snap the connector into the sensor. Use Teflon tape or a quality pipe sealant on both the pipe reducer (if used) and on the temperature sensor.
Wiring the EFI System
The supplied Harness “A” (see Figure 7) plugs into mating Connector “B” from
the throttle body-mounted ECU. See Figure 8. The various wires will need to be
extended to make required connections. See the Wire Chart on page 6 which
lists each wire used in the system and what it connects to. It is strongly
suggested that any wire extensions are made with the same gauge and color wire
as is used in the supplied Harness. Make connections as a soldered joint
rather than as a crimped connection. Utilize a shrink-wrapped sleeve covering
all connections. 
The above photo shows all of the cables that are associated with the FiTech Go EFI System throttle body. The large cable at the bottom left connects to the supplied Harness “A” which contains the main six wires used in the system. The large coiled cable at top left connects to the supplied Oxygen Sensor cable.
Wiring Chart
The Chart below lists all of the wires in the FiTech Go EFI System. The wires are color-coded and the wires that are part of Harness “A” are all marked for where they go. There are six wires in Harness “A.” Four of them are required connections and two are optional. More detailed connection information (Figures 9 through 11) is provided on later pages of these instructions.
The Following Wires Are Used In All Systems (6-Pin Connector)
Req./Opt.| Wire Color| Description
Required| Red (Large)| Main power. Connect this wire directly to the positive
(+) terminal of the battery. This circuit needs to be live even when the
switch is off so that the self-learning files are maintained. This is fused
with a 25 amp fuse.
Required| Yellow/Black| This wire connects to the Engine Coolant Temperature
Sensor
Required| Blue| This is the tach input wire which triggers the system. It
connects to the 12V Negative terminal of the coil. On HEI distributor it
connects to the “Tach” terminal on the distributor cap or connects to a tach
output on a CDI box.
Optional| Black| The black wire can provide the following function when
grounded:
1. RPM kicks up when A/C is activated.
Required| Orange (Large)| Fuel Pump circuit. This wire provides 12V to the
fuel pump and connects to the positive (+) terminal on the pump. No relay is
required.
Required| 02 Harness| This cable from ECU connects to the Wide Band Oxygen
Sensor harness.
Required| Wiring Harness A| This connects to Connector “B” from ECU. See
Figures 7 and 8 (Page 5).
Required| White| On/Off – Connect this wire to a switched 12V circuit. Must be
on during both “Key On” and “Cranking.” DO NOT connect to the coil terminal
when using an external CDI box such as an MSD 6A or any other CD ignition.
Optional| Yellow| Fan Circuit #1. This wire goes to the ground terminal of the
fan relay.
Wiring Diagrams
On the following three pages are various wiring diagrams that address the most
common ignition arrangements that will be found. Each diagram will show you
the specifics of how to wire your FiTech Go EFI System for that particular
ignition setup.
Selecting the correct wiring schematic: Review Figures 10 through 11 and
select the schematic that suits your particular application. Figure 10 shows
how to connect a ready-to-run distributor. Figure 11 is for an HEI
distributor.
Figure 11 is also for a system with an external CDI box.
Wiring Connections for FiTech Go EFI System with Ready-to-Run
Distributor
Wiring Connections for FiTech Go EFI System with HEI
Distributor
Wiring Connections for FiTech Go EFI System with External CDI
Box
Documents / Resources
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FiTech 30003 Go Street EFI
System
[pdf] Instruction Manual
30003 Go Street EFI System, 30003, Go Street EFI System, Street EFI System,
EFI System
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