GFB G-Force2 User Manual

GFB

Electronic boost controller

instruction manual

MENU

MENU

SCRAMBLE

SCRAMBLE

Go Fast Bits P/L
P.O. Box 1017
Riverwood NSW 2210
Australia

BOOST

BOOST

Ph: [phone]

Fax: [phone]

Email: [e-mail]

Web: www.gfb.com.au

contents

Intro

About the G-Force II

Installation

Wiring Diagram
Solenoid Valve Installation Diagram

Menu Navigation

Menu Structure
Boost Presets

Setting the Boost Pressure

Duty Cycle
Gain
Sensitivity

Controller Functions

Scramble Boost
Overboost
Peak Hold
Display Setting - Units of Pressure
Input Setup
Colour Settings

2

3
4

5
6

7
8
9

10
11
11
12
12
13

Additional Info

Tips
Troubleshooting
Tech
Warranty

14
15
16
16

about the g force ii

The GFB G-Force II boost controller is designed to bring on boost as fast and accurately as possible on a
turbocharged vehicle. It incorporates an advanced and unique boost control strategy that allows the user fine
control over the peak boost, rise rate, and closed-loop correction.

The G-Force II also features a new user interface, making menu navigation and setup as fast and simple as
possible.

Features at a glance:

?6 individually programmable boost preset memories, selectable on-the-fly

?Closed-loop correction - helps prevent boost variations
?New scramble boost strategy - increase or decrease boost for a certain amount of time at the push of a button
?Overboost protection - shuts down the solenoid and flashes a warning if boost goes too high
?Peak hold display
?Real-time boost/vacuum gauge display - in BAR, kPa, or PSI
?External input - can be used to activate scramble or select boost memories remotely
?Adjustable button colours - tie in with the car’s existing lighting

91.5mm

Installing the Head Unit

The G-Force II casing is a ½ DIN size, allowing to be
mounted into one half of a standard stereo slot.

Alternatively, with its thin profile (18.5mm), the G-Force II
can be mounted on a vertical face of the dashboard, or
stood up on its edge using the supplied double-sided
mounting tape.

2 - intro

MENU

53.5mm

SCRAMBLE

BOOST

wiring diagram

SCRAMBLE

MENU

BOOST

Remote trigger button (not

supplied). Use any switch, button

or sensor that grounds the blue

wire when activated

Optional Remote Trigger Circuit

Vehicle Interior

Yellow wire - not used, future features

(see notes below)

Vacuum hose joiner

1/8” I.D. vacuum hose

Loom

Blue wire - External input

(see notes below, and

pages 12 & 14 for details)

Red wire -

+12V switched power source

Black wire -

Vehicle ground (chassis)

Do NOT connect the blue or yellow wire to a 12V source as this could damage the unit.

Engine Bay

if necessary

To intake manifold -

use small Tee to tap into

an existing vacuum hose

3 - installation

The external input can be used as a remote trigger simply by connecting it to any kind of switch, button, or programmable ECU output

that grounds the blue wire to the vehicle earth when activated. For ideas on different ways to use the external input, see page 14. Once

connected, the purpose of the external input must be configured within the “INPUT” sub-menu within the menu (see page 12).

The yellow wire currently has no purpose, it is intended for use with future features.

If either the blue or yellow wire are not used, simply cut or bundle them and make sure they are insulated.

WARNING!

Solenoid

Boost Control

solenoid valve installation

Mount the solenoid valve in a position away from significant heat sources (such as the exhaust manifold and
turbine), and where it is protected from rain or splashed water. The unused outlet of the solenoid valve should be
positioned facing downwards to avoid ingress of dust, dirt and water.

DO NOT plug the un-used solenoid port, as this will prevent the controller from being able to adjust boost pressure.

Internal Wastegate

Screw the two supplied hose
tails into ports 2 and 3 of the
solenoid valve, and connect
the ports to the correct
locations as shown using the
supplied 3/16” hose.

Wastegate
actuator

Port 2

Port 3

Boost pressure

source

Screw the two supplied hose
tails into ports 1 and 2 of the
solenoid valve, and connect
the ports to the correct
locations as shown using the
supplied 3/16” hose.

Wastegate

Top port

Port 2

Turbo

External Wastegate

Boost pressure

source

Large Tee

Port 1

Turbo

Bottom port

4 - installation

menu structure

RUNNING MODE

(Normal controller operation)

MENU

Hold

To exit from the

menu at any point

To enter menu and advance

through the options

Duty Cycle

Display scrolls “dUtY”, followed
by “PEAK”. Details see page 7.

Gain

Display scrolls “gAIn”.
For more details, see page 8.

Sensitivity

Display scrolls “SEnS”.
For more details, see page 9.

Scramble Seconds

Display scrolls “SCr SEC”.
For more details, see page 10.

Overboost

Display scrolls “OVErbSt”.
For more details, see page 11.

Controls peak boost pressure.
Duty Cycle is adjustable from 0-100%, where 0 results
in the lowest boost pressure, and 100 is the highest.

Controls how fast the turbo spools up.
Gain is adjustable from 0-100, where 0 is the slowest
spool-up, and 100 is the fastest.

Controls how strongly the G-Force II resists changes in
boost pressure. Sensitivity is adjustable from 0-100,
where 0 results in no correction and, and 100 is the

Sets the number of seconds that the scramble boost
feature remains on when activated.
Adjustable from 0-100 seconds.

Turns off the solenoid in the case of over boost.
The Overboost setting is adjustable from 0-345kPa, 0-

3.45bar, or 0-50psi, depending on which display units
are currently in use.

Peak Hold

Display scrolls “PEAK”.
For more details, see page 11.

Display Units

Display scrolls “dISP”.
For more details, see page 12.

Input Setup

Display scrolls “INPUt”.
For more details, see page 12.

Button Colours

Display shows “COL.”.
For more details, see page 13.

Turns the Peak Hold display function on and off.
When set to “ON”, the display shows the peak boost
value for 3 seconds after the manifold drops to vacuum.

Changes the display pressure units.
Can be set to kPa (default setting), BAR, or PSI.

Changes the function of the external input wire.
“OFF” turns off the remote input, “PrE” jumps to the
next boost preset, and “SCr” activates scramble feature.

Allows changes to the button colours.
The display does not change, but pressing “up” will alter
the “scramble/preset active” button colour, and pressing
down” will alter the normal “background” button colour.

5 - Menu navigation