Nos 25973NOS User manual

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MINI 2-STAGE PROGRESSIVE NITROUS
CONTROLLER
25973NOS, 25974NOS, and Upgrade Kits
INSTALLATION AND OPERATION INSTRUCTIONS
THANK YOU for purchasing the NOS Mini 2-Stage Progressive Controller! Your system is composed of the highest
quality components available. It should provide many miles of trouble-free performance when used correctly. If you have
any questions regarding the performance of your system, call NOS Technical Service at 1-866-464-6553.
NOTICE: Installation of Nitrous Oxide Systems Inc. products signifies that you have read this document and have
agreed to the terms stated within.
e
product as it is received by the purchaser to determine the compatibility of the product with the vehicle or the device the
purchaser intends to install the product on.
Nitrous Oxide Systems Inc. assumes no responsibility for damages occurring from accident, misuse, abuse, improper
installation, improper operation, lack of reasonable care, or all previously stated reasons resulting from incompatibility with
Nitrous Oxide Systems Inc. assumes no responsibility or liability for damages incurred by the use of products
manufactured or sold by Nitrous Oxide Systems Inc. on vehicles used for competition or racing.
Nitrous Oxide Systems Inc. neither recommends nor condones the use of products manufactured or sold by Nitrous Oxide
Systems Inc. on vehicles, which may be driven on public roads or highways, and assumes no responsibility for damages
incurred by such use.
NOS nitrous oxide is legal for use in most states when used in accordance with state and local traffic laws. NOS does not
recommend or condone the use of its products in illegal racing activities.
NOS has not pursued California Air Research Board (CARB) exemptions for these kits, hence, they are not legal for use
on pollution- controlled vehicles in California. A correctly installed NOS nitrous system should not alter the emission
control performance of your vehicle under standard EPA test cycle conditions.

HAZARDS DEFINED
This manual presents step-by-step instructions that describe the process of installing your NOS Mini 2-Stage Progressive
Controller. These procedures provide a framework for installation and operation of this kit. Within the instructions, you are
advised of potential hazards, pitfalls, and problems to avoid. The following examples explain the various hazard levels:
WARNING! Failure to comply with instructions may result in injury or death. CAUTION! Failure to comply with
instructions may result in damage to equipment.
NOTE: This information is important, needs to be emphasized, and is set apart from the rest of the text.
HINT: These special instructions provide a handy work tip.
NITROUS OXIDE INJECTION SYSTEM SAFETY TIPS
WARNINGS
IT IS NOT LEGAL TO ENGAGE NITROUS OXIDE INJECTION SYSTEMS ON PUBLIC ROADS OR HIGHWAYS.
NITROUS OXIDE INJECTION SYSTEMS ARE ONLY TO BE ENGAGED DURING SANCTIONED COMPETITION OR
RACING EVENTS.
Do not attempt to start the engine if the nitrous has been injected while the engine was not running. Disable the
lutions
before attempting to start. Failure to do so can result in extreme engine damage.
Never permit oil, grease, or any other readily combustible substances to come in contact with bottles, valves,
solenoids, hoses, and fittings. Oil and certain gases (such as oxygen and nitrous oxide) may combine to produce
a highly flammable condition.
Never interchange nitrous and fuel solenoids. Failure to follow these simple instructions can result in extreme
engine damage and/or personal injury.
Never drop or violently strike the bottle. Doing so may result in an
explosive bottle failure. Never change pressure settings of safety relief
valve on the nitrous bottle valve. Increasing the safety relief valve
pressure settings may create an explosive bottle hazard.
Please note that the NOS bottle label has changed to a two-part
assembly. The first label is already located on the bottle. Upon filling
your bottle with nitrous oxide, apply the (second) material information
label in the area indicated in the picture to the right.
NOTE: The material information decal is located in the same plastic bag
as the bottle.
WARNING! Once the nitrous bottle has been filled, it must be shipped
according to the applicable transportation and shipping regulations!
Do not deface or remove any markings, which are used for content identification. Nitrous bottle valves should
always be closed when the system is not being used.
Notify the supplier of any condition that may have permitted any foreign matter to enter the valve or bottle. Keep
the valves closed on all empty bottles to prevent accidental contamination.
fittings.
It is important that all threads on the valves and solenoids are properly mated. Never force connections that do
not fit properly.

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Table of Contents
Chapter 1 Product Overview .............................................................................................................................. 4
Chapter 2 Controller Installation & Wiring .......................................................................................................... 4
Chapter 3 Hand-Held Setup............................................................................................................................7
3.1 Home Screen ........................................................................................................................................... 7
3.2 Main Menu ............................................................................................................................................... 8
3.3 Nitrous Configuration ............................................................................................................................... 8
3.3.1 System Setup RPM Signal ...............................................................................................................8
3.3.2 System Setup TPS Autoset .............................................................................................................. 9
3.3.3 System Setup - Stage 1 & Stage 2 ...................................................................................................... 9
3.3.3.1 Stage 1 & Stage 2 - Setup ............................................................................................................... 9
3.3.3.2 Stage 1 & Stage 2 - Graph ............................................................................................................. 11
3.3.3.3 Stage 1 & Stage 2 - Configuration .................................................................................................. 11
3.4 Save/Load Tune ..................................................................................................................................... 12
3.5 Controller Setting ................................................................................................................................... 13
3.5.1 Touch Calibrate................................................................................................................................. 13
3.5.2 Controller Info/Firmware Upgrade ..................................................................................................... 14
3.5.3 Dash Setup ....................................................................................................................................... 14
Chapter 4 Hand-Held Firmware Update ........................................................................................................ 14
Chapter 5 System Operation & Testing ........................................................................................................ 15
5.1 Initial Testing & Verification .................................................................................................................... 15

Chapter 1 Product Overview
The NOS Mini 2-Stage Progressive Nitrous Controller is a fully featured progressive nitrous controller offering control of up to 2
individual stages and can be fully programmed via a hand-held LCD touch screen display. An SD (Secure Digital) memory card reader
is built-in on the hand-held controller to store tunes and is used for updates.
The NOS Mini 2-Stage Progressive Nitrous Controller can control progressive solenoid operation based on time, RPM, and/or TPS
input and can shut nitrous off at a programmed RPM ceiling. The programmable nitrous and fuel ramps can be programmed in any
curve shape or with the built-in ramp builder app.
The NOS Mini 2-Stage Progressive Nitrous Controller is designed and constructed in a manner to endure the typical harsh conditions
found in a racing environment. The controller can be mounted in the engine or passenger compartment. It is advisable to keep the
controller away from direct heat and severe vibration. Although not required, it is beneficial to use rubber isolators when mounting the
controller on applications that may see severe tire shake, etc.
A progressive, 2 stage nitrous system works by pulsing each set of solenoids for a user defined start time, cycle time, and duration.
This NOS Mini 2-Stage Progressive Nitrous Controller allows the user to drive the solenoids at different times, to tailor power delivery to
the engine as needed. The user can choose to utilize a window switch (RPM), a throttle position sensor (TPS), and/or a microswitch to
trigger the controller.
When the user sets up the controller or chooses the trigger mechanism, they can utilize the time delay option to trigger the first or
second stage of nitrous when it is most needed. This could be after the vehicle has launched (low traction, first stage), and then has
traction later on in the run (second stage).
Chapter 2 Controller Installation & Wiring
The NOS Mini 2-Stage Progressive Nitrous Controller accepts most tach signals, including low-voltage and irregular signals, such as
those found on many V-10s. Each channel will drive a fuel or nitrous solenoid progressively. The Throttle Position Activation Switch
(TPAS) accepts all analog throttle -open-throttle (WOT) switch. Both
channels have their own programmable parameters, as well as their own control output for triggering extra functions, such as ignition
Solenoid pulse frequency
is also adjustable to allow the use of different types of solenoids.

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GROUNDS:
Proper grounding is essential to a microprocessor controlled progressive nitrous controller. The controller has two ground wires that
need to be connected. Proper practice is as follows:
Ground #1 12 AWG black ground cable Install this to a good chassis ground that is grounded securely to the battery as well.
Ground #2 18 AWG black ground wire vehicle.
IMPORTANT!
consist of any ignition product as well as the 12 AWG black ground cable from the controller nds are
to a ground ounds to a
separate point/stud.
1. Connect the main 8-pin wiring harness to the controller.
2. Connect the WHITE wire to a +12V fused switched power source. You should install this to a circuit that has a 5A fuse and can
supply two amps to the unit. If this is not available, you should install a fuse holder.
3. Connect the GREEN wire to the RPM pickup point. You will define the proper RPM conversion in the software setup. This wire
boxes and some distributors (12V square wave). For coil-on-plug
equipped vehicles, it can be connected to one of the individual coil signal wires, which is typically a ground trigger. For specific
applications, consult a factory service manual.
4. The WHITE/BLUE Input 1 Control used to activate Stage 1. Connect to either a
switched 12V or ground microswitch output, or it can be connected to the signal output wire on a TPS with either a rising or falling
voltage. The signal type is selected in the software configuration. If you are not sure which wire this is, consult a factory service
manual.
5. The WHITE/RED Input 2 Control re. This is the trigger wire used to activate Stage 2. Connect to either a switched
12v or ground microswitch output, or it can be connected to the signal output wire on a TPS with either a rising or falling voltage.
The signal type is selected in the software configuration. If you are not sure which wire this is, consult a factory service manual.
NOTE: CH. 1 & CH. 2 trigger input wires can be used together or separate on the TPS sensor.
6. The YELLOW & ORANGE re programmable in the software for various
purposes, such as activating a timing retard, etc. These have different programmable output that can be set within the Controllers
settings. The YELLOW = Stage 1 Output and the ORANGE = Stage 2 Output. If these wires will not be used, heat shrink the
end and secure it tightly out of the way. NOTE: These are low current ground outputs. If using to trigger a high current
device (over 1 Amp), use them to trigger a relay.
7. The 12 AWG BLUE & RED wires are the solenoid ground outputs. The system works by providing a ground to the solenoids.
These wires are to be connected directly to the solenoids. Power must be supplied separately to the solenoids by utilizing an
appropriate relay. BLUE = Stage 1 Solenoid Ground Output, RED = Stage 2 Solenoid Ground Output. NOTE: These
channels have a max current rating of 40 AMPS.
8. The 3-pin connector on the main controller is for an optional nitrous pressure transducer input P/N 15661NOS, this kit includes the
pressure sensor transducer and cable and is sold separately. Install the sensor at the bottle and plug into the harness.
9. The 4-pin connector is for the hand-held display.
Connecting the NOS Mini 2-Stage Progressive Nitrous Controller to the Touchscreen LCD
Connect the NOS Hand-held to the main harness. This is a simple plug and play connection. If you are going to permanently leave the
hand-held in the vehicle, you will need to find a factory grommet in your firewall to pass the Display CAN bus connect through and
secure the excess wire away from hazards. If no factory grommets can be utilized we recommend installing one purchased online or
from your local auto parts store.

Note: If the touch screen LCD display needs to be unhooked from the NOS Mini 2-Stage Progressive Nitrous Controller,
depress the lock tab on the male side of the connector as shown in the following images.
Unused Wires
As you finish the installation of your NOS Mini 2-Stage Progressive Nitrous Controller you may have unused wires. These wires need to
be properly taken care of before installation is considered complete. The preferred option is to remove them from the connector and
insert a weather proof plug in their place. The second option is to shorten the wire and properly seal the end of it to prevent shorting
out.
Option 1: Pin Removal (Recommended Method)
Required tools:
Small flat head screw driver
Pin removal tool # 567-101
Procedure:
1. Use a small screwdriver or other prying tool to gently remove the protective cover from the back of the connector. NOTE: Be
careful not to over extend the tabs on the cover or it will not securely fasten during reinstallation.
2. Gently insert # 567-101 removal tool into the small slot above the pin on front of the connector. It should not require much
fo
3. With the removal tool still inserted fully in the cavity gently pull on the wire to remove it.
4. If you will not be putting a sealed wire back in the cavity then you should now install one of the cavity plugs supplied with
tool 567-101.
5. Re-install protective cover on back of connector.

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Option 2: Trim and Wrap Wire
Required tools:
Wire cutters
Adhesive heat shrink tubing
Heat source (heat gun or other)
Procedure:
1. Disconnect the battery terminals.
2. Cut the end of the wire so there are no bare copper wires showing. NOTE: Make sure you leave enough length on the
wire that you will have room to crimp or solder it at a later date should the need arise.
3. Place a
4. With the heat shrink tubing placed so it is covering the wire with two thirds of its length, apply heat to shrink the tubing.
5. Give the heat shrink a small pull to verify that it is solidly attached.
Chapter 3 Hand-Held Setup
3.1 Home Screen
The main screen of the NOS Mini 2-Stage Progressive Nitrous Controller displays the engine RPM, Bottle Pressure (if equipped), Stage
1 & Stage 2 activation RPM via colored bars (Blue = Stage 1, Yellow = Stage 2), and Stage 1 & Stage 2 ON/OFF display (ON is only
displayed when the solenoids are actively being trigged).
The Gear to the top right corner allows you to enter the main menu to begin the system setup process.
bottle
pressure display as follows:
White = Bottle Pressure Very Low 0-800 psi
Yellow = Bottle Pressure Low 801-900 psi
Green = Bottle Pressure Optimal 901-1000 psi
Red = Bottle Pressure too High 1001+ psi

3.2 Main Menu
By selecting the gear icon at the top right corner, you will be directed to the main menu screen. Here you can select from the menu
items. Selecting the will take you back to the home screen.
3.3 Nitrous Configuration
In the Nitrous Configuration menu you will be presented with a choice of three menus. System Setup, Stage 1, & Stage 2. NOTE: The
controller will come pre-programmed with default values. These are only placeholders and will need to be configured.
3.3.1 System Setup RPM Signal
System setup allows you to select the type of RPM signal and set up the TPS via the TPS Autoset app. The NOS Mini 2-
Stage Progressive Nitrous Controller supports the following RPM Signals:
Individual Coil per Cylinder (Coil on Plug)
Coil packs that fire in pairs (Waste Spark /Dual Outlet Coil Pack Systems) Note: Use this setting to expand the
RPM range higher than 9900. For example, on a 4 cylinder motorcycle, this will allow for a higher maximum RPM
window. In this mode, the control can be set at 3000 and 6000 which will activate at 6000 and 12000. (This can
only be done if the application is NOT a waste-fire ignition system).
2-12 cylinder engines, when the tach wire is connected to the tach from the engine electronic controller or
distributor (e.g. a cd ignition system or a conventional coil/distributor setup) (This would be the 12V square
wave tach output on a MSD box or a GM HEI).
NOTE: n inductive
style ignition.
NOTE: Refer to the factory service manual to identify which style ignition system the vehicle has for proper wire
connection.
Enters System Setup, Stage 1 Setup, & Stage 2
Setup Menus
Go back to the Home Screen
Save & Upload Tunes
Update Co
ntroller, adjust Home Screen RPM
display limits, touch screen calibration, &
enable/disable bottle pressure display

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3.3.2 System Setup TPS Autoset
Click on the TPS
Autoset box. Notice the TPS voltage display at the top, this is the voltage when the throttle body is at its resting state. Click on
the start button. Momentarily press the accelerator pedal completely to the floor and release, to reach 100% throttle the unit
only needs to see WOT (wide open throttle) briefly to configure the WOT voltage.
NOTE: Depending on which wire you chose or the type of TPS signal you have, the voltage may rise from a low number
(0.5V) to a high number (4.6V) or vice versa. The TPS Autoset App will automatically recognize this and adjust the activation
threshold.
+
3.3.3 System Setup - Stage 1 & Stage 2
The Stage 1 Menu allows you to configure the 1st stage of the nitrous system. Within the Stage 1 Menu, you will find the
Setup, Graph, & the Configuration Menus. NOTE: Stage 2 menus are identical to stage 1. Stage 2 can be used to
control a second nitrous solenoid or a fuel solenoid.
3.3.3.1 Stage 1 & Stage 2 - Setup
The setup menu contains the settings which allow you to enable or disable the stage, adjust activation and deactivation RPM,
and enter the Ramp Builder App.
Enable/Disable Stage When a stage is disabled, the stage will no longer activate the bar displayed on the RPM
gauge will be removed and the menu selections for the stage will also be removed until the stage is reactivated.
Activation/Deactivation RPM Allows you to enter the activation and deactivation RPMs. These can be adjusted via
the arrow buttons or if you press on the number itself, you can manually enter any desired number from 0-15,000 RPM.
Ramp Builder The Ramp Builder App allows you to easily create a linear curve which the controller will use to progress
the entry of nitrous/fuel to the engine. You must enter Start %, End %, Delay Time, Ramp Time, & Stage Duration for the
controller to create the curve.
Press the
accelerator
pedal
completely to
the floor and
release, to
reach 100%
throttle
Configure Stage Activation
Parameters & Enter Ramp
Builder App.
Display/Edit Stage Graph
Display/Edit Stage
Output, TPAS Mode,
Ramp/Pause Mode, &
PWM Frequency.

.
3.3.3.1.1 Setup - Ramp Builder
The Ramp Builder App, allows you to easily create a linear curve which the NOS Mini 2-Stage Progressive Nitrous
Controller will use to progressively introduce the nitrous/fuel into the engine. The controller will need the following
information to properly generate the curve.
Start % Percent of initial solenoid activation. This controls the amount of nitrous or fuel which is introduced
into the engine at the beginning of the stage. Note: The Start % can be more or less then the End %
End % Percent of solenoid activation at the end of the ramp. This controls the amount of nitrous or fuel which
is introduced into the engine at the end of the stage. Note: The End % can be more or less then the Start %
Delay Time Time, in seconds that the controller delays nitrous activation after all conditions are met. This can
be used to tailor power delivery to activate when the power can be used most effectively (i.e., delay the nitrous
until after launching, etc.)
Ramp Time Time, in seconds that the ramp builds to the End %. The more time added here, the
stage activation will become. 0 seconds here will fully activate the stage all at once settings such as start %
and end % will become invalid and not used.
Stage Duration Time, in seconds that the stage will be active for after the activation conditions are met. This
can be adjusted from 0 to 300 seconds.
Enable/Disable Stage
Stage Activation RPM
Stage Deactivation RPM
Enter Ramp Builder App.
For Manual Entry
Press Number
Adjust RPM via ar
row
buttons or manually
enter RPM from 0-
15000 RPM
En
ter number and press
SAVE when complete. CLR
will clear the existing
number, Back will erase one
digit at a time, and Canc. will
back out from the screen with
no changes.
% of Initial Stage Activation
% of Stage Activation at the
End of the Ramp
Stage Deactivation Time
Ramp Build Time
Length of Stage Duration
Press When Complete to
Configure Ramp