A’PEX SUPER AFC ? User manual

1
A’PEX Chasing Our Dreams - A complete line of customized car and
automotive parts developed with state of the art technology and new
ideas. Our company is A'PEX which means the highest in quality.
SUPER
AIRFLOW CONVERTER
SUPER
AIRFLOW CONVERTER
A’PEX SUPER AIRFLOW CONVERTER
INSTRUCTION MANUAL
Thank you for purchasing the A’PEX
Super Airflow Converter. Please read
through this Instruction Manual to
operate this product correctly and keep
it near the product so that you may
refer to it whenever necessary.
If you transfer the product to another
customer, be sure to attach this
Instruction Manual and the warranty to
the product.
SUPER AFCⅡ
401-A911 / 401-A913
Car models mentioned in the wiring diagram by model
Airflow / pressure sensor signal adjustment
Product name
Product code
Applicable car models
Application
A’PEX CO., LTD

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Contents
Chapter 1 Introduction
Safety Precautions 4
Features of this Product  6
Names and Functions of Parts  8
Parts list ...............................................................................................................8
Names of parts ....................................................................................................9
Meanings of operation symbols appearing in this document .................................9
Chapter 2 Initial Setup
Procedure before Using This Product  12
Perform initial setup 13
Setting the sensor type and sensor number 【Sensor Type】...............................13
Setting the number of cylinders 【Car Select】......................................................13
Checking the throttle sensor voltage【Sensor chk】...............................................13
Setting the throttle sensor type 【Car Select】.......................................................13
Learning the throttle opening ..............................................................................13
Correcting the knocking signal 【Knk Set】............................................................13
Chapter 3 Outline of Operating Method
Outline of Functions and Operating Method 16
Functions and Operations in monitor mode 18
Functions and Operations in the setting mode 19
Functions and Operations in the etc, mod19
Chapter 4 Monitor Mode 【Monitor Menu】
Channel Select 【1Channel】〜【4Channel】22
A plot display is made by using the RPM for the axis. 【Rev.-[Y]】27
Chapter 5 Setting Mode 【Setting Menu】
Air correction factor setting (Throttle opening, large) 【Hi-Thrtl】30
Air correction factor setting (Throttle opening, small) 【Lo-Thrtl】30
Throttle opening setting 【TH-Point】32
Air correction engine RPM setting 【Ne-Point】34
Deceleration air upper limit setting 【Dec.-Air】36
Knocking signal correction 【Knk Set】38
Data file 【Data File】40
Chapter 6 Etceteras (etc.) Mode 【etc．Menu】
Sensor type and sensor number setting 【Sensor Type】44
Number-of-cylinders and throttle sensor type setting 【Car Select】50
Sensor check 【Sensor chk】52
Display scale setting 【Disp Scale】53
Warning setting 【Waning Set】54
Password setting and change 【Pass Lock】56
VFD brightness adjustment 【VFD Bright】58
Program version check 【Program Ver.】59
All data initialization 【Initialize】60
Troubleshooting 62

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Chapter 1 Introduction
Safety Precautions4
Features of this Product 6
Names and Functions of Parts8
Parts list...........................................................8
Names of parts................................................9
Meanings of operation symbols appearing in this
document ........................................................9

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●Do not use this product for any application other than applicable
vehicles or applicable goods .
We shall disclaim the responsibility for operations in an application other than the
applicable vehicles or applicable goods. It will result in an unexpected accident.
●If this product gives out any abnormal noise or offensive smell, stop
operating the product immediately.
Using the product in this status will result in an electric shock, fire, or damage of
electric parts. Consult the distributor or your nearest business office for information.
●Do not use this product and its accessories in any way other than
specified by A’PEX.
In this case, we shall disclaim all responsibility for any damage or loss to the customer
and third persons.
●Do not turn on and/or off immediately during and after operating the key
Set/recorded data may be lost.
Safety Precautions
Please read “Safety Precau-
tions” carefully to operate
the product with safety.
Keep the Instruction Manual
in hand and refer to it
whenever needed.
The Instruction Manual
describes the items that you
must observe to operate the
product without giving any
injury to you, other people
and damage to property.
The meanings of pictorial
indications (signal words)
are as shown on right.
Please understand their
contents correctly before
starting to read the text.
■Explanation of indications
This indicates the existence of
potential hazard that will result
in death or serious injury of the
operator or a third person if the
product is wrongly operated in
disregard of this indication.
This indicates the existence of
potential hazard that will result in
slight injury or medium damage to
the operator or a third person, and
that will result in only physical
damage if the product is wrongly
operated in disregard of this
indication.
This indicates the contents of a
failure in obtaining the full
performance of the product, or a
product failure or faulty function
item if the product is wrongly
operated in disregard of this
indication.
MeaningIndication
WARNING
！
CAUTION
！
REQUEST
WARNING
！

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WARNING
！
●Regarding the installation of this product, be sure that it is installed
by an experienced professional
Installing the product requires technical knowledge and skill. Be sure that the installer
installs the unit securely.
●Do not tamper, disassemble, or modify this product
This may cause an accident, fire, electric shock, or electric parts will be damaged or
burnt out.
●Do not drop this product or expose it to strong shock
This may cause a malfunction, thereby giving damage to the product and the vehicle.
●Do not operate this product under direct sunlight or in high-temperature
vehicle interiors that are not air-conditioned in the summer season
A malfunction will be caused, thereby giving damage to the product and the vehicle.
●Do not install the product in a high-temperature place or in a place
exposed to direct water
It will cause an electric shock or fire, or electric parts will be damaged. The malfunction
may damage the vehicle.
CAUTION
！
●The driver must not operate this product during driving
This may interfere with driving operations, resulting in an accident.
●Mount this product securely. Do not install it in an unstable place
that may interfere with driving
This may interfere with driving, resulting in an accident.
●When installing the product, remove the negative terminal of the
battery beforehand
A fire may be caused by short circuit or electric parts may be damaged or burnt out.
●When removing a coupler, be sure to hold the coupler without pulling
the harness
If the harness is pulled, a fire may be caused by short circuit or electric parts may be
damaged or burnt out.
●Be sure to perform wiring in accordance with the contents described
in the Instruction Manual
Incorrect wiring will result in a fire or other accidents.
●If any adjustment must be made during actual driving, take special
care not to interfere with other traffic, observing the traffic laws and
regulations
It will interfere with driving, resulting in an accident.

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●This product cannot be used for any application other than the
vehicles mentioned in the separate Vehicle Specific Application
Charts.
●Note that noise interference may be caused to radio, TV, etc.
depending on the mounting location of this product and the routing
of the signal harness.
●This product generates heat in the power ON status. This is not
abnormal.
CAUTION
！
■Unconventional large screen monitor using a high-brightness VFD
The futuristic front face of this unit uses the large screen, high-brightness and easy to
read VFD (Vacuum Fluorescent Display)
Use of the dot-matrix large screen monitor allows the displaying several types of
information simultaneously. Display variations are not limited to only numeric value
display, but also graph display, analog display, and other various displays are shown.
This allows the driver to recognize important information in an instant.
■Utilizes a thin case and single button
A thin case of 52 mm(L) x 126 mm(W) x 18 mm (D) (Minimum) has been achieved by
optimization of the circuit board and case design. The product can be easily installed
on the steering column or dash board. Since there is no separate unit besides the
main unit, it is not necessary to secure a place for installing any separate unit. Using a
4-direction switch with a center pushbutton and a rotary switch gets rid of the button-
to-button distance and permits quick operations, thereby providing efficient operation
of the unit.
■Battery-less memory that can keep initial setup data in the memory
even if the vehicle battery is disconnected
With the use of the EEPROM, the initial setup data is not lost unless initialization is
performed, even if the power supply is turned off or the vehicle battery is
disconnected. The setting data, such as peak value and correction value, is never
lost. Accordingly, if the vehicle battery is disconnected for service inspection, initial
setup and settings do not need to be performed again and the data history is not lost.
Features of this product
The SUPER AFC II is a fuel adjustment controller in which the airflow sensor signal or the
pressure sensor signal can be modified in a 12 point RPM range by 1% increments to
increase/decrease fuel in a range of +50% to –50%. The RPM to be corrected can be
optionally set in 200 RPM increments, and corrections can be made according to throttle
opening amounts. In a turbo equipped vehicle with a hot wire type airflow meter, this
controller provides a preventive function for engine stall due to blow-back during throttle
return. The controller, which includes a knocking meter, allows the monitoring of knock
levels check keeping the engine under its optimum condition at all times. (Vehicle must
have a factory knock sensor)

7
■Storing two patterns of setting data in the memory
Two patterns of setting data including air correction factor, throttle opening, air
correction engine revolution speed, deceleration air upper limit, etc, can be stored
in the memory. There are two files that can be stored in the memory. The setting data
can be selected in an instant according to each driving stage such as circuit driving,
town driving, and winding driving. When driving on the same stage, two patterns of
setting data can be compared. These patterns of setting data can be used for various
purpose.
■Setting disable function by password
If the setting data or initial set points are changed by disoperation or mischief, the car
condition may be deteriorated, or in the worst case, the engine may be damaged. In
the SAFC II, when the user sets a password optionally, changing the setting data or
initial setup items is disabled.
■Warning function to make hazard known
It is possible to set warning values for the airflow using ratio, suction tube pressure,
Karman swirl sensor frequency, knocking, and engine revolution speed.
When each item is set, the car condition can be precisely judged. The setting for the
engine speed can also be used as a shift timing point.
◆Knocking
Spontaneous ignition is caused by the heat and pressure of mixed air in the burning
portion of non-combustion gas which is far from the plug and the heat of combustion
chamber wall, so that the gas in the whole combustion chamber generates high-
pressure waves momentarily. In this phenomenon, strong metallic noise is output from
the engine unlike car knocking by which the car body becomes jerky, with the result
that the valve is damaged and the piston is seized, thereby giving fatal damage to the
engine.
As countermeasures, fuel adjustment, ignition timing adjustment, compression ratio
adjustment, improvement of intake-side squish area, use of mirror type combustion
room wall, and profile improvement of the exhaust-side cam shaft can be mentioned.
●During driving, the driver must not operate this product in any case.
It will interfere with driving operations or result in an accident.
●On general public roads, observe the road and traffic law to drive
the car carefully.
WARNING
！

8
Names and Functions of Parts
■Parts list
Before installing this product, be sure to check the parts list to confirm that there are not
any foreign or missing parts. If any difference is found between the actual parts and the
parts list, please contact the dealer of purchase.
1.Main unit 2.Instruction manual(Operation part) 3.Wiring diagram by model 4.Operation transition diagram
5.Warranty 6.Signal harness 7.Splitting harness 8.Splice
9.Plug 10.Male sleeve 11.Plug receptacle 12.Female sleeve
1unit 1volume (this document) 1volume 1sheet
1sheet 1sheet 1piece 6pieces
4pieces 4pieces 4pieces 4pieces
SUPER
AIRFLOW CONVERT ER
1pieces
13.Mounting stay

9
Example)
●Popup menu
When you press the center pushbutton, the popup menu shown at
right appears. The selected portion will appear as a reverse
display. Make a selection by the upper/lower/left/right part of the
center switch and decide the selection by pushing the center push
button.
The meanings of alphabetic characters are as follows;
Ｔｐ[TOP]......... Go back to the main menu
Ｎｘ[NEXT]........ Go to the next
Ｐｒ[PREVIOUS]... Go back to the previous
Ｃｎ[CANCEL]..... Cancel the popup menu
Ｎｘ Press the center pushbutton and select [Nx]
in the popup menu.
4-direction switch with
a center pushbutton
Rotary switch
SUPER
AIRFLOW CONVERTER
Optical sensor
(CDS sensor)
VFD display section
■Names of parts
■Meanings of operation symbols appearing in this document
※Press the right part of the
center switch
※Press the upper part of the center
switch
※Press the left part of the center
switch
※Press the lower part of the
center switch
※Press the center pushbutton
※Turn the rotary switch counterclockwise or clockwise
When the rotary switch is turned clockwise, the numeric value shifts in the
positive direction or the cursor moves upward.
When the rotary switch is turned counterclockwise, the numeric value shifts in
the negative direction and the cursor moves downward. The upper/lower part
of the center switch has the same function as the rotary switch.

10

11
第２章
Chapter 2
Procedure before Using This Product _____ 12
Perform initial setup ___________________ 13
Setting the sensor type and sensor number 13
Setting the number of cylinders ...................13
Checking the throttle sensor voltage ............13
Setting the throttle sensor type ....................13
Learning the throttle opening .......................13
Correcting the knocking signal .....................13
Initial Setup

12
Procedure before Using This Product
Install this product
The details of the installation procedure are described in the separate “Vehicle Specific Wiring
Diagram.” Install the product securely referring to the “Vehicle Specific Wiring Diagram” in a
separate document.
Turn on the ignition switch
Make sure that any abnormal noise or offensive smell is not produced from the SAFC II and the
Vehicle.
Turn the ignition switch off
The setting data is stored in the memory.
Start the engine
Perform initial setup
Perform initial setup securely by referring to page 13.
●If no display appears, or any abnormal noise or offensive smell is
produced from this product despite proper installation, discontinue
operation of the product immediately and contact the dealer of
purchase.
CAUTION
！

13
●Do not start the engine before starting the initial setup
If the engine is started without initial setup, the engine may be damaged.
WARNING
！
Perform initial setup
To operate this product, you must set several items during initial setup.
After making sure that the SAFC II is securely installed, turn on the ignition switch and
select the ETC. (etc. mode) in the main menu.
Table of initial setup items
１．Setting the sensor type and sensor number (P.44 [Sensor Type])
Select Sensor Type and set the sensor type and sensor number
For vehicles equipped with a hot wire sensor, set the sensor output calculation
method.
２．Setting the number of cylinders (P.50 [Car Select])
Select Sensor Type and set the number of cylinders.
You can select it in the range of 1 to 16 cylinders.
Rotary engine car: Number of rotors ×2
Toyota V8 engine car: 4
Nissan Fairlady Z (Z33) Skyline (CPV35): 1
Mazda Atenza (GG#S/P, GY#W): 2
※For a car without throttle sensor signal, start operations from 6.
３．Checking the throttle sensor voltage (P.52 [Sensor chk])
Select Sensor chk and check the throttle sensor voltage with the throttle fully closed
and once with the throttle fully open.
４．Setting the throttle sensor type (P.50 [Car Select])
Select Car Select. When the throttle sensor voltage is 0 V to 1 V fully closed in the
previous step, set the arrow to the upward direction. When the throttle voltage is 3 V
to 5 V, set the arrow to the downward direction. When the arrow is set to the ※※
mark, no correction is performed by throttle opening.
５．Self learning the throttle opening
Self learn the throttle opening. Hold the throttle fully closed for about 10 seconds.
After that, hold the throttle fully open for about 10 seconds.
６．Turn off the ignition switch
When the ignition switch is turned off, the set items are stored in the memory
※After this, the initial setup is completed for a car without any knocking signal. For,
a car with a knocking signal, perform setting 7.
７．Correcting the knocking signal (P.38 [Knk Set])
Start the engine and perform warming-up. After completion of warming-up, select
Setting (setting mode) in the SAFC II main menu and select the knocking signal
correction mode. Correct the knocking signal.
With this, the initial setup is completed.

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15
Chapter 3
Outline of Operating Method
Outline of Functions and Operating Method16
What to be performed in the monitor mode18
What to be performed in the setting mode19
What to be performed in the etc. mode 19

16
Outline of Functions
and Operating Method
Main menu
The SAFCⅡconsists
mainly of 3 menus;
Monitor mode
The data obtained from the sensor is
displayed The airflow usage
ratio, intake pres-
sure, Karman
sensor frequency,
throttle opening,
engine RPM, air
correction factor,
knocking level, and
battery voltage are
displayed.
Setting mode
This mode is used for the user to perform
settings The air correction
factor, throttle open
ing, air correction,
engine RPM, and
the upper limit for
deceleration air is
set. Knocking
signal correction
and data file are
also controlled.
etc. mode
This mode is used to perform various
settings including initial setup
The initial setup,
display scale
setting, and
warning settings
are set according
to the vehicle
specifications, and
the pass word
setting/change,
VFD brightness
adjustment, and
initialization are
Performed.

17
■[Channel 1 to Channel 4] display items
1. Afl........................Airflow (Hot wire/Flap) usage ratio
2. Prs.....................Intake pressure
3. Kar.......................Karman sensor frequency
4. Thr.....................Throttle opening
5. Rev .................... Engine RPM
6. Cor.....................Air correction factor
7. Knk ....................Knocking level
8. Bat.....................Battery voltage
■Rev. - [Y] display item
A plot display is made by using the engine RPM for the axis
■Setup items
1. Hi-Thrtl ................Air correction factor setting (throttle opening, large)
2. Lo-Thrtl ..............Air correction factor setting (throttle opening, small)
3. TH-Point.............Throttle opening setting
4. Ne-Point.............Air correction engine RPM setting
5. Dec.-Air..............Deceleration Air upper limit setting
6. Knk Set................Knocking signal correction
7. Data File ............Data file control
■Setup items
1. Sensor Type....... Sensor type and sensor number setting
2. Car Select ...........Number-of-cylinders and throttle type setting
3. Sensor chk..........Sensor check
4. Disp Scale..........Display scale setting
5. Warning Set.......Warning output setting
6. Pass Lock............Password setting/change
7. VFD Bright .........VFD brightness adjustment
8. Program Ver....... Program version check
9. Initialize..............All data initialization

18
Functions and Operations in the monitor mode
Main menu 【Monitor】
[Contents of items]
1. Afl ..................Airflow (Hot wire/Flap) usage ratio
2. Prs................ Intake pressure
3. Kar ............... Karman sensor frequency
4. Thr................ Throttle opening
5. Rev............... Engine RPM
6. Cor............... Air correction factor
7. Knk............... Knocking level
8. Bat.................Battery voltage
[Display method]
Numeric display/analog display : Real-time display, peak hold display, and pause.
Graphic display : Real-time display, replay, and pause.
Digital/analog display : Real-time display, peak hold display.
【One of items 1 to 4 is selected and displayed】
P22．【Monitor】→【1Channel】〜【4Channel】
【A plot display is made by using the engine RPM for the axis】
P27．【Monitor】→【Rev.-[Y]】
●Regarding the 3 items Afl, Prs, and Kar, the contents that can be
displayed depend on the intake air volume measuring equipment of
the vehicle. For example, in the case of a car equipped with a hot
wire type airflow sensor, Afl can be displayed but Prs is not displayed.
NOTE
[Contents of the axis] One of the 5 items is selected and displayed.
1. Air Flow.........Airflow (Hot wire/Flap) usage ratio
2. Pressure .......Intake pressure
3. Karman.........Karman sensor frequency
4. Throttle..........Throttle opening
5. Correct..........Air correction factor
[Display method]
1-point display, 10-point display, and locus display
.....................Real-time display, replay, and pause.

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Functions and Operations in the setting mode
Main menu 【Setting】
Functions and Operations in the etc. mode
Main menu 【etc.】
1. Sensor Type...........................................................................................P44
Sensor type and sensor number setting
2. Car Select..............................................................................................P50
Number-of-cylinders and throttle sensor type setting
3. Sensor chk.............................................................................................P52
Sensor check
4. Disp Scale..............................................................................................P53
Display scale setting
5. Warning Set...........................................................................................P54
Warning setting
6. Pass Lock...............................................................................................P56
Password setting/change
7. VFD Bright..............................................................................................P58
VFD brightness adjustment
8. Program Ver. .....................................................................................P59
Program version check
9. Initialize..................................................................................................P60
All data initialization
1. Hi-Thrtl ....................................................................................................P30
Air correction factor setting (throttle opening, large)
2. Lo-Thrtl....................................................................................................P30
Air correction factor setting (throttle opening, small)
3. TH-Point..................................................................................................P32
Throttle opening setting
4. Ne-Point ..................................................................................................P34
Air correction engine revolution speed setting
5. Dec-Air.....................................................................................................P36
Reduction gear upper limit setting (for the hot wire car only)
6. Knk Set ..................................................................................................P38
Knocking signal correction
7. Data File ................................................................................................P40
Data file control

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