aRacer MINITune2 User manual

1
MINITune2 User Manual
MINITune2
User Manual
RPM 8800
TPS
WAF 12.8
AFR12.8
0%
6 Months

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MINITune2 User Manual
MINITune2 Introductions
NO.
Show
Items
Description
1
DISPLAY
Monitor Mode
Display the engine parameters
2
ADJUST
Adjust Mode
Enter the adjust mode
3
Up
Up/Increase
Change the page or increase the adjust value
4
Enter/Setup
Enter the function / Set the data / Move the cursor right way
5
Down
Down/Decrease
Change the page or decrease the adjust value
6
Back/Exit
Exit the function / Move the cursor left way
7
OLED Display
Engine parameters display
MINITune2 Function Introduction
MINITune2 is a tuning toolbox for RCMINI Plus2 that is middle level ECU of aRacer SpeedTek Inc. RCMINI Plus2
is suitable for engine modified as high flow air cleaner, exhaust pipe, CAM, or bore up 25% below. If the
modification is out of these items, we suggest user to use RC Super series ECU to have complete calibration for
best engine performance and quality. MINITune2 functions are as below:
*1 : AF1 wideband AFR module is necessary.
5
1. Monitor (Display Mode)
2. Adjust (Adjust Mode)
2.1 Fuel Base：Basic Fuel Setting (Full Range)
2.2 Fuel Adj：
2.3 Fuel Acc：Acceleration Enrich Fuel Setting
2.4 Spark Angle：Full Range Ignition Timing Setting
2.5 RPM of Idle：Target Idle RPM Setting
2.6 RPM Limiter：RPM Limited Setting
2.7 Dec Fuel Cut：Deceleration Fuel Cut Switch On/Off
2.8 Maximum Value：Maximum Value Record
2.9 Quick Shifter：
2.10 WB O2 CL：WidebandAFR Close Loop Switch On/Off (*1)
2.11 Auto Tune：Auto Tune Switch On/Off (*1)
2.12 Coolant Fan：Coolant fan turn on temperature setting (30~150°C)
2.13 Vehicle Speed Gain Setting :To correct the vehicle speed for display.
2.14 MalfCode：Malfunction Code Read
2.15 Map Set：
2.16 TPS Calibration : To set TPS% correctly (0~100%)
2.17 Set Password：Connection Password Setting
2.2.1 Fuel Setting for TPS <5%
2.2.2 Fuel Setting for TPS <15%
2.2.3 Fuel Setting for TPS <30%
2.2.4 Fuel Setting for TPS >70%
7
2
1
3
6
4
2.9.1 Quick Shifter ON/OFF
2.9.2 Trigger Mode Comp./Tens.
2.9.3 Power Cut By Fuel/Ignition
2.9.4 Duration Time
2.14.1 Save Map
2.14.2 Load Map

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MINITune2 User Manual
Adjust Mode Intrductions:
1.Basic Fuel Setting(Fuel Base)：+30~-30%
Adjust the basic fuel for all operation range. Ex: 125% means 25% fuel increase in full range.
2. Full Range Fuel Setting (Fuel Adj)：+30~-30%
There are 4 fuel items of TPS 5%, 15%, 30%, and TPS 70% base on rpm index for fuel setting. TPS 70% is the fuel
setting for over 70% throttle open, TPS 30% is the fuel setting for below 30% throttle open, TPS 15% is the fuel setting
for below 15% throttle open and TPS 5% is the fuel setting for below 5% throttle open. The others between 5~70% is
the linear interpolation as below drawing. (Cursor will track RPM for quick setting in engine running. Also, you can
adjust the value by manual selection and system will back to auto track mode if no any command in 5sec.)
3. Acceleration Fuel Setting (Fuel Acc)：+30~-30%
Increase or decrease the acceleration fuel (%) to improve the throttle response.
Real-time RPM
Wideband AFR
(work with AF1 module)
Basic fuel status (%)
Real-time RPM
Wideband AFR
(work with AF1 module)
Acceleration Fuel
Setting (%)
Fuel Acc 1650
100.0%
12.8
RPM index
Real-time RPM
Wideband AFR
(work with AF1 module)
Fuel Setting(%)
1600 2000 1650
100
100
12.8
Fuel Base 1650
100.0%
12.8
Increase fuel
Decrease fuel
Increase fuel
Decrease fuel
Right
Left /Exit (Press over 1sec)
Increase fuel
Decrease fuel
Exit
TPS
Fuel Setting
TPS 5%
TPS 15%
TPS 30%
TPS 70%

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MINITune2 User Manual
4. Full Range Spark Angle Setting (Ignition Timing)：10 ~ -20 CA
Adjustable spark angle (ignition timing) for improve the best performance or eliminate knock.
5. Target Idle RPM Setting (RPM of Idle) (System with Idle Speed Control Valve only)
Adjust target idle RPM for special applications. Such as high CAM...etc.
6. RPM Limited Setting (RPM Limiter)
Adjust RPM limit range: 3000~16000rpm. Press “Set Up”over 1sec to set up RPM limited and push “Up”or “Down”to
adjust limited RPM. Finally, press “Set Up”over 1sec to save the setting value and press “Exit”.
1600 2000 1650
0
0
10
Real-time RPM
RPM
Spark angle
adjust
RPM 1850 Idle=01
TargetRPM
Limited RPM
RPM Limiter
Idle=01
12000
Target idle RPM
1856
Increase spark angle
Decrease spark angle
Right
Increase target idle RPM
Decrease target idle RPM
Increase Limited RPM
►
Left / Exit (Press over 1sec)
Decrease Limited RPM
Right / Set up (Press over 1sec)
Left/Exit(Press over 1sec)
Real-time
Spark angle
Real-time RPM
01: Idle Mode /00: Out of idle Mode

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MINITune2 User Manual
7. Deceleration Fuel Cut Switch (Dec Fuel Cut)
Press “Enter”to turn on / off deceleration fuel cut. “ON”: Fuel cut when deceleration to improve fuel consumption,
avoid back fire and have more engine brake. “OFF”: No fuel cut when deceleration to improve throttle response and
smooth engine brake.
8. Maximum Value Record (Maximum Value)
MINITune2 can record the maximum engine variables in “Display”mode (Record items: rpm, injector usage rate,
TPS…etc) and show the value in “Maximum Value”page. The data will be cleared when you key off the ignition power.
9. Quick Shifter Setting (Quick Shifter)(You need to purchase aRacer Quick Shift Module)
aRacer Quick Shifter is for clutchless shift in acceleration that can improve acceleration and provides the driving
pleasure. When rider forces the shift lever for shift up(Quick shift sensor is compressed or tensioned ), the shift trigger
signal will be transmitted to aRacer ECU, then the engine power output interrupted by aRacer ECU(Retarding ignition
timing or Cutting fuel) for shifting up gear without clutch action.
Dec Fuel Cut
Exit
Switch ON / OFF(Press over 1sec)
RPM 9900
TEng 98
Inj 85%
Exit
Maximum Engine Temperature
Maximum Injector usage rate
☆Tips：
We recommend user to upgrade the injector
flow if the Injector usage rate is over 85%.
ON
OFF
►
TPS 80%
Quick Shifter
ON
OFF
►
Trigger Mode
Comp.
Tens.
►
Exit
Switch ON / OFF(Press over 1sec)
Page Down
Page Up
Compression / Tension Trigger
Exit
Switch Comp. / Tens. (Press over 1sec)
Page Down
Page Up
Maximum RPM
Maximum TPS

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MINITune2 User Manual
10. Wideband AFR Close Loop Switch (WB O2 CL) (With aRacer AF1 module only)
RCMINI Plus2 can work withAF1 module (wideband AFR module) for wideband AFR closed loop. Press “Enter”to turn
on / off the function. The close loop fuel correction will have more accuracy fuel control as below drawing. System will
follow the targetAFR to correct the fuel amount in real time but will not memory the correction factor in ECU.
Notes: You need to have AF1 for the Close Loop function and inhibit the function without AF1 module!!
11. Auto Tune Setting (Auto Tune) (With aRacer AF1 module only)
RCMINI Plus2 can work withAF1 module (wideband AFR module) forAuto Tune. AutoTune process the fuel map
correction to fit target AFR in full range and memory the correction result in ECU. User have to run the engine on
chassis dyno or road when engine temperature > 80℃without malfcode.After auto tune process, you can remove AF1
module!!
WB O2 CL
ON
Function ON / Function OFF
OFF
►
Exit
Switch ON / OFF (Press over 1sec)
A/F
RPM
12
13
14
Auto Tune
ON
OFF
►
Function ON / Function OFF
Exit
Switch ON / OFF (Press over 1sec)
Duration Time
Power Cut By
Fuel
Ign.
►
62.5 ms
Exit
Change Duration Time (Press over 1sec)
Page Down / Decrease Duration Time
Page Up / Increase Duration Time
Exit
Switch Fuel / Ign.(Press over 1sec)
Page Down
Page Up
Fuel Cut / Ignition Retard
Quick Shifter Acts Duration Time
Target AFR
Wideband Close Loop”ON”
Wideband Close Loop”OFF”

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MINITune2 User Manual
12. Coolant Fan Switches On Temperature (Coolant Fan)
According to the different engine situation, rider can set different engine temperature for fan action, and fan will switch
off when engine temperature below the setting temperature substract 5℃.
13. Vehicle speed gain setting (Set Speed Gain) (Only for Vehicle with Speed Sensor into ECU)
User can set the vehicle speed gain for display the vehicle speed correctly for different chain wheel or gear rate.
Vehicle Speed Gain(0~400%), 100% is the default setting, 110% is 10% vehicle speed display increase, 90% is 10%
vehicle speed display decrease.
14. Malfunction Code Read (MalfCode)
MINITune2 can show the malf code if EFI malfunctions happen. Note some malfunction code is just detected in engine
run.
Fan Action Temp.
Coolant Fan Action Temperature
92 C
►
Exit
Change Temp. (Press over 1sec)
Decrease Temp.
Increase Temp.
Speed Gain
90.6%
Exit
Increase value.
Decrease value.
Change Password. (Press over 1sec)
__
__
No malf code
Page up
Page down
Exit
►
105
Vehicle speed display

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MINITune2 User Manual
Malf Code
Description
Malf Light
P0106 AP Ration
Map sensor(Manifold Air Pressure) value is incorrect
14
P0107 AP Open
Map sensor broken wire
13
P0108 AP V
Map sensor short to battery
13
P0112 T-A GND
Intake air temperature sensor short to ground
22
P0113 T-A Open
Intake air temperature sensor broken wire
22
P0117 T-Eng GND
Engine temperature sensor short to ground
28
P0118 T-Eng Open
Engine temperature sensor broken wire
28
P0122 TPS Open
TPS broken wire
15
P0123 TPS V
TPS short to battery
15
P0231 Pump Open
Fuel pump broken wire
11
P0232 Pump V
Fuel pump short to battery
17
P0261 INJ Open
Injector broken wire
39
P0262 INJ V
Injector short to battery
39
P0263 INJ Over
Injector usage rate is too high (>90%)
53
P0298 Eng Over T
Engine temperature over heat
35
P0335 CRK Err
Crank sensor error
34
P1335 CRK Open
Crank sensor broken wire
12
P0351 IGN V
Ignition coil short to battery
33
P1351 IGN GND
Ignition coil short to ground
33
P0563 Batt Vhigh
Battery voltage is too high
46
P1500 Roll Act
Rollover switch is triggered
49
Attention：Malfunction Indicate Light (MIL)
1. How to enter the MIL mode: In key on status, key off /on 3 times within 3 sec and keep key switch on then system
will enter MIL flash mode and MIL will flash 2 times.
2. Every malfunction flash code includes two digits. Ex: If flash code is “35”, The MIL will flash 3 times first (the
interval time is 0.5 sec) and delay 1.5sec to flash 5 times(the interval time is 0.5sec).After 4sec, MIL will start to
flash next malfunction code or repeat the malfunction code according to how many malfunction in the moment.
Attention：Clear Malf Code & Learning Value (Reset ECU)
1. In key on status, key off / on 10 times within 15 sec and then system will enter clear mode and MIL will flash “20”.
Then key off again, the learning value and malf code will be cleared.
15. MAP Setting (MAP Set)
MINITune2 can save yourself 3 maps and load default maps inside. User can edit the file name on yourself 3 maps.
MAP 1
User define 1
MAP 2
User define 2
MAP 3
User define 3
MAP Default
MiniTune2 Default Value

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MINITune2 User Manual
16. TPS Calibration (TPS Learn)
Click “Enter”, and then wide open throttle to complete TPS calibration.
Save Map
Load Map
Up
Down
Select
Load MINITune default
data
Save yourself Map
Map 1
Map 2
►
Up
Exit
Down
Select (Press over 1sec)
Select what map file you want
to save
Map 1
Map 2
►
Up
Left / Exit (Press over 1sec)
Down
Right / Select(Press over 1sec)
Select the file words you want
to save
Select ”Save Map”or
“Load Map”, and press
“Enter”to next page
Select the file words, and
press “select”to save.
Exit
TPS Learn
Press Enter
Wide Open TPS
Click “Enter”and wide open
throttle
Wide open throttle until it shows the “OK”on display
OK
■■■■■■■■■
☆Tips：
You need to do the TPS calibration when you
change throttle body or wide open throttle but
TPS can’t reach over 95% or you don’t wide
open throttle but TPS has reached 100%

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MINITune2 User Manual
17. Connect Password Setting (Set Password)
User can set the password for tuning data security. (Default Password: 888888)
Flash ECU by Mini-2 Flash Tool:
RCmini Plus2 ECU could be flashed base MAP from cloud. You can choice the suitable MAP for your motorcycle.
And you can set the rpm limiter, ON/OFF deceleration fuel cut, ON/OFF quick shifter and ON/OFF wide band AFR
close loop control.
Flash Steps:
1. Download and install Mini-2 Flash Tool from aRacer’s website.
2. Click to update the data base(Only first time install software or new base map update) connect “iLink”
cable in ECU & PC Click to refresh connection port
3. Turn-on ignition powerClick to connect with ECU Select the manufactory Select the vehicle model
4. Set ON/OFF deceleration fuel cut, ON/OFF quick shifter, ON/OFF A/F close loop control, and the rpm limiter
Select the suitable base Map
5. Process the flash to ECU After flash complete, please turn-off the ignition power 10 seconds, and finish
the flash.
Change Password. (Press over 1sec)
Enter New Key
►
888888
Increase value.
Exit
Decrease value.

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MINITune2 User Manual
Variables Introductions in Display Mode:
Recommend Tuning Process for RCMINI2
NO
Name
Description/Unit
NO
Name
Description/Unit
1
RPM
Engine Speed
11
At
Atmosphere (kPa)
2
SA
Spark Angle (CA)
12
Bat
Battery Voltage(V)
3
WAF
Wideband Air Fuel Ratio
13
O2V
Narrow Band Oxygen Sensor Voltage (mV)
4
AFR
Target Air Fuel Ratio
14
CL
Close Loop Fuel Correction Rate (%)
5
TAir
Intake Air Temperature (℃)
15
WBCL
Wideband AFR Close Loop Indicator (01:ON / 00:OFF)
6
TEng
Engine Temperature (℃)
16
Malf
Malfunction (01:Malfunction Act / 00:No Malfunction)
7
TPS
Throttle Position (%)
17
ISC
Idle Speed Control %
8
FA
Fuel Adjustment (%)
18
MisC
Crank error Count
9
PW
Fuel Pulse Width (ms)
19
Product ID
ECU ID
10
Inj
Injector Usage Rate (%)
20
“Fuel Base”setting
：
Adjust “Fuel Base”to check if WB AFR data are between
12~13.5 in idle & open throttle without loading.
And then,
you can hold the rear brake slightly to check if WB AFR
closed to 12~13.5 with loading. Do some adjust of Fuel
Base to make WB AFR close to target AFR with & without
loading.
“Fuel Adj”for full range adjustment on road load
：
Please adjust and check the WB AFR data on “TPS 5%”(<
5%),“TPS 15%”(<15%), “TPS 30%”(<30%) and then adjust &
check the WB AFR data on “TPS 70%”(> 70%)
“Spark Angle”adjustment
：
Adjust “Spark Angle”for best performance in WOT
without knocking. If knock happens in any situation,
please retard the “Spark Angle”to avoid knock.
Use Default MAP inside or download Map on Cloud database.
Then start engine till warm up over 80°C
The other items adjustment
：
You can check the setting of “Fuel Acc”, “RPM of Idle”,
“RPM Limiter”, “WB O2 CL”, “Dec Fuel Cut”…etc
The mechanism of ECU & MiniTune2 data:
The adjustment data will be uploaded and saved to ECU
from MiniTune2. But the data in MINITune2 will be
deleted if user key off the power (Or user can use
“
MAP
Set
”
function to save it in MiniTune2) and MiniTune2 will
read back the data from ECU when user key on the
power again.
☆Tips：
1. Before tuning, please confirm your RCMINI
Plus2 ECU type match with your target vehicle.
2. For the best tuning result, please use AF1
wideband AFR module (WBAFR) for setting.
☆Tips：
If the engine volume bore up from stock 125cc to
155cc, please set “Fuel Base”=124%
(
155
125 =124%
)
If also upgrade injector flow to 25%, please set
“Fuel Base”=99% (
155
125 ÷
125% = 99%
)
☆Tips：
User can check the low loading(TPS<30%) WB
AFR status & adjust that by control rear brake in
moderation when main stand on, and then check
the WOT WB AFR status & adjust that on the
chassis dyno or on the road.
☆Tips：
User can adjust spark angle for best performance
on dyno meter.

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MINITune2 User Manual
Attention:
No any stick the double-sided adhesive on the bottom board to fix Minitune2 with motorcycle or it may damage
the bottom board when user pulls off the Minitune2.
To avoid the wrong fixing method to damage the Minitune2, aRacer recommend user using the aRacer aluminum stand
to fix the Minitune2 as the following pictures. The stand has attractive design and giving comprehensive protection for
the Minitne2.