ARacer RCmini X is a Complete engine management system that allows you to make all adjustments via wifi to your smartphone/tablet. Pair this up with the correct fuel injector size and you could easily tune your engine to run.   Tuning could be done on a dyno (highly recommended) or safely on a backroad/street using a wideband o2 gauge and sensor with the autotune function.    Optional AF2 option is available and recommended to be used with the RCmini X to have the ECU Auto-Tune.  
RC Mini X ECU Hardware Features:
A quicker 4-core MCU computing speed processor (200% increase!)
Built-in wifi connectivity with 360-degree antenna (20% connection strength)
Redesigned external wiring which allows direct connection to AF2 module and/or quick-shifter
RC Mini X ECU Software Features:
FREE APP DOWNLOAD! No longer required to pay $16 for the Aracer Smart App
Improved AutoTune fuel adjustments and feedback with the use of the AF2
Each ECU has an exclusive ID, which the users can pay by credit card online to unlock special add-on options
WiFi connection allows for Laptop or SmartPhone connection
QuickBurn (Flash) is shortened by 200% (less than 60 seconds)
RC Mini X Function Features:
TCS traction function
The original factory is not equipped with TCS, and it can be easily started in the rainy and slippery state after it is turned on
The original factory is equipped with TCS, which can provide 3 stages adjustable
3rd segment original narrowband O2 sensor fuel correction
Adjustable fuel injection timing
Response Button power response MAP adjustment → After the upgrade, open and hide the 3 target air-fuel & ignition angle diagrams
Guided idle speed setting
Guided quick discharge trigger pressure setting
New style Backfire/Idle loop control
New analysis tools 
RCmini X ECU 
Brand-new 4-core MCU, the computing speed is increased by 200%
20x17 (RPM x TPS%) fuel adjustment
20x9 (RPM x TPS%) ignition angle adjustment (pay to open another 2 MAP)
Manifold Air Pressure base for inlet air amount calculation
Environment temp and Baro compensation available
Increase Rev Limit. Pit Limit.
Increase almost 10% above power after calibration (depend on engine model)
Easy plugin (remove stock ECU and install RC1 ECU without any harness modified)
Same connector as stock ECU
RCmini 5 ECU meet IP67 specs
Support Auto-Tune with aRacer AF2 wideband sensor module
Built-in Wi-Fi and 360-degree antenna design (no additional wiring required), the connection signal strength is increased by 20%