RSTuner is an easy-to-use RENAULT tuning and diagnostic solution developed by Fastchip, consisting of a software and hardware component, geared towards RS series engines and end-users.

What is RSTuner?

RSTuner is an easy to use software application, developed by Fastchip for use in conjuction with its VCI hardware, specifically designed for diagnosing and recalibrating Renault RS series engines.

RSTuner enables enthusiastic RS owners to reprogram their ECU with one of the calibration files from our database, stock or modified, and then log diagnostic data directly from the ECU through the diagnostic port.

Optionally a custom tailored engine calibration can be made to meet different engine setups and/or fuel quality.
All the user has to do is, to provide the RSTuner generated data loggings and performance analysis. Reprogramming the ECU can be done as many times as required on the same vehicle at no extra cost.


  • PC / laptop with 1 free USB port
  • Basic grasp of the English language
  • A supported vehicle


  • Windows 11
  • Windows 10
  • Windows 8
  • Windows 7
  • Windows Vista
  • Windows XP (32bit only)


With modules, you can easily extend the functionality of your RSTuner.


Use RSTuner to repogram your car with stock, modified, or bespoke calibrations.

Easy reprogramming.

RSTuner makes do-it-yourself reprogramming your car easy.

Any map, any time.

Switch between maps as often as you like.

Our included Stage 1/2 map will NOT lock your ECU!

Unless you request us to do so (to prevent dealer overwriting for instance)


Updating engine calibration AKA 'chip tuning'
Reprogram your car as often as you wish. Included with every RSTuner Kit purchase is a map for your car. We will either email the map, or it can be downloaded from our ever growing database.
Backup of original engine software
Numerical display of available engine parameters*
Graphical display of available engine parameters*
ECU Network Scan
Performance Analyzer
Data logging, reviewing and saving
Fault code reading and erasing
Actuator testing
Flight Data Recorder (Premium VCI hardware only)
iMFD DM-5 gauge support (Premium+ VCI hardware only)
(optional) Airbag, ABS, EPS, TCM support
(optional) Personalized custom engine calibration

Module Examples

AIO Suite (Map Tracing & Editing)
AIO (All-In-One) Suite gives you the tools to tune your own calibration.

  • Live map tracing of various ECU parameters for detailed analysis of engine performance
  • Easy editing of your calibration file
  • Integrated and automatic checksum / CRC calculation
  • and more!

Vehicle Dynamics
OBD-II support
ABS support
This is only a small sampling of the modules we have available, please click the button below to view them all.

A great partnership.

RSTuner works in combination with our Fastchip VCI hardware.

Programming Tutorial

One of our tutorial videos showing you how easy it is to program your own car with RSTuner. Programming can be done as often as you want!

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Video Tools

For the video enthousiast RSTuner provides a few options to integrate data logging made with RSTuner into your videos.

Graphical Overlay

RSTuner provides image sequence export complete with chroma key of your data logs so you can overlay any Live Data or Vehicle Dynamics Graph onto your video.


A simpler way to integrate data from your logs into your videos is with our subtitle export. Select your parameter(s) and RSTuner will export an .srt file with your data!