EVOMSitECU Tuning for 991 GT3 / RS

Product type: Performance Tuning
  • 911 GT3 RS - 991
  • 911 GT3 - 991.2
  • 911 GT3 - 991
  • More

Product Description

The EVOMSit performance software for the Porsche 991 GT3 is a simple yet effective way to improve the performance of a completely stock or slightly modified 3.8L / 4.0L engine. Our rigorous testing, attention to detail, and stringent quality control ensures this upgrade is in a league of its own in terms of power and engine safety. Thoroughly tested on both the street and racetrack with both 91 and 93 octane pump fuels. The seamless integration of our software tuning enhances the overall power and drivability of this engine for uncompromised performance. This is done via the use of the included TUNEit hand-held upload/download programmer OBDII tool, so no ECU removal is required. OBDII tool/software also comes with a code reader for diagnostics.

EVOMSit ECU Tuning Features include:

  • Stage 1 software programmed for stock exhaust / standard OEM catalysts
  • Stage 2 software programmed for aftermarket exhaust / standard OEM catalysts
  • Takes advantage of the untapped potential of the engine without excessive mechanical stress
  • ~17 HP / ~10 ft.lb. TQ Gain – Software Alone 
  • Dyno Tested on 91 Octane Fuel - 93 Octane mapping yields slightly higher power gains
  • All engine protection functions remain intact
  • OBDII diagnostic capability is fully retained
  • Calibrations for both 91 octane (95 RON) and 93 octane (98 RON) specific fuel 
  • Improved throttle response / overall drivability 
  • Extensively tested, performance validated
  • Flash at home in your garage with the TUNEit hand-held tool 

The EVOMSit TUNEit handheld unit is included with your ECU Tuning purchase. This unit allows you to download and install our performance software via your car's OBDII diagnostic port. Simply plug in the handheld unit via included OBDII cable, read out your file, and email it to us. (Access to an email-enabled PC with Windows operating system and USB port is done via the included USB cable.) We will email you back (usually within 24 hours) a performance file that you can upload yourself.

NOTE: Installation requires the use of an automobile BATTERY CHARGER (10+ AMP)

EVOMSit TUNEit Handheld Unit Features Include:

  • OBD Port Flash with EVOMSit GEN 2 Tuning Tool
  • Tuning Tool stores multiple Tuned files as well as Original software. At anytime, stock software can be installed without the need of internet or a laptop
  • Truly optimized power while maintaining OEM engine protection features
  • Factory smooth power delivery – most applications smoother than factory
  • Full data backup of each ECU that is upgraded
  • Diverse tuning portfolio supporting different hardware, fuel grades and climates
  • Optimized software for specific hardware
  • Integrated Intelligent Switching Technology™ (IST) with Octane Sensing Timing Advance

Dyno Plots for 3.8L 991 GT3