APR

APR ECU Upgrade - 3.8T Turbo (991.2)

Unlock hidden horsepower and torque with our performance tuning software for your vehicle's Engine Control Unit (ECU).

Part # ECU-38T-9912
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$1,999.95
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APR's ECU Upgrades are the best dollar-per-horsepower modification one can make to improve engine performance. The upgrades dramatically increase horsepower and torque, making for an exceptionally quicker and more exciting vehicle. This is made possible through APR's optimization of the factory engine management system to take full advantage of the engine's capabilities, without needing any end user adjustment. The ECU Upgrades are available with various features and supported octane levels and each stage is compatible with most typical bolt-on modifications. The software is installed to the vehicle's factory ECU through the OBD-II port, resulting in a clean and headache-free install. Furthermore, for those looking for tuning with a limited powertrain warranty, APR Plus has you covered!

Features:

  • Delivers up to 612 HP with 623 FT-LBS of torque (APR Plus)
  • Delivers up to 612-688 HP with 623-679 FT-LBS of torque (APR Stage 1)
  • Delivers up to 654-754 HP with 627-701 FT-LBS of torque (APR Stage 3)
  • Max gains of +98 AWHP with +107 AWFT-LBS of torque (APR Plus)
  • Max gains of +98-165 AWHP with +107-165 AWFT-LBS of torque (APR Stage 1)
  • Max gains of +122-213 AWHP with +121-188 AWFT-LBS of torque (APR Stage 3)
  • Supports 91 AKI, 93 AKI, 100 AKI, 104 AKI, and E60-E85 fuel grades
  • Ethanol and race fuel support for maximum power on the race track
  • Optional factory term limit matching limited powertrain warranty with APR Plus
  • Multiple stages of performance offered
  • Switchable power levels through Porsche’s Normal, Sport, and Sport+ profiles
  • Linear throttle mapping
  • Standing RPM soft limiter increased
  • Left-foot braking / brake boosting added
  • Optimized thermal management with various engine safety protection routines added
  • Auto Start/Stop defaults to the off position
  • Enhanced power delivery and drivability through recalibrated exhaust flap actuation
  • Speed limiter removed
  • No hardware required for APR Plus or Stage 1 (Software only)
  • Supports standard bolt on modifications
  • Supports Turbo S Turbochargers (Stage 3)
  • Free lifetime updates
  • Direct OBDII port flash (No ECU removal)
  • 30 day money back guarantee

About APR

At APR our sole mission is to engineer only the highest quality tuning solutions for Volkswagen, Audi and Porsche vehicles ensuring the enthusiast the ultimate driving experience while consistently providing the enthusiast the ultimate in customer care and support.

Brand APR
Emission Code4
Engine AspirationTurbocharged
Engine ConfigurationH6
Engine Displacement3.8L
Engine FamilyPorsche 9A1
Engine OrientationLongitudinal
Fuel TypeGasoline
MarketNAR
ROW
Product TypeECU Upgrade
Part NumberECU-38T-9912
4

This part is legal for sale or use on Racing Use Only Vehicles

The following vehicles are considered Racing Use Only Vehicles:

  • Racing Use Only Vehicles are vehicles that are used exclusively for competition that are not registered and that may never be used on the street

WARNING: It is against the law to install this part on an Emissions Controlled Vehicle

Important fuel quality information
Important fuel quality information
Find your boxcode and revision
Find your boxcode and revision
APR Plus Warranty Booklet
APR Plus Warranty Booklet
Only use fuel equal to or higher than specified. Never use a lower octane fuel. Always follow our fuel guide, especially with race fuel and Ethanol, where available. Dynos are for reference only. Results will vary. Contributing factors include the vehicle condition, vehicle setup, dyno type, dyno setup, environmental factors, fuel quality, and more. When describing fuels, the North American Region (NAR) uses the Anti-Knock Index (AKI), (RON+MON)/2, or (R+M)/2. The Rest of the World (ROW) uses RON. RON is Research Octane Number and MON is Motor Octane Number.

Porsche Tech Talk

Driving Modes, Features, and Safety

Driving Modes - Each upgrade offers a host of improvements beyond power alone. Using Porsche’s Normal, Sport, and Sport Plus modes offers varying levels of output while retaining all of the unique characteristics present in each mode. Sport and Sport plus modes give you full power and torque. Normal mode give you modest increase over stock, but focuses on economy and comfort. We’ve optimized boost, fueling, ignition, cams, and more to achieve greater power and torque in all scenarios.


Features - In Sport Plus mode we’ve reduced turbo lag during reapplication of the throttle by building boost while off the throttle. We have linearized the pedal maps for a more predictable throttle response curve, which works exceptionally well on the track. We’ve enabled left foot braking, and brake boosting. The speed limiter has been removed. We’ve optimized the software to better handle larger wheels without excessive torque interventions. And finally we’ve inverted the start stop functionality so the vehicle starts with this feature disabled.


Safety - With many customers tracking their Porsche, safety is paramount in our calibration strategy. Through the use of extreme datalogging equipment and additional sensors, thermocouples, and transducers, our engineers were able to fully optimize the ECU for advanced safety routines. This includes implementing several routines not enabled from the factory. The entire thermal management system is optimized to reduce engine bay temperature, and reduce intake air temperature, while also implementing advanced protection routines to prevent oil temperature from achieving unsafe levels. The exhaust crackles disable when temperature thresholds are crossed, and are only enabled in sport mode. Next, we help protect the engine from LSPI by preventing the engine from being lugged out in tall gears. We also protect the turbo from damaging compressor surge, and add in turboshaft overspeed protection. We’ve enabled new temperature protection routines to prevent the engine, exhaust, and other components from overheating, and have implemented temperature management strategies that are fully mindful of the platform’s limited fueling capabilities. We’ve optimized the injection strategy to not only deliver a fatter torque curve and better spool, but to reduce the chances of knock, and torque dips. This is also achieved alongside per cylinder ignition advance and fuel trimming.

APR ECU Upgrade Stages

APR’s ECU Upgrades support various octanes both with or without any hardware modifications. Each stage is fully compatible with an upgraded intake, intercooler, exhaust, or other minor bolt on modifications. Stage 3 supports Turbo S turbochargers. Unlike many platforms, no additional software tweaks are required to properly utilize a high flow race exhaust system as the factory system poses minimal restriction.

APR Stage 1

The APR Stage 1 ECU Upgrade is the first step towards making more power! This simple upgrade requires no engine hardware modifications, and produces 612-688 HP with 623-679 FT-LBS of torque, depending on octane. Gains as high as +98-165 AWHP with +107-165 AWFT-LBS of torque are available throughout the power band. To get more power, the vehicle can be outfitted with an upgraded intake, cooling, or exhaust system. Additionally jumping to Stage 3 will allow for Turbo S turbochargers.


APR Stage 1 is available for 91 AKI, 93 AKI, 100 AKI, 104 AKI, and E60-E85 fuel grades in North America, and 95 RON, 98 RON, 104 RON, 108 RON, and E60-E85 in the Rest of the World.

APR Plus

The APR Plus ECU Upgrade is the first step towards making more power, and it includes our limited powertrain warranty. This simple upgrade requires no engine hardware modifications, and produces 612 HP with 623 FT-LBS of torque. Gains as high as +98 AWHP with +107 AWFT-LBS of torque are available throughout the power band, making the vehicle exceptionally quicker in all scenarios.


The APR Plus ECU Upgrade matches the performance of our Stage 1 ECU Upgrade (91 octane). To get even more power, you can add any of our other Stage 1 compatible products and still be covered under the APR Plus warranty! If you're not interested in the APR Plus limited powertrain warranty, and want even more power, check out our other Stages.

Stage 3 (Turbo S Turbos)

The APR Stage 3 with Turbo S Turbos ECU Upgrade is the next step towards making more power! This simple upgrade only requires factory Porsche 991.2 911 Turbo S turbos and no other engine hardware modifications, and produces 654-754 HP with 627-701 FT-LBS of torque, depending on octane. Gains as high as +122-213 AWHP with +121-188 FT-LBS of torque are available throughout the power band. To get more power, the vehicle can be outfitted with an upgraded intake, cooling, or exhaust system.


APR Stage 3 with Turbo S Turbos is available for 91 AKI, 93 AKI, 100 AKI, 104 AKI, E60-E85 fuel grades in North America, and 95 RON, 98 RON, 104 RON, 108 RON, E60-E85 in the Rest of the World.

Horsepower and Torque Dyno Charts

Select a DynoSelect a Dyno Type
38t_9912_911_turbo_s0_vs_s1_normal_91_c.png
Porsche Rear Engine Dyno Testing Notes - This engine is extremely sensitive to intake air temperature (IAT) due to the rear engine and rear cooling design. Power figures on a stationary dyno will vary wildly with limited airflow compared to real world conditions. As IAT increases the calibration will intentionally reduce power to protect the engine.

APR Calibration Report

StageHPTQMax GainMax Gain
Stock As Reported by Porsche 540 HP 523 FT-LBS
Stock As Measured by APR 552 HP 541 FT-LBS
APR Plus (Sport/Sport+)
91 AKI612 HP 623 FT-LBS +98 HP +107 FT-LBS
Stage 1 (Sport/Sport+)
91 AKI / 95 RON612 HP 623 FT-LBS +98 HP +107 FT-LBS
93 AKI / 98 RON637 HP 671 FT-LBS +135 HP+148 FT-LBS
100 AKI / 104 RON655 HP 671 FT-LBS +138 HP +148 FT-LBS
104 AKI / 108 RON661 HP 672 FT-LBS +142 HP +150 FT-LBS
E60-E85688 HP 679 FT-LBS +165 HP +165 FT-LBS
Stage 3 w/ Turbo S Turbos (Sport/Sport+)
91 AKI / 95 RON654 HP 627 FT-LBS +122 HP +121 FT-LBS
93 AKI / 98 RON685 HP 665 FT-LBS +151 HP +149 FT-LBS
100 AKI / 104 RON709 HP 669 FT-LBS +172 HP +166 FT-LBS
104 AKI / 108 RON715 HP 674 FT-LBS +178 HP +171 FT-LBS
E60-E85754 HP 701 FT-LBS +213 HP +188 FT-LBS
Only use fuel equal to or higher than specified. Never use a lower octane fuel. Always follow our fuel guide, especially with race fuel and Ethanol, where available. Dynos are for reference only. Results will vary. Contributing factors include the vehicle condition, vehicle setup, dyno type, dyno setup, environmental factors, fuel quality, and more. When describing fuels, the North American Region (NAR) uses the Anti-Knock Index (AKI), (RON+MON)/2, or (R+M)/2. The Rest of the World (ROW) uses RON. RON is Research Octane Number and MON is Motor Octane Number.

The APR Difference

Who we are - We’re a global automotive engineering firm nestled in Opelika, Alabama. Our 80,000ft² state-of-the-art facility is home to some of the best engineers in the industry, who have mastered hundreds of engine management systems. We have multiple engine and chassis dynos, and the resources necessary to create our ECU Upgrades in-house, from the ground up! We're not a new company either. We've been around since the 90's and we have a strong financial backing to ensure we'll be here to support you for decades to come!


What we do - We optimize everything to make your engine more powerful. We adjust air-fuel ratios, advance ignition, increase boost pressure, alter cam positions and lift profiles, and more, all depending on the type of engine and management system, of course! We don’t take shortcuts, and we don’t take risks. We do it the right way.


How we differ - With our proprietary calibration and direct ram access data logging tools and operating system code changes, we’re able to make some of the strongest and fastest ECU upgrades, without needing costly end user adjustments. We work with the ECUs intelligent modeling and closed-loop systems, and beta test in multiple environments to create upgrades that work no matter where you drive!

APR Software Pricing Guide

Our performance software upgrade is available in multiple stages with optional features.

APR Plus
APR Plus ECU Upgrade$3,999.95
APR Stage 1
APR Stage 1 ECU Upgrade$1,999.95
APR Stage 1 ECU Upgrade from APR PlusFREE
APR Stage 3 with Turbo S Turbos
APR Stage 3 ECU Upgrade$2,999.95
APR Stage 3 ECU Upgrade from APR Plus or Stage 1$999.95

Purchasing, Guarantee, and Updates

How to Purchase - APR Software Upgrades are only available through Authorized APR Dealers. The dealer will connect to your vehicle, and install the update.¹


Money-Back Guarantee - Try our Software Upgrades for up to 30 days, risk free! If you are not satisfied, return to an APR Dealer to have it removed and refunded.²


Free Updates - If we make an update, add a standard feature, or if the manufacturer issues an update, you are entitled to a free update.³


1. APR Software may not be available for all vehicles. Stages, programs, and features may not be available for all ECUs.
2. Excludes some Software Upgrades, such as those included with a hardware purchase. Labor charges are at the discretion of the installer.
3. Subject to availability. Labor charges are at the discretion of the installer. Applicable to the original purchaser. Second hand owners may inquire with an APR Dealer about a software license transfer fee.

*Free Shipping & Handling only offered to the contiguous US on orders over $100, excludes clearance parts and oversized packages.

Some parts are not legal for use in California or other states with similar regulations.