The ABT Power Upgrade for the M133 Engine: A Comprehensive Guide to Costs and Performance Gains

The Mercedes-Benz M133 engine, a turbocharged 2.0-liter four-cylinder, delivers impressive output from the factory—around 355 to 381 horsepower depending on the variant. Yet for many enthusiasts, the desire for even sharper throttle response and stronger mid-range torque fuels the search for an upgrade. The ABT Power Upgrade has emerged as a go-to solution, offering a balance of proven gains, factory-backed quality, and relative affordability. Whether you drive an A45 AMG, CLA45 AMG, or GLA45 AMG, this remap can transform the car's character without requiring extensive hardware changes. In this article, we break down the true cost, real-world performance improvements, installation steps, and critical factors to consider before adding the ABT Power Upgrade to your M133.

Understanding the M133 Engine

Launched in 2013, the M133 engine was Mercedes-AMG's first turbocharged four-cylinder, designed to deliver both high specific output and everyday usability. It features a twin-scroll turbocharger, direct injection, and a forged steel crankshaft. The engine is found in the first-generation A45, CLA45, and GLA45 models, as well as the later facelifted versions that pushed output to 381 hp.

Key Specifications

  • Displacement: 1,991 cc
  • Bore x Stroke: 83.0 mm x 92.0 mm
  • Compression Ratio: 8.6:1
  • Factory Power Output: 355 hp (early models) / 381 hp (facelifted)
  • Factory Torque: 450 Nm (332 lb-ft) early / 475 Nm (350 lb-ft) later
  • Turbocharger: Twin-scroll, maximum boost around 1.8 bar factory

The M133's robust internal construction and efficient cooling system make it an excellent candidate for tuning. The ECU's ability to adapt fuel maps and boost targets safely with software-only changes is well documented, and the ABT Power Upgrade leverages this headroom.

What Is the ABT Power Upgrade?

ABT Sportsline, a renowned German tuner with a strong relationship with Audi and Volkswagen Group vehicles, also offers engine control unit (ECU) remapping for Mercedes-AMG models through its ABT Power Upgrade program. Unlike generic piggyback modules, the ABT solution uses a specialized ECU plug-in module or full ECU software reflash that optimizes fuel injection timing, ignition angle, boost pressure, and throttle mapping to squeeze additional power while maintaining safety margins.

The upgrade is sold as a complete kit (software license and necessary adapter cables) and is typically installed by authorized ABT dealers. One of its key selling points is that it often retains the factory warranty when installed through official channels and does not trigger permanent error codes in the engine management system.

Primary Benefits of the ABT Power Upgrade

  • Horsepower increase: Claims of +40 hp over factory (to around 395–420 hp depending on model variant).
  • Torque boost: Up to +50 Nm (37 lb-ft) yielding roughly 500–530 Nm.
  • Sharper throttle response: Reduced turbo lag from optimized boost maps.
  • Improved acceleration: 0–100 km/h (0–62 mph) times drop by 0.3–0.5 seconds.
  • No hardware changes required: Works with stock intercooler, exhaust, and intake.
  • Drivability: Linear power delivery suited for daily driving.

Cost Breakdown of the ABT Power Upgrade

Pricing varies by country, installer labor rates, and whether the upgrade is purchased as a standalone or installed as part of a broader performance package. Below is a realistic breakdown.

Kit Components

  • ABT Power Upgrade ECU module or software license: $1,500 – $2,000 USD (approximately €1,300 – €1,700).
  • Installation labor (1–2 hours): $200 – $500 at an authorized dealer or specialized shop.
  • Optional: Engine oil change and filter (recommended before tuning): $100 – $200 if not included in service.
  • Additional hardware (rarely needed): If a high-performance air filter or spark plugs are recommended by the tuner, add $150 – $300.

Total estimated cost: $1,800 – $2,700 for a complete professional installation. Some dealers offer bundle pricing when combined with an ABT exhaust or suspension kit, which can reduce the effective cost.

For a price reference, check ABT's official product page for the M133 (ABT Sportsline Mercedes-AMG tuning). Keep in mind that used or second-hand modules are rarely available and often not transferable between vehicles due to VIN-locking.

Measured Performance Gains

Independent dyno tests and owner-submitted logs show consistent gains from the ABT Power Upgrade. While claimed figures are often conservative, real-world results confirm substantial improvements.

Dyno Results Comparison (Typical for M133 355 hp variant)

Metric Stock With ABT Upgrade Gain
Max Wheel Horsepower 340–350 hp 380–395 hp +40–50 hp
Max Wheel Torque 430–450 Nm 480–510 Nm +50–60 Nm
0–100 km/h (0-62 mph) 4.2–4.6 sec 3.8–4.1 sec –0.4 to –0.5 sec
1/4 Mile 12.5–12.8 sec 12.0–12.3 sec –0.5 sec

Note: Results vary with fuel quality, ambient temperature, and vehicle condition. The torque increase is most noticeable from 2,500 to 4,500 rpm, giving strong mid-range pull without spiking peak cylinder pressure.

For independent verification, see dyno sheets posted on forums like MBWorld or the ABT Power Upgrade discussion threads at BenzWorld.

Installation Process and Requirements

The installation is straightforward for a trained technician. It does not require removing the ECU from the car—the ABT module or flashing tool connects through the OBD-II port or via the engine control unit's diagnostic connector under the hood.

Step-by-Step Outline

  1. Vehicle check: Scan for fault codes and confirm battery voltage is above 12V.
  2. Connect ABT tuning tool: Access the ECU using ABT's proprietary software and cable. Some kits use a pass-through module that remains installed.
  3. Upload calibration file: The new map is written to the ECU. The process takes about 15–20 minutes.
  4. Post-install diagnostics: Verify no error codes; perform a test drive to check for boost leaks or irregular idling.
  5. Finalization: If the upgrade includes an additional power module (external device), it is mounted in the engine bay in a weather-protected location.

Time required: 1–2 hours. Most shops advise scheduling the upgrade at the same time as an oil change to ensure the engine is in peak condition.

The ABT upgrade is VIN-locked, meaning the file cannot be used on another car. If you later sell the vehicle, you can have the stock map reloaded (for a fee, usually around $200–$400), but the hardware module remains tied to the original VIN.

Key Considerations Before Upgrading

No performance modification comes without caveats. The following points should be weighed carefully.

Warranty Impact

If installed by an authorized ABT dealer, the upgrade is typically covered under ABT's own two-year warranty on the module, and it often preserves the Mercedes factory warranty on unrelated components. However, any engine failure that can be traced directly to the increased boost may be denied. Always confirm warranty terms in writing before purchase.

Insurance Notification

Many insurance policies require disclosure of aftermarket tuning. While a 40 hp increase is unlikely to cause premium spikes with some specialty insurers (e.g., Hagerty, Grundy, or specialist performance insurers), failure to disclose could void your policy in case of a claim. Shop around for quotes before installing.

Emissions Compliance

The ABT Power Upgrade retains the OBD-II readiness monitors and does not trigger a check engine light in most cases. However, it pushes the engine outside factory emissions certification. In regions with strict annual inspections (e.g., California or Germany with TÜV), you may need to revert to stock software for the test. ABT offers a "de-flash" service, but not all markets approve the tune for road use.

Long-Term Reliability

The M133 engine has proven robust even with stage 1 tunes. The ABT upgrade is considered conservative—it stays within the turbo's efficiency island and does not exceed fuel injector duty cycle limits. Owners who follow proper maintenance (oil changes every 5,000–7,500 miles, using a high-quality full synthetic) report many tens of thousands of trouble-free miles. However, the increased heat load can accelerate wear on the turbocharger bearing if the car is tracked repeatedly without cooling mods. Monitoring oil temperature and letting the engine cool down after hard driving is prudent.

Alternatives to the ABT Power Upgrade

Several other tuners offer software-only tunes for the M133. Below is a brief comparison to help you decide.

RENNtech ECU Flash

RENNtech's tune for the M133 claims up to 450 hp (330 kW) and 575 Nm on 93 octane fuel. It is more aggressive than ABT and includes a lifetime warranty on the ECU software. Pricing is similar ($1,700–$2,200). RENNtech tunes often require upgraded spark plugs and sometimes a colder thermostat. More power, but also more risk of triggering limp mode on lower octane fuel.

Burger Motorsport JB4

JB4 is a piggyback tuner that adjusts boost and fuel trims without modifying the ECU file. It costs around $500–$700 and offers user-adjustable maps via a smartphone app. While cheaper and easy to remove, it does not optimize ignition timing as precisely as a full ECU flash. Gains are modest (30–40 hp) and less refined.

Eurocharged Custom Tune

Eurocharged offers remote tuning via email calibration files. Prices start around $800 for a base file. They can customize maps for specific fuel grades and even include a valet mode. However, the installation requires you to own an ECU flashing tool, adding initial expense.

For many owners, the ABT Power Upgrade strikes the best balance: factory backing, no CEL issues, and seamless integration with the car's electronics. It's the safest choice for those who want a hassle-free increase in performance without diving into custom calibration.

Real-World User Experiences

Based on discussions across forums (MBWorld, A45OC, Reddit's r/AMG), ABT Power Upgrade users consistently highlight the following:

  • Throttle response: "The engine feels eager to rev from 2,000 rpm; the old hesitation is gone."
  • Mid-range punch: "Pulling onto the highway, you no longer need to downshift—the car just surges."
  • Fuel economy: Some owners note a 1–2 mpg improvement on highway cruising because the engine reaches peak torque earlier and thus uses less boost to maintain speed.
  • Dyno satisfaction: "My A45 put down 392 whp on 93 octane—exactly what ABT claimed."
  • Customer service: ABT dealers are generally responsive, but support can be limited in regions without an official distributor.

One common criticism: the cost is higher than some mail-order flashes. Many owners feel that the peace of mind (warranty retention, OEM-quality maps) justifies the premium. If you are handy with computers and willing to take a risk, the cheaper options may suffice. But for a new-car-warranty-friendly upgrade, ABT remains the benchmark.

Conclusion and Final Thoughts

The ABT Power Upgrade transforms the M133 engine from a lively hot hatch powerplant into a formidable performance unit that rivals older V8s in real-world responsiveness. The cost ($1,800–$2,700 installed) is in line with other premium ECU tunes, and the performance gains—40 horsepower and 50 Nm of torque—are tangible behind the wheel. More importantly, the upgrade respects the engine's mechanical limits and retains the factory's characteristic refinement.

Before pulling the trigger, check your warranty and insurance terms, confirm the dealer is ABT certified, and budget for a fresh oil change. If you want a proven, worry-free path to more power, the ABT Power Upgrade is one of the smartest investments you can make for an A45, CLA45, or GLA45. For those who crave even more, the ABT system serves as an ideal foundation for future upgrades like a larger intercooler or high-flow downpipe, should your appetite for speed continue to grow.