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Why Upgrade the M133 Engine with a VF Engineering Supercharger?

The M133 engine, found in performance models like the Mercedes-Benz A45 AMG, CLA45 AMG, and GLA45 AMG, is already a potent 2.0-liter turbocharged four-cylinder. However, enthusiasts seeking higher power output often turn to forced induction upgrades. The VF Engineering Supercharger Kit for the M133 replaces the factory turbocharger with a positive-displacement supercharger, delivering instant throttle response and massive low-end torque. This guide provides a comprehensive walkthrough for a successful installation, covering everything from preparation to post-installation tuning.

Before starting, ensure you have the correct VF Engineering kit specifically designed for the M133. This kit typically includes the supercharger unit, mounting brackets, intercooler system, fuel system upgrades, and a pre-loaded ECU tune. If you are unsure about compatibility, consult the VF Engineering official website for vehicle fitment details. Always wear safety glasses and gloves during the installation.

Required Tools, Materials, and Safety Gear

Having everything on hand before you begin prevents delays. Below is a detailed list of what you will need.

Tools

  • Socket and ratchet set – metric sizes from 8mm to 19mm, including extensions and a universal joint
  • Torque wrench – capable of reading in Nm and lb-ft (5–200 Nm range recommended)
  • Combination wrenches – metric 10mm, 13mm, 15mm, 17mm, 19mm
  • Screwdrivers – flathead and Phillips head (various sizes)
  • Hex (Allen) key set – metric, for removing pulleys and brackets
  • Pliers – slip-joint and needle-nose
  • Hose clamp pliers – for spring-style clamps
  • Pry bar or trim removal tool – for disconnecting plastic clips
  • Vacuum cleaner or compressed air – to clean area before disassembly
  • Flush cutters or wire strippers – for any electrical modifications (rarely needed)

Materials

  • VF Engineering Supercharger Kit – includes all necessary components (supercharger unit, brackets, pulleys, belt, intercooler, hoses, ECU flash)
  • Coolant – OEM Mercedes-Benz approved or equivalent phosphate-free ethylene glycol mixture (pre-mixed 50/50)
  • Engine oil – 0W-40 or 5W-40 synthetic (check your owner’s manual)
  • Thread-locking compound – medium strength (Loctite 243) for critical fasteners
  • Anti-seize compound – for exhaust and stainless steel bolts
  • Shop towels and degreaser – to keep work area clean
  • Disposable gloves and safety glasses
  • Zip ties and electrical tape – for securing loose wires or hoses
  • OEM replacement gaskets and seals – for throttle body, intake manifold, and coolant lines
  • New spark plugs – gap to 0.024–0.026 inches (often required with increased boost)
  • Diagnostic scan tool – to reset adaptions and check for error codes

Preparation: Setting Up Your Garage and Vehicle

Proper preparation avoids complications later. Follow these steps in order.

Step 1: Position the Vehicle

Park the car on a level concrete floor. Engage the parking brake and chock the rear wheels. If you have a hydraulic lift, raise the vehicle to a comfortable working height. Otherwise, use sturdy jack stands placed at the four jack points. Never rely solely on a jack.

Step 2: Disconnect the Battery

Open the trunk or engine compartment battery terminal. Disconnect the negative (-) terminal first, then the positive (+). Wait at least five minutes for the electrical system to fully discharge before touching any sensors or engine control units. This prevents short circuits and accidental airbag deployment.

Step 4: Remove Obstructions

Take off the engine covers (if any) and set aside. Remove the air intake duct and air filter housing. If your car has a sound generator or other attached components, photograph them for reference. Next, remove the front bumper cover and headlight assemblies if required for access to the intercooler system. Check the VF Engineering instructions for specific panel removal guidance.

Removing the Factory Turbocharger System

The M133’s factory turbocharger sits on the exhaust manifold side. Removing it requires patience and care.

Step 1: Disconnect the Charge Air Cooler Pipes

Loosen the hose clamps securing the charge air pipes to the turbo compressor outlet and intercooler. Slide the pipes off and remove the intercooler itself (usually held by four bolts at the front). Set aside.

Step 2: Unbolt the Turbo from the Exhaust

Locate the bolts attaching the turbo to the exhaust manifold and downpipe. Spray with penetrating oil if they are rusted. Use a 13mm socket and an extension to reach the lower bolts. Keep track of the gaskets—replace if damaged.

Step 3: Detach Oil and Coolant Lines

The turbo has oil feed and return lines, plus coolant supply and return lines. Use wrenches to disconnect them. Have a small container ready for residual fluid. Plug the lines immediately with clean rags or rubber caps to keep debris out.

Step 4: Remove the Turbo Assembly

With everything disconnected, lift the turbo out from above or below depending on access. It helps to remove the intake manifold (4 bolts) for extra clearance. Place the turbo on a clean workbench. Inspect the turbo inlet for any oil residue that might indicate crankcase pressure issues—address before installing the supercharger.

Installing the VF Engineering Supercharger

Now that the engine bay is empty, you can mount the supercharger.

Step 1: Install the Supercharger Bracket

The VF kit includes a custom bracket that mounts to the engine block where the turbo used to sit. Use the provided bolts and apply thread-locking compound. Torque to the values specified in the VF manual (typically 25 Nm for M10 bolts). Ensure the bracket sits flush.

Step 2: Position the Supercharger Unit

Lift the supercharger (with intercooler core if integrated) onto the bracket. Align the pulley with the crankshaft pulley. Slide the supplied belt over the pulleys. Do not tension yet. Check for any interference with the alternator, power steering pump, or engine mounts. Reposition as necessary.

Step 3: Secure the Supercharger

Bolt the supercharger to the bracket using the included hardware. Tighten in a crisscross pattern to avoid warping the mounting flange. Torque to specification (often 20 Nm for M8 bolts).

Step 4: Connect the Throttle Body and Intake

The VF kit relocates the throttle body to the front of the supercharger. Attach the throttle body using a new gasket. Connect the factory electrical connector (you may need to extend or reroute the wiring harness – see kit instructions). Install the air filter and intake duct that come with the kit.

Step 5: Attach the Intercooler and Charge Pipes

VF Engineering may include a larger air-to-water intercooler. Install the intercooler core in the front bumper area, connecting it to the supercharger outlet with silicone hoses and T-bolt clamps. Ensure all connections are tight. For air-to-air systems, mount the intercooler behind the front bumper.

Connecting the Cooling System

Proper cooling is critical for supercharger longevity. The VF kit requires coolant circulation.

Step 1: Route Coolant Lines

Locate the two coolant ports on the supercharger unit. Attach the supplied hoses to the heater core return line or a dedicated coolant loop. Use new OEM-style spring clamps or screw-type clamps. Route hoses away from moving parts and high-heat sources like the exhaust manifold.

Step 2: Bleed the Cooling System

Fill the cooling system with the recommended coolant mixture until it flows from the bleed screw. With the cap open, start the engine (do not run long without proper cooling). Let it idle while you watch for air bubbles. Close the bleed screw when a steady stream of coolant appears. Top off the reservoir. For a complete guide, see Mercedes-Benz forum discussions on coolant bleeding.

Step 3: Check for Leaks

Inspect all hose connections visually. Gently squeeze the hoses to feel for any seepage. If you find a leak, tighten the clamp or reposition the hose.

Additional System Considerations: Fuel, Tuning, and Belts

Installing a supercharger changes the engine’s fuel and ignition demands. The VF kit usually includes a handheld tuner or ECU flash. Follow these extra steps.

Fuel System Upgrades

If your kit includes larger fuel injectors or a higher-flow fuel pump, remove the old injectors and install the new ones with new seals. For the pump, access is under the rear seat (passenger side). Disconnect the fuel pump module and swap in the upgraded unit. Prime the system by cycling the ignition key on and off without starting the engine for three cycles.

ECU Tuning

Most VF kits provide a pre-loaded tune that works with stock boost levels. Connect the provided tuning device to the OBD-II port and follow the on-screen prompts to flash the ECU. Do not start the engine until the flashing process completes. If you have additional modifications (catted downpipes, intake, exhaust), consider a custom tune from a reputable shop. Read more about M133 tuning requirements on RENNtech’s technical articles.

Belt Tension and Alignment

Check belt tension. There should be about ½ inch of deflection on the longest span. Use a belt tension gauge if available (specs usually around 80–100 lbs for a serpentine belt). Ensure the belt is riding properly on all pulleys. Misalignment can cause squealing or premature wear.

Final Steps and Post-Installation Testing

After everything is assembled, perform these checks before driving.

Step 1: Reconnect the Battery and Check for Codes

Reconnect the battery positive first, then negative. Turn the ignition key to the ON position without starting the engine. Check with a scan tool for any fault codes related to sensors that may have been unplugged. Clear those codes. Check fuel pressure if possible.

Step 2: First Start and Idle Check

Start the engine and listen for any abnormal noises – whines, rattles, or hisses. A brief noise from the supercharger gears is normal at first. Let the engine idle, and watch the oil pressure gauge. Allow the coolant temperature to reach normal operating range (around 90°C / 194°F). Verify the supercharger oil level (if equipped with a separate reservoir).

Step 3: Leak Test

With the engine off, pressurize the charge air system (if you have a smoke machine) or inspect all couplers and hoses for boost leaks. A soapy water spray on connections can reveal small leaks at idle – look for bubbles. Tighten clamps as needed.

Step 4: Test Drive and Data Logging

Take the car for a gentle drive first. Gradually increase load. Monitor boost pressure on a gauge or data logger. Boost should reach the target specified by VF (usually around 10–12 psi peak). Listen for any hesitations or surging. If the car goes into limp mode, stop and diagnose using the scanner. Verify that the intercooler temperature remains reasonable after repeated pulls.

Conclusion: Enjoying Your Upgraded M133

Completing the VF Engineering Supercharger installation transforms your M133-powered vehicle into a thrilling machine with immediate throttle response and significantly increased power. The key to a reliable build is following torque specs, using quality fluids, and ensuring the ECU tune matches your setup. If you encounter any difficulty, consult professional installers or the VF Engineering support page. After a break-in period of 500 miles, change the oil and inspect all hardware a final time. With proper maintenance, your supercharged M133 will provide years of exhilarating performance.