Unlocking the potential of your B58 with the Falcon Turbos BMW B58 Supercore bolt on upgrade
BMW’s B58 3.0-litre straight-six has rightfully earned its status as the modern benchmark for inline-six performance. Found across the M140i, M240i, 340i, 440i, 540i, and the Toyota GR Supra, it pairs a closed-deck block and forged steel crankshaft capable of handling serious power straight out of the box.
While basic Stage 1 and Stage 2 calibrations wake these engines up, owners pushing past 450 bhp invariably run into a hard mechanical wall: the stock turbocharger suffocates.
Pushing the factory unit beyond 21–23 PSI forces the compressor out of its efficiency window, turning the turbo into a thermal bottleneck that traps extreme exhaust backpressure, spikes intake air temperatures, and causes the ECU to pull timing.
To shatter that bottleneck without the expense, lag, and custom fabrication of a big-frame turbo swap, we have engineered the Falcon Turbos BMW B58 Supercore—a precision drop-in core that unlocks true Stage 3 performance.
What Is the Falcon Turbos B58 Supercore?
On the B58 engine, the factory turbo features an integrated manifold and turbine housing cast as a single unit. Rather than requiring you to discard your factory setup and invest thousands in bespoke tubular manifolds, external wastegates, and modified downpipes, the Falcon Supercore is a complete Centre Housing Rotating Assembly (CHRA) that replaces the heart of your turbo.
It bolts directly into your existing housings and plumbing, preserving the OEM footprint while packing motorsport-grade internals:
- Direct Fitment: Retains your original electronic wastegate (EWG), factory oil and coolant lines, chargepipe orientation, and downpipe connection.
- Factory “OEM+” Stealth: Looks stock from the outside while eliminating the fabrication headaches and heat clearance issues common to big-frame top-mount swaps.
- Plug-and-Play Installation: Drastically cuts down workshop labour hours compared to a full-frame conversion.
Check out the full product specifications and order your BMW B58 Supercore from Falcon Turbos, or contact our Sheffield engineering workshop directly for fitment advice and custom build requirements.
Engineered Inside: Proprietary Falcon Hardware
Founded in Sheffield in 2016, Falcon Turbo Developments Ltd builds units engineered to outperform OEM specifications. Inside the B58 Supercore, every critical wear surface and aerodynamic profile has been re-engineered:
1. Lightweight CNC-Machined Billet Compressor Wheel
Milled from a solid block of aircraft-grade forged aluminium, our oversized billet wheel features aggressive, thin-blade profiles and extended-tip technology. Despite its larger diameter, the reduced mass lowers rotational inertia, delivering lightning-fast transient response between gear shifts while drawing in significantly higher air mass at lower intake temperatures.
2. High-Flow Inconel Turbine Shaft
To eliminate the severe backpressure trapped behind the cylinder head at high RPM, our supercore incorporates an enlarged, high-flow turbine wheel cast from aerospace-grade Inconel superalloy. Enriched with titanium, aluminium, molybdenum and niobium, Inconel maintains its structural integrity and creep resistance past 1000°C, allowing your B58 to exhale freely and pull cleanly to the 7,000 RPM redline.
3. Heavy-Duty 360-Degree Thrust Bearing System
Factory B58 units rely on standard 270-degree thrust bearings with an open lubrication gap—a vulnerable design prone to metal-on-metal contact and shaft play under elevated boost. The Falcon Supercore features our proprietary 360-degree thrust bearing configuration. Featuring precision-machined oil channels, it provides an unbroken hydrodynamic oil wedge around the shaft, absorbing high axial loads under hard acceleration and track-day use.
4. Multi-Stage High-Speed Dynamic VSR Balancing
Every Falcon Supercore is dynamically balanced on our in-house CIMAT Turbo Test Duo Expert Vibration Sorting Rig (VSR). Driven by compressed air up to operational speeds exceeding 200,000 RPM with hot, pressurised oil flowing through the core, our technicians calibrate the rotating assembly down to tolerances tighter than OEM. This eliminates harmonic resonance, stops the dreaded “police siren” whistle, protects the bronze journal bearings and piston ring seals, and guarantees long-term durability.
Real-World Performance & Output
| Metric | Factory B58 Turbo | Falcon B58 Supercore Upgrade |
|---|---|---|
| Peak Power Output | ~420–450 bhp (choked at high RPM) | 500 + bhp (fuelling & octane dependent) |
| Boost Efficiency | Loses breath beyond ~22 PSI | Efficient, cool delivery up to 30+ PSI |
| Top-End Pull | Power tapers off sharply past 5,500 RPM | Relentless torque hold right to 7,000 RPM |
| Transient Response | Fast spool, restricted flow | Near-instant punch with zero big-turbo lag dead zones |
| Installation | Factory stock | Direct drop-in replacement using stock lines & EWG |
Supporting Modifications for Optimum Results
To extract the maximum potential from your Falcon Turbos Supercore while protecting your drivetrain, we recommend pairing the installation with:
- High-Pressure Fuel Pump (HPFP): Gen 1 B58 cars (F20 M140i, F30 340i) run out of pump flow at around 450–470 bhp. A direct-fit B58TU pump or Dorch Stage 2 unit supplies the required fuelling overhead.
- Free-Flowing Downpipe: A 4-inch or 4.5-inch high-flow sports cat or decat downpipe relieves exhaust backpressure and drops exhaust gas temperatures.
- Aluminium Chargepipe: Replaces the brittle factory plastic pipe to prevent boost leaks and blow-offs under higher pressures.
- Cooling Upgrades: An uprated front-mount heat exchanger keeps charge temperatures stable across back-to-back pulls.
- Transmission Calibration (TCU Flash): An xHP Stage 3 flash raises the factory torque limiters on the ZF 8-speed automatic box and increases clutch clamping pressure to handle the torque surge.
- Stage 3 Engine Remap: Bespoke ECU calibration or Bootmod3 / MHD tailored to 99 RON or ethanol-blend fuel. Check out our list of trusted tuners.
Ready to Build Your B58?
Stop choking your B58 with a turbo that acts like a heat pump at high RPM. The Falcon Turbos B58 Supercore gives you the flow and high-boost reliability needed for 500+ bhp performance without altering your car’s factory manners or engine bay aesthetics. To achieve higher power, 600+ bhp why not take a look at our B58 hybrid turbo.
