Description
The RK-Tunes B58 Performance Tune is the result of extensive Dynojet development and real-world testing across hundreds of vehicles. Designed for both Gen 1 and Gen 2 B58 engines, our calibrations deliver exceptional horsepower gains, improved throttle response, smoother power delivery, and unmatched drivability.
Whether you're running a stock turbo daily driver or building a 1,000+ WHP drag or roll-racing car, RK-Tunes offers a proven upgrade path for every stage of the B58 platform.
Supported Vehicles
BMW Models
- F22/F23 M240i
- F20/F21 M140i
- F30/F31/F34 340i
- F32/F33/F36 440i
- G30 540i
- G11/G12 740i
- G32 640i Gran Turismo
- X3 M40i
- X4 M40i
- G05 X5 40i
- G29 Z4 M40i
- G20 M340i
- G22 M440i
Toyota Models
- A90 Toyota Supra
- A91 Toyota Supra
B58 Gen 1 Performance Guide (2016–2018)
Stock Output: Approximately 330 WHP
Stage 1 – 440 WHP (+110 WHP)
Recommended Supporting Modifications:
- RK-Tunes Custom Tune
- MHD Super License
- MHD Wireless Flash Adapter
- NGK 94201 Spark Plugs
- RK-Tunes Front Mount Intake
- RK-Tunes High Output Ignition Coil Packs
- RK-Tunes Charge Pipe
Stage 2 – 455 WHP (+125 WHP)
Additional Supporting Modifications:
- High-Flow Catted Downpipe
- 93 Octane Fuel
Stage 3 – 510 WHP (+180 WHP)
Additional Supporting Modifications:
- E30 Fuel Blend
- Flex Fuel Kit
Stage 4 – 650 WHP (+320 WHP)
Additional Supporting Modifications:
- RK-Tunes Dual Ball Bearing Turbo
- Dorch DS2.5 HPFP or Port Injection System
- MOTIV Reflex Controller
- 750cc+ Injectors
- RK-Tunes Low-Pressure Fuel Pump
Stage 5 – 750 WHP (+420 WHP)
Additional Supporting Modifications:
- Stage 1 Transmission Upgrade
- Upgraded Manual Clutch
Stage 6 – 850–900 WHP (+520–570 WHP)
Additional Supporting Modifications:
- Full Frame 6466 Turbocharger
- Upgraded Charge Air Cooler
- Upgraded Intake Manifold
- Stage 2 Transmission or Better
Stage 7 – 950–1100+ WHP (+620–770 WHP)
Additional Supporting Modifications:
- 68–70mm+ Full Frame Turbo
- Fully Built Engine
- Multi-Pump Low Pressure Fuel System
B58 Gen 2 Performance Guide (2019+)
Stock Output: Approximately 340 WHP
Stage 1 – 440 WHP (+100 WHP)
Recommended Supporting Modifications:
- RK-Tunes Custom Tune
- MHD Super License
- MHD Wireless Flash Adapter
- NGK 94201 Spark Plugs
- RK-Tunes Front Mount Intake
- RK-Tunes High Output Ignition Coil Packs
- RK-Tunes Charge Pipe
Stage 2 – 455 WHP (+115 WHP)
Additional Supporting Modifications:
- High-Flow Catted Downpipe
- 93 Octane Fuel
Stage 3 – 510 WHP (+170 WHP)
Additional Supporting Modifications:
- E30 Fuel Blend
- Flex Fuel Kit
Stage 4 – 650 WHP (+310 WHP)
Additional Supporting Modifications:
- RK-Tunes Dual Ball Bearing Turbo
- Port Injection System
- MOTIV Reflex Controller
- 750cc+ Injectors
- RK-Tunes Low-Pressure Fuel Pump
Stage 5 – 750 WHP (+410 WHP)
Additional Supporting Modifications:
- Stage 1 Transmission Upgrade
- Upgraded Manual Clutch
Stage 6 – 850–900 WHP (+510–560 WHP)
Additional Supporting Modifications:
- Full Frame 6466 Turbocharger
- Upgraded Charge Air Cooler
- Upgraded Intake Manifold
- Stage 2 Transmission or Better
Stage 7 – 950–1100+ WHP (+610–760 WHP)
Additional Supporting Modifications:
- 68–70mm+ Full Frame Turbo
- Fully Built Engine
- Multi-Pump Low Pressure Fuel System
B58 Maintenance & Reliability Recommendations
To maintain peak performance and engine reliability, RK-Tunes recommends:
- NGK 94201 spark plugs every 10,000 miles
- Ignition coils every 50,000 miles
- New factory direct injectors every 70,000 miles
- High-flow catted downpipes for improved performance
- Upgraded charge pipes to replace failure-prone factory units
- Upgraded clutch for manual transmission vehicles at higher power levels
- Port injection for high-horsepower applications
- Quality ethanol content monitoring when running E blends
Recommended Spark Plug Gap Settings
| Power Level | Gap |
|---|---|
| Up to 550 WHP | .030" |
| 551–700 WHP | .025" |
| 701–850 WHP | .022" |
| 851–1000 WHP | .018" |
| 1000+ WHP | .016" |
Why Choose RK-Tunes?
- Dyno-developed and extensively street tested
- Proven results from stock turbo to 1,000+ WHP builds
- Smooth drivability and factory-like operation
- Flex fuel compatibility
- Support for stock and upgraded turbocharger systems
- Reliable tuning strategies focused on long-term performance
- No methanol injection required
