Description
Unlock the full potential of your BMW S55-powered vehicle with the RK-Tunes Performance Tune. Developed on a Dynojet chassis dyno and validated through extensive real-world testing, our S55 calibrations deliver impressive power gains while maintaining drivability, reliability, and consistency.
Whether you're running a lightly modified street car or building a high-horsepower race machine, RK-Tunes offers proven tuning solutions capable of supporting power levels from 520 WHP all the way beyond 1,000 WHP.
Starting from a stock baseline of approximately 440 wheel horsepower, our custom tuning strategy optimizes boost control, ignition timing, fueling, and throttle mapping to maximize performance throughout the entire powerband.
Power Levels & Recommended Modifications
Stage 1 – 520 WHP (+80 WHP)
Recommended Supporting Modifications:
- RK-Tunes Front Mount Intake
- High-Flow Catted Downpipes
- RK-Tunes Custom Tune
- MHD Super License
- MHD Wireless Flash Adapter
- NGK 97506 Spark Plugs
- RK-Tunes High-Output Ignition Coil Packs
- RK-Tunes Charge Pipe
- RK-Tunes Crank Hub Upgrade
Stage 2 – 600 WHP (+160 WHP)
Additional Supporting Modifications:
- Flex Fuel System
- MHD Flex Fuel Kit
Stage 3 – 700 WHP (+260 WHP)
Additional Supporting Modifications:
- RK-Tunes Upgraded Twin Turbos
- RK-Tunes Low-Pressure Fuel Pump
Stage 4 – 800 WHP (+360 WHP)
Additional Supporting Modifications:
- Upgraded Charge Cooler System
Stage 5 – 1000+ WHP (+560+ WHP)
Additional Supporting Modifications:
- Fully Built Engine
- Multi-Pump Low-Pressure Fuel System
- Upgraded DCT Clutches or Performance Manual Clutch
S55 Maintenance & Reliability Recommendations
To ensure maximum performance and reliability, RK-Tunes recommends the following service intervals:
- NGK 97506 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 optimal performance
- Upgraded charge pipes to replace failure-prone factory units
- Clutch upgrades for higher horsepower manual transmission vehicles
- Port injection recommended for high-horsepower applications
Recommended Spark Plug Gap Settings
| Power Level | Spark Plug Gap |
|---|---|
| Up to 550 WHP | 0.025" |
| 551–700 WHP | 0.022" |
| 701–850 WHP | 0.020" |
| 851–1000 WHP | 0.018" |
| 1000+ WHP | 0.016" |
Why Choose RK-Tunes?
- Dyno-developed and street-tested calibrations
- Proven performance gains across multiple power levels
- Smooth drivability and consistent power delivery
- Flex fuel compatibility
- Support for stock and upgraded turbocharger setups
- Designed for reliability as well as performance
- No methanol injection required
Fitment
- BMW F80 M3 (2015-2018)
- BMW F82 M4 Coupe (2015-2020)
- BMW F83 M4 Convertible (2015-2020)
- BMW F87 M2 Competition (2019-2021)
