How to Choose the Right Octane Map for Your Tune
Running the right fuel isn’t just about filling up at the pump it’s the key to getting the best performance from your tune. Modern turbocharged engines, especially those in high-performance BMW, Audi, and Mercedes platforms, respond dramatically to octane levels.
With CarBahn Performance Controllers, switching between 91, 93, and 100 octane maps is easy, seamless, and designed to optimize power and protect your engine.
Why Octane Matters
Octane isn’t about fuel “quality” it’s about resistance to knock. Higher octane fuels can withstand more compression before detonating, which lets the ECU run more timing and boost safely.
91 Octane → Reliable, safe power for everyday use.
93 Octane → More aggressive timing = more horsepower and torque.
100 Octane → Maximum power for track and performance driving.
Running the right octane ensures your engine gets the most from your tune without compromising reliability.
How CarBahn Octane Mapping Works
CarBahn’s tuning platform allows drivers to select the best map for their driving situation. Using the CarBahn app, you can switch between 91, 93, and 100 octane maps in seconds no flashing, no tools, no downtime.
App-Based Map Switching – Control performance from your phone.
VIN-Locked Security – Protects your tune from unauthorized changes.
Fuel-Specific Calibration – Each map is precision-tuned for real-world performance.
Real Performance Gains
The difference between 91 and 100 octane isn’t subtle — it’s felt in every gear.
| Fuel Type | HP Gain* | Torque Gain* | Best Use Case |
|---|---|---|---|
| 91 Octane | +131 HP | +129 lb-ft | Everyday reliability |
| 93 Octane | +160 HP | +150 lb-ft | Spirited driving, mild track |
| 100 Octane | +181 HP | +179 lb-ft | Maximum output, track or roll |
*Figures based on Stage 2 Performance Controller BMW G90 / G99 M5 dyno testing.
This flexible tuning strategy lets drivers adapt power levels to their environment without permanently altering the ECU.
Smart Fueling = Smart Tuning
Never run a lower octane than your current map.
You can always switch to a lower map if higher octane isn’t available.
Higher octane gives you more power and a wider safety margin.
Consistency matters use trusted, high-quality fuel sources.
Shop CarBahn Performance Controllers
When to Use Each Octane Map
Daily Commutes: Stick with 91 for maximum engine longevity and efficiency.
Weekend Drives or Canyon Runs: 93 octane unlocks stronger throttle response and sharper performance.
Track Days or Drag Events: 100 octane unleashes full power while maintaining knock protection and reliability.
Octane Tuning Q&A
Do I need to reflash my ECU to change octane maps?
No. CarBahn’s app allows you to switch maps instantly no laptop, no flashing.
Can I run 91 octane on a 93 map?
No. Always match or exceed the required fuel grade to prevent knock and engine damage.
Does higher octane always mean more power?
Yes but only if your tune is designed for it. CarBahn maps are optimized individually for 91, 93, and 100 octane.
Is 100 octane safe for daily driving?
Yes, but it’s typically more expensive and not necessary for normal driving. It’s best for track or high-demand situations.
Why CarBahn’s Octane Mapping Stands Out
Engineered and tested for BMW, Audi, and Mercedes platforms
Track and dyno-validated gains
OEM safeguards remain fully active
Instant map switching through a secure mobile app
Tuning should be flexible and with CarBahn, it is. Octane mapping lets you get the best of both worlds: everyday comfort and track-ready power at the tap of a button.