Advanced SIMOS 18 Direct-Injection Remapping Strategy

In this WinOLS remap training, we calibrate the Siemens SIMOS 18 ECU used in the Audi S1 turbo petrol engine.

SIMOS 18 is a torque-based DI ECU where torque request determines boost, air mass, fuel, ignition timing, and camshaft control. Professional tuning requires coordinated modification of all these systems.

All remapping follows Schiller Tuning calculation-based methodology derived from extensive SIMOS 18 VAG tuning projects.

Torque Model & Driver Demand Remapping

Maps Explained

• Driver Wish
• Maximum Engine Torque
• Torque Limiter
• Gear Torque Limit
• Torque Monitoring

Units & Axes

• X-axis: RPM
• Y-axis: Pedal / Load
• Values: Nm

Remapping Method

Torque targets are increased progressively across RPM. All limiters and monitoring thresholds are aligned to prevent torque intervention.

Safe Change Range

+10% to +25%

Effects

✔ Stronger acceleration
✔ Higher boost request
✔ Faster throttle response

Risks

✖ Torque intervention
✖ Gearbox overload
✖ Limp mode

Boost & Air Load Control Remapping

Maps Explained

• Load Request
• Boost Target Pressure
• Boost Limiters
• Wastegate Duty Cycle
• Turbo Protection

Units & Axes

• Pressure: mbar absolute
• Load: % or mg/stroke
• Axes: RPM vs Load

Remapping Method

Boost is raised according to torque increase and turbo efficiency range. Wastegate maps are recalibrated to stabilize boost control.

Safe Change Range

+120 to +250 mbar

Effects

✔ Higher cylinder filling
✔ Increased torque
✔ Faster turbo spool

Risks

✖ Turbo overspeed
✖ Overboost faults
✖ High EGT

Direct Injection Fuel & Lambda Calibration

Maps Explained

• Lambda Target
• Full Load Lambda
• Fuel Base Map
• Component Protection Lambda
• Injection Quantity

Units & Axes

• Lambda (λ)
• Fuel: mg/stroke
• Axes: RPM vs Load

Remapping Method

Full-load lambda is enriched under boost to control temperature and knock. Fuel quantity is recalculated from airflow increase.

Safe Range

λ 0.78–0.85 under boost

Effects

✔ Knock safety
✔ Cooler combustion
✔ Turbo protection

Risks

✖ High fuel consumption
✖ Catalyst stress

Rail Pressure & Injection Timing Remapping

Maps Explained

• Rail Pressure Target
• Rail Pressure Limit
• Injection Timing (SOI)
• Injection Window
• DI Correction

Units & Axes

• Pressure: bar
• Timing: °CA
• Axes: RPM vs Load

Remapping Method

Rail pressure is slightly increased to support higher fuel mass. Injection timing is optimized for combustion efficiency.

Safe Change

+5–10% pressure

Effects

✔ Better atomization
✔ Stable DI combustion
✔ Higher fuel delivery

Risks

✖ HPFP stress
✖ Injector wear

Ignition Advance Optimization

Maps Explained

• Base Ignition
• Full Load Ignition
• Knock Correction
• IAT Ignition
• EGT Retard

Units & Axes

• Degrees BTDC
• Axes: RPM vs Load

Remapping Method

Ignition is advanced where knock margin exists due to richer mixture and improved charge cooling.

Safe Range

+1–3°

Effects

✔ Higher torque
✔ Faster combustion
✔ Efficiency gain

Risks

✖ Knock
✖ Piston damage

Camshaft Timing (VVT) Optimization

Maps Explained

• Intake Cam Advance
• Exhaust Cam Timing
• VVT Torque Optimization

Units & Axes

• Crank angle degrees
• RPM vs Load

Remapping Method

Cam timing is adjusted to improve cylinder filling and turbo response in tuned torque zones.

Effects

✔ Improved midrange torque
✔ Better spool
✔ Combustion efficiency

Torque Monitoring Alignment

SIMOS 18 torque monitoring maps are recalculated so ECU torque model matches new tuned torque output, preventing intervention or faults.

Schiller Tuning SIMOS 18 Method

All Audi S1 SIMOS 18 remapping in this WinOLS tutorial follows Schiller Tuning principles:

• Torque-based calibration
• DI combustion safety
• Turbo efficiency limits
• Structured map alignment
• Proven VAG tuning data

Professional Training & Support

This SIMOS 18 WinOLS course includes:

• Audi S1 remap strategy
• SIMOS 18 map packs
• Tuning guide
• Online support

Schiller Tuning provides reliable and professional ECU remap training.