Legend Tuned · ECU Software
MotorcycleHarley-Davidson CVO Street Glide / Road Glide / ST (2023–) Milwaukee-Eight 121 VVT 115 HP ECU Software & Chip Tuning
- 2023–present
- Petrol
- 115 HP · 189 Nm
Target with Legend Tuned Stage 1: 123 HP / 200 Nm; with Stage 2: 130 HP / 208 Nm. The original software is backed up, the calibration is tailored to the car, and the result is verified by datalog.
Legend Tuned figures
Figures are examples/estimates and may vary with the car's mileage, maintenance condition, fuel quality and hardware. Exact results are determined by dyno/datalog.
Power & torque curve
Stock vs Stage comparison
A representative power and torque curve with a technical table of all figures. Hover over the chart to see values by rpm.
- Power · Stage 1
- Torque · Stage 1
- Power · Stock
- Torque · Stock
Technical figures
| Value | Stock | Stage 1 | Stage 2 |
|---|---|---|---|
| Power | 115 HP | 123 HP | 130 HP |
| Power (kW) | 85 kW | 90 kW | 96 kW |
| Torque | 189 Nm | 200 Nm | 208 Nm |
| Power gain | — | +8 HP (+7%) | +15 HP (+13%) |
| Torque gain | — | +11 Nm (+6%) | +19 Nm (+10%) |
Figures are examples/estimates and may vary with the car's mileage, maintenance condition, fuel quality and hardware. Exact results are determined by dyno/datalog.
Custom software · 7 options
Custom software options for this engine
Legend Tuned functions suitable for this engine, which can be applied in the same session as Stage software or on their own.
Motorcycle & ATV/UTV Software
On a motorcycle, ATV or UTV — this power is SENDE!!! too
Emission Systems
Emission system solutions for track and motorsport projects.
- Catalytic Converter Delete (Cat Off) ECU software that prevents the check-engine light and power loss on cars with a removed or replaced catalytic converter.
- Rear Lambda/O2 Sensor Delete Software that turns off monitoring of the post-cat (rear) oxygen sensor to prevent the check-engine light on downpipe and sports cat setups.
Legal notice: Software for emission systems (catalytic converter, DPF/FAP, OPF, EGR, AdBlue/SCR, etc.) is intended solely for track / motorsport and closed-course use. Driving vehicles with these systems disabled on public roads, and presenting them for TÜVTÜRK inspection, may be against regulations. On request, the original software can be restored.
Driving & Sound Effects
Make yourself heard and be first off the line.
- Pops & Bangs (Crackle Map) Popular The signature pops and crackles from the exhaust when you lift off the throttle — intensity set to your taste.
- Rev Limiter Adjustment Software that re-sets the engine's maximum rev limit while staying within mechanical limits.
- Cold Start Idle Delete A software adjustment that reduces the high, noisy idle speed on a cold start.
Fault & Function Solutions
Permanent software fixes for annoying faults.
Stage 2 hardware, peace of mind and process
Stage 2 requirements
Stage 2 ready with exhaust and air filter
At Stage 2, the engine's breathing is freed up with hardware: the exhaust and air filter are upgraded, and the software is written to match that hardware. The target for this engine is 130 HP / 208 Nm.
- Exhaust systemA slip-on or full exhaust system; the software is written for the exhaust fitted.
- Air filterA high-flow sport air filter; the airbox inlet is modified if needed.
- Datalog & fine-tuningAir/fuel ratio and ignition are logged during a road or off-road test; fine-tuning is done if needed.
- Health checkIgnition, fuel system, clutch / CVT belt and cooling checked for this power level; the job takes ~4–8 hours (depending on parts fitted).
Included every time
Power with peace of mind
- Original software backup — the factory software is read and archived before the job.
- Reversal — the car can be returned to its original software whenever you ask.
- Datalog check — ignition, air/fuel ratio and engine temperature are recorded and checked during a road or off-road test.
- Vehicle-specific calibration — not an off-the-shelf file; tuned to the engine, hardware and fuel quality.
- Pre-tune diagnostics — fault memory is read and engine health is checked before the software.
-
Book
Tell us about your car and your goals; we'll plan the day and time together.
-
Analysis & backup
Fault memory is read, the ECU is identified and the original software is archived.
-
Legend Tuned software
Calibration tailored to the car (Stage 1: ~1–2 hours).
-
Test & handover
Verified with a road test + datalog, then handed over with a walkthrough of what was done.
Harley-Davidson CVO Street Glide / Road Glide / ST (2023–)
Other engines in the same generation
Other CVO generations
Vehicle Selector