Stationary Launch
Hold the vehicle at a configured launch RPM while Anti-Lag builds boost before release.
MG Flasher Custom Code FeatureAnti-Lag
Anti-Lag
Launch Control
Build boost before a stationary or rolling launch with configurable MG Flasher Anti-Lag. Supported setups can use steering-wheel controls, in-app settings and multiple safety limits to shape how the feature responds without reflashing the vehicle for every adjustment.
New to MG Flasher? How It Works
2
Launch Modes
1,500–6,000
Standing RPM Control
B58
Official Platform Support
Anti-Lag Status
Standing Mode Ready
Armed
1.5
3
4.5
6
Launch RPM
3500RPM
Standing Anti-Lag setpoint
3500 RPM
Fuel Cut selected
Available from Custom Code v6.9.1. Designed to reduce stress compared with Ignition Cut and does not create flame effects.
01
Hold the rocker
02
Apply throttle
03
Release to launch
Interactive explanation only. Actual availability and settings depend on the installed vehicle, ECU software, Custom Code and calibration.
Build Boost Before the LaunchSharper Response.
Sharper Response.
Two Driving Scenarios.
Anti-Lag temporarily changes engine control behaviour to build intake and exhaust pressure before acceleration. MG Flasher supports both stationary and rolling use cases on compatible configurations, with simple and expert settings available for tuning activation, boost response and safety limits.
Anti-Lag intentionally increases thermal and mechanical load. It should be configured by a knowledgeable tuner, used infrequently and operated only where local law and the vehicle environment allow it.
Rolling Launch
Build boost at a selected rolling speed and gear, then release the control to accelerate.
App Adjustability
Compatible Custom Code exposes simple and expert settings for launch behaviour and protection limits.
Safety Shutdowns
Temperature, boost and duration limits can stop an Anti-Lag event when configured boundaries are exceeded.
Two Launch ModesStationary or Rolling.
Stationary or Rolling.
Choose the Scenario.
The two modes share the same core objective—building boost before acceleration—but differ in how the vehicle is moving and how the launch point is defined.
01
Vehicle stopped
Stationary Anti-Lag
Hold the rocker, press the throttle and let engine speed rise to the configured standing target. Release the rocker when ready to launch.
- Adjustable standing RPM setpoint
- Target boost and activation settings
- Live Control RPM slider where supported
02
Vehicle moving
Rolling Anti-Lag
Select a suitable gear and RPM window, hold the rocker, apply throttle to build boost and release the rocker to accelerate.
- Works around tuner-defined RPM boundaries
- Activation delay and pedal threshold settings
- Designed for rolling acceleration scenarios
Combustion StrategyFuel Cut or
Fuel Cut or
Ignition Cut.
Compatible Anti-Lag calibrations can use different strategies. Availability depends on the engine platform, Custom Code version and tune.
Recommended where available
Custom Code v6.9.1+Fuel Cut
Fuel Cut was introduced as a lower-stress method compared with Ignition Cut. It can hold RPM and build boost without creating flame effects.
LowerRelative stress
NoFlame effect
v6.9.1+Introduced
B58 platform only
Performance / competition useIgnition Cut
Ignition Cut can create a more aggressive event with significant timing retard, exhaust pressure and possible backfire. It places greater stress on the engine, turbo and exhaust system.
HigherRelative stress
PossibleBackfire / flames
B58Platform restriction
Important:
Anti-Lag intentionally creates additional heat and pressure. Use infrequently, follow the tuner’s configuration and obey all applicable laws and safety requirements.
Activation WorkflowFrom Ready
From Ready
to Launch.
MG Flasher uses the cruise-control rocker and configurable Custom Code settings to control the Anti-Lag event.
Stop the Vehicle
Remain below the configured speed threshold used to identify a stationary launch.
Hold Far Down
Hold the cruise-control rocker in the far-down position until the Check Engine Light blinks quickly.
Apply Throttle
Keep holding the rocker and press the throttle so engine speed rises toward the configured launch RPM.
Release to Launch
Release the rocker when ready. Anti-Lag ends and the vehicle accelerates.
Choose Speed & Gear
Move to the desired rolling speed and select a gear that keeps RPM within the configured operating window.
Hold Far Down
Hold the cruise-control rocker in the far-down position until the Check Engine Light blinks quickly.
Build Boost
Press the throttle beyond the configured activation point while the rocker remains held.
Release to Accelerate
Release the rocker to leave the Anti-Lag event and begin the rolling acceleration.
Live Control & Custom Code MenuAdjust the RPM Live.
Adjust the RPM Live.
Read the CEL Correctly.
On compatible Custom Code, Live Control provides a standing Anti-Lag RPM slider from 1,500 to 6,000 RPM in 100 RPM increments. The same standing setpoint can also be adjusted through the Custom Code Menu on supported vehicles.
In-App ControlStanding Anti-Lag RPM
Standing Anti-Lag RPM
in Live Control
Live Control changes the standing Anti-Lag setpoint directly in the app. Where supported, the slider adjusts the target RPM from 1,500 to 6,000 in 100 RPM increments.
✓MG Flasher app version 483 or later
✓Standing Anti-Lag RPM shown live next to the slider
✓100 RPM step size for supported setups
✓Exact availability depends on Custom Code and calibration
Live Control vs CCM
Explore Live Control →
The app is the clearest way to preview the standing setpoint. In the CCM, the tachometer position at 4K identifies the Anti-Lag submenu, while the CEL explains the state.
Live Control
Standing Anti-Lag RPM
Connected
Standing setpoint
3500RPM
FeatureEnabled
Range1,500–6,000
Control100 RPM steps
Visual demonstration only. Exact controls depend on vehicle support, ECU software, installed Custom Code and calibration strategy.
Custom Code MenuThe OEM Gauge Shows
The OEM Gauge Shows
The Menu Logic
Anti-Lag uses the combined instrument-cluster logic of the OEM tachometer and Check Engine Light. The tachometer shows the root-menu position or a chosen standing RPM value, while the CEL identifies whether you are in the root menu, inside the Anti-Lag submenu or actively using Anti-Lag.
4K
Anti-Lag in the CCM root menu
4× CEL
Counted submenu confirmation
Fast CEL
Anti-Lag actively in use
4K is a menu position
Open Anti-Lag Guide →
The 4K tachometer position identifies the Anti-Lag submenu. It is not automatically the selected standing launch RPM.
OEM instrument-cluster feedback
RPM Gauge + Check Engine Light
CCM logic
Root-menu position
4K
Anti-Lag
Check Engine LightSlow CEL blinks
The slow blink confirms that the CCM root menu is active.
Step 01 · Root menu
Navigate the OEM tachometer to 4K
While the CEL blinks slowly, move through the CCM root menu until the tachometer points to 4K for Anti-Lag.
Do not confuse the signals:
Four counted blinks confirm the submenu. Fast continuous blinking is the separate activity signal shown only while Anti-Lag is actually being used.
Interface demonstration only. Exact button inputs depend on the configured UniRocker or RockerCombo setup. Standing and rolling Anti-Lag availability depends on the Custom Code version, tune strategy, fuel, vehicle state and configured safety logic.
Emergency Shutdown LogicProtection Limits
Protection Limits
End the Event Early.
If a configured safety boundary is exceeded, Anti-Lag can stop, require the driver to release the throttle and temporarily reduce boost pressure until conditions return within range.
Minimum Coolant Temperature
Anti-Lag remains unavailable when the engine is colder than the configured minimum.
Maximum Coolant Temperature
The event stops if coolant temperature exceeds the configured upper boundary.
Maximum EGT
Excessive exhaust-gas temperature before the turbo can trigger a safety shutdown.
Maximum IAT
High intake-air temperature can end the event to limit additional thermal load.
Over-Boost Threshold
The event ends if intake-manifold pressure exceeds the target plus the configured over-boost margin.
Maximum Duration
Compatible versions can stop Anti-Lag when the configured maximum event duration is reached.
When Emergency Mode Activates
Open Support Resources →Boost is relieved and the last shutdown reason can be logged.
MG Flasher can temporarily open the electronic wastegate, reduce performance and expose the “Custom Code: Anti-Lag Shutdown Reason” parameter for troubleshooting.
CompatibilityCheck the Exact
Check the Exact
Vehicle and Software.
Anti-Lag availability depends on the engine platform, ECU software, Custom Code version, selected calibration and enabled codewords.
F- and G-Series B58
MG Flasher documentation lists official Anti-Lag support for compatible F- and G-Series vehicles powered by the B58 engine.
Check exact ECU software in the appB4x Platforms
B46/B48 Anti-Lag support is available only by custom-tuner request according to the current documentation.
Not a general OTS availability claimIgnition Cut
Ignition Cut is available on the B58 platform. It has been removed from B4x OTS maps, while custom-tuner access may differ.
Fuel Cut availability also depends on Custom Code
Before You Use Anti-LagSoftware, Calibration
Software, Calibration
and Vehicle Condition.
Anti-Lag is not a universal toggle. It requires a compatible tune, enabled Custom Code settings and a vehicle operating inside configured safety boundaries.
Compatible ECU Software
The connected ECU must support a Custom Code version that includes Anti-Lag functionality.
Enabled Calibration
Anti-Lag codewords, target settings and safety parameters must be configured in the OTS or custom tune.
Safe Temperatures
Coolant, intake and exhaust temperatures must remain within the configured operating limits.
Healthy Hardware
The engine, turbo, exhaust, ignition and fuel systems should be maintained for the intended performance use.
Diagnostics & LoggingUnderstand Why
Understand Why
an Event Stopped.
Anti-Lag diagnostics are available on compatible Custom Code v7.0 and newer. Users can read or set the stationary RPM, while logging can expose the last Anti-Lag shutdown reason for troubleshooting.
Set Standing RPM
Use the app slider where supported without performing a full reflash.
Read Active Setpoint
Check or set the active stationary Anti-Lag RPM through the diagnostics workflow.
CC_ASR Shutdown Reason
Identify the last temperature, pressure or duration boundary that ended the event.
FAQAnti-Lag
Anti-Lag
FAQ.
Common questions about stationary and rolling Anti-Lag, compatibility, controls and safety.
What is MG Flasher Anti-Lag?
MG Flasher Anti-Lag is a Custom Code feature that can build boost before a stationary or rolling launch by temporarily changing engine-control behaviour on compatible vehicles.
What is the difference between stationary and rolling Anti-Lag?
Stationary mode targets a configured launch RPM while the vehicle is stopped. Rolling mode is activated while the vehicle is moving within tuner-defined speed and RPM conditions.
Which vehicles officially support Anti-Lag?
Current MG Flasher documentation lists official support for compatible F- and G-Series B58 vehicles. Exact availability depends on ECU software, Custom Code and calibration.
Does Anti-Lag support B48 vehicles?
B4x support is listed as available by custom-tuner request only. It should not be assumed to be present in every B48 OTS map or software version.
What is the difference between Fuel Cut and Ignition Cut?
Fuel Cut was introduced as a lower-stress method and does not create flame effects. Ignition Cut is more aggressive, available on B58 and can produce backfire while increasing thermal and mechanical stress.
Can I adjust the Anti-Lag RPM from the app?
Yes, where Live Control and compatible Custom Code are available. The standing setpoint can be adjusted from 1,500 to 6,000 RPM in 100 RPM increments.
Why does the Custom Code Menu show Anti-Lag at 4K RPM?
The 4K position identifies the Anti-Lag submenu in the Custom Code Menu. It is a menu position, not automatically the selected standing launch RPM.
What safety limits can stop Anti-Lag?
Configured minimum or maximum coolant temperature, maximum exhaust-gas temperature, maximum intake-air temperature, over-boost and maximum duration can end the event.
Can Anti-Lag damage the vehicle?
Anti-Lag intentionally adds heat, pressure and mechanical load and may damage the engine, turbo or exhaust if used or configured improperly. Use it infrequently, only on suitable hardware and according to tuner guidance.
How do I check compatibility?
Download MG Flasher, connect the vehicle through a supported ENET method and use the app to check the exact ECU software and available Custom Code support before purchasing or flashing.
Ready to Check Your Vehicle?Use Anti-Lag
Use Anti-Lag
with MG Flasher.
Find your engine, confirm ECU compatibility and work with the correct calibration for your hardware and driving goals.