What this table does
The Anti-lag Ignition Advance/Retard table changes ignition timing whenever the Anti-Lag function is active. In practice it's almost always used to pull a lot of timing out.
Why heavy retard works
Anti-lag lets enough air through the engine to keep exhaust flow up, even with your foot off the pedal. If that air and fuel burned at normal timing, the engine would make torque and the revs would climb. Retarding the spark hard means the charge is still burning late as the exhaust valve opens. Very little of that energy pushes on the piston, so engine speed stays put, but a lot of it leaves as heat and pressure in the exhaust. That keeps the turbine spinning fast, so boost is there the moment you get back on the throttle.
How we approach it
- Start with modest retard and add it in steps, watching RPM, boost and exhaust temperature in your logs.
- Pair it with anti-lag enrichment, since fueling and timing work together here.
- Remember the cost. Heavy retard sends extreme heat into the manifold, turbo and exhaust, so use anti-lag only where it's needed and keep an eye on temperatures.
Anti-lag is hard on hardware. Check your turbo and exhaust are up to it, and make sure the arming switch wiring is solid so it can't turn on by accident.
