This table adds or removes fuel only while launch control is active. It's an 8x8 3D table, normally mapped against rpm and load, and each cell is a percentage correction on top of the normal fuel calculation.
The common use is helping a turbo spool on the line. Richening the mixture as the engine approaches the launch rpm can put more energy into the exhaust, which helps build boost before you release the brake or clutch. How much, if any, depends on the engine, turbo and fuel, so there's no universal number.
How we map it
- Leave every cell at 0% except the area around your actual launch rpm and load. Outside that zone, the engine should fuel exactly as it normally would.
- Start conservative and add enrichment in small steps, watching lambda, exhaust temperature and boost in your logs.
- Remember this stacks with any timing changes in launch ignition. Change one thing at a time so you know what helped.
Watch the exhaust side
Launch strategies put a lot of heat into the turbo and exhaust. Keep launch holds short, and check your logs after every attempt.
Also see launch end rpm and launch control wiring.
