Subscribe to a magazine

Gm Map

Back to article View Gallery
11 of 13
Like the fuel map the base ignition tables are very easy to use. The system uses a GM map sensor and RPM as the axis points. The lower left corner would be high vacuum and low RPM. As the engine RPM and load increase the systems reads cells in the middle to upper right area of the map. Generally at idle with 10 inches of vacuum the referenced cell is near the middle of map.

Advertisement