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8 FuelTech base map
the next step is to generate the FuelTech base map, a function that
generates fuel and ignition maps to be used as a start point for the engine tuning.
FuelTech base map is a function that calculates fuel and ignition maps based on the information you provide on
Make sure the information provided is correct and coherent. Maximum RPM and boost values must be
programmed according to the engine capacities, fuel injectors must be correctly scaled to the engine power, etc.
FuelTech standard map also requires the fuel pressure regulator to be a fixed default of 1:1, 1 pound of boost to
1 pound of fuel pressure.
It is very important to use any kind of equipment to read air fuel ratio, as a wide band O2 sensor.
Be very cautious on the beginning, start the basic adjustments with a richer map and conservative timing. Starting
with a lean map and an advanced timing may lead to serious damage to the engine. Never put your engine under load
while it`s not fully tuned.
When generating a FuelTech base map, some basic information is needed:
Compression ratio: used to correctly estimate the timing tables. A low, medium or high compression ratio is
defined according to the fuel used on the engine and if it is turbocharged or naturally aspirated. I.e., a 10:1 compression
ratio for a naturally aspirated engine using ethanol
Fuel type: select information used to calculate a more accurate base map for your engine.
Primary and secondary in total flow: select the flow of the injectors responsible for the naturally
aspirated/low load range of the engine.
Initial boost for secondary injectors: set here the pressure you want the secondary bank to start opening,
usually under boost. This option is only shown when using two banks of injectors.
Camshaft: select the characteristic of the engine camshaft. When selecting high profile camshaft, all injection
tables from absolute vacuum until -4.3psi are equal, as this type of camshaft does not have steady vacuum at idle speed.
When selecting low profile camshaft, the injection times at vacuum phase are filled up in a linear manner.
The ECU will show a warning that the current map will be
overwritten by the FuelTech base map.
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