Edit CTS Correction

Displays a 2D graph of the percentage of fuel added or removed based on engine coolant temperature.  This allows the user to program the amount of warm-up enrichment.

Prior to making any final adjustments to this graph, the base fuel table should first be properly calibrated at normal operating temperature.  Once the engine idles and drives as desired when fully warm, let the engine cool completely.  Restart the engine and make any adjustments to the warm-up enrichment table as the engine begins to warm up.  Typically, the lower the coolant temperature is, the more warm-up enrichment will be required to maintain a steady idle and responsive throttle while driving.  The percentage of enrichment typically drops until normal operating temperature is reached, at which point the warm-up enrichment should be zero.

Edit ATS Correction

Displays a 2D graph of the percentage of fuel added or removed based on inlet air temperature.

In speed/density mode, the air temperature measurement is already taken into account in the fuel calculation.  The effects of temperature on an air mass are known; therefore, a change in intake air temperature from 105 degrees to 70 degrees has a very predictable effect on the density of the air going into the engine.  The laws of physics dictate an inverse relationship between the temperature of air and its density - the lower the air temperature, the greater the density of the air.  For this reason, it is common practice to "zero out" this entire graph and let the ECU handle this.   

However, some situations require different logic.  For example, in a supercharged car, air temperatures climb very quickly, especially if an intercooler is not used.  When air temperatures become very hot, a good way to help prevent damage and cool things off a bit is to add fuel.  However, the known relationship between air temperature and air density states that hotter air is thinner and requires less fuel to maintain the same air/fuel ratio.  The speed/density algorithm will lean out the fuel mixture as the air temperature increases, but in situations such as this, adding fuel at higher air temperatures makes more sense.

In Alpha-N mode, no automatic air temperature compensation happens.  The only fueling changes related to air temperature are those specified in this table.