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Correction Tables

Air Temperature Compensation As the temperature of air changes, so does its density. This in turn can cause changes in the air/fuel ratio. As the air temperature decreases, its density increases for any given altitude and therefore more fuel is needed to retain the desired air/fuel ratio. The same can apply to ignition timing. An increase in air temperature will increase the chance of pre-mature detonation. You can compensate for these effects by using the air temperature compensation tables for fuel and ignition.

By installing a calibrated air temperature sensor to the manifold or air filter box you can measure the incoming air temperature and use the air temperature compensation tables to adjust the fuel delivery and ignition timing.

NOTE: You must ensure to minimize the effect of heat soak on the sensor by placing the sensor in a location where the airflow is maximum and it is not heavily effected by engine temperature and thermo fan blow off.

-20C

-10C

0C

10C

20C

30C

40C

50C

60C

12

9

5

2

0

-2

-5

-7

-9

70C

80C

90C

100C

110C

120C

130C

140C

150C

-11

-13

-13

-13

-13

-13

-13

-13

-13

The table below shows a good starting point for fuel compensation. We cannot recommend a starting point for ignition because this would be different for each

engine.

CAUTION: If you will be using air temperature compensation then DO NOT start tuning while this table has zero values and then enter the values after. You must calibrate the sensor and enter these values before you tune the engine. After tuning is finished you may find that you need to adjust the air temperature compensation tables for fuel and timing slightly because of changes in air temperature due to climate or altitude changes.

Engine Temperature Compensation (Choke) When an engine is below its optimum operating temperature it needs extra fuel to start and run smoothly. The same can apply to ignition timing. An increase in engine temperature will increase the chance of pre-mature detonation. You can compensate for these effects by using the engine temperature compensation tables for fuel and ignition.

By installing a calibrated engine temperature sensor to the engine you can measure its temperature and use the fuel and ignition compensation tables to adjust the fuel delivery and ignition timing.

CAUTION: Before tuning, ensure that the engine is at full operating temperature and that there is zero (0) compensation at that temperature. As a safe guard you can decrease the ignition advance at dangerously high engine temperatures.

Stinger 4 instruction manual version 2.0

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