Common questions

# What should engine load percentage be at idle?

## What should engine load percentage be at idle?

So, the baseline of our formula for calculated load at idle is 3.4 grams per second (current airflow) divided by 10.35 grams per second (max airflow) equals 33%. In the last column we saw that normal CL readings at idle could be between 30% and 50%.

What does calculated load value mean?

Calculated Load Value — Indicates a percentage of peak available torque. Reaches 100% at wide open throttle at any altitude or RPM for both naturally aspirated and boosted engines. In which case, I would still expect it to return non-zero values when in neutral, as it’s not transmission load.

The load factor percentage is derived by dividing the total kilowatt-hours (kWh) consumed in a designated period by the product of the maximum demand in kilowatts (kW) and the number of hours in the period.

### How is the engine load calculated at idle?

Now our calculated idle closed-throttle airflow for this 3.0L engine is 10.35 grams per second divided by 3, which equals 3.4 grams per second. So, the baseline of our formula for calculated load at idle is 3.4 grams per second (current airflow) divided by 10.35 grams per second (max airflow) equals 33%.

How to calculate load value for intake stroke?

LOAD_ABS is the normalised value of air mass per intake stroke displayed as a percent. LOAD_ABS = [air mass (g / intake stroke)] / [1.184 (g / intake stroke) * cylinder displacement in litres] air mass (g / intake stroke) = [total engine air mass (g/sec)] / [rpm (revs/min)* (1 min / 60 sec) * (1/2 # of cylinders (strokes / rev)],

How is the PID calculated for a diesel engine?

Compression ignition engines (diesels) shall support this PID using fuel flow in place of airflow for the above calculations. NOTE Both spark ignition and compression ignition engines shall support PID \$04. See PID \$43 for an additional definition of engine LOAD. 05 Engine Coolant Temperature A –40 °C +215 °C 1 °C with

#### What should the CL reading be at idle?

In the last column we saw that normal CL readings at idle could be between 30% and 50%. Now let’s look at the barometric pressure/altitude compensator. We know that as you get higher in altitude there’s less air pressure available, and therefore the MAP/engine vacuum ratio is affected by altitude.

Now our calculated idle closed-throttle airflow for this 3.0L engine is 10.35 grams per second divided by 3, which equals 3.4 grams per second. So, the baseline of our formula for calculated load at idle is 3.4 grams per second (current airflow) divided by 10.35 grams per second (max airflow) equals 33%.

How is the load factor of an engine calculated?

The volume air flow divided by the engine speed determines the engine load factor, called A/N (and displayed on the factory “boost gauge”). As volume air flow increases, injection duration increases.

In the last column we saw that normal CL readings at idle could be between 30% and 50%. Now let’s look at the barometric pressure/altitude compensator. We know that as you get higher in altitude there’s less air pressure available, and therefore the MAP/engine vacuum ratio is affected by altitude.

How is engine load determined in a Subaru?

Engine load is measured by the MAF sensor. In other words, it measures how much air (and fuel) you’re sucking into the engine and then compares that value to the theoretical maximum. When I modified my Subaru’s fueling, boost and ignition maps, all the tables plotting engine load to RPM referenced engine load in CFM… Ruth Doyle