Ignition, BioPower

Different ignition timings are required with ethanol mixture due to the different properties of ethanol as fuel. For this reason, a further matrix has been added for ignition timing with E85 operation.

With an adapted ethanol content of 0-5% the table for petrol operation is used, while at 80-85% the new table for E85 is used. With an ethanol content between 5-80% the torque varies steplessly between the two tables.

The high octane rating in ethanol enables the additional use of slightly advanced ignition in many operational cases. This results in an improved combustion efficiency and lower exhaust temperature. The increased combustion efficiency means that the increase in fuel consumption is not so high with high ethanol content. The lower exhaust temperature means that fuel enrichment is not required at high engine speeds.