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Tuning Ignition

EFI Tuning Fundamentals

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Discussion and questions related to the course EFI Tuning Fundamentals

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At the 19 minute mark, Andre says that at low RPM, ignition must be set earlier and at higher RPM, it does not need to be set so early. But prior to that, he says, using the graph, that as RPM increases, so does ignition advance. Arent these 2 statements contradictory? Can you please point out what im missing?

Next, to conclude, I would like to confirm that essentially when tuning, what needs to be done is

1) Tune each individual cell in the VE table using the correction factor method based on AFR

2) Tune each individual cell based on ignition timing using the dyno to MBT

Where does the target AFR table fit into this process?

Actually I say 'at light load, or low throttle openings', not 'low RPM'.

1. Yes

2. Yes - There will be some back and forth once you have the AFR and ignition dialled in as the optimal ignition timing will change as you alter the AFR as discussed in the Understanding AFR course.

The AFR target table should be set to your target AFR before you start tuning, then you adjuts the VE table until you reach the target AFR. You may benefit from watching some of the VE based worked examples in the Standalone Tuning course so you can see how this all works.

I see. I have taken note of the 'light load' correction. Why would the AFR have to be altered again after tuning the ignition - Would it be to get the actual AFR values as close to the target AFR values? Would this be done on the VE table or the fuel table?

Sometimes we find a richer AFR will allow an increase in timing on a knock limited engine which may show a net improvement in power.

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