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Direct spark / waste


Sparta

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Hello!

We are running different Link Ecu's on our engines (4-cyl).

Question I have is:

Normally we run direct spark and sequential injection. But if we lose the cam-signal (for example broken sensor) we would like to have the oportunity to switch to waste spark. Since we have 4 separate coils this will not work (only fires 1 and 2 when in waste mode). Is there a way to get around this problem?

Best Regards

Martin Claesson, Motordesign Sweden

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If the cam signal is lost when the engine is running, with most of our trigger modes it will stay in sync and keep running sequential.  Also most of the missing tooth trigger modes will still start and run sequential with no cam signal - just it will take more attempts to get it started as it will sync 360 out approx 50% of start attempts.

The problem with your proposal is if you had tuned the engine with sequential fuel and direct spark, then the fuel tune would not be accurate if you changed to batched injection - you would need two different tunes, not just a change of ignition mode.

Having said that I believe there is a planned future feature to automatically swap to wasted spark for quicker start up and this feature may have some option to allow a quick change to wasted spark without wiring changes.

 

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