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Max SOI Timing

Practical Diesel Tuning

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Discussion and questions related to the course Practical Diesel Tuning

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What would be the reason for the 1 Deg Max in the high fueling of 1400-1600 rpm also 2000 rpm is 4 Deg, using the 50/50 timing calculation the course teaches I get 8 Deg at 2000 rpm at 100mm3. I don't have a dyno to test changes but how much is being safe?

Thanks

Graham

""

It looks to me like the factory is trying to protect you head gaskets. I wouldn't mess too much with the lower cells in 1400-2000 unless you've got upgraded internals, a cylinder pressure monitor or some other way to validate your changes.

Nick

Could it be that on high fueling areas 1400-200rpm SOI is retarded and more retarded = more heat in the cylinder, turbo spools due to the heat and exhaust flow, therefore more heat the turbo spools faster maybe?

Good thought Trim. If this were a performance calibration I would agree with that possibility.

With the Calibration being from a stock vehicle, and the vehicle likely having strict lambda limits it would be unlikely that the ECM would allow fueling of 70-100mm3 below 2000RPM unless there existed sufficient air to allow for stoichiometric combustion. In this case the turbo would most likely already be pretty well lit.

-Nick

Thanks for the reply Nick. Yes, that’s probably right.