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Julian,
Very strange results from your latest installment. It goes contrary to everything I have ever read and experienced with a diesel. Numerous papers and test stand experiments show that a diesel with a leaner mixture ( more air and using the same amount of fuel ) produces more power.
With the lower pressure drop on the intake there will be a higher pressure in the rest of the intake. This would reduce the amount of EGR that can be used. I'm betting that the emissions computer is restricting fuel to limit NOx.
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