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Message: [QUOTE="tbsimmons, post: 1205286, member: 2026"] I have not tuned a diesel. But every MAF vehicle I have I have tuned without a MAF first and then with one then to power. I am sure the diesel uses the MAF somehow for fueling or to talk with the MAP, other sensors. Easy way to test this theory, put a 0 in all the MAF scales and see what occurs. What you are seeing is what I was talking about scaling a MAF. Every MAF is different meaning each one will give a different Hz number the computer reads for a given gram per second of air. Now I have never seen just an intake change the tuning, the sensors usually adjust enough for that, unless the intake is sp poorly done in the first place. What I see when the MAF really needs adjusting, change in power, more air, like your turbo. More or less air at low throttle angles. For taht given throttle angle the PCM is used to seeing this amount of air, well that changed. In my opinion is why you felt a difference not because of the intake. I bet if you put the stock intake back on at low throttle angles the truck would feel the same as it does now. [/QUOTE]

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