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Originally Posted by GreenTDI
The engine lost a few HP at higher RPM's, that's true and that's what I experience. But oddly enough it also gained torque in the low RPM range.
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Not so bad at all.
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Result: it makes it easier to drive at low engine speed = less consumption/ emissions. And with easier I mean: smoother and less 'explosive'.
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At a lower load it also leads to a decrease on exhaust gas temperatures, which may seem bad at first because it would eventually take longer for the DPF and other aftertreatment devices to reach their optimum temperatures, but the ECM may occasionally trim the air/fuel ratio leaner more often in order to raise the EGTs accordingly.