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Fruita CO | Has to be done on a test stand, but a good pump guy can tighten up the regulation on the governor. Makes it open up a little quicker when a load comes on. That always seemed to help 4630's, which were the worst about no low-end. The other is to use a 40 series turbo, they make a little more boost at lower RPM. This has pretty much been taken care of by the aftermarket, I think. They mostly sell the same turbo for all 30-40 series now.
Another thing that can be done on early pumps is to remove the magnet in the rack plug...doesn't have anything to do with power or torque, but it eliminates the 1200 RPM sparrow-gassing tar-flavored run-up when it starts. Starts more like a 50 series, the excess fuel kicks out as soon as it starts.
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Deere aneroid
