Joke or not, that 7-8 PSI boost makes a nice difference. Just about anybody with a background in auto-engineering will tell you that 10 PSI is the max-safe level for an indirect injected diesel with a mechanical compression ratio of over 20-1. That is, if you want it to last a long time. Engines running high boost usually get lower compression pistons.
I've got no doubt that raising boost to 25 PSI on an IDI engine will make it scream. It can also make a time-bomb out of it. If your's has done well for you, it's an anomalie and not the rule. Modern high-boost direct injected diesels usually run mechanical compression ratios of 17 or 18 to 1, to handle that boost (that raises the effective compression ratio).
My Ford ATS factory setup has a wastegate, and I can easily raise boost with a simple adjustment (but I don't want to). If I want to drive a diesel with more boost, I drive my 92 Dodge with the 5.9 Cummins. It's built to handle it.
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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