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 - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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