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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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