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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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