DIYers who modify (IC, dialed up pump, larger turbo) want to be able to deliver more fuel. Some will use Volkswagen injectors with SD 265 nozzles. They have a two spring/two stage design that is not easily tested. I can test for the opening/ pop pressure but can't tell you which spring is moving or when the other opens. Also, shims for them are proving difficult to get.

KCA type (most of what we have) are the ones I can do fairly quickly.

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1987 300D (230,000 mi on a #14 head-watching the temp gauge and keeping the ghost in the machine)
Raleigh NC - Home of deep fried sushi!