I think theys did
Still trying pre-compressor injection... but nothing conclusive yet. BY lowering the onset pressure from 10 to 8psi on my 1.9TD diesel, I was fairly sure that a small effect was noticeable (0.3mm jet, not a lot of water) but then other things conspired against my tests
Have bought some temperature instrumentation to see if I can detect a reduction in charge temp after the compressor, or rather, how significant it is