Been doing my research on different common rail pumps as down the track I may need to upgraded to a higher pressure pump. Currently all Yd25's have the Dense HP3 made in either Hungary or Thailand which is capable of 1800Bar. A Bosch CP3 looks like the best upgrade capable of 2000Bar. Denso don't offer anything above 1800Bar although they do offer a HP4 which is used in light truck. While it doesn't offer any more pressure its triple plunger design can flow 1.5 times the amount of fuel a HP3 does
I ended up reading the entire 134 page Denso service manual, a very interesting read as it covered absolutely everything to do with how a common rail stem works
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