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Hi,
I keep following your post as sort of a dream that I'll never go for (doesn't fit my usage of my beetle) but still, I'm impressed.
About the Fuel pressure, I run a CB Quicktune kit on my 2007 engine and I also have issues with the fuel pressure that I don't understand. All I know from the logs is that fuel pressure (3bar / 45psi) at idle tends to drop quickly after the engine has been running for a few minutes. I get the feeling the fuel pressure regulator aren't all that reliable but I have no certainty.
I have done some testing, it has nothing to do with angle of the FPR or temperature, it just happens...
Maybe you could try changing the FPR and see if it solves your problem.
Seb
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