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Beitrag: [QUOTE="Joe, post: 600132, member: 8607"] Yes, the formula : vacuum fuel pressure + boost pressure = fuel pressure works in general quiet good. But its naturally only possible under perfect conditions: Your fuel pump has to be able to deliver a fuel pressure more or equal to the max. calculated fuel pressure whilst at the same time the maximum of fuel volume stream needed by the engine, can be pushed through the pump and pipes . Your fuel pipes diameter have to be big enough, so that the pipes pressure reduction under high flow is not signifcant. You shouldn't have a hole or leakage in your pipes 4.5 bar vacuum fuel pressure + 2 bar boost pressure = 6,5 bar FP 0,26 bar lost !! This is possible due to problems with the conditions as stated above . But as the overboost lasts not very long, I think it should be ok. Your vaccum value should be 4,2 bar ! 4,9 bar is by far too high ! But I don't understand why the fuel pressure is higher than at 0 bar ! Are you pretty sure that you havn' misread the gauge ? How have you checked your pipes ? A visible check is not(!) enough! It might be possible that you will encounter a little hole or a leakage in one of the small pipes, which can't be detected if not under pressure ! I personally think that a vaccum fuel pressure of more than 4 bar with the stock injectors is a little bit huge. But I know that EDS sells its Phase 3.x kits with such an high FP adjustment. [/QUOTE]

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