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Upgraded Fuel Pressure Return Valves (PRV): downsides???

AudiB720TS Oct 12, 2018

  1. AudiB720TS

    AudiB720TS Active Member


    For my stage 3 build I have sourced a OEM RS4 PRV (I think 145 bar).
    My tuner is suggesting I get a 155 bar PRV instead. APR has one, and its very pricey.
    There is also a more affordable 165 bar PRV from a UK tuner that is cheaper than the APR product.

    I am thinking of getting the 165 bar PRV.

    What I need to know is: are there downsides / drawbacks to going with the higher pressure valve? Or put another way: why would not all PRVs be 165 (or higher) bar?

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