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BEST DUMP VALVE FOR 1.8 GTI TURBO


jamesXXX
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My remapped S3 runs fine on the Bosch OEM unit.

As I understand it, the 1.8T is designed to run with a recirculating (diverter) valve and not an atmospheric dump valve which can lead to problems. Its a resillient unit these days.

How can you be sure your issues relate to your dump valve though?

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Yes indeed. In all honesty, its the ancilliary hoses that are far more likely to suffer high boost-related problems. I imagine I'm running more boost than you (1.5bar) and I have no cause for concern with my diverter valve. With the OEM diaphragm diverter valves failures generate a distinctive "honking" sound in most cases. With a dump valve I'm not so sure.

As I understand it, certain modifications are required to the boost circuit to accomodate a dump valve - its possible that these have not been done correctly - if you're positive that the valve is to blame...?

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