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What is the inside diameter of the vaccum hose that connects to the N75 valve?

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Old 06-04-2005, 12:03 PM
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Default What is the inside diameter of the vaccum hose that connects to the N75 valve?

The answers I do not want to hear are 3.5 mm or 4mm because both of those are WRONG. I have some silicone 3.5 mm *shoved* on there at the moment, but the rubber 4mm I have wouldn't even come close to sliding on. I am guessing 5m or 5.5 mm easily. Anyone know for sure?
Old 06-04-2005, 02:20 PM
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.250" should work fine .. No need for metric IMO
Old 06-04-2005, 02:34 PM
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Default that hose is actually a special audi part. if you look at an OEM one...

one side is 4mm ID and the side at the N75 valve is 7mm ID.
Old 06-04-2005, 03:38 PM
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Default .250 inches is 6.35 mm which is pretty damn close.

right now I have 3.5mm which is .1378 inches, or about a 50% restriction.
Old 06-04-2005, 04:40 PM
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Default On a nDBW Stage III a straight 1/4 will work fine. The wastegate actuator and the nipple on the

compressor housing will both accept a 1/4 inch ID hose. Both want to have clamps applied tho ...
Old 06-04-2005, 06:30 PM
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good to know yippers, thanks.
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