View Full Version : Vacuum hose: 3mm or 4mm (1.8t)

06-10-2010, 06:28 AM
Read different posts regarding vacuum hose sizes. It was either 4mm or 3mm. Decided to order 3mm silicone vacuum hose (2meters), so it'd be hold the nipples harder [:D], no need for zipties. But I just realized that it might affect BOV/DV response because its too restrictive.

Should I order 4mm hose or will I be fine with 3mm?


06-10-2010, 12:54 PM
you may not get the 3mm to fit over the DV nipple tbh, depends on the hose.

4mm is what i use, it's small bore fuel pipe with nylon re inforcing, seems to do the job and doesn't go soft when hot like the silicone hoses

06-10-2010, 09:41 PM
As far as I know, all of the Audi standard stuff is 3.5mm ID.

06-12-2010, 12:18 AM
Oh ok. Thanks for the info :)