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Question for people that have done vacuum line leak test
I'm pretty sure I have a very tiny vacuum line leak somewhere. My car will hit target boost but will have a hard time hitting target boost past 4500 rpms and I do hear a small high pitch noise at WOT. I already did a boost leak test and it's not that.
My question is for people that have done a vacuum line leak test. What does your vacuum gauge read at idle at 100% dwp (default waste gate position)? Mine read 20" of vacuum pressure. I feel like it should read more if there is no leak but I'm not 100% sure.
Thanks for your help.
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09 335xi AT, Pure Stage 2 'DD' turbos, JB4 G5 ISO w/anti-lag, MHD Trebila tune, Fuel-It Stage 2 LPFP, NGK 1 step colder plugs, BMS meth kit w/dual cm7, BMS DCI, VTT inlets/outlet, RB PCV valve, BMS OCC, N20 tmap, Cyba Scoops, Lux H8 160, VRSF 7" FMIC, VRSF DP, Custom exhaust, VRSF Chargepipe, GFB SV50 BOV, ER Sport Series Oil Cooler, UUC front sway, M3 rear sway w/powerflex bushings, BC Racing coilovers, xHP Stage 3, Hawk HPS 5.0 brakes
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