N54 WG Vacuum Line Testing HOW-TO

[@brianbarker6746]

Note! This test in itself will not rule out a defective N54 boost solenoid! To confirm boost solenoid is working properly requires additional testing!

[@IvanIvanov-zm1ot]

Thanks for this guide. I have 0 vacuum on the gouge even after adjusting menu 10 to 5k rpm.. I've done a pressure test and vacuum test (no leaks) also I've replaced both solenoids.. Waste gates function as I applied vacuum directly, so I am not sure what else could be the cause, do you have any suggestions or ideas? Any advice would be greatly appreciated, thank you!

[@paulrinaldi1750]

what should this read if i'm running 100% stock with no JB4 or mods? I'm trying to fix 30ff now before going with JB4

[@friguy4444]

Thank you. Would using the MHD "Waste Gate Rattle fix" work the same as the JB4 setting for this test?

[@TheTruelakersfan]

Wow so my n54 definitely has a problem it has a vacuum of 8 inches.Any ideas?

[@lhughey118]

Thanks for posting this. My vacuum starts at 15, but changes to about 18 when the wastegate position is closed (instead of your recommended value of about 25). Is this indicative of a wastegate that needs to be adjusted? It appears that maybe the wastegate is not closed all the way and strengthens the supporting evidence that the my wastegate(s) are the reason why im not hitting my boost target. Is my line of thinking correct.? Thanks!

[@joeyc2802]

lyndon hughey I only get about 22 instead of 25. Can someone shed some light on this please?

[@Galileo9.81]

possible solinoid issue.

[@karolk.5674]

I had issue with this when I use jb4 to adjust it's 25 but when I disconnected jb4 from car I had 0 vacuum and rattle (rebiulded turbos) and voltage on solenoid 1.3v instead of 6v on idle when I go Wot I got low boost error on jb4 set on menu 10 on 20 I got overboost error

[@realpropertyfreedom]

is that the sound of wastegate ratte?

[@michaelmichael1523]

Tommy Chan no, it cames from injection!

[@mikulamali8833]

Direct Injection Injector noise

[@bslothed3211]

yea. nice. that only applies if you have jp4... yea thanks.. :/

[@bslothed3211]

jb4