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-   -   Lost Boost (https://www.n54tech.com/forums/showthread.php?t=58395)

Jscottrad 06-11-2019 08:11 AM

Lost Boost
1 Attachment(s)
I've read and done all the common checks. No boost leaks, replaced vacuum lines for waste gate control. Thought I would get a second opinion while I wait for my new boost solenoids to show. PWM is 99 but I'm slow to spool and only reach about 10psi. Vargas turbos with billet compressor wheel (20% more boost according to them) I hit the 17psi target in map 2 normally with no problems. All the normal mods. Any advice is welcome.

Vorsprung_CJB 06-11-2019 08:59 AM

Did you check DV vacuum lines? Reminds me of when one of those is disconnected.

Jscottrad 06-11-2019 10:58 AM

DV's are in my back yard shed. checked vacuum to blow off valve and made sure valve was sealing tho...

Jscottrad 06-11-2019 02:31 PM

Finished replacing all vacuum hoses and both bleed solenoids, still no help. while looking for a leak downstream of the turbos noticed when running there is oil vapor coming from rear air inlet. I have an air oil seperator installed. Could I be losing boost to the PVC system?

Haynpunch 06-11-2019 02:43 PM

Did you check wastegate movement while applying vacuum with a hand held vacuum gun or measure vacuum at the boost solenoids?

N54 WG Vacuum Line Testing HOW-TO - YouTube

Jscottrad 06-11-2019 03:07 PM

Yes, and on start up both waste gates go full closed, unplugging boost solenoids makes them return to wide open

Jscottrad 06-12-2019 02:28 PM

Found the problem...
1 Attachment(s)
Time to rethink which turbos to buy...

Haynpunch 06-12-2019 03:23 PM


Dave @ BMS/Fuel-It! 06-13-2019 10:36 AM


Originally Posted by Jscottrad (Post )
Time to rethink which turbos to buy...


Vorsprung_CJB 06-13-2019 03:57 PM

Vargas strikes again!

How many miles on those?

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