[Bimmer_Bro]

Are you positive your bov is not leaking anymore?
Your car makes boost strong and fast. But almost instantly the wgdc starts to slowly climb to keep at target, then starts to loose that battle at higher rpm's. I am no expert but it looks like boost pressure is still bleeding off somewhere.

[Saif2018]

Originally Posted by sliver 335

will do, ill go back to 9. Question though, Ive seen other people's logs with OEM turbos and they boost all the way till redline with around 65 wdgc. Does this mean that the turbos are failing? I'm jus confused about how others are able to reach 16 psi at redline, but I can barely meet 13 psi with really high wdgc (80%)

Have you done a smoke test to confirm you haven't got a boost leak?

WGDC usually climb when they are either shot or more commonly due to boost leak.

[witty]

Originally Posted by Saif2018

Have you done a smoke test to confirm you haven't got a boost leak?

WGDC usually climb when they are either shot or more commonly due to boost leak.

that's what im trying to figure out aswell. like i've said i've done vacuum right and i've done the typical boost leak test with the air compressor and no sound of air coming out of anywhere. im going to guess it has to be some boost leak somewhere so. I've gone ahead and purchase a wanger tuning comp kit and will see if issue still persists

[335i54n]

ur turbos are bad imo, try adjusting the wg

[witty]

Originally Posted by 335i54n

ur turbos are bad imo, try adjusting the wg

what should i adjust them too7 they fully close at 7 pounds of Mercury already so i don't know if it's the turbos. they don't leak either

[335i54n]

well not fully closed at higher rpms it seems, couple turns/mm and recheck. try slowly rolling on the boost after 5k and if you see a change, then your wg cant hold at higher rpm/loads

[witty]

Originally Posted by 335i54n

well not fully closed at higher rpms it seems, couple turns/mm and recheck. try slowly rolling on the boost after 5k and if you see a change, then your wg cant hold at higher rpm/loads

will try that soon. i wouldnt doubt it's the turbos thought oem turbos @101k miles

[witty]

jus did a pull at 5k rpm and i'm about 2-3 psi below target. my wdgc keeps going up till 80% and boost still keeps going down.

[studio54]

if bov, boost & vaccum leak already tested ok, maybe tired boost solenoids ?

[iqraceworks]

Originally Posted by sliver 335

jus did a pull at 5k rpm and i'm about 2-3 psi below target. my wdgc keeps going up till 80% and boost still keeps going down.

That's pretty much a sign that your turbos are giving all they can....and they just can't provide the airflow needed to meet your boost targets.

I pulled some logs from back when I had stock turbos and was running the MHD V5 E40 tune. By 5,000rpms I was 1-2psi under boost target (21.4psi), by 5,500rpms the turbos were only able to make 17.7psi (21.4 target).

Stock turbos just don't flow well up top......especially if they have some age on them.