boost gauge reading

[steve bain]

Afternoon.

So i have my gauge fitted and it reads what i suspected! very low.

20 wotsits for vacuum and 3psi boost.

does this point at boost leak? there is nothing obvious so i think i will pressure test it, otherwise it runs fine.

Steve

 

[S3 Nattie]

Ye, thats around actuator pressure I think. Have a look at your N75 valve and check its all connected right. Also were have you plumbed you gauge into.

 

[steve bain]

just been reading this and disconnected the actuator. boosted fine. so guess this means n75.

http://www.audi-sport.net/vb/a3-s3-forum-8l-chassis/110931-going-boost-problem-help-please.html

heres a picture. does it look about right? top pipe disapears off towards the turbo. left pipe goes towards wastegate

I plumbed the gauge into fuel pressure reg as these instructons.
http://forums.generationdub.com/showthread.php?t=15536&page=1

 

[steve bain]

looking at this

VWVortex.com - audi tt mbc install - aem tru boost mbc/boost gauge

i think the top pipes are the wrong way round. wouldn't suprise me. the DV was back to front!

 

[steve bain]

good news i think! hopefully someone can confirm what i have done is correct. based on advice from elsewhere i took my DV off and blew into the small nipple end. i had to blow hard but air did pass! so i guess diaphragm is knackered and is only letting 3psi build up. does this make sense?

i have no codes shown from VCDS.