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-   -   Wierd Boost Problem (https://www.audiforums.com/forum/b5-models-69/wierd-boost-problem-109520/)

Brakisshuro Aug 6, 2008 06:50 PM

Wierd Boost Problem
 
Ok so I have a 01 1.8T AWM. I have a forge 007, Revo Stage one, and a brand new k03 turbo from Audi. We have went through and replaced both boost controllers, half my hose's, and the vacum pump y thing. Here is the odd thing. When I am under light acceleration, like 1/3 throttle, my car is a rocket, full throttle or if I did not hit that magic throttle spot, feels normal. WTF?

onepoint8tee Aug 6, 2008 06:52 PM

Got a boost gauge?

Brakisshuro Aug 6, 2008 06:54 PM

a temp one. I am pushing almost 22 when I am 1/3 throttle and flying and like 13-14 full throttle

onepoint8tee Aug 6, 2008 07:01 PM

EDIT

Im an idiot. Whenever i see or type "boost gauge" i start thinking MBC for some reason

Brakisshuro Aug 6, 2008 07:05 PM

I don't have a MBC, unless revo does that by default and I need to turn it off?

onepoint8tee Aug 6, 2008 07:09 PM

What do you mean they replaced both boost controllers?

Brakisshuro Aug 6, 2008 07:17 PM

Well there is the one on the bottom of the intake, then there is another one from my understanding. My tech is stumped and I have enough basic knowledge to play around.

ghost6303 Aug 6, 2008 09:26 PM

theres the wastegate on the turbo that allows exhaust gases past the turbine to prevent it spinning out of control, this is controlled by the n75 valve (or aftermarket boost controller).

theres a diverter valve that allows the pressure in the intake pipeing to escape while the turbo is still spinning while the throttle plate slams shut (when you take your foot off the gas suddenly)

if your wastegate isnt functioning untill full throttle for some reason, or you have a bad n75 and it isnt opening the wastegate correctly, that might explain your problem.

14-16 psi at full throttle is what a chip would normaly give you. no drop in chips for k03's run over 20 psi unless you have a manual boost controller and cranked it up yourself.

Brakisshuro Aug 6, 2008 10:49 PM

well the turbo and wastegate are new, I am not certain about the n75's exact location. I will check that next, can you point it out for me?

Tweaked Aug 6, 2008 10:51 PM

Sounds like boost creep... as ghost said, usually an N75 or wastegate issue.


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