B5 Models Please discuss all 1996 - 2001 B5 A4 topics here...

Wierd Boost Problem

Thread Tools
 
Search this Thread
 
  #1  
Old 08-06-2008, 06:50 PM
Brakisshuro's Avatar
1st Gear
Thread Starter
Join Date: May 2008
Posts: 15
Default 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?
 
  #2  
Old 08-06-2008, 06:52 PM
onepoint8tee's Avatar
Site Moderator
Join Date: Sep 2005
Posts: 13,664
Default

Got a boost gauge?
 
  #3  
Old 08-06-2008, 06:54 PM
Brakisshuro's Avatar
1st Gear
Thread Starter
Join Date: May 2008
Posts: 15
Default

a temp one. I am pushing almost 22 when I am 1/3 throttle and flying and like 13-14 full throttle
 
  #4  
Old 08-06-2008, 07:01 PM
onepoint8tee's Avatar
Site Moderator
Join Date: Sep 2005
Posts: 13,664
Default

EDIT

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

Last edited by onepoint8tee; 08-06-2008 at 07:09 PM.
  #5  
Old 08-06-2008, 07:05 PM
Brakisshuro's Avatar
1st Gear
Thread Starter
Join Date: May 2008
Posts: 15
Default

I don't have a MBC, unless revo does that by default and I need to turn it off?
 
  #6  
Old 08-06-2008, 07:09 PM
onepoint8tee's Avatar
Site Moderator
Join Date: Sep 2005
Posts: 13,664
Default

What do you mean they replaced both boost controllers?
 
  #7  
Old 08-06-2008, 07:17 PM
Brakisshuro's Avatar
1st Gear
Thread Starter
Join Date: May 2008
Posts: 15
Default

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.
 
  #8  
Old 08-06-2008, 09:26 PM
ghost6303's Avatar
3rd Gear
Join Date: Oct 2007
Location: CT
Posts: 2,158
Default

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.
 
  #9  
Old 08-06-2008, 10:49 PM
Brakisshuro's Avatar
1st Gear
Thread Starter
Join Date: May 2008
Posts: 15
Default

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?
 
  #10  
Old 08-06-2008, 10:51 PM
Tweaked's Avatar
3rd Gear
Join Date: May 2008
Location: CT
Posts: 1,900
Default

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


Quick Reply: Wierd Boost Problem



All times are GMT -4. The time now is 09:16 PM.