S4 / RS4 (B5 Platform) Discussion Discussion forum for the B5 Audi S4 & RS4 produced from 1998-2002

Why is my boost not changing with MBC in parallel

Thread Tools
 
Search this Thread
 
Old 11-17-2005, 01:02 AM
  #1  
AudiWorld Member
Thread Starter
 
rmonckton's Avatar
 
Join Date: Oct 2004
Posts: 193
Likes: 0
Received 0 Likes on 0 Posts
Default Why is my boost not changing with MBC in parallel

Hi All,

Giax X software with mbc in parallel.

Installed the mbc (after sealing the bleed holes on it), no matter how much I turn the mbc it does not change boost at all...

It hits exactly 1 bar and tapers off slowly, it's very smooth and no spikes but boost is not high enough (and I will get a negative deviation because it is requesting 1.2-1.3 bar).

Any sugesstions?
Old 11-17-2005, 01:03 AM
  #2  
Member
 
Island Boy::Jeproks's Avatar
 
Join Date: Jun 2003
Posts: 1,983
Likes: 0
Received 0 Likes on 0 Posts
Default

any idea what code are you running?
Old 11-17-2005, 01:08 AM
  #3  
AudiWorld Member
Thread Starter
 
rmonckton's Avatar
 
Join Date: Oct 2004
Posts: 193
Likes: 0
Received 0 Likes on 0 Posts
Default

old one.. with no mbc it spikes to 1.5 bar
Old 11-17-2005, 01:56 AM
  #4  
Member
 
Island Boy::Jeproks's Avatar
 
Join Date: Jun 2003
Posts: 1,983
Likes: 0
Received 0 Likes on 0 Posts
Default Make sure that you conected it this way. (Pic courtesy of vastperformance)

<center><img src="http://www.vastperformance.com/fpr_mbc_instructions_8_TEXT_web.JPG"></center><p>
Old 11-17-2005, 02:13 AM
  #5  
AudiWorld Member
Thread Starter
 
rmonckton's Avatar
 
Join Date: Oct 2004
Posts: 193
Likes: 0
Received 0 Likes on 0 Posts
Default yeah thanks, I'm sure I have it installed right (I don't have that mbc) I purchased:

A local boost control (I live in Australia)

<a href="http://imageshack.us"><img src="http://img485.imageshack.us/img485/1663/fggbcvbt2503ua.jpg" border="0" alt="Image Hosted by ImageShack.us" /></a>

<a href="http://imageshack.us"><img src="http://img485.imageshack.us/img485/8445/fggbcvcut2009bb.jpg" border="0" alt="Image Hosted by ImageShack.us" /></a>
Old 11-17-2005, 02:16 AM
  #6  
AudiWorld Member
Thread Starter
 
rmonckton's Avatar
 
Join Date: Oct 2004
Posts: 193
Likes: 0
Received 0 Likes on 0 Posts
Default Also, I noticed that no matter where the valve was turned I could not blow through one of the sides.

If that makes sense.. Is this normal?
Old 11-17-2005, 02:40 AM
  #7  
Junior Member
 
Pop3's Avatar
 
Join Date: Jun 2003
Posts: 1,378
Likes: 0
Received 0 Likes on 0 Posts
Default

I would think you should be able to blow through it in one of the positions and directions.
Old 11-17-2005, 02:49 AM
  #8  
AudiWorld Member
Thread Starter
 
rmonckton's Avatar
 
Join Date: Oct 2004
Posts: 193
Likes: 0
Received 0 Likes on 0 Posts
Default before I sealed the holes I could blow through the side with the arrow toward

the actuator.. But now that the bleed holes are sealed, I can not blow through them..
Old 11-17-2005, 03:26 AM
  #9  
AudiWorld Member
Thread Starter
 
rmonckton's Avatar
 
Join Date: Oct 2004
Posts: 193
Likes: 0
Received 0 Likes on 0 Posts
Default Is it normal for giac X to request 1.5 bar??? How can I lower it? Can I

adjust the n75 valve to bring requested down??

If the mbc isn't going to work for me, all I want is 1.2 max boost..

Ps. From what I have seen running mbc only tapers almost the same as n75... This would be my last option.
Old 11-17-2005, 03:37 AM
  #10  
Junior Member
 
Pop3's Avatar
 
Join Date: Jun 2003
Posts: 1,378
Likes: 0
Received 0 Likes on 0 Posts
Default

My industrial MBC has a hole when I use it in paraller. Can you open the hole again?


Quick Reply: Why is my boost not changing with MBC in parallel



All times are GMT -8. The time now is 07:00 PM.