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

Can someone explain this MBC setup?

Thread Tools
 
Search this Thread
 
Old 05-29-2005, 09:07 AM
  #1  
AudiWorld Super User
Thread Starter
 
davenew's Avatar
 
Join Date: Feb 2004
Posts: 7,825
Likes: 0
Received 0 Likes on 0 Posts
Default Can someone explain this MBC setup?

They have a pressure regulator installed to prevent overshoot. I don't see how it would work.
<img src="http://www.mpperformance.com/catalog/images/SMBC.jpg"><ul><li><a href="http://www.mpperformance.com/catalog/product_info.php?cPath=29_30&amp;products_id=44">h ttp://www.mpperformance.com/catalog/product_info.php?cPath=29_30&amp;products_id=44</a></li></ul>
Old 05-29-2005, 03:05 PM
  #2  
Audiworld Sponsor
 
DAP@EPL's Avatar
 
Join Date: Jun 2000
Posts: 19,700
Likes: 0
Received 0 Likes on 0 Posts
Default The pressure regulator is just functioning as an adjustable bleed for the wastegate line.

Most MBCs have a hole to bleed off pressure in the wastegate line so the the wastegate doesn't get held open once boost pressure drops below the MBC setpoint. The pressure regulator will only allow X psi to go to that line and vent the rest.

If we are using a parallel setup with the N75, the bleed (and pressure regulator) is unnecessary as the N75 bleed does the job for it.

-Dave Pramanik
Old 05-29-2005, 07:46 PM
  #3  
AudiWorld Super User
 
Mike2kS4's Avatar
 
Join Date: Jun 2002
Posts: 12,088
Likes: 0
Received 0 Likes on 0 Posts
Default

Yep. It's an MBC with adjustable bleed. I ran a setup like this till I discovered AVCR=hotness
Old 05-30-2005, 07:32 AM
  #4  
AudiWorld Super User
Thread Starter
 
davenew's Avatar
 
Join Date: Feb 2004
Posts: 7,825
Likes: 0
Received 0 Likes on 0 Posts
Default Was it you who said APR doesn't like AVCR?

Someone said the part throttle ramp-up with the AVCR might cause problems with APR, even with TCD.
Old 05-30-2005, 07:47 AM
  #5  
Elder Member
 
PSmalls::DoggieStyle's Avatar
 
Join Date: Jan 2004
Posts: 30,248
Likes: 0
Received 0 Likes on 0 Posts
Default

DAP has said it doesn't like MBC only. You could probably tweak AVCR for slower ramp up.
Old 05-30-2005, 10:12 AM
  #6  
AudiWorld Super User
 
Mike2kS4's Avatar
 
Join Date: Jun 2002
Posts: 12,088
Likes: 0
Received 0 Likes on 0 Posts
Default Yep, you can make AVCR ramp however fast or slow you'd like...

<center><img src="http://pictureposter.audiworld.com/38083/cimg0951.jpg"></center><p>You should have little trouble tweaking the curve to placate any chip. Combined with a TCD, it's golden
Old 05-30-2005, 10:17 AM
  #7  
Elder Member
 
PSmalls::DoggieStyle's Avatar
 
Join Date: Jan 2004
Posts: 30,248
Likes: 0
Received 0 Likes on 0 Posts
Default I think I should get one.....

Come to MI and wire it up for me. It'll be a good excuse for us to hang out. :P
Old 05-30-2005, 10:20 AM
  #8  
AudiWorld Super User
 
Mike2kS4's Avatar
 
Join Date: Jun 2002
Posts: 12,088
Likes: 0
Received 0 Likes on 0 Posts
Default

Ok, sure. But your cheapass has to buy it first. That may take a loooong while
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
jsbell_87
S4 / RS4 (B5 Platform) Discussion
8
10-10-2008 04:15 PM
Im@wesome~ out!
S4 / RS4 (B5 Platform) Discussion
40
11-30-2007 05:36 PM
BigEd
A4 (B5 Platform) Discussion
0
04-11-2005 06:32 AM
Imolavirus@BuehnEngineering
S4 / RS4 (B5 Platform) Discussion
13
09-17-2003 04:32 AM



Quick Reply: Can someone explain this MBC setup?



All times are GMT -8. The time now is 12:26 AM.