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

LOGS. APR Stage 3. 91 octane. Leak at compressor inlet. Bit lean?

Thread Tools
 
Search this Thread
 
Old 12-11-2008, 07:46 AM
  #1  
AudiWorld Senior Member
Thread Starter
 
Roque's Avatar
 
Join Date: May 2007
Posts: 2,991
Likes: 0
Received 0 Likes on 0 Posts
Default LOGS. APR Stage 3. 91 octane. Leak at compressor inlet. Bit lean?

Finally logged my car with ecux. I haven't found any APR stage 3, 91 octane logs so this is a good one for the archives.

I have a known leak at the driver's side compressor inlet, so some unmetered air is getting in. Am I running a bit lean?

I'll log again when I get around to removing the inlet pipe (pain in the ***) and see what's going on with the o-ring.

Does 4.4s FATS sound about right for 91 octane APR in an avant?

Stats:
Avant. ~4000 lbs during log.
Ambient = 65 F.
Altitude = 10 ft.
Relative Humidity = ~60%.
91 Octane.
APR Stage 3. Ver 2, 91 Octane code.
AWE Intercoolers.
APR Bipipe.
APR Stealth exhaust.
Piggie pipes.

BTW, Nye's ECUx Plot is the shiznit.

<img src="http://farm4.static.flickr.com/3264/3098274917_2342908833_o.gif" alt="APR Stage 3 Compressor Leak Run Graphs_20241_image001" />
<img src="http://farm4.static.flickr.com/3042/3099110350_da42342a18_o.gif" alt="APR Stage 3 Compressor Leak Run Graphs_20241_image002" />
<img src="http://farm4.static.flickr.com/3095/3098274845_586d9bb9dc_o.gif" alt="APR Stage 3 Compressor Leak Run Graphs_20241_image003" />
<img src="http://farm4.static.flickr.com/3261/3099110408_b230020bd2_o.gif" alt="APR Stage 3 Compressor Leak Run Graphs_20241_image004" />
<img src="http://farm4.static.flickr.com/3147/3099110330_05b7fc0227_o.gif" alt="APR Stage 3 Compressor Leak Run Graphs_20241_image005" />
<img src="http://farm4.static.flickr.com/3224/3098274893_d9f9b93610_o.gif" alt="APR Stage 3 Compressor Leak Run Graphs_20241_image006" />
<img src="http://farm4.static.flickr.com/3294/3099110388_7b79ec51a6_o.gif" alt="APR Stage 3 Compressor Leak Run Graphs_20241_image007" />
<img src="http://farm4.static.flickr.com/3272/3098275181_be6231390f_o.gif" alt="APR Stage 3 Compressor Leak Run Graphs_20241_image008" />
<img src="http://farm4.static.flickr.com/3182/3099110646_24f416cc71_o.gif" alt="APR Stage 3 Compressor Leak Run Graphs_20241_image010" />
<img src="http://farm4.static.flickr.com/3203/3099110680_40840db623_o.gif" alt="APR Stage 3 Compressor Leak Run Graphs_20241_image013" />
<img src="http://farm4.static.flickr.com/3140/3098275311_9f63b47825_o.gif" alt="APR Stage 3 Compressor Leak Run Graphs_20241_image014" />
<img src="http://farm4.static.flickr.com/3036/3098275333_632c6c1d3d_o.gif" alt="APR Stage 3 Compressor Leak Run Graphs_26656_image017" />
<img src="http://farm4.static.flickr.com/3116/3099110660_82098e3165_o.gif" alt="APR Stage 3 Compressor Leak Run Graphs_20241_image017" />
<img src="http://farm4.static.flickr.com/3009/3099110520_0daf0aaf6f_o.gif" alt="APR Stage 3 Compressor Leak Run Graphs_20241_image018" />
<img src="http://farm4.static.flickr.com/3192/3098275231_2ab2881f5f_o.gif" alt="APR Stage 3 Compressor Leak Run Graphs_20241_image019" />
<img src="http://farm4.static.flickr.com/3266/3098275009_6836c515c4_o.gif" alt="APR Stage 3 Compressor Leak Run Graphs_20241_image020" />
<img src="http://farm4.static.flickr.com/3024/3098275079_3248f2a06d_o.gif" alt="APR Stage 3 Compressor Leak Run Graphs_20241_image021" />
<img src="http://farm4.static.flickr.com/3042/3099110768_6020fa2ffd_o.gif" alt="APR Stage 3 Compressor Leak Run Graphs_20241_image022" />

This plot has been adjusted to SAE conditions:
<img src="http://farm4.static.flickr.com/3188/3099907127_8224014f63_o.png" alt="APR Stage 3 Compressor Leak" />
Old 12-11-2008, 07:56 AM
  #2  
Junior Member
 
DocSlowMiniPerson's Avatar
 
Join Date: Jan 2008
Posts: 1,679
Likes: 0
Received 0 Likes on 0 Posts
Default

Not bad for a fairly conservative tune. You could try adding ~5% primary fuel to test a richer AFR.
Old 12-11-2008, 07:59 AM
  #3  
AudiWorld Senior Member
Thread Starter
 
Roque's Avatar
 
Join Date: May 2007
Posts: 2,991
Likes: 0
Received 0 Likes on 0 Posts
Default

Do you think I'll be a bit richer when I fix my leak at the compressor inlet?
Old 12-11-2008, 09:48 AM
  #4  
AudiWorld Expert
 
TwentyValveB5+S4's Avatar
 
Join Date: Jan 2005
Posts: 34,704
Likes: 0
Received 0 Likes on 0 Posts
Default That's what I was going to say too :)

I know I'm learning when I'm thinking like you and Nye...

His injectors are already close to maxed out, but I guess it doesn't hurt to try
Old 12-11-2008, 09:50 AM
  #5  
AudiWorld Expert
 
nyet's Avatar
 
Join Date: Dec 2000
Posts: 33,078
Likes: 0
Received 0 Likes on 0 Posts
Default you might even go a bit more lean when you fix it. metered air is escaping right now.

add some pri if your trims aren't too bad.
Old 12-11-2008, 09:52 AM
  #6  
AudiWorld Senior Member
Thread Starter
 
Roque's Avatar
 
Join Date: May 2007
Posts: 2,991
Likes: 0
Received 0 Likes on 0 Posts
Default I think you read it incorrectly. The leak is on the INLET. So unmetered air is going in, not out.

All the metered air is going into the compressor and then some more is going in.
Old 12-11-2008, 10:17 AM
  #7  
AudiWorld Expert
 
nyet's Avatar
 
Join Date: Dec 2000
Posts: 33,078
Likes: 0
Received 0 Likes on 0 Posts
Default errr sorry. yea. my bad.

brainfart.
Old 12-11-2008, 10:53 AM
  #8  
AudiWorld Senior Member
Thread Starter
 
Roque's Avatar
 
Join Date: May 2007
Posts: 2,991
Likes: 0
Received 0 Likes on 0 Posts
Default

No prob. I hope fixing the leak helps me a bit.
Old 12-11-2008, 11:33 AM
  #9  
AudiWorld Senior Member
 
OSin456's Avatar
 
Join Date: Aug 2002
Posts: 1,084
Likes: 0
Received 0 Likes on 0 Posts
Default Or just add a meth kit to richen it up a tad.

For straight 91 that tune is just damn solid on 91. Not the fastest, but not pushing the turbos, no frills, just solid.
Old 12-11-2008, 12:30 PM
  #10  
Junior Member
 
DocSlowMiniPerson's Avatar
 
Join Date: Jan 2008
Posts: 1,679
Likes: 0
Received 0 Likes on 0 Posts
Default

It's almost in his favor that they're maxxed up top. Added primary will help mid-range only.


Quick Reply: LOGS. APR Stage 3. 91 octane. Leak at compressor inlet. Bit lean?



All times are GMT -8. The time now is 10:59 PM.