1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

for those with no MAP boost sensor

Discussion in 'A4/S4 forum(B5 Chassis)' started by freegeek, Oct 28, 2009.

  1. freegeek
    Offline

    freegeek Member

    Joined:
    Jun 25, 2008
    Messages:
    162
    Likes Received:
    0
    [Oct 28, 2009]
    I finally got round to doing a software release to support AGU engines.

    I calculate the boost pressure this way, boost = ((MAF x 53.5)/RPM) - 1

    It seems to be pretty accurate when tested on my BAM engine comparing the real MAP with the calculated values.

    The pictures below show two similar 4th gear runs from off throttle at 40mph the WOT for about 4 or 5 seconds, the top picture is a plot of the calculated boost, the picture below is an almost identical run showing the actual bost.

    Using the calculated method gives addition vaccum information not available from the MAP sensor as it is before the throttle plate.

    The video below shows it in use using the "agu calculated metod".

    [​IMG]

    #1
  2. Ads

    Ads

    [Dec 27, 2014]

  3. <tuffty/>
    Offline

    <tuffty/> Badger 5 Edition Staff Member Moderator

    Joined:
    Sep 14, 2008
    Messages:
    16,486
    Likes Received:
    1,543
    [Oct 28, 2009]
    ooooooooooooooooo... :D

    Looks good Jim...

    <tuffty/>
    #2
  4. aragorn
    Offline

    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

    Joined:
    Jan 30, 2008
    Messages:
    15,871
    Likes Received:
    353
    [Oct 29, 2009]
    Is that "pressure" absolute?

    1.4bar seems pretty high unless its absolute pressure, in which case it should be called "manifold pressure" rather than "boost pressure"?
    #3
  5. Lee Goodall
    Offline

    Lee Goodall ..got my head together!

    Joined:
    Oct 22, 2007
    Messages:
    2,231
    Likes Received:
    1
    [Oct 29, 2009]
    How much are we looking at for the B5 vent mounted version?

    Aragorn- 1.4bar is not even nearly enough boost ;)
    #4
  6. aragorn
    Offline

    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

    Joined:
    Jan 30, 2008
    Messages:
    15,871
    Likes Received:
    353
    [Oct 29, 2009]
    well i guess its maybe not a stock car, but its what 20psi?

    Sounds high to me, but maybe its a normal figure for a BAM with a remap?
    #5
  7. Lee Goodall
    Offline

    Lee Goodall ..got my head together!

    Joined:
    Oct 22, 2007
    Messages:
    2,231
    Likes Received:
    1
    [Oct 29, 2009]
    1.4 BAR - 20.30532 PSI
    #6
  8. aragorn
    Offline

    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

    Joined:
    Jan 30, 2008
    Messages:
    15,871
    Likes Received:
    353
    [Oct 29, 2009]
    Ye, and a standard car runs about 0.5 bar hence the question.

    In vagcom it shows absolute pressure, so 0.5bar of boost shows as 1500 milibar manifold pressure.
    #7
  9. Lee Goodall
    Offline

    Lee Goodall ..got my head together!

    Joined:
    Oct 22, 2007
    Messages:
    2,231
    Likes Received:
    1
    [Oct 29, 2009]
    Watching the video I'm guessing that it's not a tuned/mapped car so it must be absolute pressure?
    #8
  10. freegeek
    Offline

    freegeek Member

    Joined:
    Jun 25, 2008
    Messages:
    162
    Likes Received:
    0
    [Oct 29, 2009]

    The video is my mapped 270bhp TT, showing boost pressure.
    #9
  11. Lee Goodall
    Offline

    Lee Goodall ..got my head together!

    Joined:
    Oct 22, 2007
    Messages:
    2,231
    Likes Received:
    1
    [Oct 29, 2009]
    Makes sense.. Looks good then :icon_thumright:

    What price are we looking at?
    #10
  12. freegeek
    Offline

    freegeek Member

    Joined:
    Jun 25, 2008
    Messages:
    162
    Likes Received:
    0
    [Oct 29, 2009]
    Hi the price will be £210 in a B5 vent but less if anyone gets a group buy going.
    #11
  13. Foxmeister
    Offline

    Foxmeister Fired Up!

    Joined:
    Apr 1, 2009
    Messages:
    1,779
    Likes Received:
    4
    [Oct 29, 2009]
    Group buy sounds good then. How much discount is on offer?
    #12
  14. freegeek
    Offline

    freegeek Member

    Joined:
    Jun 25, 2008
    Messages:
    162
    Likes Received:
    0
    [Oct 30, 2009]
    There was a group buy thread over in the A3 section somewhere.
    #13

Share This Page