Page 11 of 13 FirstFirst ... 910111213 LastLast
Results 101 to 110 of 124

Thread: E38 VVE Setup Guide

  1. #101
    Joe (Moderator) joecar's Avatar
    Join Date
    Apr 2003
    Posts
    28,403

    Default

    Quote Originally Posted by jmsmotorsport View Post
    Original - Don't mined the huge jump at the start, turned AC on. But you can see as IAT was rising the AFR marginally drifted.

    Updated - After ECT came to temp and Commanded AFR settled at 14.55 the AFR never drifted from 13.30 as the IAT rose.

    I will need to check this all again once temps cool down, start up IAT is already at 34. But at this stage I am satisfied that IAT temp wont affect me BEN MAP while logging out on the road to dial my VVE in.
    Ok, good.

    Can you account for the difference in AFR from 14.55 to 13.30...?

  2. #102
    Senior Member
    Join Date
    May 2015
    Posts
    172

    Default

    Quote Originally Posted by joecar View Post
    Ok, good.

    Can you account for the difference in AFR from 14.55 to 13.30...?
    I wil start to fiddle with the VVE around the idle area and see if that improves it if not I will start to look elsewhere. I'm fairly certain I should get it in the VE as when revs change from AC on to AC off the AFR moves around so my thinking was there is some differences in VE at this MAP and RPM points

  3. #103
    Senior Member
    Join Date
    May 2015
    Posts
    172

    Default

    Quote Originally Posted by jmsmotorsport View Post
    I wil start to fiddle with the VVE around the idle area and see if that improves it if not I will start to look elsewhere. I'm fairly certain I should get it in the VE as when revs change from AC on to AC off the AFR moves around so my thinking was there is some differences in VE at this MAP and RPM points
    adjusted the VVE based on the BEN MAP for the IDLE area and nothing changed with W02 AFR so not sure if I'm adjusting the VVE right or the W02 is displaying a false reading. Once I multiply with the figures from my BEN map I generate coefs and then generate VVE is this correct?

  4. #104
    Senior Member
    Join Date
    May 2015
    Posts
    172

    Default

    Quote Originally Posted by joecar View Post
    Also, does the pid SAE.LAMBDA work...?
    Yes I have now selected it for further logging.

  5. #105
    Joe (Moderator) joecar's Avatar
    Join Date
    Apr 2003
    Posts
    28,403

    Default

    Quote Originally Posted by jmsmotorsport View Post
    adjusted the VVE based on the BEN MAP for the IDLE area and nothing changed with W02 AFR so not sure if I'm adjusting the VVE right or the W02 is displaying a false reading.
    At idle, if cam has sufficient overlap, you may get unburnt fuel/oxygen passing into exhaust, this registers lean on wideband, and when you correct for this in VE/VVE it seems to make no difference.

    Once I multiply with the figures from my BEN map I generate coefs and then generate VVE is this correct?
    Yes. correct.

  6. #106
    Senior Member
    Join Date
    May 2015
    Posts
    172

    Default

    Quote Originally Posted by joecar View Post
    At idle, if cam has sufficient overlap, you may get unburnt fuel/oxygen passing into exhaust, this registers lean on wideband, and when you correct for this in VE/VVE it seems to make no difference.

    Yes. correct.
    Standard cam so overlap won't be an issue, I'm showing rich at idle so I guess I just need to keep dialling in the VVE in this area until it's the same as commanded.

    I also have a odd start issue where it starts and then split second it stumbles the just idles perfect.

  7. #107
    Senior Member
    Join Date
    May 2015
    Posts
    172

    Default

    Also what is the difference between the VVE OPEN and the VVE CLOSED?

  8. #108
    Joe (Moderator) joecar's Avatar
    Join Date
    Apr 2003
    Posts
    28,403

    Default

    IMTV = intake manifold tuning valve (i.e. intake manifold variable length runners)

    open and closed are the two positions (open = long runner, closed = short runner, unless I got them vice-versa)


    if engine is not fitted with IMTV then use the IMTV Open VVE tables.

  9. #109
    Joe (Moderator) joecar's Avatar
    Join Date
    Apr 2003
    Posts
    28,403

    Default

    Quote Originally Posted by jmsmotorsport View Post
    Standard cam so overlap won't be an issue, I'm showing rich at idle so I guess I just need to keep dialling in the VVE in this area until it's the same as commanded.

    I also have a odd start issue where it starts and then split second it stumbles the just idles perfect.
    Try it, but note that the VVE surface should "flow" and not have any abnormal/sudden change.

  10. #110
    Senior Member
    Join Date
    May 2015
    Posts
    172

    Default

    Quote Originally Posted by joecar View Post
    IMTV = intake manifold tuning valve (i.e. intake manifold variable length runners)

    open and closed are the two positions (open = long runner, closed = short runner, unless I got them vice-versa)


    if engine is not fitted with IMTV then use the IMTV Open VVE tables.
    Ah yep that makes sense. Thanks for clearing that up.

Page 11 of 13 FirstFirst ... 910111213 LastLast

Similar Threads

  1. E38 / E67 VATS disable guide
    By GMPX in forum E37, E38 & E67 PFI ECM's
    Replies: 141
    Last Post: March 22nd, 2023, 12:35 PM
  2. Tuning Beginners Guide
    By NASABlue in forum Gen III V8 Specific
    Replies: 0
    Last Post: September 30th, 2009, 01:37 AM
  3. Beginners guide to tuning
    By ringram in forum Tutorials
    Replies: 26
    Last Post: June 17th, 2006, 09:46 PM
  4. Draft LC-1 Guide
    By 98WS6_JPM in forum General
    Replies: 4
    Last Post: May 12th, 2006, 01:53 AM
  5. PCM tuning guide
    By 2000ssnb in forum General (Petrol, Gas, Ethanol)
    Replies: 2
    Last Post: September 3rd, 2004, 04:42 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •