Results 1 to 7 of 7

Thread: E38 LS7 Throttle hanging at ~35% while at WOT between quick manual WOT shifts!

  1. 09-23-2014 #1
    88LS7MonteSS
    88LS7MonteSS is offline
    Tuner in Training
    Join Date
    Jun 2006
    Posts
    32

    E38 LS7 Throttle hanging at ~35% while at WOT between quick manual WOT shifts!

    Took my car out to the track again only to still have issues between shifts....if I shift fast (not power shifting) the throttle body will only open to ~35/36% after I stab the throttle for the next shift and it just hangs there until I literally let off the throttle and stab it again and then it goes like nothing happened! Enclosed is the only scan I could get shifting 1st to 2nd gear and then 2nd to 3rd gear. Anyone else ever have issues with fast shifting and the E38 PCM? Rev limiter/Cutoff is set to 8192 RPM (I have a solid roller with NW 102TB). Car is 680RWHP N/A, enclosed is the tune and run file.
    Attached Files Attached Files
    Reply With Quote Reply With Quote
  2. 09-24-2014 #2
    SultanHassanMasTuning
    SultanHassanMasTuning is offline
    Senior Tuner SultanHassanMasTuning's Avatar
    Join Date
    Nov 2009
    Location
    All Around
    Posts
    3,149
    did you try to increase the switchover under fuel ETC E40 PCM has it set to 255
    Follow @MASTUNING visit www.mastuned.com
    Remote Tuning [email protected]
    Contact/Whatsapp +966555366161
    Reply With Quote Reply With Quote
  3. 09-24-2014 #3
    88LS7MonteSS
    88LS7MonteSS is offline
    Tuner in Training
    Join Date
    Jun 2006
    Posts
    32
    did you try to increase the switchover under fuel ETC E40 PCM has it set to 255
    No....where is this tab?
    Reply With Quote Reply With Quote
  4. 09-25-2014 #4
    SultanHassanMasTuning
    SultanHassanMasTuning is offline
    Senior Tuner SultanHassanMasTuning's Avatar
    Join Date
    Nov 2009
    Location
    All Around
    Posts
    3,149
    under Fuel Cut Tab where you select if you want ETC or Fuel or Ignition cut
    Follow @MASTUNING visit www.mastuned.com
    Remote Tuning [email protected]
    Contact/Whatsapp +966555366161
    Reply With Quote Reply With Quote
  5. 09-26-2014 #5
    MikeOD
    MikeOD is offline
    Senior Tuner
    Join Date
    Sep 2008
    Posts
    1,668
    Like he said, under Engine - Fuel - Cutoff, DFCO, look for "Control Method" and set ETC to disabled...set Spark or Fuel to enabled, your choice. After that, right below those 3 choices there's "Switchover". Open that and set the entire table to something like 20 or higher across the board.
    2010 Camaro SS M6. Stock Bottom End, Heads/Cam/Intake/Headers/Exhaust.
    2005 Silverado RCSB. Forged 370 LQ9/Borg-Forced Inductions T6 S484/Jake's Stage 4 4L80E with D3 Brake/4WD.
    2023 Durango Hellcat
    Reply With Quote Reply With Quote
  6. 09-26-2014 #6
    88LS7MonteSS
    88LS7MonteSS is offline
    Tuner in Training
    Join Date
    Jun 2006
    Posts
    32
    Found it, thanks guys....now I just need dry pavement to try the changes! Has anyone else experienced this before?
    Reply With Quote Reply With Quote
  7. 09-28-2014 #7
    88LS7MonteSS
    88LS7MonteSS is offline
    Tuner in Training
    Join Date
    Jun 2006
    Posts
    32
    I strapped the car down on the chassis dyno to make some controlled runs and was able to replicate the issue by shifting very fast from 3rd to 4th gear. I changed the value on the control method from 5 to 50 and appears the issue is gone, thanks guys! Now it appears that I may have an unintended consequence as a result...I noticed that instead of the fuel cut-off shutting the motor off where I had it set at 7900 RPM that the motor went past 8000RPM and didn't stop until I took my foot off the gas What's up with this now......does this somehow defeat the fuel cut-off entirely?
    Reply With Quote Reply With Quote
« Previous Thread | Next Thread »