Page 1 of 10 123 ... LastLast
Results 1 to 10 of 92

Thread: RPM limit

  1. #1
    Lifetime Member IdahoRob's Avatar
    Join Date
    Apr 2006
    Posts
    736

    Default RPM limit

    My 07 LBZ has a 3500 RPM limit on it. Anyone know where to play with the tunes to remove this or raise it.

    Thanks,
    Rob

  2. #2
    Lifetime Member GMPX's Avatar
    Join Date
    Apr 2003
    Posts
    13,148

    Default

    B1122 is more than likely the problem, it will limit the fuel amounts to 30mm3 at and above 3500RPM, though, because of the table interpolation the limiting will probably start to kick in at around 3300 - 3400RPM.
    If you raise the values in that table at the higher RPM the value will be carried through to higher RPM's (the table ends at 3500). You also need to look at B1117, B1118 & B1119.

    Cheers,
    Ross
    I no longer monitor the forum, please either post your question or create a support ticket.

  3. #3
    Lifetime Member IdahoRob's Avatar
    Join Date
    Apr 2006
    Posts
    736

    Default

    I figured those tables would be the ticket. I'll try adjusting those today and testing.

    I was also looking at the "pedal pos. to desired torque" table. Torque starts falling off at 3250rpm's and goes to 0 at 3550rpm

    Ross, what is the difference between B1118 and B1119?

    Thanks,
    Rob
    Last edited by IdahoRob; February 28th, 2007 at 10:55 AM.
    2013 LML, 550hp with factory emissions, stock cp4 and compound turbos.
    2002 LBZ, 4x4 (Max'd Out) 6000lbs 9.36 @ 154 mph NHRDA Champion and Record holder
    1965 El Camino, duramax 9.6 @ 149MPH

    All EFI tuned by Adrenaline Truck Performance

  4. #4
    Lifetime Member IdahoRob's Avatar
    Join Date
    Apr 2006
    Posts
    736

    Default

    OK, a little update.

    I modded the B1118 and B1119 and still hit the 3500rpm limiter. I then modded those as well as "pedal pos. to desired torque" table and still have the RPM limiter.

    I logged the runs, but haven't had time to look at them.

    I'm not sure where to go from here.

    EDIT: Dooouuuh, I forgot to mod the B1122 also. I'll do that and see.

    Thanks,
    Rob
    2013 LML, 550hp with factory emissions, stock cp4 and compound turbos.
    2002 LBZ, 4x4 (Max'd Out) 6000lbs 9.36 @ 154 mph NHRDA Champion and Record holder
    1965 El Camino, duramax 9.6 @ 149MPH

    All EFI tuned by Adrenaline Truck Performance

  5. #5
    Lifetime Member IdahoRob's Avatar
    Join Date
    Apr 2006
    Posts
    736

    Default

    Well even with the B1122, B1118, B1119 modded I still have the 3500rpm limit.

    Any thoughts?

    Thanks
    2013 LML, 550hp with factory emissions, stock cp4 and compound turbos.
    2002 LBZ, 4x4 (Max'd Out) 6000lbs 9.36 @ 154 mph NHRDA Champion and Record holder
    1965 El Camino, duramax 9.6 @ 149MPH

    All EFI tuned by Adrenaline Truck Performance

  6. #6
    Lifetime Member GMPX's Avatar
    Join Date
    Apr 2003
    Posts
    13,148

    Default

    Some logs would help if possible Rob, I'd like to see what the Main mm3 is dropping to if possible.

    Cheers,
    Ross
    I no longer monitor the forum, please either post your question or create a support ticket.

  7. #7
    Lifetime Member IdahoRob's Avatar
    Join Date
    Apr 2006
    Posts
    736

    Default

    Ross,

    I sent a couple logs. Hope it went to the right place (support@efilive)

    Looks like the main flow rate drops a bunch and the turbo vane position goes to 0 for a bit. Any way to mod the flow rate and duration like the old platform?

    Thanks a bunch,
    Rob
    2013 LML, 550hp with factory emissions, stock cp4 and compound turbos.
    2002 LBZ, 4x4 (Max'd Out) 6000lbs 9.36 @ 154 mph NHRDA Champion and Record holder
    1965 El Camino, duramax 9.6 @ 149MPH

    All EFI tuned by Adrenaline Truck Performance

  8. #8
    Lifetime Member GMPX's Avatar
    Join Date
    Apr 2003
    Posts
    13,148

    Default

    Thanks Rob, I got the logs.
    I forgot to ask, did you change the upper RPM cols in B1115 & B1116? I only ask because on a stock LBZ the desired torque figures plumet between 3250 and 3500 RPM (which will drop the main mm3 numbers), just like your commanded fuel drops from around 80mm3 down to 28mm3 over a similar RPM span.

    Cheers,
    Ross
    I no longer monitor the forum, please either post your question or create a support ticket.

  9. #9
    Lifetime Member IdahoRob's Avatar
    Join Date
    Apr 2006
    Posts
    736

    Default

    Quote Originally Posted by GMPX
    Thanks Rob, I got the logs.
    I forgot to ask, did you change the upper RPM cols in B1115 & B1116? I only ask because on a stock LBZ the desired torque figures plumet between 3250 and 3500 RPM (which will drop the main mm3 numbers), just like your commanded fuel drops from around 80mm3 down to 28mm3 over a similar RPM span.

    Cheers,
    Ross
    I did change B1115 and B1116 Ross. Thats what is bugging me. I can't seem to control it with any of the available tables.

    Thanks for your help.
    2013 LML, 550hp with factory emissions, stock cp4 and compound turbos.
    2002 LBZ, 4x4 (Max'd Out) 6000lbs 9.36 @ 154 mph NHRDA Champion and Record holder
    1965 El Camino, duramax 9.6 @ 149MPH

    All EFI tuned by Adrenaline Truck Performance

  10. #10
    Lifetime Member GMPX's Avatar
    Join Date
    Apr 2003
    Posts
    13,148

    Default

    Quote Originally Posted by IdahoRob
    I can't seem to control it with any of the available tables.

    Thanks for your help.
    Well, that's what you get for trying to rev it like a gasser .
    Did you notice if the logged torque value also dropped?
    I'll keep looking I guess.

    Cheers,
    Ross
    I no longer monitor the forum, please either post your question or create a support ticket.

Page 1 of 10 123 ... LastLast

Similar Threads

  1. 100 log limit????
    By hquick in forum General
    Replies: 9
    Last Post: February 4th, 2009, 07:08 AM
  2. LLY MAP Limit?
    By Cougar281 in forum Duramax LLY
    Replies: 1
    Last Post: September 14th, 2008, 12:11 AM
  3. Is there a limit?
    By horsehaulin in forum General (Diesel)
    Replies: 5
    Last Post: June 16th, 2008, 07:28 PM
  4. Limit WOT with ETC ???
    By Ninety8C5 in forum General (Petrol, Gas, Ethanol)
    Replies: 1
    Last Post: May 18th, 2008, 02:08 AM
  5. HP limit?
    By 80superbu in forum General (Petrol, Gas, Ethanol)
    Replies: 2
    Last Post: April 1st, 2006, 10:00 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
  •