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Thread: RPM limit

  1. #1
    Lifetime Member IdahoRob's Avatar
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    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
    Forum tyhee Site Admin GMPX's Avatar
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    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
    Need official EFILive help, please go here.
    For tuning support please post your questions on this forum (or other auto forums).
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  3. #3
    Lifetime Member IdahoRob's Avatar
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    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
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    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
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    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
    Forum tyhee Site Admin GMPX's Avatar
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    Some logs would help if possible Rob, I'd like to see what the Main mm3 is dropping to if possible.

    Cheers,
    Ross
    Need official EFILive help, please go here.
    For tuning support please post your questions on this forum (or other auto forums).
    Sorry if I don't respond to your PM, don't take it personal.


  7. #7
    Lifetime Member IdahoRob's Avatar
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    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
    Forum tyhee Site Admin GMPX's Avatar
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    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
    Need official EFILive help, please go here.
    For tuning support please post your questions on this forum (or other auto forums).
    Sorry if I don't respond to your PM, don't take it personal.


  9. #9
    Lifetime Member IdahoRob's Avatar
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    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
    Forum tyhee Site Admin GMPX's Avatar
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    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
    Need official EFILive help, please go here.
    For tuning support please post your questions on this forum (or other auto forums).
    Sorry if I don't respond to your PM, don't take it personal.


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