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Thread: LBZ/LMM DSP speed limit option

  1. #1
    Lifetime Member bobo's Avatar
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    Default LBZ/LMM DSP speed limit option

    Just had a request from an overseas customer to limit speed based on DSP position. How hard would it be to add this to the LBZ and LMM (at least in a DSP2 OS)? There is a new law that limits vehicles speed to 89kph in newer vehicles in his country.
    2005 Twin Turbo Dmax/Allison Ext. Cab Short Box 4X4
    Best 1/4 11.8 @ 118+ on #2 only

    Twisted Diesel Tuning-The leader in Duramax Tuning Services and soon to offer Common Rail Cummins Tuning!

    Bobotune at rocketmail dot com

  2. #2
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    89kph?! Wow, thats slow! Is it even safe? 55mph, you cant get out of your own way on a highway if something happens.

    I understand the request though, hopefully you can figure something out!
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, tuned, turbo mods, etc.
    2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
    2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.

  3. #3
    Lifetime Member Boost's Avatar
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    '12 Caprice PPV 6.0 L77 - daily transportation
    8.7 @ 84 (1/8 mile) bolt-ons

    '02 Silverado RCSB 5.3 L59 - regularly street driven
    8.2 @ 86 (1/8 mile) stock cam and spray
    8.6 @ 84 (1/8 mile) cam and heads no spray

    Our YOUTUBE CHANNEL featuring the Silverado

  4. #4
    Lifetime Member GMC-2002-Dmax's Avatar
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    I don't think Ross will be revisiting that anytime soon, have your customer use the Cruise Control or learn self restraint to keep his speeds down.

    The original DSP2/LB7 & LLY tunes had the speed limit option and I don't think anyone ever used them so I am sure when we beta tested them 5 years ago a decision was made to ditch it in the DSP5 calibrations.

    Just my opinion on it.

    Maybe Ross will consider it, but I thought he stated that he wasn't revisiting the DSP5/OS's anytime soon.
    www.mscservices.net


    Tuner of many, many Duramax and Cummins Diesels.


  5. #5
    Lifetime Member GMPX's Avatar
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    Yeah sorry Bobo, whilst it's probably not that big of a deal to add just one simple calibration to the DSP OS's, it means we have to do a lot of work to ensure the change isn't going to make the old versions incompatible. Changes like that across all OS's, with testing etc is in reality about 4 - 5 days work. I know it sounds crazy, but there is a lot of double checking and confirmations that need to be done when modifying OS's to ensure we aren't going to cause major problems somewhere.
    That is why when we are finalising the Cummins switchable tuning we need to make sure everything is covered first time.

    By the way, what country limits vehicles to 89 KMH? That is insane.

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

  6. #6
    Lifetime Member Boost's Avatar
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    If they keep voting for assclowns, it may very well be the good ole' USA soon lol...
    '12 Caprice PPV 6.0 L77 - daily transportation
    8.7 @ 84 (1/8 mile) bolt-ons

    '02 Silverado RCSB 5.3 L59 - regularly street driven
    8.2 @ 86 (1/8 mile) stock cam and spray
    8.6 @ 84 (1/8 mile) cam and heads no spray

    Our YOUTUBE CHANNEL featuring the Silverado

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