Results 1 to 5 of 5

Thread: Speedometer help

  1. #1
    New Member
    Join Date
    Jun 2018
    Posts
    6

    Default Speedometer help

    So now that I got my tunes in, and it's working great, and I received the actual tune names from Longhorn, I'm on my way. However, about 5 years ago I installed a little larger of a tire on the truck. I now run 265 75R16's on it. The stock tires were so small for the truck. Anyways, my speedometer has always been about 2-4 miles an hour fast since then, depending on my road speed. I was excited to learn that I could adjust this with the AutoCal, and thought they had done it for me, but it doesn't seem to be.

    I have v8 and v7.5 loaded on my computer and watched many videos and read posts on this, but can't seem to get to where I'm at now. I opened up the tuning file, named 0022.ctz (in 7.5), and entered in my new tire size, and the numbers definitely changed in the right direction. I saved it as 0023.ctz. Now, how do I get it to the AutoCal device? I can't seem to find out how to get it there. When I look at the AutoCal unit itself, it has either Prog1 (DSP5.ctz), or Full1 (DSP5.ctz). I also can't seem to find DSP5.ctz on my computer. It also prompted me to plug in my AutoCal device, but it already was plugged in! Not sure how to get the 0023 file to the unit so I can reflash, and keep the tunes that I already have loaded.

    Help?

  2. #2
    New Member
    Join Date
    Jun 2018
    Posts
    6

    Default

    UPDATE—found the DSP5 file in EFlive explorer. Copied it to my desktop. Looks like the 0022.ctz was a read file under the tune name DSP5. When I tried to open DSP5 in V7.5, it said it was flagged as private and gave them I used V8 (which I have). When I open in V8, I get a screen that there are security restrictions active, and the calibrations cannot be viewed or modified.

  3. #3
    Lifetime Member
    Join Date
    Mar 2006
    Posts
    4,778

    Default

    You would need to ask Longhorn to provide you with an updated tune file. Even if you could modify your existing tune, in order to flash it with your AutoCal it MUST be saved with Longhorn's FlashScan V2 serial embedded (which only can happen if they save it).
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, starting the mods
    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.

  4. #4
    Diesel Forum Support Site Admin
    Join Date
    Nov 2005
    Posts
    1,706

    Default Speedometer help

    AutoCal gives users the ability to flash tunes written and secured by a particular tuner. It does not give end users the ability to modify tunes. AutoCal also prevents end users from switching tuners unless the original tuner chooses to release the device.
    Last edited by cindy@efilive; June 12th, 2018 at 09:29 AM. Reason: Post cut off

  5. #5
    Diesel Forum Support Site Admin
    Join Date
    Nov 2005
    Posts
    1,706

    Default Speedometer help

    Only the tuner who

Similar Threads

  1. Speedometer.
    By Chevy 97 in forum Gen III V8 Specific
    Replies: 7
    Last Post: January 9th, 2017, 08:51 PM
  2. Speedometer.
    By Chevy 97 in forum FlashScan V2
    Replies: 6
    Last Post: January 9th, 2017, 08:15 PM
  3. Speedometer signal
    By Hocky in forum Gen III V8 Specific
    Replies: 12
    Last Post: June 29th, 2009, 10:14 AM
  4. problem with the speedometer
    By odd boy in forum General (Petrol, Gas, Ethanol)
    Replies: 6
    Last Post: May 20th, 2008, 11:44 AM
  5. Problem with speedometer
    By mrialsm4 in forum Gen IV V8 Specific
    Replies: 6
    Last Post: February 21st, 2008, 07:38 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
  •