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Thread: Cruise control

  1. #1
    Member Astrav6's Avatar
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    astra couple convertible mk4

    Cruise control

    Hi
    Does anyone know if it's possible to reprogram the cruise control ratios on a mk4 astra?
    I have change the gearbox to the six speed and all was working as normal. I have now replaced the sixth gear with a different ratio to reduce the revs but the downside of doing this is that the cruise control now only works in the first five gears :-( so I'm assuming there is a table in the ecu with a speed to rev limit and the new gearing is outside this

    Dave

    Sent from my E6633 using Tapatalk


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    • #2
      VIP+ soulman's Avatar
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      As far as I am aware no such setting like that exists

    • #3
      Member KicOPC's Avatar
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      YOu are correct, road speed by RPM calibration table is in the ECU Flash/Map.

      You need a tuner who has access to a DAMOS file for your ECU so he can re-calibrate the maps.

      Difficult to find someone willing to do this job as it is rarely required and you need a deep understanding of the internal ECU
      structure, function and calibration logic.

      To help you understand here is some explanation of the ME7 ECU from an Audi:
      https://s4wiki.com/wiki/Tuning#Gear_detection

      And here is a Bosch document (translated) explaining ECU calibration workflow and items:
      http://files.s4wiki.com/docs/ME-7.3....dDataSheet.pdf

      1327 pages long, so you can understand why good tuners charge so much for a remap.

    • #4
      Member Astrav6's Avatar
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      Thanks for the info I'll have a look later

      Is the map only accessible via a tech2 or are there any other systems to allow access

      Dave

      Sent from my E6633 using Tapatalk

    • #5
      Member KicOPC's Avatar
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      No diagnostic tool can help you with this.
      You need chip tuning tools.
      You go about this as you would remaping.

    • #6
      Member Astrav6's Avatar
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      Ok thanks

      I've done remapping on my bikes but not on the car. What's the best interface/kit to get for the Vauxhall?

      Sent from my E6633 using Tapatalk

    • #7
      Member KicOPC's Avatar
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      Depends on your budget but i presume you are not willing to spend 4000€ for a genuine tuning tool.
      Clones are a risk so have a failover plan (ability to recover from a failed flash with Tech2 or a tool that can recover bricked ECUs)
      Galletto, MPPS, Alientech, all should be able to write GM ECUs.

      You need an editing software, definition files (damos/A2L).... Best start googling stuff.
      There is a long road infront of you if you decide to do this yourself.

      You did not tell us which engine you have?

    • #8
      Member Astrav6's Avatar
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      Hi

      Thanks for the info

      It's a z20let

      Dave

      Sent from my E6633 using Tapatalk

    • #9
      Member KicOPC's Avatar
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      There are a few German damos nad. ols files floating around the internet for ME1.5.5 (Z20LET).
      Just Google it, you will find them.

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