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Thread: Speedo Corrector Installation for Series II Disco

  1. 26th April 2010, 08:39 PM #1
    GrahamH's Avatar
    GrahamH
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    Speedo Corrector Installation for Series II Disco

    I'm wondering if anyone has fitted a speedometer corrector to a Series II Disco (the Silicon Chip project from Dec 2006 - which Jaycar sell as Kit KC5435, for example). If so, what I'm interested in is:
    - Where did you mount the unit?
    - Where did you pick up the signal from the speed sensor to the speedo?

    I'm quite comfortable with the electronics involved here (and I have the RAVE CD for the wiring diagram), but as I've only recently bought the vehicle (2003 TD5) I haven't had any experience taking the dash and instrument binnacle apart yet so any advice you can give me before I commence surgery would be welcome.

    The car currently has 265x75x16 tyres so it's speedo is reading 10% low and I'd like to make it correct at 100kph but as I intend to change the tyres to something a little smaller in 6 months or so I want the flexibility to tweak it again to suit whatever I put on. This makes the Silicon Chip project quite attractive.

    Thanks in advance.

    (I have done a search and checked out all 14 pages of Tutorials without finding anything but feel free to correct me if this has been covered previously.)
    GrahamH
    '65 SIIa 88" Hard-top, Rego DW622, 186 Holden, 4.3 diffs (she's still back in NZ)
    '88 4-door Rangie (long gone)
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  2. 26th April 2010, 08:42 PM #2
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    Slunnie
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    www.slunnie.com :: View topic - Truespeed speedo correction installation
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    Slunnie


    ~ Discovery II Td5 ~ Discovery 3dr V8 ~ Series IIa 6cyl ute ~ Series II V8 ute ~
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  3. 1st May 2010, 07:11 AM #3
    bitdist
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    Most don't work and I seem to remember someone trying the jaycar one a few years ago without sucess. From memory the problem is that there is a low hertz (5 ?? - can't really remember) squarewave runnning through the system and if the correction unit blocks that, then the speedo will not work at all.
    I have a truspeed one as well which works fine, but costs a lot more than the Jaycar one would have

    cheers
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  4. 1st May 2010, 09:41 AM #4
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    Slunnie
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    That right, A 1hz baseline diagnostic frequency that always passes through as a minimum.
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    Slunnie


    ~ Discovery II Td5 ~ Discovery 3dr V8 ~ Series IIa 6cyl ute ~ Series II V8 ute ~
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  5. 4th January 2012, 05:32 PM #5
    Geeman
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    Sorry to start this thread up again, would the Truespeed Speedo correction box work on 1994 range rover classic soft dash?
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