DTA S40 and Mk2 Rev counter

Discussion in 'Throttle bodies & non-OEM ECUs' started by sparrow, May 31, 2008.

  1. sparrow Paid Member Paid Member

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    Is it possible to get the standard Mk2 rev counter working with a DTA ECU?

    Thanks
     
  2. Vento Mike Forum Junkie

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    Speak to Alan at DTA, I seem to remember you may have to use some kind of resistor diode set up, or try joining the DTA users forum http://dtaforum.psycode.com/ may have some luck with some clever cloggs on there!
     
  3. DarrenE Forum Member

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    pm sent
     
  4. sparrow Paid Member Paid Member

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    Right, after much faffing around, I finally got this working today.

    I used the information from this site, this diagram is at the bottom:

    [​IMG]

    Where it says "(-) side of coil X", these are the wires that run from the connector on the side of the coil.

    I got the diodes from Maplin. The two marked 1N4004DICT-ND can be found under the rectifying diodes on the Maplin site, and are labelled as 1N4004 (Maplin part number is QL76H).
    The Zener diode I'm using is a 1.3W, 18v Zener diode (Maplin part number QF59P). It's supposed to be a 1W, but Maplin don't do them. I have no idea what the difference is, and this seems to work fine. I do have the correct ones on the way though, so will see if there is any difference when they arrive.

    Thanks to all those who offered help and suggestions.

    There are two other ways that may also work.

    The first is to use 3 1N4001 resistors in the same pattern, but this didn't work on my car. I have no idea why.

    The second is to use the DTA tacho out. However, this is a digital out, so won't work directly. Below is the solution they sent me. I didn't try this, but Vince tried it and it didn't work either.
    DTATachoConnection.JPG

    Hope this helps someone out.
     
    Last edited: Aug 16, 2017
  5. Admin Guest

    funnily enough the diodes arrived from the states yesterday and i have just wired them in, all works fine.

    i thought i was revving the car to max but i still had another 2k to go! a damn my ITBs are loud when they get over 7k almost scared the **** out ofme and my brother!!!
     
  6. altern8 Forum Junkie

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    I'll try this cheers
     
  7. eazydaz Paid Member Paid Member

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    please help me,which pin on the coil is (-) side of coil? engine is AUQ

    on this coil

    [​IMG]
     
  8. Toyotec

    Toyotec CGTI Committee - Happy helper at large Admin

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    That coil is not a -ve terminal job, add diodes and tach works. Your ecu would need to have a tach out pin.
     
  9. eazydaz Paid Member Paid Member

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    how please? some scheme? what diodes and where? please help

    car is golf mk2 with auq engine..clock with tacho are original golf mk2
     
    Last edited: Sep 4, 2011
  10. badger5

    badger5 Club GTI Sponsor and Supporter Trader

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    are you saying add diodes across the coil trigger and also use the ecu tacho output?
     
  11. Toyotec

    Toyotec CGTI Committee - Happy helper at large Admin

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    No. I am saying you cannot use diodes on later (MY 2000- onwards) amplifed COP units. Tach output has to come from the ECU. DTA ECUs that you have as well as OMEX, Emerald and so on have a "low" amplified tach signal output that will need amplification to run on MK1 and MK2 Golf clusters.
    The "diode trick" is a work around on a low tach out signal, for vehicles that require a high amplified cluster signal (MK1 and MK2 GOLFs) and use a coil pack that is pre amplified and has an exposed -ve shared with ignitior.
    Coil packs that require a sparate or ECU installed ignitors: Ford/Volvo Bosch/Visteon 4 pole, Pug/Reno Sagem 4 pole and M3.8.3 1.8T (AGU, APU). These can use the diode trick to add the high energy signal from coils and read on cluster.
     
  12. sparrow Paid Member Paid Member

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    I had to reread that a few times to understand what you meant Eddie. :lol: I've translated it to:

     
  13. eazydaz Paid Member Paid Member

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    and how it can be solved?
     
  14. sparrow Paid Member Paid Member

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  15. eazydaz Paid Member Paid Member

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    but how I connected the tacho signal from ecu to mk2 clocks?
     
  16. badger5

    badger5 Club GTI Sponsor and Supporter Trader

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    does not work tho dude on mk2. works on mk3 but not mk2
     
  17. badger5

    badger5 Club GTI Sponsor and Supporter Trader

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    this works.
    :thumbup:
     
  18. sparrow Paid Member Paid Member

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    It worked on my single EDIS coil.
    Have you got it working off a coil pack?
     
  19. badger5

    badger5 Club GTI Sponsor and Supporter Trader

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    yep. working as pictured (the diode method) off the coil pack (dta supplied sagem type unit)
    its whats running in the GT30 mk2 golf.

    I sent the info to Allan @ DTA so he can share with folks who may ask him going fwd..

    thansk for sharing. Great info
     
  20. sparrow Paid Member Paid Member

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    Awesome. That's what this forum is all about. :thumbup:
     

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