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Thread: How To: install GPS based speedometer drive

  1. #21
    Member
    Join Date:  Sep 2016

    Location:  Cardiff

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    My VIN:    11789

    Quote Originally Posted by CFI View Post
    After these modifications the buzzer will no longer function. There is no point in plugging it back in. There is no downside, other than you’ll have no buzzer. It affects nothing else.
    OK thanks for the really quick answer.
    I'm trying to trouble shoot a problem on the binnacle lights.

    I removed the binnacle - had my speedo rebuilt and whilst at it got LED bulbs - except the incandescent one for the alternator.

    I tested each LED bulb and marked each bulb so I knew which side of the bulb was positive and negative.

    Next I used a simple battery powered continuity tester on the binnacle Flexi PCB and marked what (I thought) were grounds

    Now, the only binnacle led bulbs that work are the ones that come on with the side lights (Dimmer is therefore turned up full ... because of the knock on LED dimmer problem).

    The incandescent bulb no longer works neither does the oil light ...... thats why I was wondering if the unplugged multiplug I asked about ... was causing a continuity problem?

    Edit - Thinking out loud - I should check the fuse box !!! It's late here ..... I'll check it tomorrow ... this car is fighting me grrrr!
    Last edited by SpudMurphy; 04-22-2020 at 05:26 PM.
    Currently resurrecting Vin # 11789 - One of the batch of 50 exported to the Middle East in 1982.

  2. #22
    LS Swapper Josh's Avatar
    Join Date:  Mar 2013

    Location:  SK, Canada

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    Quote Originally Posted by CFI View Post
    After these modifications the buzzer will no longer function. There is no point in plugging it back in. There is no downside, other than youíll have no buzzer. It affects nothing else.
    this is not entirely true. Unplugging the buzzer will also make the seatbelt light on the dash no longer function.

    5.3L LS4 + Subaru 6spd 314whp/348ft-lbs
    Getting it back on the road!
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  3. #23
    Junior Member Dhennick99's Avatar
    Join Date:  Jun 2011

    Posts:    24

    The little internal piece of the cable keeps sliding out of the square portion where the cable screws into the speedbox. There's not alot of slack to really feed it in before tightening everything up. Any tips or suggestions?

  4. #24
    Junior Member Dhennick99's Avatar
    Join Date:  Jun 2011

    Posts:    24

    20200514_144128.jpg

    I mounted the speedbox right under the lambda counter
    It's working nicely now.

  5. #25
    LS Swapper Josh's Avatar
    Join Date:  Mar 2013

    Location:  SK, Canada

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    My VIN:    11408

    Club(s):   (TXDMC) (DOI)

    I was thinking of designing up a 3d printed bracket that bolts in place of the lambda box bracket but interfaces with the speedbox. would anyone be interested in that?

    5.3L LS4 + Subaru 6spd 314whp/348ft-lbs
    Getting it back on the road!
    LS Swap

  6. #26
    Senior Member
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    Does the speedometer needle still bounce at lower speeds after switching over to the speedbox and eliminating the angle drive? Or is the bounce inherent to the use of a cable at all?

    How fast does it pick up a signal if you donít have it wired for constant power?

    How significant of a tunnel do you lose the signal in? Any other locations itís less than perfect?
    5 speed, grooved hood, grey interior (Nov '81)
    QA1 coilovers, Delorean.eu LCA brackets, DPNW Poly swaybar bushings, DMCMW shock tower bar, Deloreana.com convex mirrors, DPNW Toby Tabs, DPI exhaust, C4 Corvette third brake light, PJ Grady tail light boards, Bitsyncmaster relays

  7. #27
    Senior Member
    Join Date:  Aug 2018

    Location:  Virginia

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    Quote Originally Posted by jackb View Post
    Does the speedometer needle still bounce at lower speeds after switching over to the speedbox and eliminating the angle drive? Or is the bounce inherent to the use of a cable at all?

    How fast does it pick up a signal if you donít have it wired for constant power?

    How significant of a tunnel do you lose the signal in? Any other locations itís less than perfect?
    I donít notice any bouncing, but the needle does tend to jump up a little when you start moving. Itís definitely smoother than a stock setup.

    I believe the instructions indicate that it may take up to 1 minute for satellite acquisition if it is not wired for constant power. Itís worth setting up constant power though. Itís not difficult, the speedometer will work immediately, and the power draw is tiny. If this thing kills your battery you have some very serious electrical system problems.

    As far as losing signal, almost anytime you drive under a bridge youíll notice a slight speed adjustment when you exit the other side. Your speed wonít go to zero, it will stay at whatever your last recorded speed was until satellite re-acquisition (which is immediate once the antenna has a clear view of the sky). The downside to this is if you get stuck in traffic in a tunnel (or under a bridge) your odometer will continue clicking away even though youíre not moving. Itís possible that after so many minutes the device would realize whatís going on and set the speed to zero, but Iím not sure. We have lots of bridges and tunnels where I live and Iíve never been stuck without a satellite signal for very long.

    As far as other problematic locations, I would guess that driving on a narrow road with lots of thick tree cover might be problematic. Or in a deep valley. Iím not sure youíd really notice though, as again the speed doesnít go to zero. It just varies slightly as the signal is lost and re-acquired.

    Iíve had mine installed for 15 months, some 6,000 ish miles and itís been absolutely perfect.
    DMCF rebuild 2008, Stage II, Eibach

  8. #28
    Junior Member DeLoreanTech's Avatar
    Join Date:  Jun 2018

    Location:  Orange County, CA

    Posts:    6

    My VIN:    16109

    Installed the SpeedBox in this '81 DeLorean using the instructions here on DMCTalk...complete success and the unit works great!

    Video link (feedback appreciated)

    https://youtu.be/0lhf0LE3OZM

  9. #29
    Senior Member
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    Location:  Virginia

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    Quote Originally Posted by DeLoreanTech View Post
    Installed the SpeedBox in this '81 DeLorean using the instructions here on DMCTalk...complete success and the unit works great!

    Video link (feedback appreciated)

    https://youtu.be/0lhf0LE3OZM
    Awesome! Glad I could help.
    DMCF rebuild 2008, Stage II, Eibach

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