72 cuda rallye dash tach problem

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    Author Topic: 72 cuda rallye dash tach problem  (Read 3529 times)

    Offline cudaneil

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    72 cuda rallye dash tach problem
    « on: January 25, 2009 - 03:59:32 PM »

       Hello again guys,
                              My tach is working but is reading very low.  At idle it reads correct or very near, but when you rev the motor it only moves as far as  3000 rpm .

                 Just as if its being lazy and cant be bothered !!!       :clueless:       Any ideas  ?



                                                                              :cheers:  Cudaneil
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    Offline MEK-Dangerfield

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    Re: 72 cuda rallye dash tach problem
    « Reply #1 on: January 25, 2009 - 04:24:54 PM »
    This is one I haven't heard before.   :screwy:

    So you idle at 700-800 RPM? I assume you are driving the car when you are testing it, so it doesn't get above 3000 even when you floor it? It's possible it needs rebuilt if that is the case.


      Mike
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    Mike

    1970 Challenger - SOLD
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    Offline Chryco Psycho

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    Re: 72 cuda rallye dash tach problem
    « Reply #2 on: January 25, 2009 - 11:21:05 PM »
    the electronics were not very advanced in 69 , get the RTE circuit board & solder it in it will be far more accurate
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    Offline cudaneil

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    Re: 72 cuda rallye dash tach problem
    « Reply #3 on: January 26, 2009 - 04:06:02 AM »

        Hi, Can you tell me more about the RTE circuit board,and where can i get one from ?


                                          Thanks,   Cudaneil.            :england:
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    Offline thedodgeboys

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    Re: 72 cuda rallye dash tach problem
    « Reply #4 on: January 26, 2009 - 04:41:05 AM »
    Quote from: cudaneil on January 26, 2009 - 04:06:02 AM
        Hi, Can you tell me more about the RTE circuit board,and where can i get one from ?


                                          Thanks,   Cudaneil.            :england:


    http://rt-eng.com/mediawiki/index.php/RTE_67-74_Tach_kit

     :thumbsup:
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    Offline cudaneil

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    Re: 72 cuda rallye dash tach problem
    « Reply #5 on: January 26, 2009 - 08:12:09 AM »
    Quote from: thedodgeboys on January 26, 2009 - 04:41:05 AM
    http://rt-eng.com/mediawiki/index.php/RTE_67-74_Tach_kit

     :thumbsup:



                                Many Thanks TDB.................... :2thumbs:         :cheers:   Cudaneil. 
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    Offline 73EStroker

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    Re: 72 cuda rallye dash tach problem
    « Reply #6 on: January 26, 2009 - 10:47:25 PM »
    Plus you need to purchase their tach excerciser to calibrate the tach $35. Unless you have a machine (like an oscilloscope) that outputs a square wave pulse at a known rate. Otherwise you will be revving the engine up and down for hours. The excerciser also (go figure) excercises the bearings by moving the needle up to full scale and back to idle. This frees the needle up. I excercised mine overnight.
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    Barry (Salmon Arm)

    Offline cudaneil

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    Re: 72 cuda rallye dash tach problem
    « Reply #7 on: January 27, 2009 - 05:40:02 AM »

           Hi stroker,  Thanks for the info..............but i am getting worried about Rt-Engineering because i have bought and paid for an electronic dash voltage stabiliser from them


                through the website.   Cost  $60  and have had no reply from them !    so i emailed them and the email was returned saying " known spammer"


                                                       cheers.............a worried CUDANEIL   :eek7:
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    Offline thedodgeboys

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    Re: 72 cuda rallye dash tach problem
    « Reply #8 on: January 27, 2009 - 06:42:17 AM »
    try calling them on the phone Apparently they have had problems in the past with that, From there site.
    http://rt-eng.com/mediawiki/index.php/RTE:About

    Here are some other alternate email addresses you can use in case you find that our main email address is not working (typically because of spam filters):
    mailto:ggarner@arkansasusa.com
    mailto:greg@rt-eng.com
    mailto:funcarnut@gmail.com

    Dash-worx, a division of
    Real Time Engineering
    19352 Hilton Rd.
    Springdale, AR 72764
    1-479-756-2757
    1-479-756-3917 Fax
    http://www.rt-eng.com



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    Offline cudaneil

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    Re: 72 cuda rallye dash tach problem
    « Reply #9 on: January 27, 2009 - 07:16:23 AM »

          OK thanks tdb.   :thumbsup:
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    Offline inviolet

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    Re: 72 cuda rallye dash tach problem
    « Reply #10 on: June 16, 2009 - 03:25:30 PM »
    I have a 70 Cuda with a lazy tach too. Its a rally dash tach and its running off a MSD 6AL with a MSD Ignition 8920 tach adapter. At idel The tach shows the rpm fine, but when you rev up the motor the tach is lazy/delayed. I called MSD and they said one possible fix is too add a capacitor 0.01µF 1 k Volt between the MSD Ignition 8920 tach adapter and the tach.

    Any one have a similar issue?
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    Offline Bills70

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    Re: 72 cuda rallye dash tach problem
    « Reply #11 on: June 16, 2009 - 03:57:39 PM »
    Quote from: inviolet on June 16, 2009 - 03:25:30 PM
    I have a 70 Cuda with a lazy tach too. Its a rally dash tach and its running off a MSD 6AL with a MSD Ignition 8920 tach adapter. At idel The tach shows the rpm fine, but when you rev up the motor the tach is lazy/delayed. I called MSD and they said one possible fix is too add a capacitor 0.01µF 1 k Volt between the MSD Ignition 8920 tach adapter and the tach.

    Any one have a similar issue?
    I know that cudas and challengers are similar, I wonder if this would solve my problem!  I have the MSD street fire boxwith the tach adapter and the tach in my rally cluster doesnt work at all? It is also possible that the shop that installed the MSD screwed it up!
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