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Thread: Using delay box timer, relay and retard box to slow down

  1. #1
    Senior Member DYNO OPERATOR
    Join Date
    Jan 2004
    Location
    central Illinois
    Posts
    459

    Using delay box timer, relay and retard box to slow down

    Has anyone used a retard box to slow a car down instead of a throttle stop??

    I am thinking of using a timer on my Mega 450 delay box to activate a relay to turn on a MSD retard box with enough retard and time to slow a 3000# BBC door car from 6.30 to above 6.40 ET in 1/8 mile (No license for faster than 6.40 ET) . I want to do this while in high gear and then turn it back off in time to have full power before the lights.

    The delay box puts out 12 VDC and the retard box wants to see ground broken to turn on the relay, so that's why the relay would be needed.

    I am thinking about taking out 10 degrees for 1.5 seconds initially, but wonder if the 1050 carb will flood the engine or any other negative side effects.

  2. #2
    Member MASTER JOURNEYMAN
    Join Date
    Jan 2008
    Location
    Brandon MS
    Posts
    47
    It will work you will just have to play with it to get it slowed down where you need it. As you know the sooner you kill the timing the more it will slow. My car when running 6.50 would slow to 7.00 by killing timing, shift point and a plate under carb like NASCAR uses. I used the shift point to speed up or slow down.

  3. #3
    Senior Member RACING JUNKIE
    Join Date
    May 2003
    Location
    Coldwater, MI
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    2,998
    just shift it earlier easy to kill that much.
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
    419-280-1406
    Lanning Electric
    Complete Drag Car Wiring
    APD Race Engines
    www.apdracing.com

  4. #4
    Senior Member DYNO OPERATOR
    Join Date
    Jan 2004
    Location
    central Illinois
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    459

    using delay timer

    Thanks for the comments guys. I have dropped shift point from 7400 to 6800. When I tried 6400 it hit so really hard at the shift I just didn't like it.
    I reduced the timing from 38 to 34. I reduced the start RPM from 4600 to 4000. Finally I just cranked the bolt stop under the pedal up until it killed .10 second in 60 ft, but the mph stayed the same. Then the throttle linkage started slipping by the stop bolt. Now I have it back to full throttle.
    This week I will try out the timing retard system I have installed.
    Initial setting is retard 6 degrees at 3.5 seconds until 5.5 seconds for a 1/8 mile track.

  5. #5
    Senior Member DYNO OPERATOR
    Join Date
    Jan 2004
    Location
    central Illinois
    Posts
    459

    using delay box

    Just thought I would let you know that the delay box/timed retard works OK. Need to shift by time though to be sure it retards after shift.

    It killed about .10 second and thats what I needed.

  6. Racing Junk


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