DIGITAL DELAY 1023-SCR User manual

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2036 Fillmore Street
Davenport, Ia. 52804
563-324-1046
www.racedigitaldelay.com
1023-SCR
WARRANTY AND DISCLAIMER
DIGITAL DELAY INC. WARRANTS THE PRODUCTS IT
MANUFACTURES AGAINST DEFECTS IN MATERIALS AND WORKMANSHIP
FOR A PERIOD LIMITED TO 1 YEAR FROM THE DATE OF SHIPMENT,
PROVIDED THE PRODUCTS HAVE BEEN STORED, HANDLED, INSTALLED,
AND USED UNDER PROPER CONDITIONS.
The company’s liability under this limited warranty shall extend only to the
repair or replacement of a defective product, at the company’s option. DIGITAL DELAY
INC. disclaims all liability for any affirmation, promise, or representation with respect to
the products.
The customer agrees to hold DIGITAL DELAY INCORPORATED harmless
from, defend, and indemnify DIGITAL DELAY INC. against damages, claims, and
expenses arising out of subsequent sales of or use of DIGITAL DELAY INC. products, or
products containing components manufactured by DIGITAL DELAY INC. and based
upon personal injuries, deaths, property damage, lost profits, and other matters which
BUYER, its employees, or sub-contractors are or may be to any extent liable, including
without limitation, penalties imposed by the Consumer Product Safety Act (P.L. 92-573)
and liability imposed upon any person pursuant to the Magnuson-Moss Warranty Act (P.L.
93-637), as now in effect or as amended hereafter.
No warranties expressed or implied, are created with respect to the company’s
products except those expressly contained herein. The customer acknowledges the
disclaimers and limitations contained and relies on no other warranties or affirmations.

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2036 Fillmore Street
Davenport, Ia. 52804
563-324-1046
www.racedigitaldelay.com
PART # 1023 SCR
Time or RPM Switch
with Replay Tach
Instructions
The Time or RPM Switch is designed to work with all 4, 6, or 8 cylinder ignitions. This unique
Time or RPM Switch has all the features of other RPM switches. Plus, extra features including, a digital
tach, two range settings, and the ability to use time to activate devices including shift lights and automatic
shifters. The Time or RPM Switch will shift up to 5 different RPM or time shifts.
The Time or RPM Switch also includes a built-in Replay tach. The Replay tach can be viewed
directly or downloaded for printing by a DIGITAL VIEWER any time the engine is off.
Contents:
Features and Specifications...........................................................….Page 3
Quick Reference Diagram...................................................................Page 4
The Terminal Strip and Wiring Diagram..................................……..Page 5
The Keypad..........................................................................................Page 6
RPM Mode and Time Mode................................................................Page 7
Understanding the Replay Tach.................................................……. Page 8

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Features and Specifications
Features:
• Microprocessor controlled with large display
• Crystal controlled oscillator for extreme accuracy
• Large 5 button keypad for easy use with or without gloves
• Shift on Time or RPM up to 5 times
• Easy Time or RPM selection
• Easy RPM settings from 800 to 12700 RPMs
• Easy Time settings from 0.01 to 12.99 seconds
• Manual shift override button
• Very high current output
• Normally Closed output (power out until RPM or Time is reached)
• Normally Open output (no power out until RPM or Time is reached)
• Transbrake input to prevent shift from tire spin or converter flash
• Line lock input to prevent shift during a burn-out
• Controls shift lights and shift solenoids
• Digital tach
• Works with 4, 6, and 8 cylinder engines
• Built-in replay tach
• Down loading capabilities for printing hard copies of pass
• Mounting tabs for easy installation
•••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••
Specifications:
• Input Voltage Range: 10 to 18 Volts DC
• N.C. and N.O. Output Current: 20 Amps. continuous
• Line Lock Current Draw: 0.1 Amps. at 12 Volts DC
• Transbrake Current Draw: 0.1 Amps. at 12 Volts DC
• RPM Selection Increments: 100 RPM
• RPM Selection, High Range: 800 to 12,700 RPMs
• RPM Selection, Low Range: 800 to 9,900 RPMs
• Tach Operating Range: 800 to 12700 RPMs (100 RPM Increments)
• Replay record length: 15 Seconds
• Replay Tach Range: 800 to 12750 (50 RPM Increments)
• Timing Range: 0.01 to 9.99 seconds
• Time Selection Increments: 0.01 seconds
• Operating Temperature Range: -45 to 150 degrees F.

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Quick Reference Diagram

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The Terminal Strip
+12 Volts: Connect the +12 Volts terminal to a switched 12 Volt source with enough amperage capable of driving any
device connected to the Time or RPM Switch.
N.O. (Normally Open): The N.O. terminal will go from zero Volts to 12 Volts, when the Time or RPM Switch
has either timed out in time mode, or if the engine RPM is greater than the RPM setting in RPM mode.
N.C. (Normally Closed): The N.C. terminal will go from 12 Volts to zero Volts, when the Time or RPM
Switch has either timed out in time mode, or if the engine RPM is greater than the RPM setting in RPM mode.
Ground: Connect the Ground terminal to the Neg. terminal on the battery or to a good steel ground, not aluminum.
Trans. (Transbrake): Connect the Trans. terminal to the transbrake line. This terminal starts the replay tach and
the timer for shifting on time, if in time mode, when the Transbrake releases.
L.L. (Line Locks): Connect the L.L. terminal to the Line Locks control wire, if the Line Locks are used only for
the burnout. When the Line Locks are engaged for the burnout, the replay will automatically be armed. If the Line Locks are
used at the starting line or if the vehicle does not have Line Locks, a push button must be connected to the L.L. terminal to arm
the replay tach. To arm the replay tach with a push button, press the button connected to the L.L. terminal any time after the
engine is started and before the Transbrake is engaged.
Tach: Connect the Tach terminal to the Tach terminal on the ignition box. If running without an ignition box connect the
Tach terminal to the points side of the coil (minus side).

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The Keypad
The keypad is made up of a row of five keys. Each of the five keys has three functions with the exception of the High
Gear button which has four functions. The main function of each key is shown inside the box, which is around each of the
keys. With the exception of the (Tach/Settings/2nd) all of the keys can perform their main function with the engine on or off.
The main function of the (Tach/Settings/2nd) key changes depending on whether the engine is on or off. Below is a list of all
the keys and their functions.
Tach/Settings/2nd
When the engine is on, the (Tach/Settings/2nd) key only functions as a selection key to switch between the tach and
the settings. When the engine is off, the (Tach/Settings/2nd) key’s main function is to allow the 2nd function of the other four
keys to be selected. This is done by first pressing and holding down the (Tach/Settings/2nd) key. While holding down this
key press one of the other keys. This will select their second function. The last function of the (Tach/Settings/2nd) key is to
turn off the replay mode. This is explained in greater detail in Understanding The Replay Tach.
Right Arrow
The main function of the (Right Arrow) key is, to either change the hundredths place when in Time mode, or to select
RPM mode. The second function of the (Right Arrow) key is to turn the replay on. To turn the replay on, hold down the
(Tach/Settings/2nd) key and then press the (Right Arrow) key. The last function of the (Right Arrow) key is, when in replay
mode, to switch between RPM and Time. This is explained in greater detail in Understanding The Replay Tach.
Center Arrow
The main function of the (Center Arrow) key is to either change the tenths place when in Time mode, or to change the
hundreds place when in RPM mode. The second function of the (Center Arrow) key is to select either High or Low RPM and
Time range. To select the High or Low range, hold down the (Tach/Settings/2nd) key and then repeatedly press the (Center
Arrow) key until the desired setting is shown on the display. When in High range the selectable RPM range goes from 800 to
12700 and the selectable time range goes from 0.01 to 12.99 seconds. When in Low range the selectable RPM range goes from
800 to 9900 and the selectable time range goes from 0.01 to 9.99 seconds. The last function of the (Center Arrow) key is,
when in replay mode, to start and stop the scrolling of the replay. This is explained in greater detail in Understanding The
Replay Tach.
Left Arrow
The main function of the (Left Arrow) key is to either change the seconds place when in Time mode, or to change the
thousands place when in RPM mode. The second function of the (Left Arrow) key is to match the number of cylinders the
engine has to the setting of the box. To change the cylinder setting, hold down the (Tach/Settings/2nd) key and then
repeatedly press the (Left Arrow) key until the number shown on the display matches the number of cylinders of the engine.
The last function of the (Left Arrow) key is, when in replay mode, to jump to the shift points. This is explained in greater
detail in Understanding The Replay Tach.
Shift Test
The main function of the (Shift Test) key is to enable the driver to override the box and activate the shifter manually
by just pressing the (Shift Test) key. This is only allowable when the box is not running a shift cycle. The second function of
the (Shift Test) key is to select which shift you want to review or change the setting of. To use this function , first press and
hold the (Tach/Settings/2nd) key then press repeatly the Shift Test key untill the number on the display matches the shift you
desire to view or change. Changing the setting is done with the three arrow keys. The last function of the (Shift Test) key is,
when in replay mode, to change the speed of the replay. This is explained in greater detail in Understanding The Replay Tach.

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Understanding The Replay Tach
The Replay can be used as a helpful diagnostic tool. Some examples are, using the Replay to see how stable the
engine is when on a throttle stop and how different stop settings affect the engine. Also the Replay can be used to see how
different tracks and weather affect the engine’s performance. Another use of the Replay is to check the amount of time from
when the box initiates a shift and when the shift actually occurs.
The Replay information can only be viewed when the engine is turned off. Once the engine is off the Replay
information can be viewed by pressing and holding down the 2nd function key, which is the far right key, and then pressing
the Replay Mode key, which is just to the left of the 2nd function key. Once both keys have been pressed the display will
show the letters PE, meaning the Replay is enabled. Any time after the Replay has been enabled, the release of both keys will
enter the unit into Replay mode. Upon entering Replay mode the starting line time is shown on the display and the operation
of the keys change to the function that is listed directly above each key. While in Replay mode if the engine is started the unit
will automatically turn off the Replay feature and exit from Replay mode.
The replay function of each key is listed below.
Replay Off Key...... When this key is pressed, Replay mode is turned off.
RPM / Time Key......... This key is used to switch the display between time and RPM.
Start / Stop Key........ This key is used to start and stop the Replay.
Shift Point Key.......... This key is used to jump to the next shift point.
Replay Speed Key.. This key is used to change the rate at which the replay plays.
Once the starting line time is being shown on the display, to start the Replay press the Start / Stop key. The Replay
will now start replaying the last pass saved in memory. The time on the display will start counting up in high replay speed. As
the time is counting up the speed of the Replay can be changed by pressing Replay Speed key. Each time the Replay Speed
key is pressed the speed of the Replay will change. The order that the speeds change is from high to medium to slow to extra
slow and then back to high. Press the Start / Stop again to stop the counting at the desired time. Then press the RPM / Time
key to show the saved engine RPM that corresponds to the time that was shown on the display when the Start / Stop key was
pressed.
The Start / Stop key can also be pressed while the RPM information is being displayed. This will cause the unit to
Replay the RPM in the order in which it was saved. Press the Start / Stop key again to stop the Replay at the desired RPM.
Then press the RPM / Time key to show the time that corresponds to the RPM that was on the display when Start / Stop key
was pressed.
The Shift Point key can be pressed any time the Replay has been stopped. When the Shift Point key is pressed, if
there was at least one shift, the unit will jump to the shift point. The display will show either the RPM or the time the shift
occurred, depending upon whether the RPM or the time was being viewed before the Shift Point key was pressed. If a time
was shown on the display when the Shift Point key was pressed, the unit will jump to the time when the first shift occurred.
After jumping to a shift point, several things can be done. One of these is switching between the time and RPM of the shift by
pressing the RPM / Time key. Or pressing the Shift Point key again to see if any other shifts occurred, a maximum of five can
be saved each pass. Or pressing the Start / Stop key to start the Replay from the current shift point being displayed.
When done, press the Replay Off key. While the Replay Off key is held down the letters PO will be shown on the
display indicating the Replay is off. When the Replay key is released the unit will exit the Replay mode and return to the same
point the unit was at when the Replay was turned on.