Mallory Ignition 49340 User Manual
Congratulations! You have purchased the ACCEL TIMING COMPUTER.
Your ACCEL TIMING COMPUTER allows you to pre-program timing curves, for engines
at use distributors, from 0 to 16,000
ressure with a MAP sensor it can adjust timing for vacuum advance and boost retard. It also
as inputs for Nitrous R
etard and two RPM-activated outputs.
RPM
in 500 RPM increments. When reading manifold
You must use your A
CCEL TIMING COMPUTER with an ACCEL+ ignition module.
Use ACCEL
RACE WIRE spark plug wires!
300+
Solid-core spark plug wires emit RFI and EMI static,
which can disrupt On-board electronics.
Do not use your TIMING COMPUTER with more than 18 volts.
Do not use your TIMING COMPUTER with another timing control module.
They both may try to override each other.
Your ACCEL TIMING COMPUTER, like any electronic component, is sensitive to heat.
Keep it away from temperatures greater than 150°F (65°C)
.
Follow the installation instructions in this Owners Manual carefully.
Incorrect installation can damage the Timing Computer, damage
your engine, and may
VOID YOUR W ARRANTY.
This unit cannot be returned to your
dealer for testing or for warranty.
It must be returned to:
MR. GASKET PRODUCT REPAIR
8700 BROOKPARK ROAD
CLEVELAND
216-398-8300 Ext-310
, OH 44129
Your warranty card must be on record at
A
CCEL to insure warranty processing.
(See your warranty card for details.)
his package provides everything you will need to install your ACCEL TIMING
COMPUTER. Wire lengths provided are enough for almost all vehicles. If you must splice
dditional wire use 16 gauge wire, or larger.
We
STRONGLY recommend you install an ACCEL
Crank Trigger with your Timing Computer.
With no crank trigger you will need a Locked
Distributor and a Rotor Phasing Kit.
To use the Vacuum Advance and Boost Retard
unctions you must install a 2-Bar MAP Sensor
A
CCEL/DFI Part# 74776). Install it either on
he intake manifold or the carburetor base.
(No need for a 3-Bar MAP Sensor)
ADDITIONAL HARDWARE
THE TIMING COMPUTER – AN OVERVIEW
our new ACCEL TIMING COMPUTER controls the signals that tell your ignition when to fire.
must be installed between your triggering device (distributor pickup, crank or magnetic
igger, etc.) and your ignition module.
our A
CCEL TIMING COMPUTER also has two
dditional inputs to further adjust timing
alues (from a MAP Sensor and a Nitrous
olenoid). It outputs timing values to your
CCEL+ ignition. It can also output, through
wo internally switched connectors, to two
PM-activated devices (either a Shift Light,
2O solenoid, or even an Air Shifter).
While the A
CCEL TIMING COMPUTER is not a complicated device, installation requires some
pecific knowledge. You will be better prepared for its initial and future configuration if
ou read this manual before installation and keep some important details in mind.
• Use caution when selecting values. Make small changes and then evaluate their effect.
• The rev-limit set in your A
CCEL+ ignition module is your engine’s maximum rev-limit.
Be sure it fits your engines needs and the needs of any additional control modules.
• Disconnect Nitrous, during installation and configuration.
• The A
CCEL TIMING
COMPUTER causes a small fixed timing retard in the trigger, due
to computational delay. Engine timing
MUST be adjusted during and after installation.
• The Timing Computer has three operating modes: Programming Mode, Control Mode, and
Diagnostics. Programming and Control modes overlap (ignition control is performed
while the Timing Computer is in Programming Mode).
Diagnostics Mode see Pg 17.
• It may take a few seconds for the Timing Computer to store saved values. Be sure
the LED display stabilizes, to show your current engine timing, before turning the
module off. Powering off during a save operation may corrupt the unit’s memory.
ADJUSTING AND STORING VALUES
The SAVE button tells the A
CCEL TIMING C
OMPUTER to store all newly adjusted values.
They will be remembered, until they have been re-programmed and then over-written with the
SAVE button.
You can adjust, and test, but not store values by turning
your
TIMING COMPUTER off, without pressing SAVE.
LED’s will display the current timing curve, or the
The
RPM of whatever function you are adjusting.
CONNECTING THE ACCEL TIMING COMPUTER
ACCEL IGNITION SYSTEM
TO AN
he ACCEL TIMING COMPUTER uses special signals to communicate with your ACCEL+
gnition, and
• Open the A
Unscrew the screws and swivel it out of the way to reveal the
• Using a small tool (A pencil is good) gently push up
DIP-Switch-4, inside your ACCEL+ ignition module, must be pushed UP.
CCEL+ ignition’s cover plate (the one with the wires coming through it).
DIP-S
witches.
DIP-Switch-4.
This A
set to rev-limit an
engine at 5,000
When connected to any A
module,
DIP-Switch-4 must be pushed UP.
CCEL
300+ ig
nition box has been
8-cylinder
RPM.
CCEL control
DIP-Switch-4
When not connected to a module push
DIP-Switch-4 DOWN.
When not connected to an A
CCEL
control module your ACCEL+ will
not start with
DIP-S
witch-4 UP.
• After you have set dip-switch-4,
close the cover and retighten all
three of its screws.
you move your A
CCEL TIMING COMPUTER to a different car, or make significant changes
o your engine, you probably will also want to change most, if not all, of its stored values.
may be a good idea to treat any major engine change as a brand new installation, and
eprogram your Timing Computer from the ground up.
eep a good record of what values were used, when, and why! These records will be very
aluable, saving both time and parts, if and when you make more changes.
SELECTING THE NUMBER OF CYLINDERS
1. With the unit powered off press and hold
down both the SAVE and RPM buttons.
2. While holding both buttons down, apply power to the Timing Computer.
It will display a number that represents the number of cylinders in an
engine (
the factory default is 8).
3. Use the ⇑and ⇓keys to select the number of cylinders for your engine.
4. When finished, press SAVE. This stores this new information and puts
the module back into Control Mode operation.
If you do not make this selection your
Timing Computer uses the factory default.
Make this selection only once per installation.
PROGRAMMING YOUR TRIGGER POSITION (Maximum Timing - 34°)
good choice to program for trigger position is the maximum timing you’ll ever use plus 2°.
1. With the engine stopped, and the Timing
Computer powered off, adjust the trigger
(distributor position, crank or mag trigger, etc.)
Programming
Dot
as close to 36° as possible.
2. Press and hold the SAVE and VAC ADV buttons,
and apply power. The unit will display a value for
Trigger Position.
3. Use the ⇑or ⇓key to select 36° (For the example
we are using), and press SAVE to store this new
value and also return to Control Mode.
CONFIGURING MAXIMUM TIMING WITH A CRANK TRIGGER
et your ‘Rotor Phase’to 20° BTDC (most timing curves center around this arbitrary point).
1. Rotate the engine until Cylinder-1 is at 20°
BTDC.
2. Adjust the distributor so the rotor centers on Cylinder-1’s terminal.
The A
CCEL TIMING COMPUTER has a Computational Delay of 2°.
New Timing Computers come with a default trigger
configuration of 36°, for a “Maximum Timing” of 34°.
(Trigger minus 2° Computational Delay = Maximum Timing)
3. To use the factory default, adjust your crank trigger to 36°.
(36°Crank Trigger minus 2° Computational Delay = 34°Maximum Timing)
CONFIGURING MAXIMUM TIMING WITHOUT A CRANK TRIGGER
Instead of a crank trigger use a locked distributor and
a rotor phasing kit, or an A
et your ‘Rotor Phase’ to 20°
1. Rotate the engine until Cylinder-1 is at 20° BTDC.
2. Adjust the rotor (NOT the distributor body) to center on Cylinder-1’s terminal.
3. Adjust your distributor body to match the Timing Computer’s
BTDC (most timing curves center around this arbitrary point).
CCEL BILLETECH distributor.
trigger position (i.e. 36°).
CONFIGURING A HIGHER MAXIMUM TIMING (for example 50°)
1. With the power off, adjust your trigger to 52°.
(52° Trigger minus 2° Computational Delay = 50° Maximum Timing)
2. With the power still off, hold down the VAC ADV and SAVE buttons, and
power-up the unit (Do not start your engine yet).
The LED display will show the current trigger configuration.
3. Push the ⇑button until the display reads 52°
This tells the Timing Computer that the crank trigger is at 52°.
The actual Maximum Timing is 50° (52° minus Computational Delay).
4. Store this new value of 52° by pushing the SAVE button.
5. You can now power-off the unit or continue with further programming,
SETTING TIMING – ABASE CURVE
he ACCEL TIMING COMPUTER has been designed to automatically Advance or Retard your
gnition timing to meet changing conditions. You must program a Base Timing Curve
efore it can make any adjustments. The Base T iming Curve is the timing that takes effect
t specific RPM and atmospheric pressure
he Base Curve, and all future adjustments, are done in 1° per 500
1. Begin by pressing the
the
LED display reads the desired RPM value (start at 00000).
2. Press the
TIMING button and, also with the
RPM button. Use the
(no Vacuum, no Boost, no N20, open throttle).
RPM increments.
and ⇓buttons until
⇑
and ⇓buttons,
⇑
modify the value displayed to your pre-determined value.
3. Repeat Step
500
4. When you are satisfied with the values entered press the
-1 and Step-2, increasing the RPM value displayed by
rpm, and modify timing until you reach your Peak RPM.
(Do
NOT skip any of the 500 RPM increments!)
SAVE button,
storing all values currently in effect.
N ALTERNATE METHOD OF REV
A
go another 500
RPM increment and retard timing by 10°–15°.
-LIMITING
– When you reach Peak RPM.
The Timing Computer’s display at 2,000
when you toggle between T
IMING and RPM,
RPM,
or the chart, and timing curve shown above.
f the timing programmed for 1,000
Timing Computer will compute the correct timing for
RPM
is 15°, and the timing for 1,500
1,100, 1,200, 1,300, and 1,400RPM.
RPM is 20°, the
Timing will ramp up slowly from 15° to 20°. There will not be a sudden jump of 5°.
The maximum ignition advance and the trigger position are interdependent. Your A
CCEL
TIMING COMPUTER will not allow a maximum advance beyond trigger position minus 2°.
You cannot set a trigger position less than the timing curve’ s maximum advance plus2°.
Therefore - during installation some of the Timing Computer’s factory defaults may
ave to be modified to smaller values, before you can set the trigger position.
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