5.3 Ignition settings 5 SETTING UP A BASIC CONFIGURATION
The MS3Pro needs to be configured for rising edge in this instance as that matches the "sharp" well defined
zero crossing of the input signal. Triggering on the falling edge will result in a more unstable signal.
• Spark Output - This setting is critical or you will damage your coils or ignition modules. Going High means
that the output goes high (5 volts) to dwell the coil, and then drops low to discharge the coil. Going Low
means that the output is held at 5 volts, drops to 0 volts to dwell the coil, and then goes back to 5 volts to
make the coil discharge. For 99% of installs using the MS3Pro, this should be set to "Going high".
• Number of coils - Specifies the type of ignition coils in use. TheMS3Pro automatically chooses the number
of outputs to use based on this setting and the number of cylinders.
– Single coil - just one coil or spark output. e.g. single coil, TFI, HEI, EDIS. EDIS actually has multiple
coils, but there is only one output from the MS3Pro to the EDIS module, so it uses the “Single Coil”
setting.
– Wasted spark - one double ended coil for a pair of cylinders. i.e. 2 spark outputs on a 4 cylinder.
– COP - coil-on-plug - one coil per cylinder fired once per cycle (typically needs a cam sensor)
– Wasted COP - one coil per cylinder fired twice per cycle (typically does not need a cam sensor.) Coils
are wired the same as COP.
– Dual dizzy - for single plug engines with two coils and two distributors, each operating half the cylinders.
This appears on some Lexus, Porsche, Jaguar, and BMW engines.
• Spark hardware in use - Setting this to Spark uses the regular spark outputs, which supply a 5 volt signal.
You may select Tach Out to use the tach output to control a CDI ignition or Ford TFI distributor, which uses a
12 volt square wave.
• Cam input - Normally this should be the CMP input, but you can also use Digital Frequency In 2 for Hall
sensors. The MS3Pro can also use MAP sampling combined with a missing tooth wheel on single or two
cylinder motorcycle engines.
• Tertiary tach input - Only used on Audi tri-tach inputs.
• Flip polarity on hi-res tach - used on Optispark and Nissan distributors to invert the signal on the ring of
360 slots.
The remaining settings on the left hand side are for Toothed Wheel mode, which will be covered in the specific
ignition settings section. Here is what the settings on the right hand side do.
• Fixed advance - When set to "Fixed Advance", the spark timing is locked to the value set below. This is used
for confirming timing with a strobe timing light during setup. For normal operation, this must be set to "Use
table" so that the spark advance table is used.
• Use Prediction - Normally set to "1st Deriv Prediction". Alters the way the internal spark timing calculation
functions. With no prediction, spark retard may be observed during engine acceleration. With 1st Deriv, this
is automatically compensated for.
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 58
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