7.8 Advanced Engine 7 ADDITIONAL ITEMS: BEYOND BASIC FUEL AND IGNITION CONTROL
– None - Launch control itself is not activated. However, this will allow you to use timed features that
activate after a launch, such as timed boost control or perfect run traction control.
– Spark cut - drop sparks; this is the most common limiter used. (Will not work with EDIS ignition or some
other semi-autonomous ignition controls.)
– Fuel cut - cuts fuel. Seen by many as risky due to the possibility of partly fueling, but if your ignition
goes into a limp home mode if you try to cut it off, this may be your only option.
– Spark and fuel - both
• Disable launch when VSS above - If you have set up a speed input, this allows you to lock out the launch
control when the vehicle is in motion.
• Limiter settings - Basic automatically sets the spark limit behavior. Advanced allows you to fine tune this
setting.
• Spark limiter type - In advanced mode, you can fine tune the spark cut behavior.
– Random progressive: Applies a random spark cut that cuts more sparks in between the soft zone and
hard limit.
– Random ramped: Random cut that ramps up across the spark cut zone.
– Fixed 5/7: Repeats a pattern of 5 sparks cut and 2 sparks fired.
– Fixed 4/5: Repeats a pattern of 4 sparks cut and 1 spark fired. Do not use on 5 cylinder engines!
• Spark cut zone - The range of RPM below the hard limit to apply a spark cut.
• Cut zone timing - The absolute timing to run when in the spark cut zone.
Flat shift settings:
• Disable Flat-Shift when VSS Below - Prevents flat-shift from activating at low speeds, such as just after
launch.
• Flat shift arming rpm - this rpm set point is used to differentiate between a flat shift and launch condition.
Typically as you are preparing to start a launch you will be at lower rpms, while for flat shift you operate the
clutch near your rev limit. So set the flat shift arming rpm to say 3/4 or your max rpms. i.e. consider what
rpms are you doing when you press the clutch and make sure the code will always know if you want the
launch limits or flat shift limits.
• Flat shift hard limit - The maximum RPM to use when flat shift is active. Uses the same soft limit zone as
launch control.
• Soft Limit Retard To - This is the timing (in absolute degrees BTDC) that the MS3Pro will command while
in the soft limit zone during a flat shift.
• Cut fuel above - this is intended to be used during flat shifting. During the up-shift as the revs are falling, the
fuel is cut off until the revs have fallen below this set point. This reduces the raw fuel in the exhaust system
that can otherwise produce a loud backfire.
• Timed retard after launch - Allows you to set a spark retard that is active immediately after launch. The
MS3Pro will then use a time based curve to put the timing back in. Use this to reduce power if you have
wheelspin, but are running in a racing series that doesn’t allow traction control.
7.8.11.2 Variable launch settings The variable launch mode allows you to adjust your launch control RPM
limit with a 0-5 volt input, allowing you to adjust your launch control for changing track conditions.
• Variable launch input
– Off - disables the feature and uses the single limits
– One of the analogue inputs - indicates what input pin is being used for the variable launch
• minimum setting - With a 0V input, the launch hard limit is set to this rpm.
• maximum setting - With a 5V input, the launch hard limit is set to this rpm
• soft limit lower by - The soft launch limit is this many rpm below the variable hard limit. 1000rpm is typical.
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 242
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