7.2 Fuel Settings 7 ADDITIONAL ITEMS: BEYOND BASIC FUEL AND IGNITION CONTROL
• Kill spark for - Initially spark is cut for this time and then fuel as well.
• TPS below, MAP below, RPM below - normal engine operation resumes when all three conditions are met.
The table on the right is the "safety limit" difference table.
Each install is different and it is up to the installer and tuner to decide on safe limits! The example data in the
screenshot above has the system only active above 95kPa and 2000rpm. Once in this region, the safety limit
difference table is the controlling factor. For example, if at a certain point you have set your target AFR (AFR table)
to be 11.9, and you then decide that a worst case of 12.3:1 AFR is allowable, the safety limit table would have 0.4
in that position. i.e. allowed AFR = target AFR + safety limit = 11.9 + 0.4 = 12.3
If then your wideband EGO sensor reports 12.4 or leaner, the warning output will be activated immediately.
(Typically this would connect to a dash mounted warning light.) If this situation persists beyond the time limit
(shown as 0.5 seconds here) then the shutdown mode begins. If the AFR returns to a "safe" level before the time
limit elapses, no shutdown takes place. Review datalogs before setting this time. The lower it is, then the sooner
the shutdown kicks in. This could help protect your engine, but setting it too low may cause annoying false alarms.
The first step in the shutdown procedure is to cut spark for a specified time (shown as 0.5 seconds here.)
During this period fuel continues with the intention of cooling the engine internals, as the lean condition is likely
to have generated excess heat. On vehicles fitted with a catalytic converter, 0.0 should normally be specified, as
catalysts are not designed to cope with raw fuel.
After the "kill spark for" time, fuel is also cut.
Normal engine operation will resume only when your Throttle, MAP and RPM are less than the limits you set.
In operation, if you trip the shutdown, the engine will suddenly die. While this will be irritating, hopefully it is less
so than the engine rebuild you might have needed.
7.2.11 Cylinder trim tables
These tables act like miniature VE tables and are added to each individual cylinder.
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 162
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