7.5 Accel Enrich 7 ADDITIONAL ITEMS: BEYOND BASIC FUEL AND IGNITION CONTROL
7.5 Accel Enrich
Section 6.3.5 covers basic acceleration enrichment tuning. Here, we’ll go over more advanced ways to fine tune
your transient fueling.
7.5.1 TPS WOT curve
If you have enabled “TPSdot enables %WOT” under Accel Enrich Settings, this curve defines what is considered
wide open throttle for a given RPM. This curve should be set so that beyond this point, additional throttle opening
has no effect on the MAP sensor reading or air flow. The acceleration enrichment will not add additional fueling
once the throttle moves past the WOT level for your RPM, as the additional throttle will not make the engine need
more fuel.
7.5.2 Enhanced acceleration enrichment
Enhanced Acceleration Enrichment (EAE) is a model base acceleration enrichment setup that uses a physics
model to determine how much fuel the engine needs under changing load. This is more complicated to tune than
regular acceleration enrichment, but can produce superior drivability. EAE is applied on top of regular acceleration
enrichment, as the regular acceleration enrichment often reacts faster, but you’ll want to reduce the amount of
regular acceleration enrichment you use when you turn EAE on.
The Enhanced Acceleration Enrichment feature is based on the concept that the fuel injected does not all enter
the engine on every injector squirt. Instead, a portion of the fuel collects on the port and/or intake runner walls.
The fuel collected there forms a puddle, from which some fuel enters the engine on every intake event.
During steady-state conditions (such as cruise or idle), the amount of fuel entering the puddle, the amount
of fuel leaving the puddle, and the amount of each injector squirt going directly into the engine reach a state of
equilibrium. However, during throttle opening or throttle closing transient conditions, the amounts of fuel entering
the puddle, leaving the puddle, and going directly into the engine change. Until equilibrium is reached again, the
amount of injected fuel must change to ensure that the intended amount of fuel (from the normal fuel equations
and VE table lookup) still enters the engine.
The EAE algorithm tracks the various quantities and adjusts the amount of fuel injected accordingly, but does
so based on several adjustment curves and settings. The following curves are what you’ll use to tune it.
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 194
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