7.5 Accel Enrich 7 ADDITIONAL ITEMS: BEYOND BASIC FUEL AND IGNITION CONTROL
7.5.2.1 Adheres to Walls Coefficient
The X axis is the engine load. The number on the Y axis is what percent of the fuel sticks to the walls at that
load level, instead of going on into the cylinders. As a general rule, the number is higher as the load goes up, and
lower at low load since the vacuum helps vaporize the fuel. Engines with injectors pointed sharply downstream or
aimed precisely at the intake valve tend to have lower coefficients, whereas engines with worse injector targeting
can have higher numbers. An extreme example would be a carbureted manifold converted to EFI where the only
available injector location has the injectors firing perpendicular to the intake runner - you’re going to get a lot of
your fuel puddling in the manifold.
7.5.2.2 EAE Sucked-from-walls coefficient
This curve determines how much fuel is being sucked from the walls on each intake (valve open) event. It is a
percentage (Y-axis) of the total amount of fuel that has adhered to the walls based on load (X-axis), so therefore the
percentages are much smaller (about 10x smaller) than the Adhere-to-walls coefficients. It also typically increases
with load - while the vacuum can help fuel vaporize, the added mass flow can help pull the fuel off.
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 195
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