Bosch Motronic AFM => Point - Counterpoint

[RABBITT_Andrew at mv8.orbeng.com.au]

>>> Accelerator pumps are evil necessities required by carburators.

					--Carter<<<

Accelerator pumps are used to compensate for (amongst other things) 
manifold fuel film dynamics.  When the manifold pressure increases, 
the saturated vapour pressure of components of the fuel is exceeded 
and so they condense to the manifold walls, thus leaning the mixture 
during the transient.

Because the wetted area on an MPI is so much smaller than 
carb/manifold, this effect is not required to the same degree.

To remove this effect entirely, use Direct Injection :)

Andrew Rabbitt
Orbital Engine Company