[Diy_efi] New to list, have a question about speed density

[Mike]

This is common for most AFM and MAP cars which have been
performance enhanced past the limits of the sensors for
that air flow configuration, the computer doesnt get more signal
from the sensor due to sensor calibration/range limits
- so although more actual air gets in,
the ECU doesnt inject more fuel - hence it leans out :(

Rgds

mike


At 11:51 AM 23/10/2002 -0700, you wrote:
>--- Startled Jackrabbit <bluefire211 at yahoo.com> wrote:
>
>> My car can reach full boost before I am at full
>> throttle, IE, I might reach it at 80% throttle.  The
>> ECU will think that this is the maximum airflow,
>> although I know much more will enter the engine at
>> 100% but the pressure will not increase, thus I will
>> lean out.
>
>I'm more than a little confused.  If the pressure
>remains the same, then the same amount of air will be
>entering the engine each intake cycle, throttle
>position notwithstanding.
>
>Why would it lean out if the intake manifold pressure
>is not changing?  And if the pressure is not changing,
>how can the rate of acceleration change?  The way you
>describe it, that last 20% of pedal travel makes no
>difference whatsoever in how the car runs.
>
>=====
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>|     had come up again."                    -Kurt Vonnegut     |
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