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

[Startled Jackrabbit]

Hi everyone!

This is my first post to this list, and I've only just
recently become very interested in EFI.  I'm
considering building a setup to replace my current ECU
(I have a '90 Talon Tsi AWD).  I will probably base it
off of an Atmel AVR.

Anyway, my car is turbocharged and is equipped with a
Karman vortex type mass airflow sensor.  From what
I've read, speed density is a better set up overall,
especially for turbos, and I would like to use it in
my design.  I am fairly knowledgable about how both
systems work.

My question is this:  
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.  What is the best way to compensate for
this?  I would prefer to be able to do this without
needing a wideband O2 sensor.
Should I just use an acceleration enrichment table
that is active above a certain boost level and
correlate it with throttle position and tune it with
my EGT gauge?  That would be tedious but doable.  Is
there a better way (calculations are nice...)?

Thanks in advance!

Over and out,
JeremyB.





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