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

[sy2th]

Hi, Jeremy -

Hope you got enough feedback to answer your question(s).  If you're gonna 
use speed density, you won't use your MAF sensor at all, nor will your 
engine care what the TPS says - MAP is MAP.  My Syclone (7749 ECM) is 
similar to yours, speed density, been doing chips for it for a few years 
now, no 'funny business' in any of the tables needed, calibrating is 
straightforward.  Might have to cop a 7749 & the GM sensors it uses - I 
dunno even what ECM the Talon uses - check w/ thier group, the're out there 
somewhere!

Barry

At 05:53 PM 10/22/02 -0700, you wrote:
>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.
>
>
>
>
>
>__________________________________________________
>Do you Yahoo!?
>Y! Web Hosting - Let the expert host your web site
>http://webhosting.yahoo.com/
>
>_______________________________________________
>Diy_efi mailing list
>Diy_efi at diy-efi.org
>http://www.diy-efi.org/mailman/listinfo/diy_efi


_______________________________________________
Diy_efi mailing list
Diy_efi at diy-efi.org
http://www.diy-efi.org/mailman/listinfo/diy_efi