[Diy_efi] alpha-n

[Joe Lutz]

alpha is throttle position.  n is engine speed.  Alpha-n means the engine is 
mapped based on engine speed and throttle position instead of load <manifold 
pressure> and engine speed like the speed density system.  The map sensor is 
left open to atmosphere instead of being referenced to the manifold so that 
it only is used to measure barometric pressure.  Generally the air temp 
sensor is placed to measure ambient as well because the readings from the 
map and air temp sensor are used by the ecm to do an ideal gas calculation 
to find the density of the air so the readings need to be taken from the 
same reference.  This is usually used on motorcycles and engines with low or 
very transient manifold pressures.

Joe


From: "William Frye" <nova at justice.com>
>Reply-To: List for general do-it-yourself EFI talk <diy_efi at diy-efi.org>
>To: diy_efi at diy-efi.org
>Subject: [Diy_efi] alpha-n
>Date: Tue, 01 Jul 2003 09:13:54 -0700 (PDT)
>
>I have never heard of the alpha-n system. Could someone
>describe how they work and how the relate to speed
>density systems?
>
>_________________________________________________
>FindLaw - Free Case Law, Jobs, Library, Community
>http://www.FindLaw.com
>Get your FREE @JUSTICE.COM email!
>http://mail.Justice.com
>
>_______________________________________________
>Diy_efi mailing list
>Diy_efi at diy-efi.org
>http://www.diy-efi.org/mailman/listinfo/diy_efi

_________________________________________________________________
STOP MORE SPAM with the new MSN 8 and get 2 months FREE*  
http://join.msn.com/?page=features/junkmail


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