[Roadsters] OT: EFI, Temp / Atmospheric Pressure Controls

[Keith0alan at aol.com]

I don't think it matters enough. The modern FI is a closed loop system  
using the oxygen sensor to measure the exhaust gases. As long as the various  
sensors are close enough to get the system to capture and go closed loop it 
will  work fine. The problem you have is when a sensor goes bad and the O2 
circuit  does not have enough authority to compensate. Then you run 
chronically rich or  lean and the "check engine" light comes on. Checking the fuel 
temp would be  fairly easy and if you were running an open loop system you 
might want to. The  later British SU carbs did actually measure fuel temp and 
compensate.
 
keith williams
 
 
In a message dated 9/22/2009 2:52:15 P.M. Pacific Daylight Time,  
gboone70 at yahoo.com writes:

I'm not  aware that any EFI systems compensate for fuel temperature.  Most  
do
however, have an IAT sensor (intake air temperature).  They also  compensate
for atmospheric pressure with a MAP sensor (manifold absolute  pressure) or 
a
MAF sensor (mass air flow).  
Gary 


From:  "nmleeds at mindspring.com"
<nmleeds at mindspring.com>
To: Datsun  Mailing List
<datsun-roadsters at autox.team.net>
Sent: Tuesday,  September 22, 2009 3:04:30 PM
Subject: [Roadsters] OT: EFI, Temp /  Atmospheric Pressure Controls

All,

I
was just pondering  (rather than putting the head back on my Datsun) and
wondering, how do EFI  systems compensate for fuel tempurature and 
atmospheric
pressure.   Both should change the volume of the fuel relative to air mass 
and
change  the mixture.  Is there an adjustment, or does it not matter that  
much?
Nathaniel
You are subscribed as  keith0alan at aol.com

Datsun-roadsters mailing  list

http://www.team.net/archive

http://autox.team.net/mailman/listinfo/datsun-roadsters