Re: CIS Temp

[QSHIPQ@aol.com]

In a message dated 97-05-14 04:20:09 EDT, you write:

<< Temperatures other than the calibration temperature would cause similar
 effects (32 F vs. 60 F would make the meter off by 2.8%). Pulsed
 injection systems typically correct for air temp; I haven't seen this
 correction on CIS, and don't know why not!  (Well, except that it's not
 there...)  Altitude is typically compensated for in CIS.
  >>
CIS turbos compensate for air temp Dave, just after the turbo and IC, since
it could care less what temp is at the meter, just what is going INTO the
t-body, and Charge Air systems are much more sensitive to ambient temp
changes.  I think the reason you don't find all N/A CIS with air temp
correction is that I doubt the "flap" metering is, or was designed to be as
accurate as EFI.  Small changes in air temp can be compensated by the lambda
circuit, lower temp = more O2 in exh = lambda increases fuel return to tank >
reducing lower chamber pressure = richens mixture.  Don't give CIS too much
credit, it has been referred to by many as a "german carb"...  An effective
toy, more so than the rochester, but hardly an EFI Mass Air opponent.

Nice Post on Mass Air, btw.

Scott