Barometric pressure

[Bob Wooten]

Yup, I see the same thing.  the faster you go the "harder" the air pushes
into the intake.  My ram air setup does the same thing.  another interesting
item (although a bit off topic) is to watch air temp go down @ the same
time.

BW

-----Original Message-----
From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
Behalf Of Bob Tom
Sent: Friday, September 14, 2001 8:34 PM
To: diy_efi at diy-efi.org
Subject: Re: Barometric pressure


At 10:09 AM 9/14/00 -0400, you wrote:
>There are several strategies.  Some take a glance at startup,
>then others at 3/4 throttle, do a review of it  The earlier ones use
>a full time baro sensor.  (the above, reference GM)   Bruce

I recorded a run at the Mopar Nats in Columbus, OH on my OTC scanner.
Prior to launch, the baro sensor readout displayed 29.1" Hg.  When the
Dak hit 25 mph, the baro reading was 29.6" and, at 39 mph, it showed
30.3".  For the remainder of the 1/4-mile run, the baro. readings bounced
back and forth between 30.3 and 30.5  I have recorded similar patterns at my
local track.

I know that the Dak's pcm stores the baro. reading at key on but have not,
to date, been able to find much details on how it is used in the engine's
management strategy.

I run with a cold/ram air box with two 4" air ducts and think that this may
be a factor for the pattern that I'm seeing.

Bob Tom     Burlington, Ont., Canada
'97 Dakota Sport, 4x2, CC, Flame red, 5.2L, auto., 3.92SG

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