I'm glad you're in agreement. Bernd's A/F mixture is running 16:1. That's
pretty lean. So I wonder if a 2-bar or 3-bar MAP sensor is the answer? Or
maybe increase fuel pressure to 50 psi? Bigger injectors [Tim Allen grunt].
I'm thinking, what if you've already maximized the output of the injectors
you have?
Ron
00 SLT QC 4X2 5.9 46RE 3.92 LSD
For modifications see my DML Profile
-----Original Message-----
From: owner-dakota-truck@buffnet.net
[mailto:owner-dakota-truck@buffnet.net]On Behalf Of Bob Tom
Sent: Saturday, November 18, 2000 4:24 PM
To: dakota-truck@buffnet.net
Subject: Re: DML: MAP Voltage questions
At 11:10 PM 11/17/00 -0600, you wrote:
>"Ignition ON (Engine OFF) - Output voltage should be 4 - 5 volts.
>Voltage should drop to 1.5 - 2.1 volts with a hot, neutral, idle."
>So, does this mean that more voltage = more fuel??? - Bernd
I would think so but it's hard to say how much because the MAP and TPS
signals both play major roles (along with O2 sensor in closed loop) in
determining PW signal (fuel amt injected).
The higher the MAP voltage output from the sensor means that the lower
the amt of vacuum pressure. As the throttle plate(s) open (lower
vacuum pressure), the TPS and the MAP signals both increase resulting
in more fuel (higher PW signals) being injected.
The question is how big a role does the MAP signal have in this
PW formula (?).
A couple of other factors to consider. The MAP signal is also used
to figure out the barometric pressure. Above peak torque rpm, volumeric
efficiency begins to fall and less fuel is needed.
Beginning to sound like the 'pregnant chad' problem in citrus land :-)
Bob
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