Unfortunately, if you cool it down too much, the IAT (Intake Air Temp)
sensor will sense a cold air and will richen up the mixture possibly
creating a too rich mixture (not that likely though). This is why some of
us have relocated the IAT to a cooler spot (out side of the intake
manifold). The Nitrous (in this case) makes the mixture much more dense
(packed with oxygen) which requires some extra fuel added to the mixture.
In a normal cold air intake system, the cooler air is enough to produce a
few more HP without any effects on the mixture at all. You don't want to
start playing around with the injectors to try to fatten it up unless you're
pushing a lot of extra air into the engine (ex: Supercharger, Turbocharger,
Nitrous, or a combination of those). Just install a cold air system on your
truck and you'll be happy.
- Bernd
-----Original Message-----
From: owner-dakota-truck@buffnet.net
Subject: RE: DML: Cold Air Intake Theory
So, in theory, if a person could cool air enough in the intake stream (let's
skip nitrous for the time being) it would ultimately make air denser and
ultimately cause a leaner mixture than can be handled by today's PCM's.
True? Could this be corrected by using larger injectors, i.e., more fuel to
handle the more air?
Ron
00 SLT QC 4X2 5.9 46RE 3.92 LSD
-----Original Message-----
From: owner-dakota-truck@buffnet.net
[mailto:owner-dakota-truck@buffnet.net]On Behalf Of SEMIHEMI01@aol.com
Sent: Sunday, August 27, 2000 9:57 AM
To: dakota-truck@buffnet.net
Subject: Re: DML: Cold Air Intake Theory
Ron, This is long, but it takes a lot to explain it.
In theory the colder the air the denser, therefore more oxygen molecules
can be packed into the combustion chamber at a time. Then as with
carburetored engines the leaner the mixture. If it gets cold enough then you
are running lean. FI + computer helps compensate for this situation but not
enough. In the case of nitrous> it actually does 2 things, it super cools
the
intake air down stream of its injection point thus making a real dense air
mixture + nitrous also breaks down into O2 upon combustion to add oxygen to
the fuel mixture. That is why extra fuel has also got to be added to the
stream at the same time or the lean mixture combustion temperature will
excede the limits of the material for the pistons and literally vaporize
them.
Being an old steam engine addict I know that the higher the temp of
steam
the more pressure you acquire. So, in theory temperature of the combustion
chamber would effect the amount of expansion of the gasses. Up to the point
that the humidity in the air starts cooling the temp. of the detonation
would
be the optimum. What ever the hell that would be. I have heard around 30 to
50%.
SEMIHEMI01 (Bill C.) 2001 QC, 4.7L, 5spd. 3.55 LSD, K-N Cool-Air
<A HREF="http://hometown.aol.com/semihemi01/">"THE DAK"</A>
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