Running lean?

[BFE TITAN]

I have read a few posts on here and one recently with someone who had exhast and CAI and was running 14:1 A/F ratio . Has anyone else ran into a lean condition with these minor mods? I was looking to get a magnaflow exhaust and volant cai but am kinda leary if this what what I will end up at. Especially since I live in the nice 115 degree weather here in Arizona.

[baseballfanz]

Best thing to do is get the A/F read. Each Titan is different. Get a dyno with A/F reading of get Cipher.

[sumpump_1203]

What the hell are we talking about? i have no clue? lean what? 14:1 what?
sorry if its a dumb question.

[Fox Delta]

Originally Posted by sumpump_1203

What the hell are we talking about? i have no clue? lean what? 14:1 what?
sorry if its a dumb question.

the air to fuel ratio - A/F - normal (stoichiometric) air to fuel ratio is 14.7:1 if I'm not mistaken -

[Fox Delta]

see what I found on wikipedia ---
I deleted the industrial stuff
From Wikipedia, the free encyclopedia

Air-fuel ratio (AFR) is the mass ratio of air to fuel present during combustion. When all the fuel is combined with all the free oxygen, typically within a vehicle's combustion chamber, the mixture is chemically balanced and this AFR is called the stoichiometric mixture (often abbreviated to stoich). AFR is an important measure for anti-pollution and performance tuning reasons. Lambda (λ) is an alternative way to represent AFR.

A stoichiometric mixture is the working point that modern engine management systems employing fuel injection attempt to achieve in light load cruise situations. For gasoline fuel, the stoichiometric air/fuel mixture is approximately 14.7 times the mass of air to fuel. Any mixture less than 14.7 to 1 is considered to be a rich mixture, any more than 14.7 to 1 is a lean mixture - given perfect (ideal) "test" fuel (gasoline consisting of solely n-heptane and iso-octane). In reality, most fuels consist of a combination of heptane, octane, a handful of other alkanes, plus additives including detergents, and possibly oxygenators such as MTBE (Methyl tertiary-butyl ether) or ethanol/methanol. These compounds all alter the stoichiometric ratio, with most of the additives pushing the ratio downward (oxygenators bring extra oxygen to the combustion event in liquid form that is released at time of combustions; for MTBE-laden fuel, a stoichiometric ratio can be as low as 14.1:1). Vehicles using an oxygen sensor(s) or other feedback-loop to control fuel to air ratios (usually by controlling fuel volume) will usually compensate automatically for this change in the fuel's stoichiometric rate by measuring the exhaust gas composition, while vehicles without such controls (such as most motorcycles, and cars predating the mid-1970's) may have difficulties running certain boutique blends of fuels (esp. winter fuels used in some areas) and may need to be rejetted (or otherwise have the fueling ratios altered) to compensate for special botique fuel mixes. Vehicles using oxygen sensors enable the air-fuel ratio to be monitored by means of an air fuel ratio meter.

[Papa_D]

I spoke with a Tech at a Nissan dealership when having my headlight replaced yesterday and this this is what he told me. 14:1 is what the truck was designed to run at and I asked him what it ran under WOT and he told me that that data was, for lack of a better term "hidden". What say the experts? What should our trucks be running under WOT and cruising? By the way, this was a Tech of 15 years and he knew a fair bit about our engines history and racing heritage and may have known a bit about how our engines are supposed to perform. So who knows for certain? what is optimal AFR for producing power? what is optimal for cruising?

[sudden urge]

I found this online the other day and posted it under different threads:

Fuel-air mixture is one of the most important principles of internal combustion engine operation. For gasoline, the stoichiometric fuel-air ratio is 14.7:1. That is, 1 unit of fuel mass is consumed for every 14.7 units of air mass that are drawn into the engine. The stoichiometric is neither most fuel efficient nor delivers the most power; it is a compromise. The Stoichiometric ratio usually is the least polluting, because the catalytic converter can most easily remove pollutants at such a ratio. This mode is used during cruising and light acceleration.

For optimum power, a 12.7:1 (slightly fuel-rich) fuel-air ratio should be used. The latent heat of vaporization of the extra fuel cools down the combustion chamber, making the air more dense. Since this dense air is heavier than normal air, more fuel can be drawn in, increasing power. This cooling effect also protects engine parts from melting (if you are running very high temperatures), and lowers the octane requirement. However, it is not very fuel efficient, it can foul spark plugs, and is polluting (the catalytic converter is outside its optimum range, and VERY polluting unburned hydrocarbons are released). Modern cars usually only use this mode (called fuel enrichment mode) under hard acceleration.

[Titantexan]

On my last dyno run my A/F was 13.38, that's not to bad.
I have the *2 degree, AEM Cai & Flowmaster 50/suv muffler swap only.