so what kind of readings should i be looking for? it was kinda bouncing around on the numbers. it was around 14.8 at idle. when you mash the pedal, it goes down to about 12.2. i think that was about the lowest number.that was just running in the driveway. it did get up to temp though. just dont know extactly what i should be looking for. gonna get the sct soon to help out with the tune.

this is the one i got.put it in the srt single pod pillar with handle.

http://www.aemelectronics.com/wideba...fuel-gauge-25/

 

those are good numbers. 14.7 is ideal for normal driving i believe. and 12.9 or something like that is ideal for WOT.

 

14.7 is just atmospheric pressure at sea level... so it makes sense to have 12.9 coming into your intake because of the vaccum your engine creates...

 

^^^ umm...what? thats not at all what AFR is. AFR is the weight of air vs weight of fuel. normal driving means 14.7 lbs of air per 1 lb of fuel. at WOT the engine is giving more fuel, so its only 12.9 lbs of air per 1 lb of fuel. It has nothing to do with atmospheric pressure. thats a whole different thing

 

14.7 is the perfect stoich value at idle, your truck should always be about that. At WOT, I believe right around 12.0 is where you want to see it.

 

http://en.wikipedia.org/wiki/Air-fuel_ratio

 

yes it is the stoichiometric mix....where do you think the 14.7 pounds of air comes from.. 14.7 is atomospheric pressure. what do you think pushes air into the engine? the only way to drastically change this number is by adding a turbo or supercharger. or changes in altitude..
btw i am a mechanic... i kind of know what im talking about here lol sry

 

Never heard of it described as pounds of air... Always heard it as parts air to fuel i.e. 14.7 parts air to 1 part fuel. When you start talking about pounds it really makes it sound like, at least to me, you are talking about forced induction. Changes in altitude / elevation shouldn't change the AFR either, someone running at sea level and someone running 5,000ft above sea level should have the same AFR as you are not forcing more air in, track times will change though but the AFR shouldn't. From what I understand (and please correct me if I am wrong), the computer will auto adjust the afr and either add or remove fuel (or timing) to give you the 14.7 based on the readings from the MAF sensor...

 

You're good on the comeback answer, but the first answer was a little incomplete.

 

I gotcha now bigwheel. We're on the same page Just said a little different. I used lbs because its a constant unit. Could have said any unit of measurement.