Yelo

I see an upper limit of .80 Grams/Cyl at my estimated torque peak (4800rpm), I know because of the hotter temps now I'll actually see higher numbers during the winter (I just started REALLY paying attention to this lately...mostly due to the SD tune I'm now running) but what is a "normal" upper range for an H/C 6.0

dewmanshu

iTrader: (4)

sounds about right. You hear .72 with most of the 5.3's.

nonnieselman

iTrader: (10)

not to steal this thread....

but what exactly is Grams/Cyl??

I see its on the Timing Tables... set the spark advance with the RPMs and Grams/Cyl..

im not exactly sure what the Grams/Cyl is?
is it predicted??

Yelo

Grams/Cyl = number of grams of air that each individual cylinder is getting per combustion stroke....doens't sound like alot, but figure out how much 1 gram of air weighs and the volume of that amount of air will really suprise you

nonnieselman

iTrader: (10)

AHH, i wasnt exactly sure what it meant....

So with a CAI or Ram Air, at higher speeds, would it force more air into the motor??

dewmanshu

iTrader: (4)

In simplest terms, the CAI will make it "easier" for your motor to "suck" air. Less restricition and supposedly a cooler charge (hence COLD air intake)

A RAM, a real RAM will essential jam the air into the air trac as you go faster...again making it alot easier for the engine to get the air...volume of air.

Neither will probably increase the actual amount of air the motor is taking in the ultimat end. Just frees up restriction. You may see a bump into next MAP line.

Mort

Grams/Cylinder = (MAF in G/S * 15)/RPM

So you log your MAF in Grams/second and multiply by 15. The result is divided by the RPM logged for the given MAF reading. If your logging software records data in grams/Cyl then this is the formula it uses to calculate the result that you see.

Zick

iTrader: (18)

Right now I believe I am also hitting .80 g/cyl.

dc_justin

iTrader: (13)

Or, rather than using a calculated PID, you log one of the g/cyl PIDs that the PCM has enabled (depending on OS). My OS has two. One for the air flow used for all PCM calculations, the other showing air flow based on VE table (speed density).

Yelo

I'm doing it on polished but otherwise stock LS1 heads...does that sound normal ??