Late model 1997-2001 Corvette or Camaro Firebird Air Fuel Ratio's

[John Lamb]

I have a spreadsheet for an LT1 setup which assumes constant deltP
across the injectors and the PCM's ability to control stoich in CL to
calibrate and calculate AFR across the operational range.

The file is called Virtual_AFR_WB_Calc.xls and is located:

http://shared.slowcar.net/jlups/Virtual_AFR_WB_Calc.zip

Even though I have not done so yet, I could see how it might be feasible
to modify it for the LS1 fuel delivery which allows PW to change with
respect to MAP. Anyway this might get you started thinking in the right
direction.
JL


"romans, mark" wrote:
> 
> I have a friend who is asking for help.  Below is the text of his question.
> I don't know if there is a "Commanded AFR" listed in the data stream for the
> late
> model pcm's. (Not that it's always accurate anyway).
> Mark
> 
> Is there a way to calculate the air fuel ratio on a LS1
> using functions like MAF readings, , Injector pulse with on time ?
> 
> I need a formula in my excel template so that when I am importing PCM traces
> I can tell
> what the AFR is.
> 
> I thought since I know what the MAF is ( converting to lb/hour) and injector
> sixe ( 38 lbs)
> that I could do the math for AFR but I am missing something and not even
> code to a valid
> AFR   ???
> 
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