A/F Tuning Q + ProM 80mm 24lb datasheet?

mackey said:

I have a quick issue when tuning. It seems anytime I step on the gas, WOT, the car goes extremely rich 8.0:1. Is this because of the MAF or because of something else. I had it tuned well last year but now I am having trouble getting it to stay around 12-13:1 at WOT. My idle is fine at around 14:1.

Also does anyone have a Prom or PMAS 80mm 24LB datasheet? I cannot find mine. Also I've been using just the Prom24 from the tweecer files, is that a good replacement?

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was it running fine and just change on its own , or did you change something ?

Sounds like something has gone wrong

You say it was tuned fine last year

Usually one gets his Closed Loop tune fairly close
then
He goes to work on the Open Loop or WOT tune

Not doing it in that order just makes for double work
cause your inj values effect the Open Loop tune you
just got done with when you get around to tuning
for Closed Loop

Briefly ... the fuel tables in our pcm's call for high 11's to 1

In a nutshell ... For WOT fuel tuning

I work with the Open Loop only part of the maf curve
I set my fuel table a bit fat all across the rpm range
I then adjust the maf curve to achieve the commanded ratio seen
on my wb from the table

That allows me to easily change my ratio with fuel table values

Since you are seeing 8.00 to 1.00

Something ... Somewhere ... has got to have gone wrong
for you to be seeing that fat of a mixture

or

Your wb is outta whack

Grady