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Discussion Starter · #1 ·
I am primarily talking about what a Predator actually "does" when adjusting the slope to the minus or plus side of scale.

I have searched and read these forums for days and seen a lot of references to it, and settings used. I have googled it, yahoo'ed, and even excite'ed it and I can not find a good explaination for exactly 'what' slope is or what exactly it changes about fuel delivery.

The closest thing I can find is this article:
http://fordfuelinjection.com/index.php?p=38

and this article (scroll to middle of page)
http://www.racesystems.com/webpages/chips.htm

But both articles fail to explain the following:

Does adjusting slope plus or minus change:

A. the pressure the fuel is being discharged from the injector? -- or -- Does it change the amount of fuel delivered?

B. open or close the injector sooner or later?

C. richen or lean the cylinder?

D. change the spray pattern of injector? (make it flow in more of a stream or mist)

My biggest reason for concern is; I am finding in order to get no KR and -3 to 0 LTFT's, I have to go -5 to -9 on Slope and + 6 to +9 richened on Fuel. (these settings depending on whether I modify Factory or Pred. Perf. tune)

I am concerned by going rich one way...and "minus" on slope -- what I was actually 'doing' inside my cylinder and for fuel delivery. Am I drowning the cylinder, or starving it?

Hope someone can give me a simple, layman's answer to some of the above.

I am not one who's satisified with just knowing how to tell time....I want to know how the watch works :)
 

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Discussion Starter · #3 · (Edited)
I've seen that on Diablo's website many times in the last few weeks of this searching and tuning saga. I've even read it over & over and even out loud.

And I even e-mailed them about it this week, because I think it's wrong......

Because it says.....if you're positive on LTFT you go minus on slope (which is correct) and then you LEAN the Fuel (which is NOT correct)

That is the very opposite of every RWTD tune I've seen #'s on. James RICHEN's fuel for positive LTFT's--as positive LTFT's indicates you're already lean.

What I want to know is by richening fuel and then going "minus" on slope, what effect is that having? By going minus on slope...am I leaning myself out more, and counter-acting the richening of fuel....I want to know exactly what slope actually does to the injector and it's spray pattern or fuel delivery and pressure.
 
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