Speed Density larger throttle body, what EEC-IV parameters to change?

[wwhite]

Hi, have a stock 351w, bolting on larger throttle body.
Background info, have a built 351w, heads, cam, intake, headers, etc. tuned no problem with stock throttle body.

Now, I am learning to tune JUST idle air, etc. with only a larger throttle body. I think will help once I do the engine swap later.

So, with specifics, looks like Throttle Body Air Flow is ITHBMA. Different bins have different values.

Currently my bin has it set at .6599121 lbs/min.
Others I see, at stock are .6699... lbs/min.

How to calculate what is needed?
Also, what other scalars, functions and tables need to updated for proper tune, with just changing out the TB?

 

[slow94]

By using the term bin I'm assuming you have a quarterhorse? Not alot of those guys on here anymore. The Tweecer was more used. However you shouldn't really need to change much at all for a larger TB on a stockish truck.

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