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    Right! The old way is actually 50% of IDC!

    Right! The old way is actually 50% of IDC!
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    I'd say good and remember one of your logs at...

    I'd say good and remember one of your logs at 61%.

    So although different format it looks like the origanal was accurate for MPFI.
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    Sorry, for got you were MPFI, change the 4 to a 2...

    Sorry, for got you were MPFI, change the 4 to a 2 in conversion.

    TBI IDC (%) = [4 * IPW (ms) * RPM]/1200
    MPFI IDC (%) = [2 * IPW (ms) * RPM]/1200
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    So far everything I've checked is only half......

    So far everything I've checked is only half... try this!
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    I moved these fuel pressure posts here Greg... ...

    I moved these fuel pressure posts here Greg...

    There's some polishing to do, thanks for the mask names on sheets. It's a lot of info, but all you have to fill in is White Boxs first set. Last st...
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    :rolleye: You know your better at math then...

    :rolleye:

    You know your better at math then me... :thumbsup:

    But you got a lot of injectors too! They fire same as TBI right? Here's MPFI
    MPFI IDC (%) = [2 * IPW (ms) * RPM]/1200

    Try out my...
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    (X*4*Y)/1200 X= BPW and Y=Engine RPM. TBI...

    (X*4*Y)/1200

    X= BPW and Y=Engine RPM.

    TBI IDC (%) = [4 * IPW (ms) * RPM]/1200

    Wrong calculation was started here in 2007:...
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    Stick with $85, there's a few issues with $D8...

    Stick with $85, there's a few issues with $D8 tables I never fixed when I found all Axxx bins were superceeded to Bxxx bins, although all I have seen they are identical except $D8 has governer...
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    What's strange about 7.4L $85/$D8 bins is BPW was...

    What's strange about 7.4L $85/$D8 bins is BPW was 134, then later 142! I beleive this was the year 7.4L changed from 80 to 76 lb/hr injectors. This is also the mask that was $85 BCC Axxx that was all...
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    Here's some convincing numbers. In another thread...

    Here's some convincing numbers. In another thread a 7.4L engine with 74 (75.55)lb/hr injectors and BPC set to 142 from factory.

    He is having BLM issues at higher RPM and reported 7.05 Msec at 3600...
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    That could be another hack! But the purpose...

    That could be another hack!

    But the purpose here was not to figure out how once tuned, it was to avoid it by calibrating a tune in the first place. I still think theres a clue in BPW (now known as...
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    :laugh: That was my first impression... then...

    :laugh:

    That was my first impression... then came... :yikes:

    But looking at it airflow multiplier at 105 baro comes up to 0, then starts at 219 BPW Inverse... still pretty close to 217 I came...
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    207 out of 224 is the best I can do? Wait? Is...

    207 out of 224 is the best I can do? Wait? Is there any multipliers or for BPC? Like some do for EGR? What is EGR BPC?
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    Well I didn't change any numbers to make it work...

    Well I didn't change any numbers to make it work up until Roberts injectors and fuel pressure to make it work. But here's how I came up with others

    Part of the calculation given to us is in hacks,...
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    TBI V8 engine 1461.5 PFI V8 engine 365.375...

    TBI V8 engine 1461.5

    PFI V8 engine 365.375 which just happens to be 1461.5/4

    PFI V6 engine 1461.5/3 = 487.166

    3.1L engine (vol=.5231/rate=1.23) =.425284 * 487.166 = 207.12 which is pretty...
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    Sure makes himself look as smart as he is! Hard...

    Sure makes himself look as smart as he is! Hard for a normal GearHead Tuner to convert...
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    Well differant but same as I compared TBI and...

    Well differant but same as I compared TBI and PFI.

    TBI
    ; Val = 1461.5 * (VOL/RATE)

    PFI
    ; Val = 365.375 * (VOL/RATE) 365.375 x 4 = 1461.5 so 4X as many injectors!

    Reading...
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    Greg and Robert. Your theories are all good, but...

    Greg and Robert. Your theories are all good, but I was looking for something different. Not a test on when they go static.

    A mathmatical equation for the BPW/BPC. Since all the Sync/Async...
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    Woo Hoo! Usually I make a fool of myself...

    Woo Hoo!

    Usually I make a fool of myself first shot! :rolleye:
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    Yes! There has to be a point where it is...

    Yes! There has to be a point where it is static... right? RPM...
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    Injector bias is in $42, $85, $61 and all the...

    Injector bias is in $42, $85, $61 and all the older ECM that have a BPW/BPC. Notice these do not have Cubic Inch or any displacement or Injector size? It is calculated by engine size in liters / 8 so...
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    I protected everything so people would not change...

    I protected everything so people would not change the cells that were not in White! There is no password, in Open Office just click Tools, Protect Document and Sheet to turn off protection. I assume...
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    Hmmm... Open Office opens all Excel stuff. It can...

    Hmmm... Open Office opens all Excel stuff. It can also save as .xls so here it is.
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    I've got about a bazillion hours into learning...

    I've got about a bazillion hours into learning spreadsheets. Almost 13 hours into edits in this one recorded in the file.

    Special Thanks to Dave W at Old School EFI for sharing his BLM...
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    Now that I can use it correctly it does...

    Now that I can use it correctly it does calcaulate to same numbers I'm getting in spreadsheet.

    Still don't know what the ;2 does in equation?

    =ROUND(SQRT(new pressure/old pressure)*injector...
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