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Thread: Very unusual '7747 .bin ~ 7.4 liter / 700R4

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  1. #6
    RIP EagleMark's Avatar
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    Feb 2011
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    Max timing allowed in a V8 distributor is 41.84 degrees allowed in most bins and this one is not changed. So 53.79 - 9.84 = 43.85 and cut back to 41.84

    Warm Spark bias is 9.84 on small block and this one is a small block starting bin with 9.84 so take that off the entire timing table. When you start with a BB bin there is 0 warm spark bias.

    AE is very differant on a stock BB to SB and this one is still stock SB. Can't see how a motor would run well with less then stock AE?

    Max timing in the Read bin Spark table is 28.12 minus the 9.84 bias is 18ish total timing? Now there is some big changes in actual timing because SB Spark Latency is differant in spots up to 6 degrees to actual to SB. Still don't know why GM did that? Wonder why I always say "So where is your actual timing?" But 18 is hardly max timing in that motor...

    That spark table sucks! Where is distributor set? Bin says 0... Idle timing up to 33 minus bias is 23, stock BB motor is 20.04, so not much idle timing change for a stock BB engine and only 2 degrees at WOT max...

    Fuel is even worse. Just add up VE1 and VE2 and you'll see he is out of fuel at 100% near 1200 RPM up at WOT.

    A real question would be if TCC is working? On 46 inch tires I would not use it unless it's not loaded and has 5.xx gears, but is it being controlled and how? That bin was for a turbo 400. I did build a ASDU bin to 7.4L 700R4 with lean cruise and ESC test done if you want it? (Forget lean cruise on that truck...) If that has a knock sensor then with an aggressive timing curve the ESC test will sure make it rattle when it goes off. It adds 11 degrees for first test and 22 for 2nd test if first fails... rattle rattle... knock retard only takes out 8.xx

    The PE AFR has been worked on in that Read bin so that may be the only reason WOT is tuned in...

    Here's an updated $42 xdf as the last one I think you got had an issue with Main VE only allowed to 40% lowest... The stock ASDU for 700R4 changed all engine paremeters to 7.4L
    Attached Files Attached Files

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

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