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Thread: Interesting info on B3702 Injection timing

  1. #211
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    I think I can handle that.
    1998 GMC Sierra K1500 5.7/4L80E, longtubes, 411 w/COS 5, marine cam/intake, Whipple. 91 octane at 6000'.
    1997 GMC Sierra K3500 7.4/4L80E, 411 w/COS 3, Whipple, small cam.
    2004 Corvette Z06 with longtubes.

  2. #212
    Joe (Moderator) joecar's Avatar
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    Interesting... we'll see what B3703 does.

  3. #213
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    Going to play with the calculators when some decent weather breaks. My cam has a good amount of overlap, so I guess I should see a change.

  4. #214
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    Got some data yesterday, but I goofed and logged LTFTs with and without cam sensor, didn't change the value at all. Will re-engage tomorrow and add STFTs as I ASSume you were after those as well. Fair warning, after yesterday's logs truck isn't looking so hot. Left side ran lean and stayed that way, right side didn't alternate enough so take it for what it's worth.
    1998 GMC Sierra K1500 5.7/4L80E, longtubes, 411 w/COS 5, marine cam/intake, Whipple. 91 octane at 6000'.
    1997 GMC Sierra K3500 7.4/4L80E, 411 w/COS 3, Whipple, small cam.
    2004 Corvette Z06 with longtubes.

  5. #215
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    Yeah, we will need STFTs as well. If it does change anything, the change might be small and only show up on STFTs.

    If the left side is significantly lean, you should probably investigate that before worrying about this experiment.

  6. #216
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    Wideband lives in the left bank and showed 15-16:1, truck got weird after I corrected CMPRET and did a CASE relearn. It's been getting quirky lately, there's definitely a mechanical issue waiting to be discovered. I really didn't expect the effect to be so significant, the root cause is buried deeper than just a bad O2.
    1998 GMC Sierra K1500 5.7/4L80E, longtubes, 411 w/COS 5, marine cam/intake, Whipple. 91 octane at 6000'.
    1997 GMC Sierra K3500 7.4/4L80E, 411 w/COS 3, Whipple, small cam.
    2004 Corvette Z06 with longtubes.

  7. #217
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    Default resolution/sampling rate

    By utilizing the 2 external inputs of my V1, or with the converted EGR and A/C inputs. Could monitor camshaft, crankshaft sensors as well #1 spark and #1 injector. Does the scanner support enough resolution to get something useful? What is the sampling rate? Kind of like picoscope output.
    Last edited by voda1; April 3rd, 2019 at 07:41 AM.
    97 Vette 6spd, CamMotion Titan2 LS1 cam, TSP 5.3 StageII heads, Vararam intake, Z06 manifold, ARH headers/cats, Z06 catback, Monster Stage2 clutch, 04 Z06 pcv, new style knock sensor(late98 to 04).

    Using FlashScan V1 with NGK-AFX Wide band

  8. #218
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    Default Boundry value FYI

    When opening a stock 97C5 tune file in hptuners the boundry value is shown and quite different from later values.
    7.22 boundry and 4.78 normal(B3702)

    Click image for larger version. 

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    97 Vette 6spd, CamMotion Titan2 LS1 cam, TSP 5.3 StageII heads, Vararam intake, Z06 manifold, ARH headers/cats, Z06 catback, Monster Stage2 clutch, 04 Z06 pcv, new style knock sensor(late98 to 04).

    Using FlashScan V1 with NGK-AFX Wide band

  9. #219
    Joe (Moderator) joecar's Avatar
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    Scantool logs pids at 10Hz for LS1A/LS1B/P01 and 40 Hz for E38/E67.

  10. #220
    Joe (Moderator) joecar's Avatar
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    1997/8 LS1's do have various differences compared to later LS1's.

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