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Thread: Vehicle speed?

  1. #1
    Join Date
    Apr 2018
    Location
    Central PA
    Posts
    6

    Default Vehicle speed?

    Dealing with a RPM drop to almost a stall when coming to a stop. I didn't install this system, but have gone over the procedure in instructions several times and redid basic settings idle, IAC, TPS, etc. seems to be "Correct". I've changed the IAC Decay and Hold it will change how it acts, but still almost a stall. I know there is no ECU connection to VSS. The LS & Coyote swaps have dealt with the ECUs needed to see road speed. Does THE Terminator? Or am I still just having tune issue?

  2. #2
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    22,097

    Default

    It's a tuning issue. In the Holley EFI software (LINK), look at where the live cursor is when this happens on the Base Fuel & Timing Tables. Determine if it's stalling due to a rich or lean condition, or if the ignition timing isn't optimum in that area. You may have to record a short datalog of this occurrence, Overlay it onto your Config File, and manually tune the problem area.

    Quick Datalogger Information:
    Always provide data, not just symptoms. Is the AFR & ignition timing optimized? Overlay the datalog onto your Global File.
    Ensure the Target A/F Ratio table is properly programmed for your engine. Ensure the ECU is "Learning" (Learn Table LINK).
    Scroll through the datalog to the problem area. Then look exactly where this happens on the Base Fuel & Timing Tables. Scrutinize:
    RPM, MAP, MAT, TPS, CTS, IAC, Target AFR, AFR Left, CL Comp, Ignition Timing, Duty Cycle, Fuel Flow, Fuel Pressure & Battery.

    Using the Holley EFI software (LINK), look at where the live cursor moves to during this occurrence, and
    manually tune that area of the Base Fuel Table (enrich or lean) & Base Timing Table (optimize ignition timing).

    I find the most helpful datalog function, is overlaying the datalog on your Global File.
    I'm in the habit of using the datalog Overlay feature every time I review a datalog.
    Click on "Datalog" (on the top Toolbar), "Activate Overlay", then "Open Data Log".
    You can literally "playback" a recorded event, and watch it as it happened on any screen.
    Minimize (shrink) the datalog window, and move it to the bottom of any Global File screen.
    Then click & scroll anywhere on the datalog, and watch it playback on your Global File (EFI software).
    http://documents.holley.com/techlibr...9r10543rev.pdf (Holley EFI Datalogger Instructions)
    https://forums.holley.com/showthread...s-amp-Datalogs (Datalog & System Log Information - Read "NOTES")
    https://www.youtube.com/watch?v=iqHO...C6FEA0BB99AF17 (How To Record & Email A Datalog)
    https://forums.holley.com/showthread...7531#post77531 (Closed Loop Datalog Tuning - Posts #2, #4 & #6)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: Dominator MPFI & DIS, A/C, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/X-pipe/shorty headers, 100HP progressive dry direct-port NOS, 160A 3G alternator, Optima Red battery, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

  3. #3
    Join Date
    Apr 2018
    Location
    Central PA
    Posts
    6

    Default

    That's kind of what I figured, but I'd rather ask than chase my tail. I know you want data, but couldn't figure how to get to it. I need laptop & software to do this?

  4. #4
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    22,097

    Default

    I stated you might have to record a datalog. Datalogging is in the instructions and in post #2 above.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: Dominator MPFI & DIS, A/C, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/X-pipe/shorty headers, 100HP progressive dry direct-port NOS, 160A 3G alternator, Optima Red battery, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

  5. #5
    Join Date
    Apr 2018
    Location
    Central PA
    Posts
    6

    Default

    I think I have the datalogging figured out. Without the datalogging, I have no idea where to start. I have no idea if it's fuel or ignition or whatever. I did go through the links you post. I was lurking here for a week or so before I joined, tried to get it squared away. It is a Blueprint 347 Edelbrock RPM with 1/2 open spacer (I added after reading several posts about the divider) and a Tremec. It was same condition before and after spacer. Thanks for your input, I'll plug away today see if I can get anywhere.

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