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Thread: Can't account for ignition timing.

  1. #11
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    Also, ensure the Decel Fuel Cutoff isn't enable until you're finished tuning. Enable & tune its two parameters when the Base Fuel Table is well tuned.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, 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.

  2. #12

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    Quote Originally Posted by Cougar5.0 View Post
    It's a flaw in a system that doesn't require knowledge of the vehicle's speed/gear position. No OEM setup does this. I noticed this in a datalog of mine this week and thought "well this is a stupid, but unavoidable consequence of not knowing vehicle speed or gear position."
    Thanks for that explanation. I also was grumbling about it and wondering why none of my friends ever have to deal with this crap, but now I understand why.

    Quote Originally Posted by Danny Cabral View Post
    There are ways around it, such as an Advanced 2D Table - Timing Offset type.
    Do you have an example of this? Or at least what the axis labels would be? Although, I'm guessing it doesn't work as good or else it would've been preferred method in the EFI software.
    Last edited by Qwktrip; 10-02-2019 at 10:24 PM.

  3. #13
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    Quote Originally Posted by Qwktrip View Post
    Do you have an example of this? Or at least what the axis labels would be?
    Advanced 2D Table, Enable Table, Timing Offset Table Type, RPM X Axis, MAP Y Axis, VSS or TPS Advanced Enable.
    Then add ignition timing advance (positive value) in that deceleration/return to idle area of the Advanced 2D Table.

    Although, I'm guessing it doesn't work as good or else it would've been preferred method in the EFI software.
    It works fine, because you'll custom tailor it for your particular application. Not every application needs this, nor does every application have a VSS sensor installed.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, 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.

  4. #14
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    Quote Originally Posted by Qwktrip View Post
    Looking at a datalog and I can't account for how/why timing is being retarded. This is during deceleration at 0% TPS. The Ignition Timing is 8° less than Base Timing. Any ideas what else could be pulling timing? 8° is a lot!
    Is the timing at 8° below base on deceleration causing an issue, or does it just bother you seeing it that way? If there's no issue, ignore it.

  5. #15

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    It's not so much that it's an "issue", it's trying to figure out what the heck is going on with timing & IAC while one is simply coasting in high gear.

    Click image for larger version. 

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