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Thread: Initial Start & Heavy Surging

  1. #11
    Join Date
    Dec 2009
    Location
    Connecticut
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    23,124

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    Quote Originally Posted by Finespline View Post
    I'm going to conduct some more ignition & timing checks before moving further with the EFI.
    I'm not sure why cylinder #4 & #6 header pipes are above 700°F, while #2 & #8 are 585-600°F.
    Maybe I'm not getting proper spark to those cylinders, or valve lash is too tight.
    Also, ensure the ignition system isn't misfiring. Check each cylinder for consistent spark flashing with your timing light.
    http://forums.holley.com/showthread....ist-Holley-EFI (Additional Troubleshooting Information)
    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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    Danny, I've read your (and others) EFI notes and other posts. Selecting the proper AFR is crucial.

    What might be the recommended idle AFR for my SBC 406, Edelbrock Performer RPM heads, 11:1 compression (I know, too high) and a 214°/224° @ 0.050" dual pattern cam? I'm currently using 14.0 idle, 14.2 cruise, 13 WOT & idle timing 18° BTDC. (The engine has never been above about 2400 RPM yet.) It appears the engine would like to idle somewhere in the 40 to 50 kPa load range.

    I'm going to switch from the TBISB215 (stock below 214° duration) base calibration, to the TBISB225 (mild street) base calibration. My original thinking was the cam was relatively small for a 406, so the stock base calibration would be better. It's not working out very well.

  3. #13
    Join Date
    Dec 2009
    Location
    Connecticut
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    23,124

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    Quote Originally Posted by Finespline View Post
    What might be the recommended idle AFR for my SBC 406, Edelbrock Performer RPM heads, 11:1 compression (I know, too high) and a 214°/224° @ 0.050" dual pattern cam? I'm currently using 14.0 idle...
    Use whichever air/fuel ratio produces the best idle quality. You just have to try different air/fuel ratios, and see which one works best. It's easy to do with the handheld controller. It will most likely be around 13.8-14.0 AFR.
    http://documents.holley.com/199r10653rev9.pdf (Terminator EFI Manual - See Figure 50, Page 27 - Early Handheld Controller)
    http://documents.holley.com/199r10903rev4.pdf (Terminator EFI Manual - See Figure 22/23, Page 21 - Late Handheld Controller)
    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.

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