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Thread: Is this normal activity on timing?

  1. #1

    Default Is this normal activity on timing?

    Purple line is timing. It's bouncing between 11° BTDC and 18° BTDC. It's set at this idle up to 1250 RPM at 18°. Holley Dual Sync with Terminator EFI controlling MSD 6A box. Reference Angle is 50° and the Inductive Delay is set at 100 usec. When checking static timing it's mostly inline, but seems to jump a bit. It's not a steady state. Maybe my timing light has failed. Vehicle idles fine, but I find it odd the timing is retarding 7° at idle. Red line is RPM at about 950 and green line is AFR. This vehicle has side pipes and the WBO2 sensor is about 30 inches from the exhaust tip. 460 Ford. Super Cobra Jet heads, M-6250-C460 Cam Lift .588" intake, .614" exhaust, duration 244° 254° @ .050", LSA int 106° exh 114°.
    Last edited by GriffithMetal; 08-03-2020 at 05:28 PM.

  2. #2
    Join Date
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    Idle Spark control: https://forums.holley.com/showthread...521#post214521 (Related Forum Thread)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 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, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, FPP aluminum driveshaft, FPP 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 M/T Street Comp tires.

  3. #3

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    Thanks, so now I can quit chasing my tail with this.

  4. #4

    Default

    Yes, it's a feature! LOL. But also look at the timing table and make sure that the 9 cells around the target idle area have a constant timing value. Andrew

  5. #5
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    Quote Originally Posted by andrewb70 View Post
    But also look at the timing table and make sure that the 9 cells around the target idle area have a constant timing value. Andrew
    Yep, good additional point Andrew.
    http://forums.holley.com/showthread....e-Tuning-Notes (EFI Idle Tuning Notes)

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