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Thread: AFR goes dead lean at 5200 RPM under full throttle.

  1. #1

    Default AFR goes dead lean at 5200 RPM under full throttle.

    I've been chasing a problem with my Holley Dominator system for a year. Holley nor a Holley "expert" have been able to help. Here's the conditions:
    Full throttle.
    Under full boost.
    Does it on the dyno as well as the track.

    The car is a small block Mopar with twin turbo running 10 psi of boost.
    Holley Dominator EFI.
    Holley Dual Sync distributor.
    Holley 120 lb/hr injectors.
    Aeromotive 3.5 GPM pump with Aeromotive regulator.
    I'm running Holley DIS ignition with standard LSx coils.

    I'm new to the forum. I used the search feature, but was unsuccessful in finding anyone with the same problem. I tried attaching a file, but it says my datalog files are invalid.

  2. #2
    Join Date
    Dec 2015
    Location
    Milwaukee WI
    Posts
    74

    Default

    How many wideband O2 sensors?
    What do the plugs look like?
    Are you hearing a misfire, or just nosing over?
    Do you have datalogs of this to look at?

  3. #3

    Default

    Last guy who was having a problem like that was sucking his inlet hose shut at full throttle.

  4. #4

    Default

    Quote Originally Posted by TRENDZ View Post
    How many wideband O2 sensors?
    What do the plugs look like?
    Are you hearing a misfire, or just nosing over?
    Do you have datalogs of this to look at?
    The plugs look good. It just noses over, goes silent. I have datalogs, but I think they're too big to post here. I have lots of those. I don't have any hoses in my intake tract just aluminum tubing. One thing that happens is that it backfires after I let off and as the cars starts to slow down I notice it's running at idle.

  5. #5

    Default

    Take shorter datalogs.

  6. #6

    Default

    Unfortunately I really can't. I use the car at the drag strip and running at full throttle on the street is scary at best. So I don't have the ability to have the laptop plugged in and toggle the datalogger. I use anything over 50% throttle to trigger the datalogger. It starts in the burnout box, so they're lengthy. Is there a way to shorten them?

  7. #7
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    27,482

    Default

    Quote Originally Posted by rm23u0a View Post
    Is there a way to shorten them?
    Yes: https://forums.holley.com/showthread...talog-Segments (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.

  8. #8

    Default

    The files are .dl files. Do I need to change that? The list of files supported by attachments doesn't have that option.

  9. #9
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    27,482

    Default

    No, you shorten the datalog (EFI software) before making them "attachments".
    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.

  10. #10

    Default

    I shortened it (in the Holley EFI software) and saved it as a .dl file on my laptop. How do I attach it here for you to see?

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