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Thread: Air Temp Enrichment

  1. #1

    Default Air Temp Enrichment

    I've been chasing a over rich WBO2 vs Target AFR. It almost never agrees, so I was looking at my datalogs and the MAT is almost always between 75-85°F which put the ATE at 108%. I set the ATE at 100% for one block on either side of where the MAT spends almost all its time and now they actually agree. Even with the Closed Loop/Learn turned on at idle with my 102° of overlap. Is this something I'm going to regret?
    Last edited by Mad Cadder; 08-14-2019 at 04:04 PM.

  2. #2


    It's an interesting tuning question and I'm not sure I know the answer. It doesn't seem to me that you would need to be adding fuel at that temperature, but I suppose it all depends on what the normal temp is where you live. If you only drive the car when the weather is nice, then you can set your tune up to make sense for that environment. If you're going to drive the car everywhere in any weather, then you'll need to pay more attention to those enrichments.

  3. Default

    Possibly your Air Temp Enrichment has been adjusted previously because 108% at 80°F is not the default Air Temp Enrichment figures provided in the base Sniper tune. Below is a copy & paste from the base Sniper tunes.
    115.1 113.0 110.9 108.8 106.8 104.7 102.6 101.0 100.0 100.0 99.0 98.0 97.0 96.0 95.0 94.0%
    -40 -20 0 20 40 60 80 100 120 140 160 180 200 220 240 260°F
    Base calibration would be 102.6% enrichment is for 80°F. But could be different for your engine and environment combinations.
    Try having a look at the Holley Sniper 'Comparison' function. Cross check your current tune vs the base calibrations to see what is different (in Bold). Review the bold entries to see if the current tune is more appropriate then the base tunes.
    Make sure you have a backup prior and don't press the 'Copy to Base' unless you need to update the first file that was opened with the comparison content.
    1970 XW Fairmont (presented as a GT Falcon Replica), 351 Cleveland with Aussie 302 2V closed chamber heads. Edelbrock F351 2V dual plane intake manifold. Camtech CT21544 (234/238@050", 570/579lift, 2600-6200rpm quoted range, 110lobes) 1.73:1 roller rockers. AOD Transmission. Ford 9" 3.5 Diff ratio. Pacemaker #PH4050 2v Tri-Y extractors to 2.5" Hi Flow V-Tex merge pipe with dual 2.5" exhaust through Hooker Aero Chamber Mufflers. Holley Sniper EFI 4150 Super Sniper 650 with HyperSpark Ignition.

  4. #4


    I had switched it to Danny’s temp enrichment table. That one seems like it would be better. I'm unfamiliar with Holley Sniper Comparison function.
    Last edited by Mad Cadder; 08-15-2019 at 08:27 AM.

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