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  • Lean Cold Acceleration Enrichment

    When cold, I notice a high 10-40% CL Comp correction under part throttle moderate acceleration. Tune and datalog attached. Would adding fuel to "AE TPS vs Coolant Temperature" & "MAP AE vs Coolant Temp" be the right place? Looking at datalog and the "Accel Tuning", looks like my RoC isn't even kicking in. So do I lower these values to make them more sensitive/kick in quicker? Thanks, Matt
    Attached Files
    70' Chevelle, 5.3 turbo, t56 magnum, VS racing 7875, Elgin E-1840-P (sloppy stage 2) cam, flex sensor

  • #2
    Hi Matt. This must mean the Chevelle is up & running.

    Looking at your tune, I would say you are putting the cart before the horse. Your VE% Table is not as well sorted as it could be. Part of the problem is that the VE% Table is lean in certain areas, and when you get into those areas, no amount of AE Correction is going to fix your issue.

    I would also lean out the Target AFR table in the idle area, then use the Coolant Temperature A/F Ratio Offset to run it richer when cold, with matching Cold Temperature Compensation numbers to keep CL Comp as close to zero as possible during warmup. Andrew
    Instagram: @projectgattago
    Offering remote Holley EFI tuning.
    I deliver what EFI promises.
    Please get in touch if I can be of service.

    Comment


    • #3
      Andrew, yes I have been driving it quite a bit.
      When warmed up, there's not a whole lot of correction and Learn is within a couple percent (around 6% is all I'm running).
      I went up & down in idle AFR and car seems to like 13.8 best.
      The Learn Table was clear before this drive/datalog. It was a short drive and temperatures are 20F cooler today.
      I just noticed that there's a lot of CL Comp correction on cold driving and don't know where to look to fatten it up.
      I should also mention that this was a decent gas tune and now running E85. Matt
      70' Chevelle, 5.3 turbo, t56 magnum, VS racing 7875, Elgin E-1840-P (sloppy stage 2) cam, flex sensor

      Comment


      • #4
        Originally posted by bochnak View Post
        Andrew, I should also mention that this was a decent gas tune and now running E85. Matt
        That's the problem. You can't just switch fuel and not make any changes. E85 requires about 30% more fuel everywhere. I highly recommend leaving the VE% Table alone, since you feel it is well tuned, and adding a Flex Fuel sensor with the necessary Advanced ICF Tables. Andrew
        Instagram: @projectgattago
        Offering remote Holley EFI tuning.
        I deliver what EFI promises.
        Please get in touch if I can be of service.

        Comment


        • #5
          http://forums.holley.com/showthread....9676#post29676 (E85 Tuning Information)
          May God's grace bless you in the Lord Jesus Christ.
          '92 Ford Mustang GT: 385"/6.3L SBF, Dart SHP 8.2 block, forged steel crank & rods, forged pistons, Trick Flow T/W 11R 205 CNC comp ported heads, 12:1 comp ratio, 232-244 duration/.623" lift/114 LSA camshaft, TFS R-Series FTI comp ported intake, BBK 80mm T/B, Holley Dominator MPFI & DIS, Holley 36-1 crank trigger, MSD 1x cam sync, PA PMGR starter, PA 200A 3G alternator, Optima Red battery, 100HP progressive dry direct-port NOS, R134a A/C, Spal dual 12" fans, Frostbite 3-core aluminum radiator, Pypes dual 2.5" exhaust, off-road X-pipe, shorty headers, Earl's -6AN fuel system plumbing, Walbro 255 LPH in-tank pump & Pro-M -6AN hanger, S&W subframe connectors, BMR upper & lower torque box reinforcements, LenTech Strip Terminator wide-ratio AOD, 3000 RPM C6 converter, B&M Hammer shifter, Stifflers transmission crossmember & driveshaft safety loop, 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.

          Comment


          • #6
            Originally posted by andrewb70 View Post
            That's the problem. You can't just switch fuel and not make any changes. E85 requires about 30% more fuel everywhere. I highly recommend leaving the VE% Table alone, since you feel it is well tuned, and adding a Flex Fuel sensor with the necessary Advanced ICF Tables. Andrew
            VE% Table was tuned with gas. Installed a Flex Fuel sensor and Advanced Tables, etc.
            The car runs great warmed up with very little correction. It's the cold driving that I noticed that under partial load it needs more fuel. So how/where do I add that?

            Originally posted by Danny Cabral View Post
            Thanks. I have a Flex Fuel sensor and tables to add fuel, etc.
            It's my understanding that the Fuel Flow Multiplier table will add fuel everywhere, like Cranking, Acceleration Enrichment, etc.
            70' Chevelle, 5.3 turbo, t56 magnum, VS racing 7875, Elgin E-1840-P (sloppy stage 2) cam, flex sensor

            Comment


            • #7
              Originally posted by bochnak View Post
              It's the cold driving that I noticed that under partial load it needs more fuel. So how/where do I add that?
              Coolant Temperature Enrichment %. Andrew
              Instagram: @projectgattago
              Offering remote Holley EFI tuning.
              I deliver what EFI promises.
              Please get in touch if I can be of service.

              Comment


              • #8
                https://forums.holley.com/showthread...894#post219894 (Good Startup Tuning Advice Post)​
                May God's grace bless you in the Lord Jesus Christ.
                '92 Ford Mustang GT: 385"/6.3L SBF, Dart SHP 8.2 block, forged steel crank & rods, forged pistons, Trick Flow T/W 11R 205 CNC comp ported heads, 12:1 comp ratio, 232-244 duration/.623" lift/114 LSA camshaft, TFS R-Series FTI comp ported intake, BBK 80mm T/B, Holley Dominator MPFI & DIS, Holley 36-1 crank trigger, MSD 1x cam sync, PA PMGR starter, PA 200A 3G alternator, Optima Red battery, 100HP progressive dry direct-port NOS, R134a A/C, Spal dual 12" fans, Frostbite 3-core aluminum radiator, Pypes dual 2.5" exhaust, off-road X-pipe, shorty headers, Earl's -6AN fuel system plumbing, Walbro 255 LPH in-tank pump & Pro-M -6AN hanger, S&W subframe connectors, BMR upper & lower torque box reinforcements, LenTech Strip Terminator wide-ratio AOD, 3000 RPM C6 converter, B&M Hammer shifter, Stifflers transmission crossmember & driveshaft safety loop, 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.

                Comment


                • #9
                  HOWDY ALL. After a lot of reading and YOUTUBEing, I want to try switching to VE% Table fuel control. I need a starting point for the VE% Table. There's nothing in the manual I have, which is for a couple of versions back. One of the videos I watched mentioned a bunch of calculations, but said "let the computer do that." I copied the current tune to another file and tried to convert to VE% Table, but the resulting VE% Table numbers made absolutely no sense. If there are some sample ICFs for engine setups somewhere near mine, I'd like to try that first. If those exist, I'll gladly advise on my engine setup. Thanks, Pat.

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