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Scangauge Peeps - what's your fuel trim?

Discussion in 'General Automotive' started by Janster, Aug 26, 2009.

  1. Aug 26, 2009 at 3:36 PM
    #1
    Janster

    Janster [OP] Old & Forgetful

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    Just for the heck of it....

    I've got an 07 4.0L Automatic TRD Sport. Everything is stock except AFE air filter & exhaust. My fuel trim is 10.8%. The last fill-up the other day was dead on with the amount of gas I filled up with.
     
  2. Aug 26, 2009 at 5:52 PM
    #2
    Ridingontrd

    Ridingontrd Well-Known Member

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    Tag, For when i fill up next.
     
  3. Aug 29, 2009 at 4:08 AM
    #3
    Ridingontrd

    Ridingontrd Well-Known Member

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    From last fillup,9.3
    This fillup was 1 tenth off.
    Adjusted it to 9.2.
    Being one tenth off (+or-)every other tank is normal.:cool:
     
  4. Sep 3, 2009 at 10:04 AM
    #4
    Janster

    Janster [OP] Old & Forgetful

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    Bump for fuel trim! Just curious to see how they vary.
     
  5. Sep 3, 2009 at 10:53 AM
    #5
    VooDooTrip

    VooDooTrip Defector

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    S/C, URD fuel Upgrade, 2.2 Pulley, URD crank pulley, Truetrax locker, custom exhaust, plx, scangauge, D/P mod, amsoil drop in, 18x9.5 stern hyperblacks, ACA projectors, Grillcraft blackmesh, Performance Products valance, R/C Tails, B&M Short shifter, QA1 Coilovers all the way around, upgraded strut rod bars with heim joints, poly bushings everywhere lol, 1st model Streetacos bolt on four link!
    I'll check, but mine is 1st gen.
     
  6. Oct 12, 2009 at 7:52 PM
    #6
    RelentlessFab

    RelentlessFab Tacoma offroad armor fabricating beast Vendor

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    Had tons on the Taco's.... new truck is pretty stock
    I think mine is set to 9.3% also. The total at fillups vary around it a bit depending on how I drive... towing, 4x4, highway, city, mixed driving, etc. but I just leave it alone as its pretty close.
     
  7. Mar 1, 2011 at 3:47 PM
    #7
    andrew862

    andrew862 Well-Known Member

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    Just finished a tank of fuel with my TRD exhaust and AFE ProDry S Filter in stock intake with the Charcoal filter removed and I had to adjust it 10-11%. Before the exhaust the factor was always 8-9%.

    It was an all highway trip and I got 21.7 MPG! Not to shabby at 65mph mostly. I always check the scangauge against the fuelly calc and they are usually pretty close.
     
  8. Mar 2, 2011 at 11:06 AM
    #8
    wiscdave

    wiscdave Lets Do It!

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    Not to be funny - what is fuel trim?
     
  9. Mar 2, 2011 at 12:01 PM
    #9
    Janster

    Janster [OP] Old & Forgetful

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    Do you have a Scangauge II?

    Hard to explain....
    It's a number within the Scangauge that helps to keep the gas mileage calibrated for more accuracy for MPG's during each tank of gas used.
     
  10. Mar 2, 2011 at 1:43 PM
    #10
    wiscdave

    wiscdave Lets Do It!

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    yes I have the scanguage II I only adjusted the odometer 1.07 for my bigger tires 285/70/17s, then when I went back to stock during the winter months I put it back to 1.0,

    For my fillups I just let the thing do its thing after I set it after a couple tanks. I've checked it a couple times but its pretty much spot on . IF I do run 89 its better by .1-.2 a mpg per tank. its probably right on that same screen and I just missed it.

    I want to lean out the engine via a trick plate or something by the MAF..anybody try that. Cold air kills my mpg and I'm going to play with a hot intake. What is the code for that? I've had -8 intake temps and the corrilation is the lower the intake temp the more rich the pig of a motor runs = worse MPG.
     
  11. Mar 3, 2011 at 6:04 AM
    #11
    wiscdave

    wiscdave Lets Do It!

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  12. Mar 3, 2011 at 6:15 AM
    #12
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    FlimFlubberJAM
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    Fuel Trim is the ECU fine tuning the fuel delivery to the engine. You have Long Term, and SHort Term fuel trims. Long Term is the Open injector pules time over the entire RPM range of the engine. Short Term is the control over the Open injector pules in the mid to upper RPM.s Short term makes fast, temporary changes to the fuel delevery, while Long Term makes slower, more permanant changes. On a Scanguage, or Ultra Gauge, the Short and long term trims are measured in a percentage of difference from the base MAP. For example: If the Short Term reads .78, that means the fuel delevery was changed .78% from the base map in the ECU. Long term is going to be a higher number, like 8.70 or the like. The Short Term trims can also read in the negative range, like -.78, or the like.
     
  13. Mar 24, 2011 at 8:33 PM
    #13
    JLink

    JLink Well-Known Member

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    I have a SG2 and it usually is right on.. maybe with in 1/2 an mpg, but i went on a trip and forgot to reset it everytime I got gas, I have now gotten gas twice and gone to "fill up" set the correct amount of gas that was put in my tank, saved it, and it still wrong. last time I got gas it thought I'd used 24 gallons instead of like 16, I'm hoping when I fuel up next it will be alot more accurate. i just installed a snorkel so I'm trying to document it's affect on my fuel mileage.

    It's probably nothing and will be corrected simply by filling up a few more times, but since I'm kind of new to the scan gauge, does anyone have any advice?
     
  14. Mar 25, 2011 at 4:17 AM
    #14
    Janster

    Janster [OP] Old & Forgetful

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    For the most part, it calculates the MPG based on numbers. Numbers it gets from the computer (mileage & fuel trim, etc). It's not a real-time totally accurate system.

    The fuel trim & MPG readings are most accurate for the type of driving you do or set it to. If you've set it for your daily commute (assuming its about the same each day), it'll be most accurate. As soon as you throw in a long distance trip in there or you're stuck in traffic, extra stop-n-gos etc. ......to 'upset' the norm, the scangauge won't be as accurate. And that's because the fuel trim isn't set for that (for the most part).

    You can set your fuel trim everytime if you like, but understand that you are setting it for that style of driving that you did for that tank.

    If you're trying to find out the precise/more accurage MPG with the snorkel, I would manually track the MPG's using the gallons used & mileage (not the scangauge).
     
  15. Mar 25, 2011 at 9:39 AM
    #15
    Simms65

    Simms65 Well-Known Member

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    Mine varies between 4.8%-6.5%
     
  16. Mar 27, 2013 at 7:20 PM
    #16
    Super Werty

    Super Werty Sleeper 4x4

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    air and fuel
    does anyone have the exact code I need to program xgauge to see short and long term fuel trims?

    Thanks:D


    EDIT> NVM I found them
     
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