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Thread: 95 lt1 injector offset questions

  1. #46
    Fuel Injected!
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    Mar 2013
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    502
    All the fuel injection companies use 2 types of calibration fluids. For regular production work the Rock Valley Viscor 16A and 16B are regularly used (there are other suppliers as well) for safety reasons. However, the viscosity and density are not the best match to "gasoline" and thus flow ocorrection factors must be used if absolute accuracy is required. For more accurate work, you need an explosion proof test rig and either n-Heptane or Indolene. N-Heptane can be filtered and reused because it is a pure substance. Indolene is your best match to "gasoline" but because it is a blend it can only be used for a single pass and then discarded.
    I found this formula
    One cubic centimeter per minute converted into pound per hour - Gasoline equals = 0.098 lb/hr
    1 cm3/min = 0.098 lb/hr
    or 428*0.098 = 41.944

    The correction factor of 16b fluid is not known so you may make a research.
    1.035 scalar is for N-heptan which is not applicable to you, since the injectors are tested with 16B fluid.

    is some oscillation in the PW at low load
    If the spread between the cells[on both rpm and map vectors] is not optimal and polished it can result in constant oscillations back and forth.
    The best practice is to keep constant rpm and map 2000 and 40 for example and tune with wideband.
    Very hard to achieve on the road though. If you can access a load dyno you will be done real quick.

  2. #47
    Fuel Injected! Terminal_Crazy's Avatar
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    Cheers for the help. Much appreciated.

    Thanks
    mitch
    '95 Z28 M6 -Just the odd mod.
    '80 350 A3 C3 Corvette - recent addition.

  3. #48
    Fuel Injected! spfautsch's Avatar
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    Quote Originally Posted by kur4o View Post
    If you can access a load dyno you will be done real quick.
    This is one of the statements in the Banish tuning "how-tos" I've read recently that I took slight issue with. While I completely agree with the science behind the statement, if we all had a water brake or eddy current dyno in our back pocket, well we'd also be farting cotton candy mixed with unicorn feathers. Dyno time is expensive.

    The only substitute I can imagine is finding a road with very intense hills and driving it repeatedly in as many different RPM bands as possible with the cruise control set [edit] and hope you don't encounter traffic.

  4. #49
    Fuel Injected!
    Join Date
    Jan 2015
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    Quote Originally Posted by kur4o View Post
    If the spread between the cells[on both rpm and map vectors] is not optimal and polished it can result in constant oscillations back and forth.
    The best practice is to keep constant rpm and map 2000 and 40 for example and tune with wideband.
    Very hard to achieve on the road though.
    The same can be said about tuning the VE table.

    From a controls and numerical methods perspective, once you achieve a converging amount of oscillation variance for changing your VE table, you could then apply the same method to tuning PW vs. Load table until converging amounts of oscillation variance is achieved in the data. this would in theory be the optimal setting
    Last edited by johnny_b; 2 Weeks Ago at 09:28 PM.

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