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Thread: Actual vs comanded

  1. 01-14-2018 #1
    dwright122
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    Actual vs comanded

    tuning a gen 5 Camaro with an lsa blower, tons of mods. I feel the tune is really close but for some reason it still seems to be running a bit rich, I am trying to get it the command and actual to about .80. at wot. below is the log WOT pull is around the 17:11 mark. I would appreciate any info

    4th gear pull.hpl
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  2. 01-14-2018 #2
    5FDP
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    Have you tried pulling like 1-2% from the MAF curve around that area to lean it out a tiny bit?

    You still need to change the commanded EQ to .80 if you want to aim for that, you're still asking for .76ish and the actual is .73 to .74 from the looks of it.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.
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  3. 01-14-2018 #3
    dwright122
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    I have set the PE. Inrichment table to 1.245 which should equate to .80.or 11.8 afr. I just got the MAF curve to within 3% also had to adjust the tinseint settings as well as it was spiking like crazy
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  4. 01-14-2018 #4
    jsllc
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    It appears you are using a double stoich scale with an ethanol sensor. Your log shows 21.75 commanded AFR or 21.75/2 = 10.875. At the same point is shows 0.7686 commanded eq and 9.41% ethanol. There is a 0.056722 drop in stoich 14.68 for each 1 percent of alcohol so your stoich 14.146. at 0.7886 that is 10.872. So if your are looking for 11.8 on 9.42% alcohol GM eq ratio would be 14.146/11.8 if you want a 11.8 for normal gas 14.68/11.8. Just keep in mind your ethanol sensor will change the Commanded AFR but not the commanded EQ.

    Not saying you did not think about any of this but it may change how you view the data your are getting.
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  5. 01-15-2018 #5
    RySmDPT14
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    I had to disable my flex fuel sensor in my turbo tune, I was using 93 octane and it was telling me I have 70% alcohol. My afr was showing 8:1 at WOT so after disabling it my afr remained around 11.3:1. I also changed my PE ramp out to not be as quick which helped stabilize my afr
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  6. 01-15-2018 #6
    dwright122
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    Quote Originally Posted by RySmDPT14 View Post
    I had to disable my flex fuel sensor in my turbo tune, I was using 93 octane and it was telling me I have 70% alcohol. My afr was showing 8:1 at WOT so after disabling it my afr remained around 11.3:1. I also changed my PE ramp out to not be as quick which helped stabilize my afr
    I will make some minor changes and get some more logs. I am tuning off lamda not afr so if I set the PE enrichment for a .80 it shouldn?t matter what fuel I am running
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