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  1. #1
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    Issues I'm trying to solve with the N54. Suggestions would be appreciated

    1) Bank 1 and Bank 2 STFT variance and trims are high

    2) Boost error showing underboost. (no code)

    3) AFR and requested seem like struggling to match. Not sure if this deviation is normal, just due to trims or what.

    4)Fuel mixture codes and today fuel plaus code.


    Wasn't logging LPFP or HPFP in these pulls but typically do. Usually look strong. Trying to find the sweet spot with trims vs timing corrections. This tank was was E40ish and the corrections, while not too bad, were across all cylinders. E50 clears the corrections but trims get worse. Fuel scalar set for E50.




    Relevant service:

    New injectors 20k ago, new hpfp 10k, NGK plugs every 10k, inline lpfp about 30k ago, valve cleaning last week. Coils original and 70k on the clock. Replacing vac lines this weekend.

    FBO pro tuned. Current local DA about 4000 Click here to enlarge


    Injectors, solenoids, O2s, I don't know where to even start. All suggestions, advice, random thoughts, aphorisms, confucius quotes anything appreciated.




    Couple of logs from tonight. Can grab others with suggested parameters as well.
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    Please upload the cvs files to datazap. It will make it much easier for everyone to view and comment on your logs.

    Without having seen your logs, when you are getting variances between the banks in terms of fuel trims and AFR ratios there are usually 2 simple explanations/fixes. The first is resetting adaptations. The second is bad O2 sensors. I would recommend trying to reset your adaptations first. If nothing changes then you should replace both the front and rear O2 sensors for both banks.
    Stuff

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    I wouldn't be concerned about the mixture and plausibility codes. Those are common when running E85. I have them coded out on my flash so they no longer pop up.
    E92 335is DCT

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    Datazap the logs.

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    +1 on resetting adaptations.

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    "man who go through airport turnstile sideways going to Bangkok"

    sorry, I couldn't resist....
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    On my iPhone, but compare your requested vs. actual Low & High Fuel Pressures. Then compare those numbers off your Fuel Trims. Possibly that a trend might reveal itself and help you solve the problem.
    COBB AP ProTune by Bren of ///Bren Tuning
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    Appreciate the responses gentleman.

    I used coding cable and have reset all adaptations. Put approx. 100 miles on the car since and from the looks of live data it does not seem to have resolved the issue. I'll run some logs this evening with fueling parameters and see if anything becomes transparent. Will load and link to datazap.
    parameters will be both banks
    lambda
    req lambda
    stft
    ltft
    timing corr 2-5
    timing cyl 1
    lpfp
    req lpfp
    hpfp
    req hpfp
    TPS
    RPM


    any others suggested to include?

    @froop, will follow your suggestion regarding O2s if this evenings logs don't provide any insight.

    Thanks again.
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    Fuel mixture codes should not be present...if they are your scalars need adjusted. I'm guessing you're getting them at idle / lite cruise?

    Plausability code...no worries

    Why are you trying "to find the sweet spot with trims vs timing corrections?" Why not run the fuel you need to accommodate the tune you want to run? Then adjust the scalars accordingly?

    Your STFT's are too high down low, especially bank 2.
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    Click here to enlarge Originally Posted by SteveAZ Click here to enlarge
    Fuel mixture codes should not be present...if they are your scalars need adjusted. I'm guessing you're getting them at idle / lite cruise?


    Plausability code...no worries

    Why are you trying "to find the sweet spot with trims vs timing corrections?" Why not run the fuel you need to accommodate the tune you want to run? Then adjust the scalars accordingly?

    Your STFT's are too high down low, especially bank 2.

    Not certain when they appear as they are not cel or ses triggering codes.


    I'm trying to find my "sweet spot" because my scalar is set for E50 and my trims are high running E40. At E45 I have minimal timing corrections, E50 I have none, anything below e40 they seem to be more pronounced.


    I understand my trims are high in bank 2. The purpose of me creating this thread is to help me diagnose why and why only in bank 2. It seems to be a hardware issue not an issue I can solve by adjusting my scalar.
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    And what exactly is an E50 scalar? Click here to enlarge There is no standard...it's based on your specific circumstances/conditions. Trims are based on a multitude of things, I wouldn't sweat that they are "high" for your mix. I would just adjust them accordingly before I started trouble shooting hardware. Your bank 2 trims (and bank 1 for that fact) are operating above their optimal range.

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    Click here to enlarge Originally Posted by musc Click here to enlarge
    I wouldn't be concerned about the mixture and plausibility codes. Those are common when running E85. I have them coded out on my flash so they no longer pop up.
    If you got 3D scalar you should be able to tweek out the troubled area

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    Click here to enlarge Originally Posted by R.G. Click here to enlarge

    I understand my trims are high in bank 2. The purpose of me creating this thread is to help me diagnose why and why only in bank 2. It seems to be a hardware issue not an issue I can solve by adjusting my scalar.
    I made a post about this, its normal to see variances between the banks. To balance them out you will have to adjust them. So your 3D scalar tables for bank 1 & 2 will not mirror each other. There will be variances between the two tables in order to close the output gap in variance between the bank for trims

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    Click here to enlarge Originally Posted by BuraQ Click here to enlarge
    I made a post about this, its normal to see variances between the banks. To balance them out you will have to adjust them. So your 3D scalar tables for bank 1 & 2 will not mirror each other. There will be variances between the two tables in order to close the output gap in variance between the bank for trims
    @SteveAZ thanks for the replies. E50 scalar is based on Cobb's recommended parameter settings for ethanol content located in their help files.

    Thanks @BuraQ. My map was created prior to the 3d scalar tables and was only a single table per bank if I'm not mistaken. I've sent logs over to my tuner and they responded that "mechanical fuel delivery is likely an issue. Injectors and/or exhaust leak are two likely culprits". I'm guessing that since my logs didn't show this issue during tuning (approx. 1 year ago) that the only variable would be mechanical.

    Should I have the tune re done now that the 3d scalar is available? Or do you think the issue is mechanical?
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    Click here to enlarge Originally Posted by R.G. Click here to enlarge

    Should I have the tune re done now that the 3d scalar is available? Or do you think the issue is mechanical?
    IMO no it is not mechanical issue, its a tuning limitation issue which can more likely be resolved with a 3D scalar table

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    Click here to enlarge Originally Posted by BuraQ Click here to enlarge
    IMO no it is not mechanical issue, its a tuning limitation issue which can more likely be resolved with a 3D scalar table
    Got it, let me follow up with my tuner and see what they're able to do. Thanks again.
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    Tuner is looking in to it. However he brought up the valid point that since there were no deviations during the initial tuning it suggests a mechanical issue. Will wait to hear back from him and update with resolution.
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