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Fabio

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Posts posted by Fabio

  2. Help on impreza gc8 settings

    in Engine Tuning

    Posted

    Hi everyone,

    I am in need of help for knock settings

    I would like to make my engine knock at low revs low loads to see if the knock is picked up by the link g4x

    I ve tried 2k rpm and maximum allowed timing but no knock occur 

    How can I do this procedure safely?

    Or someone has settings already tested and working?

    Thank you

    Fabio

  3. Help on impreza gc8 settings

    in G4x

    Posted

    https://drive.google.com/file/d/1OMTTFHcAzWgqmsOWkccmNr1QbKSDrCEQ/view?usp=drivesdk

    https://drive.google.com/file/d/1UxG82u3Efvz2GiUQIdoTwZV2xbL82DZf/view?usp=drivesdk

    Hy mapping experts, here are log file and base map with knock gain at 8 (as Adam said ) could you tell me if the readings are ok and true so I can adjust per cylinder gain?

     

    I m sorry but I have problems on understand this knock feature 

     

    Thank you

    Fabio

    I tried to change setting, now you should be able to see log and basemap 

    I noticed something else on the CLL

    I tried to increase map and tps delta lockout because as you can see on the log CLL goes to map/tps delta too much and even if delta is not over the setting.

    I don t understand why, sometimes locks on "engine cut" even If tps is over 5-6%

    Also overrun fuel cut stays active even when tps is over the settings 

    I have no idea what to do about this

     

    Thank you

    Fabio

  5. Help on impreza gc8 settings

    in G4x

    Posted

    4 hours ago, Adamw said:

    If you need gain that high then I suspect you have an issue with the sensor or wiring.  I dont remember seeing any engine that needed a gain higher than about 8.

    Even if knock sensor is stock one wire?

    So If I put a gain of say 8 and get signal around 500 high revs should be ok?

    What is the max gain per cilinder I can use?

     

    Thank you

    Fabio

  6. Help on impreza gc8 settings

    in G4x

    Posted

    17 hours ago, koracing said:

    Personally in a no-knock situation I like to see the knock values reach a maximum of about 600-700ish.  I would adjust gain until you get full range of knock readings out to that value.  Free revving in neutral at about 3000 rpm around 200 or so on the knock runtime values.

    I don't think you can copy the table in the help file - you'll just have to enter the values.

    Thank you for your help

     

    What is the maximun global gain I can use?

    With a number of 2 i get signal around 40 50 peak

    With gain 40 i get around 150 170

    Is it better to leave a low global gain and increase the individual cylinder gains?

     

    Thank you

    Fabio

  7. Help on impreza gc8 settings

    in G4x

    Posted

    16 hours ago, dx4picco said:

    Try on wastegate pressure first to have your fuel map  in the ball park.

    I usually see a difference in VE in those medium pressure when I tune firtst on gate then at normal boost. so to avoid to make it twice, once its safe to raise the boost then do it.

    the thing is when tuning on gate, let's say you will reach 160kpa, and that is with 100tps.

    once raising boost, you will likely reach those 160kpa with 60tps, and at that point VE will be lower/less efficient.

    so if you tune for gate then raise boost you will most likely be too rich at positive boost but partial throttle.

    Thank you for your response 

    I understand and believe what you said and as soon as ve is in the ballpark I will activate boost control and raise boost

    Did you happen to have a look at the knock numbers on the log?

    What peak number should Iaim for on knock signal to be correct?

     

    Thank you

    Fabio

    16 hours ago, Adamw said:

    I would turn off closed loop lambda and knock control while tuning.  Your accel fuel cold correction table has zeros in it so this needs to be fixed, it should be 1.0 at normal operating temp and say 2-5 for a cold engine.  Your charge temp approximation table needs realistic values in it before tuning, copy the example from the help file as a starting point.   

    Ok disable both,did you have a look at knock numbers on log?

    Do thei seem reasonable or shoul I increase/decrease main gain or change frequency?

    Fir the approximation table do you mean press f1 and copy a table from the help file?

     

    Thank you

    Fabio

  8. Help on impreza gc8 settings

    in G4x

    Posted

    23 hours ago, Adamw said:

    You can upload your file to a file sharing service and just post a link here.  Onedrive, google drive, dropbox, wetransfer etc.  

    https://drive.google.com/file/d/1_hnFNkSnsvMgGqCPtJnnm6V_BVKdX1bH/view?usp=drivesdk

    3 minutes ago, Fabio said:

    https://drive.google.com/file/d/1_hnFNkSnsvMgGqCPtJnnm6V_BVKdX1bH/view?usp=drivesdk

    Turbocharger is on wastegate pressure on purpouse,as soon as I know My settings are ok I will start to increase boost 

    Is it better to map ve table on low boost and increase when ve is mapped or just start with the boost Ieant to reach in the end?

  9. Help on impreza gc8 settings

    in G4x

    Posted

    On 5/20/2023 at 1:16 PM, Adamw said:

    You have a crank and cam sensor capable of 720deg cycle positioning, the ecu knows which cylinder in knocking and it can retard the spark just on the cylinder that is knocking.  

    Hy Adam, 

    I made a log and modified basemap, now car is running and I m starting tuning procedure

    May I ask you to have a look at my settings to tell me if there is something out of place or if basic settings are ok?

    Especially knock settings, now I included a log with car running

     

    Thank you for your help

    Fabio

    fabio base map startup open loop modelled (1).pclx

    Log is too big I cannot send it thru this forum,are there other ways?

  11. Help on impreza gc8 settings

    in G4x

    Posted

    Again thank you very much for your help I will try to improve things as much as I can now that I know base settings.

    Why should I assign one knock table per cylinder if my ignition system is batch fire?

    There is no the possibility to retard ignition on a single cylinder

    Am I missing something that Idon t understand on this?

    Thank you

    Fabio

    Hy Adam, 

    Sent you files, I found the problem, I left disable input on, a bit tricky to note for me.

    Anyway now knock level is negatuve number as you can see..how could it be?

     

    If you are so kind to check my knock settings and idle settings to let me know if there is something wrong I ll appreciate that 

    I just started mapping and knock settings is something I m not sure about

    Thank you

    Fabio

    Sorry forgot to ask you what numbers of knock should I aim for say from idle to limiter, some peole told me not to go over 500 at high revs others told me 50 

    If you give me a reference number I will try to tune knock signal to that

     

    Thank you

    Fabio

  12. Help on impreza gc8 settings

    in G4x

    Posted

    Hy Adam, 

    Sent you files, I found the problem, I left disable input on, a bit tricky to note for me.

    Anyway now knock level is negatuve number as you can see..how could it be?

     

    If you are so kind to check my knock settings and idle settings to let me know if there is something wrong I ll appreciate that 

    I just started mapping and knock settings is something I m not sure about

    Thank you

    Fabio

  14. Help on impreza gc8 settings

    in G4x

    Posted

    Hy all,

    Needing some help on understand why my link g4x on impreza v3 does not read knock signal, it is at 0 all the time

    Also if someone could be so kind to share idle settings because I am not able to reach a stable closed loop idle

     

    Thanks

    Fabio

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