Page 3 of 9 FirstFirst 1234567 ... LastLast
Results 41 to 60 of 179

Thread: Perplexing PLX !!**??

  1. #41
    Senior Tuner S2H's Avatar
    Join Date
    Apr 2005
    Location
    Schexnayder Racing - Arnaudville LA
    Posts
    4,387
    Quote Originally Posted by Dirty Howie
    Here is the ride back home today where the temps were a little warmer and the AFR 16 instead of 16.6

    So what can be gleaned from these logs????? Are the 02's working correctly????

    Does anyone want to change their opinions of the PLX being bad

    Scott..............


    DH

    try this

    O2 switchpoint table
    Mode - 0 | 2 | 4 | 6 | 8 | 10 | 12 | 14 | 16
    mVolts - 835 | 835 | 835 | 835 | 845 | 850 | 855 | 855 | 855

    I know it looks odd...
    but do another closed loop log after this...

    and post it up here...

    this may be a little much of a change....but Its only the first pass and I may need 1 or 2 more to get it correct

    please do this in a similar weather condition and temperature as your previous closed loop file if you can
    -Scott -

  2. #42
    Not A Tuner
    Join Date
    Oct 2006
    Posts
    977
    Quote Originally Posted by soundengineer
    try this

    O2 switchpoint table
    Mode - 0 | 2 | 4 | 6 | 8 | 10 | 12 | 14 | 16
    mVolts - 835 | 835 | 835 | 835 | 845 | 850 | 855 | 855 | 855

    I know it looks odd...
    but do another closed loop log after this...

    and post it up here...

    this may be a little much of a change....but Its only the first pass and I may need 1 or 2 more to get it correct

    please do this in a similar weather condition and temperature as your previous closed loop file if you can
    Scott

    I have no problem making multiple changes and logs.....I drive twice daily 30-60 minutes

    Didnt you already have me change the mode tabe???? Below is what is in the tune I set up for your testing.

    I can't seem to find the mV table ...... please assist me !!!!


    DH

  3. #43
    Супер Модератор EC_Tune's Avatar
    Join Date
    Apr 2003
    Location
    Almost 2000 feet.
    Posts
    7,876
    DH - the tables Scott is referencing is at the upper middle of the Open/Closed loop tab.
    Attachment 6369

    However with Scott's settings I expect your fuel economy to drop a tad. And problem is there are limiters that we don't have access to so those settings are probably outside of the limits anyway.
    Always Support Our Troops!

  4. #44
    Senior Tuner S2H's Avatar
    Join Date
    Apr 2005
    Location
    Schexnayder Racing - Arnaudville LA
    Posts
    4,387
    Quote Originally Posted by EC_Tune
    DH - the tables Scott is referencing is at the upper middle of the Open/Closed loop tab.
    Attachment 6369

    However with Scott's settings I expect your fuel economy to drop a tad. And problem is there are limiters that we don't have access to so those settings are probably outside of the limits anyway.
    thats the part I am worried about....
    limiters that we dont have access to...
    on my own Fbody car I didnt run into them.....atleast I dont think I did...
    but that doesnt mean that I wasnt hitting them at some point


    and correct...
    the fuel economy will drop some....
    but no more than if he were in full time open loop and just following his wideband
    -Scott -

  5. #45
    Супер Модератор EC_Tune's Avatar
    Join Date
    Apr 2003
    Location
    Almost 2000 feet.
    Posts
    7,876
    But we're still at a quandry: Is the wideband correct at cruise? I think not as I tuned the car OLSD & OLMAF then turned on closed loop. Fuel economy went in the toilet in OLSD & OLMAF with a "perfect" OLSD & OLMAF tune.

    When I went closed loop, fuel economy returned but the fuel trims were negative in the "normal driving: 20-70 Kpa, idle to 3200 RPM" areas. WOT was "normal" as well since it was tuned with the wideband.
    Always Support Our Troops!

  6. #46
    Not A Tuner
    Join Date
    Oct 2006
    Posts
    977
    Quote Originally Posted by EC_Tune
    DH - the tables Scott is referencing is at the upper middle of the Open/Closed loop tab.
    Attachment 6369
    Thanks Doug

    I don't think Scott understands that he has to hold my hand ..........


    DH

  7. #47
    Not A Tuner
    Join Date
    Oct 2006
    Posts
    977
    Scott

    Here is the tables and tune set as you want (I hope)

    I will do a log on the way home and post it tonight.

    Thanks


    DH

  8. #48
    Not A Tuner
    Join Date
    Oct 2006
    Posts
    977
    Here is the log.

    What I see is the non-PE is very consistant but about the same as before this calibration (POST #27)

    Why is my AFR so much closer to 14.7 when I was running hard at the track (POST #39)

    There is a WOT pull to 122mph at frame 9700. Are the 02's reading correctly here.....can you tell???


    DH
    Last edited by Dirty Howie; 06-01-2007 at 08:41 PM.

  9. #49
    Not A Tuner
    Join Date
    Oct 2006
    Posts
    977
    Quote Originally Posted by Dirty Howie
    Here is the log.

    What I see is the non-PE is very consistant but about the same as before this calibration (POST #27)

    Why is my AFR so much closer to 14.7 when I was running hard at the track (POST #39)

    There is a WOT pull to 122mph at frame 9700. Are the 02's reading correctly here.....can you tell???


    DH
    Scott.......anybody???

    No opinions, suggestions for different logs.....anything????


    DH

  10. #50
    Senior Tuner S2H's Avatar
    Join Date
    Apr 2005
    Location
    Schexnayder Racing - Arnaudville LA
    Posts
    4,387
    I'll look at it later tonight when I get home....
    from the picture...I think were not gong to get there from here....
    hitting hidden limits inside the pcm...

    I'm not sure of what thos limits are set at or if they can even be changed...

    might be time for me to make a special request question to somebody to see what is actually going on there
    -Scott -

  11. #51
    Senior Tuner S2H's Avatar
    Join Date
    Apr 2005
    Location
    Schexnayder Racing - Arnaudville LA
    Posts
    4,387
    and I am starting to question the PLX wideband...

    time for me to figure out the PLX mysteries...
    I might need some details from PLX website and do some checking with their Tech support....
    -Scott -

  12. #52
    Not A Tuner
    Join Date
    Oct 2006
    Posts
    977
    Quote Originally Posted by soundengineer
    and I am starting to question the PLX wideband...

    time for me to figure out the PLX mysteries...
    I might need some details from PLX website and do some checking with their Tech support....
    Scott

    Call Vic at 650-704-0771

    He is the one I actually bought my PLX from. He handles tech questions for PLX. AND he is a TUNER. So you two should be able to comunicate.

    I told him I was going to be addressing this issue here on HPT site.

    That would be awsome of you to call him

    I'm going to check my voltage readouts to make sure there isn't a wiring problem as I now own a multimeter...


    DH

  13. #53
    Senior Tuner S2H's Avatar
    Join Date
    Apr 2005
    Location
    Schexnayder Racing - Arnaudville LA
    Posts
    4,387
    yeah...from the looks of the log it seems we are hitting the limits of your vehicle...
    I dont know if calling vic will do me any good....but I'll try him later this week if I have the spare time...

    let me do som emore investigating...
    -Scott -

  14. #54
    Not A Tuner
    Join Date
    Oct 2006
    Posts
    977
    Quote Originally Posted by soundengineer
    yeah...from the looks of the log it seems we are hitting the limits of your vehicle...
    I dont know if calling vic will do me any good....but I'll try him later this week if I have the spare time...

    let me do som emore investigating...
    Okay Scott

    Just for the hell of it I am going to redo my VE and MAF tables.

    I will put the O2 switch points back to where they were.

    How about the airflow mode table?? Back to where it was or as you had me reset it above??

    Thanks for investigating........


    DH

  15. #55
    Senior Tuner S2H's Avatar
    Join Date
    Apr 2005
    Location
    Schexnayder Racing - Arnaudville LA
    Posts
    4,387
    Quote Originally Posted by Dirty Howie
    Okay Scott

    Just for the hell of it I am going to redo my VE and MAF tables.

    I will put the O2 switch points back to where they were.

    How about the airflow mode table?? Back to where it was or as you had me reset it above??

    Thanks for investigating........


    DH

    ok...so today I had a chance to tune a friends car..
    I did a compare with his car and a log I have from when it was stock..
    one stock log before mods was dead on AFR with O2 closed loop operation
    modded car was way off from each other...
    I'm using an LC1...
    so its not the PLX's problem if I can create the same issue with a different wideband...
    -Scott -

  16. #56
    Advanced Tuner
    Join Date
    Dec 2005
    Location
    Sydney Australia
    Posts
    510
    what cams do these cars have in them??

    you do realise a wideband will not be accurate at lower rpms with a cam with a lot of overlap as the raw oxygen in the pipes will cause the WB to read funny

  17. #57
    Not A Tuner
    Join Date
    Oct 2006
    Posts
    977
    Quote Originally Posted by soundengineer
    ok...so today I had a chance to tune a friends car..
    I did a compare with his car and a log I have from when it was stock..
    one stock log before mods was dead on AFR with O2 closed loop operation
    modded car was way off from each other...
    I'm using an LC1...
    so its not the PLX's problem if I can create the same issue with a different wideband...
    How far apart in time/miles/usage were the logs?

    I was thinking that in some instances like mine where my car is run VERY hot and WOT at my 2 hour track events every month ...... degredation of the O2 sensors maybe. Thats why I put up the recent AFR histograms a few posts back from last weeks track event.

    Anyways Doug is going to argue same car/mods then change WB gets good proper readings.

    And there must be MANY moded cars that read properly in CL


    DH

  18. #58
    Not A Tuner
    Join Date
    Oct 2006
    Posts
    977
    Quote Originally Posted by VYSSLS1
    what cams do these cars have in them??

    you do realise a wideband will not be accurate at lower rpms with a cam with a lot of overlap as the raw oxygen in the pipes will cause the WB to read funny
    I think my cam is considered pretty mild....... COMPCAM 224/228 @114 .581 (I think)


    DH

  19. #59
    Супер Модератор EC_Tune's Avatar
    Join Date
    Apr 2003
    Location
    Almost 2000 feet.
    Posts
    7,876
    Yes in a 402 that is VERY mild.
    You can trust the narrowbands with your cam. As long as the o2 switching seems "normal" and doesn't hang, then the narrowbands are right on at idle/cruise etc.

    Obviously at WOT the NB's are useless but that's why we have widebands.
    Always Support Our Troops!

  20. #60
    Senior Tuner S2H's Avatar
    Join Date
    Apr 2005
    Location
    Schexnayder Racing - Arnaudville LA
    Posts
    4,387
    Quote Originally Posted by VYSSLS1
    what cams do these cars have in them??

    you do realise a wideband will not be accurate at lower rpms with a cam with a lot of overlap as the raw oxygen in the pipes will cause the WB to read funny
    its happening at all rpm's involving closed loop operation at 14.7
    and happening on several brands of wideband...4 that I have seen now...
    -Scott -