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Thread: Read HPTuners Tune with EFILive. 2 Bar

  1. #81
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    Quote Originally Posted by joecar View Post
    Looks like it will do serial comms, page 2 shows a diagram showing Rx/Tx...

    I can't tell from here...

    if you can connect the PLX to a PC via serial comms and talk to it from the PC, then you need the null modem functionality (i.e. swapping Rx and Tx).
    It does. But they are using a USB to connect to a PC.
    Old numbers with 422 Iron Block
    10.84 @ 124 MPH, 1.57 60\'
    549 RWHP / 757 RWTQ
    I'd rather be blown ... AND stroked!
    Now: 441 CID (Corevette 427) , ATI Procharger D-1SC Supercharger

  2. #82
    Lifetime Member 5.7ute's Avatar
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    Wasn't there an issue with the voltages from the plx serial connections that had to be addressed. Hence the chip that needed to be soldered to the board in the PLX controller.
    The Tremor at AIR

  3. #83
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by 5.7ute View Post
    Wasn't there an issue with the voltages from the plx serial connections that had to be addressed. Hence the chip that needed to be soldered to the board in the PLX controller.
    You're right...

    I don't know if this new model PLX comes already fixed from the factory, or if it has the same problem.

  4. #84
    Lifetime Member 5.7ute's Avatar
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    I have one of these units on the way as my LM-1 is finally playing up. Hopefully you guys will work it out before mine gets here lol.
    The Tremor at AIR

  5. #85
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    Default Bug in sae_generic.txt

    I hooked up my Wideband using the Analog input to the V2, and since the voltage seemed pretty stable, I decided to go with that for the moment.

    When I could not get WideBand AFR 1 - PLX {CALC.AFR_PLX1} to be recognized, (because it could not see Ext. AD1), which would, as a consequence, make BEN invalid, I touched base with JoeCar for some advice about it.

    He thought there might be a bug in SAE_generic.txt (he was on a drive, so could not check himself.) With that clue, I looked into SAE_generic.txt and discovered:

    # PLX WBO2
    # ================================================
    *CLC-00-953
    V 0.0 5.0 0.1 "{EXT.AD1}"
    AFR 10.0 20.0 0.2 "{EX.AD1}*2.00+10.00"
    *CLC-00-954
    V 0.0 5.0 0.1 "{EXT.AD1}"
    AFR 10.0 20.0 0.2 "{EX.AD2}*2.00+10.00"

    I changed it to the below, and it worked:

    # PLX WBO2
    # ================================================
    *CLC-00-953
    V 0.0 5.0 0.1 "{EXT.AD1}"
    AFR 10.0 20.0 0.2 "{EXT.AD1}*2.00+10.00"
    *CLC-00-954
    V 0.0 5.0 0.1 "{EXT.AD1}"
    AFR 10.0 20.0 0.2 "{EXT.AD2}*2.00+10.00"

    There are a number of other WB parms malformed like this as well, so be aware.
    Old numbers with 422 Iron Block
    10.84 @ 124 MPH, 1.57 60\'
    549 RWHP / 757 RWTQ
    I'd rather be blown ... AND stroked!
    Now: 441 CID (Corevette 427) , ATI Procharger D-1SC Supercharger

  6. #86
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    Went looking for Bugs/Issues and lo-and-behold:

    https://forum.efilive.com/showthread...ic-Pre-Release
    Old numbers with 422 Iron Block
    10.84 @ 124 MPH, 1.57 60\'
    549 RWHP / 757 RWTQ
    I'd rather be blown ... AND stroked!
    Now: 441 CID (Corevette 427) , ATI Procharger D-1SC Supercharger

  7. #87
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    I've managed to get the car to drive well above 4% or 5% throttle and not too rich, but not too lean, even under 90% WOT (on the street with 28" tall Nitto's not allowing me to WOT). What is eluding me right now is idle or close to idle when I'm coming off the throttle.

    After warm-up, it will idle 950 to 1000 in Neutral and 800-850 in gear (sitting still). But, if I rev and take my foot off the accelerator it dips down to about 400 and won't recover before shutting off. When I'm driving, all seems well until I go to 0% throttle. Once I am below 1000 or so RPMS, it sounds almost like the car is not even running, and I have to downshift to raise RPM's as I coast to a stop or hold the throttle about 5% so it won't stall.

    I went through an Idle Tuning procedure before the PCM swap and had it idling as low as 700 with a nice lope. Now, I can't seem to get it to idle. Raising timing down low helped a bit (I tried to avoid touching timing while I was fuel tuning). But, it is not at drivability level as far as sitting in traffic would be concerned.

    I've tried some manipulation of Idle air-flow and cracker tables to no avail. (Well it has improved SOME ... it was swinging wildly before between nearly stalling and about 1400. That is gone now. But, that is as far as I've gotten.)

    Any ideas? What else should I be trying.
    Old numbers with 422 Iron Block
    10.84 @ 124 MPH, 1.57 60\'
    549 RWHP / 757 RWTQ
    I'd rather be blown ... AND stroked!
    Now: 441 CID (Corevette 427) , ATI Procharger D-1SC Supercharger

  8. #88
    Lifetime Member 5.7ute's Avatar
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    Tune file and logs would help.
    You added timing to which tables? Where is your base spark set for idle? What timing gives the best map at idle for your combination?
    The Tremor at AIR

  9. #89
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    No problem! You want the .EFI log or the Excel Spreadsheet I created?
    Old numbers with 422 Iron Block
    10.84 @ 124 MPH, 1.57 60\'
    549 RWHP / 757 RWTQ
    I'd rather be blown ... AND stroked!
    Now: 441 CID (Corevette 427) , ATI Procharger D-1SC Supercharger

  10. #90
    Lifetime Member 5.7ute's Avatar
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    Log would be better.
    The problems you are describing sound like it is just a weak idle.
    The Tremor at AIR

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