Petal Commander install/review with pictures

Discussion in 'Challenger Performance Mods - Engine - 6.4L HEMI' started by cms1528, Sep 12, 2017.

  1. cms1528

    cms1528 Active Member Photo Winner! Public Safety

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    NO! It does not change any ECM features, it's plug and play only. Five mins. to install and then you're off to the races. I would remove it before you take it into a dealer for work if you had a concern.
     
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  2. Evil Dave

    Evil Dave New Member Military

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    Thanks for your review. Still waiting out the cold here to try mine. One clarification: the linear vs logarithmic comparison is about the pedal behavior in any one setting, not the shift from one setting to another.
     
  3. Evil Dave

    Evil Dave New Member Military

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    I believe either method could support 32 settings. If the PC is linear and just compressing the stock pedal action into a shorter effective pedal range, then each full increment could be broken into 1/4 non-overlapping increments, or there could be overlap, where City +4 and Sport +0 are identical, for example.

    Also, curious to see what base value range for log works well for a throttle. As others have noted, too sensitive and too sluggish are both undesireable.

    Lastly, isn't reverse log called exponential? An exponential function would have low sensitivity close to zero, but high near the physical pedal limit, bc the curve is concave w respect to the X axis. A log function is the opposite, Y rises steeply from 0 then flattens approaching the physical limit of X (full pedal), bc the curve is convex to the X axis. Folks have complained of off-zero jumpiness (oversensitivity) with the highest PC settings, which would not be indicative of an exponential function.

    Tx
     
    Last edited: Jan 2, 2018
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  4. TheOldGuy

    TheOldGuy Will Fabricate Anything For Space Shuttle Ride Site Supporter Level 3 MOTM Winner!

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    You explained it perfect. It just operates backwards. Today I added about 20 lines of code and had the entire travel of the pedal of the Ram 2500 in just a 1/4 inch of travel. I can do donuts just by touching the pedal. Its incredible albeit dangerous. It is really aggressive. I AM NOT leaving it that way. I just had to test something. I got to go unplug it before it gets dark out. It's nice having heat in the garage.

    -John
     
  5. Evil Dave

    Evil Dave New Member Military

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    At least you are testing on a RAM and not a Hellcat. We'd like you to stick around for a while.
     
  6. Evil Dave

    Evil Dave New Member Military

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    You never answered why car engineers might seek linear behavior for driver controls. I believe the answer is safety and driver predictability, because a linear function is predictable across its range from any starting input to any ending input value. The vast majority of drivers would find this easier to control because no matter whether you are at: 0 pedal, half pedal, or approaching full throttle, you can expect the same output behavior for each increment of pedal change. A driver could adapt to a variably sensitive pedal, but at any speed you want a pedal that is comfortably controllable via foot. I don't want 3/4 throttle in top gear, at 120 mph, to be over sensitive, and off-idle, in first gear, I don't want a sluggish response. When you adjust an exponential function to accommodate these desires, I believe you'll approach a flattened curve that fairly approximates y=nx across the range of allowed outputs. i imagine you could chose different functions or parameters, based on how quickly x is changing, to mitigate...

    Maybe we are hijacking this thread. I've been accused of worse.
     
    Last edited: Jan 2, 2018
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  7. TheOldGuy

    TheOldGuy Will Fabricate Anything For Space Shuttle Ride Site Supporter Level 3 MOTM Winner!

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    Hijacking the thread? Why? it's all the same stuff! And yes it is linear. Because I'm working alone, I set up a camera looking at the throttle body valve with the intake boot off and the response of the valve is directly linear according to pedal position. I had to know this before I started messing around with this whole project.
    Ya know... back in the day when we had mechanical linkages, the 3 deuces carburetor setup on a lot of systems were a log function. The first half or more of the pedal travel was just the center carburetor and then a stud would grab the linkage for the front and rear carb and open them fully in the last section of pedal travel. Watch the video carefully and you will see what I mean.


    -John
     
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  8. Evil Dave

    Evil Dave New Member Military

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    I was just joking, bc ShooterJGS griped earlier.
     
  9. DCTA2017

    DCTA2017 Member Military

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    Need help ASAP! Trading the car in and getting a 392 T/A. I can’t get the plug removed from pedal commander that goes directly into the gas pedal plug in. Does the red need to be pulled out or pushed in on the pedal commander plug going into gas pedal.
     
  10. shooterjgs

    shooterjgs Active Member Military

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    Can't tell but from the pics it looks like it needs to be pulled... Hope you get it done.
     
    Last edited: Jan 12, 2018
  11. DCTA2017

    DCTA2017 Member Military

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    Is there a trick to pop off those two tabs to let the felt cover down? I don’t want to screw this one up. Cover wise
     
  12. cms1528

    cms1528 Active Member Photo Winner! Public Safety

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    Push the red tap up to unlock the plug. Then pull the plug to separate. The felt cover is not really attached to anything, if I recall correctly just be gentle with it.
     
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  13. DCTA2017

    DCTA2017 Member Military

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    This felt cover is being a nightmare for me. Those two flat plastic screws won’t release
     
  14. cms1528

    cms1528 Active Member Photo Winner! Public Safety

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    Sorry for your trouble but I did not have to go through any felt covers that were attached to anything I can remember.
     
  15. Granite Ghost

    Granite Ghost Member Public Safety

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    His is a '17, and yours is an '11. I'm guessing the earlier models configured things a little differently regarding panels under the dash, etc. Just a guess. My '16 has the panel of which he speaks. It's basically a filler panel, below the main dash panel, that covers all the wiring, etc. under the dash. :)
     
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  16. shooterjgs

    shooterjgs Active Member Military

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    That's got to be it cause mines a 13 and I'm not seeing it also...
     
  17. Granite Ghost

    Granite Ghost Member Public Safety

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    Yup. I went out to look at mine, and was gonna pull on the plug to get the answer to his question. Then I remembered and saw the panel, and didn't wanna hassle with pulling it apart. You can't even see the harness, or anything else under there, without removing the lower panel. If yours doesn't have it, it probably started with the other major revisions starting in '15. Just a guess.
     
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  18. cms1528

    cms1528 Active Member Photo Winner! Public Safety

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    Yep, like I said I didn't have to go through a panel to get to the plug. Is the panel held in place by those christmas tree type retaining plugs?
     
  19. Derecho

    Derecho New Member

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    I've got a 2016 SXT Plus I installed the Pedal Commander on and that panel was actually pretty easy to remove - for me anyway; you just have to pull down firmly but evenly on the panel area surrounding each plastic pin. Don't jerk it, but pull down with even, but firm pressure. The fiberboard panel will pull right off. Those pins are friction lock type pins, not screw on's. When they are still new and have never been taken off before they can feel like they won't come off, but with gentle applied downward pressure working from side to side on each pin the panel will detach without damage. Another tip that might help you is to pull down the edge of the panel and slide your finger tips inside the panel as close to the pins as you can get them while pulling down...and work side to side to bring the panel down and off evenly so it doesn't bind from being crooked.

    To reinstall, simply line up the pin and press firmly back into place. Hope this helps!
     
  20. DCTA2017

    DCTA2017 Member Military

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    Got it fixed. Yeah. I did some minimal damage to the panel. But it’s not something someone would see. So I’m not concerned with it. Once it put it back in place. All is well. Thanks for the tips. Finally did get it installed. Still getting used to there not being a clutch. Left foot has ventured to the unknown clutch territory a few times. Lol
     
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