Announcement

Collapse
No announcement yet.

I feel stupid for asking this, but I am getting used to it. Regarding Perfect Pass

Collapse
X
Collapse
 
  • Page of 1
  • Filter
  • Time
  • Show
Clear All
new posts
Previous template Next
    #1

    I feel stupid for asking this, but I am getting used to it. Regarding Perfect Pass

    I have never been around an operating Perfect Pass (or any other cruise control).

    Regarding the mechanical portion of it:

    As you move the mechanical throttle and get close to the set point and it beeps, I assume it activates the servo and then holds tension right there to keep the throttle setting where it needs to be for the set speed. This is correct?

    From all the installation images I have seen, it looks like the PP cable "butts up" to the end of the actual throttle cable--so it essentially works in the opposite direction.....?

    HERE IS WHAT I WONDER: when you adjust PP speed by clicking up and down, does it physically move the entire throttle mechanism? In other words, since it is all connected, does the throttle control lever move slightly as well when the servo adjusts the throttle?

    So you can't move the throttle lever after Perfect Pass activates? By what I see, that would move everything and mess it up?

    I told you the question was stupid. I know watching one work would be worth a thousand words, but I don't have one!
    Time flies like an arrow; fruit flies like bananas!
    Tags: None
    #2
    The throttle linkage test video should give you the visual you are looking for.

    Perfect pass does not move the throttle lever at the helm.

    Basically, the servo controls the cable when speed is less than where the throttle handle is, if it need speed greater that the throttle position from the throttle handle, the screen tells you the servo needs you to push the throttle further.

    It also doesn't just hold throttle it adjusts it up and down based on conditions to maintain speed.

    Watch "linkage test video" on YouTube
    linkage test video: http://youtu.be/JNqH3yETEH8
    Mods: MLA BIG Ballast System (1800+ Custom sacs, 2 500 W705 sacs under bow), Duffy Surf Flap Mod, Trimmed Swim Deck, Top-Mount Starter

    Comment

      #3
      Exactly, perfect. Thank you for this link! So the "return to idle" spring of the throttle is what pulls the throttle back allowing PP to release a little pressure and slow the boat. If PP wants to speed up, it pulls harder and opens the throttle up.

      I get it. I just wonder what happens to the slack that is created in the cable when PP slows the boat? Since it is solidly connected by cable all the way up to the helm and then also the throttle lever, how does it not move? Is the slack absorbed by the swiveling action of the linkage (since the movement is so small)?

      The main reason I ask is, if you had a mechanical throttle setup without perfect pass, the throttle doesn't spring back to idle when you let go of the throttle lever (even though the spring is trying to do this), the friction in the lever prevents this. How in the PP setup is this friction overcome? Or does the swiveling linkage allow for slight throttle movement without pushing the cable....

      I hope this makes sense. Of course I am overthinking it.

      Originally posted by Stingreye View Post
      The throttle linkage test video should give you the visual you are looking for.

      Perfect pass does not move the throttle lever at the helm.

      Basically, the servo controls the cable when speed is less than where the throttle handle is, if it need speed greater that the throttle position from the throttle handle, the screen tells you the servo needs you to push the throttle further.

      It also doesn't just hold throttle it adjusts it up and down based on conditions to maintain speed.

      Watch "linkage test video" on YouTube
      linkage test video: http://youtu.be/JNqH3yETEH8
      Time flies like an arrow; fruit flies like bananas!

      Comment

        #4
        Or maybe the throttle cable is floppy enough that it doesn't matter. It can't "push" it can just "pull".

        Maybe I just answered my own question.
        Time flies like an arrow; fruit flies like bananas!

        Comment

          #5
          Imagine a basket suspended by two ropes. Pull on either one and you life the basket. When you accelerate the perfect pass allows its rope to extend, so when you press the throttle it's rope extends. Then perfect pass says that basket has been lowered too far, so it pulls back on its rope. The throttle cable is now slack, so it doesn't do anything. Perfect pass now tries to drop the basket past the the length of the rope. It can't because now the throttle rope suspends the basket. Now practical example. Perfect pass is controlling the height of the basket, you slam it in neutral which yanks the throttle rope all the way up and perfect passes cable is loose.

          My perfect pass cable got caught on another wire preventing me from getting full throttle when perfect pass was on. Confused the heck out me, thought I had a bad servo but it was just the power cable to the servo that blocked the cable for perfect pass.
          Mods: MLA BIG Ballast System (1800+ Custom sacs, 2 500 W705 sacs under bow), Duffy Surf Flap Mod, Trimmed Swim Deck, Top-Mount Starter

          Comment

            #6
            Originally posted by dakota4ce View Post
            Or maybe the throttle cable is floppy enough that it doesn't matter. It can't "push" it can just "pull".

            Maybe I just answered my own question.
            Yes that sounds right! I wrote my other answer before reading this one!
            Mods: MLA BIG Ballast System (1800+ Custom sacs, 2 500 W705 sacs under bow), Duffy Surf Flap Mod, Trimmed Swim Deck, Top-Mount Starter

            Comment

              #7
              Awesome explanation. Thank you. I think for some reason I was thinking the throttle cable was stiff (stupidly), like a steering cable. It is floppy, and exhibits no pushing at all. The spring of the throttle mechanism is the counter force to the system (like gravity in your basket scenario). Always trying to pull the throttle to idle, while PP and the lever duke it out to see who is pulling toward WOT.
              Time flies like an arrow; fruit flies like bananas!

              Comment

                #8
                The other key thought (I think) is that PP calls for lever movement when it needs it. Such as in accelerating past the limit the throttle cable has established.
                Time flies like an arrow; fruit flies like bananas!

                Comment

                  #9
                  Originally posted by dakota4ce View Post
                  The other key thought (I think) is that PP calls for lever movement when it needs it. Such as in accelerating past the limit the throttle cable has established.
                  Correct on my old one (wakeboard pro) it has a # sign indicating that perfect pass wants more throttle but can't get it because the throttle isn't engaged enough. Press throttle further and # sign goes away.
                  Mods: MLA BIG Ballast System (1800+ Custom sacs, 2 500 W705 sacs under bow), Duffy Surf Flap Mod, Trimmed Swim Deck, Top-Mount Starter

                  Comment

                    #10
                    I think what he is asking is if PP is engaged and there is slack in the mechanical throttle cable, does the throttle assay become loose at the helm? Such as it feels like there is no tension on the throttle until you push it past the PP servo setting.

                    My axis is drive by wire, I just give it half 1/4-1/2 throttle and let the speed control do it's thing. I can't bypass the cruise control to go faster though, I have to turn it off first.

                    Comment

                      #11
                      I think my feeble little brain has a grasp on this now--then I went and looked at the Hydrophase cable setup, where they run parallel to your throttle cable and pull in the same direction......

                      Thank you gentlemen for your explanations!
                      Time flies like an arrow; fruit flies like bananas!

                      Comment

                        #12
                        Working in the boat now. Here are some pics of it on mine.

                        First pic throttle at idle, perfect pass doing nothing
                        20141102_195616.jpg
                        Second throttle at wot, perfect pass doing nothing. You can see the throttle on the throttle body has moved.
                        20141102_195642.jpg
                        Third pic, I turned the servo on the perfect pass to show. It extends the throttle cable creating slack allowing the throttle to return to neutral.
                        20141102_195702.jpg

                        Hope that helps☺
                        Mods: MLA BIG Ballast System (1800+ Custom sacs, 2 500 W705 sacs under bow), Duffy Surf Flap Mod, Trimmed Swim Deck, Top-Mount Starter

                        Comment

                          #13
                          The pp cable doesnt move the throttle, as the cable is winding up where the knob is ,it forces the outter housing too move against the throttle lever , also you are supposed to move the throttle lever past the speed you want and then pp will bring it to the speed you requested, if you dont move the shift lever past the speed you need it puts undo pressure on the cable when you go into a turn when it wants to speed up, I hope you can see that the outter housing is what moves, thats why you always have to make sure that the cable housing is unabstructed.

                          Comment

                          Previous template Next
                          Working...
                          X