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    joegold100

    GPS in a straight line with excellent satellite triangulation is accurate enough

    GPS on a a twisty mountain trail is no where close to being accurate
    Look at this new section of trail I recorded on my Garmin Oregon

    This is with my GPS set to record a track point as fast as it can to get as many track points as is possible.

    The trail is not squared off like the gps shows
    It is rounded.

    The GPS cuts corners and looses distance.

    A properly calibrated wheel sensor that stays in contact with the ground is way more accurate than the GPS that we consumers use.


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      Originally posted by EL34 View Post
      joegold100

      GPS in a straight line with excellent satellite triangulation is accurate enough

      GPS on a a twisty mountain trail is no where close to being accurate
      Look at this new section of trail I recorded on my Garmin Oregon

      This is with my GPS set to record a track point as fast as it can to get as many track points as is possible.

      The trail is not squared off like the gps shows
      It is rounded.

      The GPS cuts corners and looses distance.

      A properly calibrated wheel sensor that stays in contact with the ground is way more accurate than the GPS that we consumers use.

      It's almost impractical to properly calibrate a wheel sensor without gps - not impossible but impractical... then again it depends on how accurate you want

      For consumers on bicycles the garmin approach of continually doing a wheel circumference calibration from longer baseline GNSS reception is likely the best approach and very accurate. The real-time speed is entirely based on the wheel speed but it is also calibrating the wheel in real-time - you could lose air pressure and it will compensate

      Phones' GPS are the worst mostly because of lousy antenna subsystems with high multipath susceptability and below par signal reception

      In cars and motos the speedometer are deliberately set to read a little high, more so on motos so even a consumer GPS is likely better, at least most of the time

      OTOH there are industrial GNSS systems that will blow everything out of the water in terms of speed accuracy. Even the "lower-end models" will track well over 800 signals and have a speed accuracy <3cm/s (<~0.04mph) and update at 100 times per second (vs. 1 per second consumer) - e.g. https://hexagondownloads.blob.core.w...duct-Sheet.pdf

      Even the unicorn of a well calibrated wheel speed sensor can't match that!

      Comment


        I was talking about bike meters that you can set the wheel circumference
        That type of meter is going to give you way more accurate mileage than GPS can on non straight/curvy paths

        Post #89 on this page is an example of this
        https://electricbike.com/forum/forum...-x1-mods/page3

        I knew the X1's mileage was not correct because of a ride I had done many times and knew the mileage

        In post #89 I reported this
        I set up a bike meter on the front wheel using a magnet sensor
        I rolled out the bike on the floor with me on it to get the wheel circumference
        The tire pressure was set before I did this

        The X1 mileage was 35.6 miles
        The Garmin Oregon GPS mileage was 31.67 miles
        The bike meter mileage was 33.4 miles

        33.4 miles is way closer than the other two figures
        Last edited by EL34; 07-02-2021, 09:21 AM.

        Comment


          Originally posted by EL34 View Post
          I was talking about bike meters that you can set the wheel circumference
          That type of meter is going to give you way more accurate mileage than GPS can on non straight/curvy paths

          ...
          There are just too many variables - there are going to be times when a GPS is better (the oregon is not a terribly accurate one and has a lot of susceptibility to multipath) and times when a wheel speed meter is better

          Did you set your GPS to log at one point per second or did you have the logging set to "auto"? That makes a big difference and I wouldn't trust what the oregon reports on the UI regardless, I'd look at the 1pt/sec log data for the distance and would expect what the oregon reports to be low. I'd also look at the log and if any of the 1pt/sec data points are obviously bad, remove them from the log.

          The oregon supports the wheel speed sensor, did you try it with that: https://buy.garmin.com/en-US/US/p/pn/010-12843-00 that may give you the best results although I'd still set it to log at 1pt/sec too

          You have posted three numbers but how do you *know* what the actual distance is? What is the gold standard you are comparing too?


          I'm not asking all this to be awkward, it's part of what I do professionally so I tend to look at this stuff very critically, so no offense meant

          Comment


            Here in the Pacific Northwest we need to have fenders for our bikes as it is wet and muddy most of the year. Has anyone put fenders on the X1, if so how are they working out. Especially interested in a good fit for a rear fender. Can take the fender off for the Summer months.
            Still waiting for the new X1 to ship.

            Comment


            • neo
              neo commented
              Editing a comment
              Did you end up picking a fender? I'm in the PNW and looking for a rear fender. I got the mucky nutz fender and it isn't long enough.

            Hello everyone.. today I experienced a error 5 on my x1… it was pretty random… can’t think of anything out of the ordinary that would cause this… connections seem done any suggestions?

            Comment


              Originally posted by jjdicecco View Post
              Hello everyone.. today I experienced a error 5 on my x1… it was pretty random… can’t think of anything out of the ordinary that would cause this… connections seem done any suggestions?
              I don't know what Error code 5 is?
              This is the error code list that I have

              Click image for larger version

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              • jjdicecco
                jjdicecco commented
                Editing a comment
                I found an error code 5 as a throttle error which is weird because I never use the throttle … I unplugged it the day I received my bike … I was caught in bad rain driving home the other day not sure if water found it’s way to the module that controls the throttle/display causing this? I’m a little baffled lol… thank you for the response

              I unplugged my throttle also a long time ago.
              I put some electrical tape over the plug
              No issues ever with that so far

              Comment


              • jjdicecco
                jjdicecco commented
                Editing a comment
                Yeah I did the same thing I wonder if the water shorted it out… because it’s the same wiring harness… hmmmm any thoughts?

              The water would have to be in a small puddle in order to short across a couple pins
              I would think you could just bang the connector a couple times and all water would go out.

              I would pull the motor side cover off and dry out all the connectors on all the wires

              Comment


              • jjdicecco
                jjdicecco commented
                Editing a comment
                So after a while of Messi g around error 5 code is gone but now the speedo is erratic

              • jjdicecco
                jjdicecco commented
                Editing a comment
                scratch that the error code is back

              I blew the X1 drivetrain out this morning in the 100 °F desert heat. Luckily, I had already completed 3 miles of the climb and was able to pedal back without PAS. I'm not sure what broke yet but it sounds to me like it's most likely the plastic "Silent Gear" upgrade. It sounds and feels like a few teeth broke off. I wasn't even riding hard at all.

              Looks there is 6 months warranty on motor and components so I'm hoping this should be covered since I've only had the bike for 3 months. However, if it's that silent gear upgrade, I think I will replace it with the factory metal gear.

              I will update this post once I get word back from Luna Support tomorrow... Stay tuned....





              BIKE RIDEZ SOCIAL:

              - YOUTUBE: https://thebikeridez.com
              - FACEBOOK: https://www.facebook.com/thebikeridez/
              - INSTAGRAM: https://www.instagram.com/thebikeridez/
              Last edited by joegold100; 07-11-2021, 01:41 PM.

              Comment


              • joegold100
                joegold100 commented
                Editing a comment
                Incredible news to report on this issue! - I broke the Peek Gear on a Sunday. I shipped my Bafang motor back to Luna Cycle on Tuesday. It arrived at their shop on Wednesday. By Thursday morning it had already been repaired and shipped back to me on Friday. It arrived at my door today (Saturday) morning! Is that insane or what? I can't tell you how happy I'am with Luna Cycle support and repair. These guys are amazing! If there is anyone out there who is reading the X1 forum and trying to decide whether they should buy an EMTB from Luna Cycle or direct from a Chineese company, use my experience with this repair as a lesson. Could you even imagine how long my bike would have been broken if I had to ship my motor back to mainland China? If you have ever shipped anything to China you also already know that the only way to track an item is to use air shipment from any of the big carriers. A 10 lb. item like the motor would have cost me about $350 each way to ship to China and back. Then just think of all the time it would have taken to repair it and get back to me. I would estimate 2-3 months. Let's just also consider that it is the summer right now. Everyone is riding hard and likely there are a lot of repairs coming into Luna Cycle at this time. The fact that their customer service and repair techs are that good to do a turn around on a warrantee repair right now speaks volumes for just how great this company is. Thank you Paxtana! You and your team are excellent. I'm extremely grateful for the excellent support that you and your team provide.
                Last edited by joegold100; 07-17-2021, 03:03 PM.

              • paxtana
                paxtana commented
                Editing a comment
                Glad we could help :)

              • KTMracer63
                KTMracer63 commented
                Editing a comment
                The gear from Bafang m600 is now a steel gear (it used to be nylon a few years back and melting regardless of output)....
                Good video from 2019....https://www.youtube.com/watch?v=muSNIUXNNaQ
                Last edited by KTMracer63; 07-25-2021, 10:28 AM.

              so I ended up pulling off the cover on the side of the motor and unplugged it There was moisture in there and I saw this.
              Click image for larger version

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              • K442
                K442 commented
                Editing a comment
                Believe that is your 'shunt mod' for ludicrous option. Done 'aftermarket' and the amber colored solder flux was not cleaned off. Not ideal, but not likely hurting anything, either. Photo is a little small/low res to tell if there is any additional issue there. If water got in, a main concern would be any white/fluffy/crusty deposits on the board - especially if they happen to be between adjacent pins on any of the smaller components on the board. Typical example: https://www.westaby.net/cleaning_images/before%202.JPG

              Do X-1s have serial numbers, and if so, where would I find it? I've looked in all the usual places with no luck. I'm posting my medium-frame X-1 on Craigslist and they're asking for S/N. Will see if they accept it without, but it would be nice to have in any case. Keeping my large-frame!

              Comment


              • paxtana
                paxtana commented
                Editing a comment
                The motor has a serial. That's it.

              • bengreens
                bengreens commented
                Editing a comment
                Thanks, paxtana!

              Think I finally solved my sudden shutdown / sudden dying / no error codes issue! May have to make a post to gather all info and details, but since I first mentioned it here in this thread...
              https://electricbike.com/forum/forum...489#post125489

              TL;DR version - The bike started 'cutting out' / going completely dead whenever moderate power is drawn for pedal assist. This first started last December at 25-30% battery charge, but then it started happening once or twice a month at generally higher charge levels...40, 50, 60%+. Finally it died one day in June with 76% battery - and wouldn't come back on. This was accompanied by a 'burnt electronics' smell coming from the controller end of the battery pack and about 2.5V at the terminals, instead of the expected ~52V.

              I ended up tearing down the pack and measuring each parallel group individually...all were ~4.1 V, except for groups 11, 12 and 13. They were about 3.65volts. So apparently the BMS wasn't charging / equalizing those groups effectively - and they were probably going under voltage when higher power was drawn, resulting in the controller shutting down.

              In order to save the pack, I went ahead and bought a new BMS...and what the heck... 14S BMS is essentially the same price as 13S BMS - so figured I might as well throw one more parallel battery group in series while everything was torn down!

              So back from a Sunday evening ride and seems to be working much better. No cutouts and more power!

              Comment


                Curious, any word or update on the July, 2021 ship date? I know there is a delay but wondering if anyone has a revised ship/est receive date - I’m excited to get my new X-1!

                Comment


                • paxtana
                  paxtana commented
                  Editing a comment
                  Currently the shipment is still on the water. Should arrive to the shipping port any day now. Then it will be clearing customs, then drayage to warehouse, then shipping and any requested mods will begin. Thank you for your patience so far.

                Thanks Paxtana, I’m excited to become a member very soon

                Comment

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