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Messages - zian

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1
Zero Motorcycles Forum | 2013+ / Re: Strong strange noise in acceleration following belt change
« on: March 11, 2025, 02:49:06 AM »
Thanks a lot for these good infos.
Zero recommand to change the small sprocket in my case, so we will see next week after the change...

2
Zero Motorcycles Forum | 2013+ / Re: Strong strange noise in acceleration following belt change
« on: March 09, 2025, 01:07:13 AM »
:) You told about that here :
Quote
This may or may not help, or even be the same issue, but I had a similar problem I resolved by rotating the rear sprocket.
https://www.electricmotorcycleforum.com/boards/index.php?topic=11202.0

Do you remember the final result (range in Hz) ? From 10Hz to ?
So that I will have a aim.

Rotating the rear sprocket can't change the oval form, but it can change the center axis for sure and make it closer to the wheel rotation axis.

First I'll let my dealer try what Zero recommand, and if the bad noise is always there, I'll recommand to rotate the rear sprocket too as you.

3
Zero Motorcycles Forum | 2013+ / Re: Strong strange noise in acceleration following belt change
« on: March 08, 2025, 07:56:54 PM »
Thanks KuRi & 2020_SRS_Commuter for you answer, I'll study all these points.

The Rear wheel is correctly aligned, no problem with that.

My problem is exactly the same as this one : https://www.electricmotorcycleforum.com/boards/index.php?topic=12714.0

By testing the frequency of the belt with different positions of the wheel with the motorcycle on the lateral crutch, I find between 58 and 68 Hz. So now I have just understood that the cause is the crown which cannot be perfectly circular and have its center perfectly in the axis of rotation of the wheel.

The old belt (which has a small tear) has been mounted again yesterday, the sound of resonance is much less, there is therefore clearly a frequency of resonance specific to each belt, which must come to resonate with the couple gable / crown and their respective shapes and centering.

The average tension adjustment of the belt is secondary for this problem, it plays, but not a lot (to tighten the belt aggravates this resonance problem a little too), while the difference between 2 different belts therefore plays a lot on the phenomenon.

I was able to have a belt to go and an another belt on the return, so the comparison was easy: the set of belt noises is very different from one to the other at different speeds / acceleration / decelerations => It is obvious, it is not embarrassing apart so this big resonance and 1st acceleration in the maximum, rolling it then does not come, except at the start of the climb so, so it comes back to a strong couple required.

There will be other handles by the dealership to try to resolve this resonance with the new belt. I will post at that time.

4
Zero Motorcycles Forum | 2013+ / Re: My thoughts on my new DSRX 2024
« on: March 05, 2025, 07:39:38 PM »
Quote from: KuRi on March 04, 2025, 12:25:33 AM
- Today while trying to charge I got an "Isolation Fault" and was unable to charge (no water, just maybe some humidity on the garage). I got some errors on the dashboard and was only able to charge after 5-6 hours waiting. Then the errors dissapear and after a full charge I was able to ride again.
Almost new buyers of Zero got this "Isolation Fault".
I got BMS logs with dealer.
Conclusion : it's a software bug, because faut is with higher Mohms value as fault clear.
In my case, 2000km with Zero S and 3 monthes, already "3 isolation fault".

4702238 ohms => Fault set ... 3354997 ohms => Fault clear
5008448 ohms => Fault set ... 2548091 ohms => Fault clear (this time with also "Battery Ineligible" set)
2846579 ohms => Fault set ... 2033755 ohms => Fault clear

Embedded software engineer should check one line in their C code with one inversion of > and < ...

5
Zero Motorcycles Forum | 2013+ / Re: Strong strange noise in acceleration following belt change
« on: March 05, 2025, 05:54:29 PM »
Quote from: TheRan on March 05, 2025, 05:45:30 PM
It almost sounds like something else nearby is resonating, perhaps a bit of bodywork or the rear mudguard. Have a check over the bolts and screws to make sure nothing's loose. If it's not that you might just have to accept it. From my experience trying to get rid of belt noise on my DS I've come to the conclusion that it's just something that happens when you have belt drive on an otherwise quiet bike. With the perfect combination of tension and alignment you can sometimes get it fairly quiet, until it gets wet or dirty or something shifts slightly.
Thanks, but I' can't accept this kind of bad resonating noise, the motorcycle is almost brand new (3 monthes) and was OK before the belt change.
I'll try to mount the first belt (just a little scratch on it) to proove it's a default on the new belt with a bad resonance of the belt itself.

6
Zero Motorcycles Forum | 2013+ / Re: Several noisy resonance/vibration points when accelerating
« on: March 05, 2025, 01:50:03 PM »
So happy to find this topic !

Here is my new topic on exactly the same subject : https://www.electricmotorcycleforum.com/boards/index.php?topic=13432.0

Here is the bad sound captured in video, is it the same ?


7
Zero Motorcycles Forum | 2013+ / Strong strange noise in acceleration following belt change
« on: March 05, 2025, 01:33:09 PM »
Hello everyone,

On my Zero S 2025, just following the change of the belt, a new strong strange noise appeared during acceleration, you can heard the sound on the video on 3 different accelerations.

It occurs only by accelerating with the max handle from the stop or from a low speed, otherwise it does not appear during the acceleration phases while driving. It is even more blatant in a climb, so when a strong couple is necessary.

I just went to the dealership to check the tension of the belt which was able to Freq at 62Hz, they tightened it to have at 68hz.

But the noise is still there.

With the old belt, I have a multitude of sound recordings taken in the same place just above the engine with my Bluetooth microphone, and there has never been this kind of noise type during acceleration.

The new belt seems well centered.

If someone has already had this problem or has an idea of ??the cause. Should we still tighten the belt ? The specification indicates between 62Hz and 82Hz.

We can heard that the noise can start at 15km/h to stop at 45km/h and resume 45 then up to 50, or start at 45 to stop at 75.

There is a resonance of the belt, it seems almost sure, but why?


8
Zero Motorcycles Forum | 2013+ / Re: Video with action cam installed on the front mudguard of the Zero S
« on: March 02, 2025, 01:50:06 PM »
New try with a ND64+CPL filter and modified colors :


9
Zero Motorcycles Forum | 2013+ / Re: Video with action cam installed on the front mudguard of the Zero S
« on: February 26, 2025, 10:08:54 PM »
Quote from: Specter on February 26, 2025, 02:35:27 AM
How does the bike behave on those runs.  Do you have overheating problems at all?
ive seen zero at the track a few times and they always told me they really can't run them because it overheats in a lap or two.
These were older bikes, am wondering if they got that worked out or  not.
Aaron
Hi ! Never had overheating ... after at least 10 laps like these.

10
Zero Motorcycles Forum | 2013+ / Re: Video with action cam installed on the front mudguard of the Zero S
« on: February 26, 2025, 02:26:05 AM »
New try with another road :



11
Zero Motorcycles Forum | 2013+ / Video with action cam installed on the front mudguard of the Zero S
« on: February 23, 2025, 01:58:20 AM »
Hi everybdy !
Here is a video with action cam installed on the front mudguard of the Zero S, microphone is placed under the saddle to avoid the sound of the wind.
Action cam is in a sub-marine box to protect from many flies.
Sound has also been filtred to kill the noise.

Really better in 4K 10bits (less bad noise) :


Next step : adding ND filter for nice motion blur.

12
Zero Motorcycles Forum | 2013+ / OBD-II with Gen3 2024/2025 access to logs impossible ?
« on: February 23, 2025, 01:36:25 AM »
Hi everybdy !

I'm trying to access MBB logs with an OBD-II link with Gen3 (Zero S 2024/2025).
But it always answer : "log printing not supported".
All others cmd of help are working well.
Do someone know how to do ?

with help cmd :
Quote
-- MBB Event Log Management --
  elddh           - Log Dump by Date dump hex.  Usage: elddh [start date: MM DD YYYY HH MM SS]
  eldh             - Display event log contents in hex for export to .hex (need log decoder to decode)

My tests :

ZERO MBB> elddh
Quote
Enter an end time (MM DD YYYY HH MIN SEC)
02 16 2025 00 00 00 (entered)
log printing not supported

ZERO MBB> elddh 02 16 2025 00 00 00 > 02 17 2025 00 00 00
Quote
log printing not supported

ZERO MBB> eldh
Quote
******************************************************************
Current MBB time is Mon, 02/17/2025 09:46:21
VIN: PAG...,                     Serial: R...,  Model: S_A1,   MY: 2025
Board Name: MBB PDU POTTED GEN 3 STEP D1,     Board PN : 40...,     Board ID  : 05
Firmware Name : FIRMWARE MBB GEN3     , Firmware PN : 75..., Firmware Rev :37 
Build : 2024-05-28_... banka, Reset Source: Hib Wake Pin, Power-On, Supply WD, Power Val
******************************************************************
log printing not supported


Moreover, I don't arrive to access the BMS prompt : "ZERO BMS>"
I'd like to launch the "ZERO BMS> balance"

I've tried (bms login <bms> <level>) :
ZERO MBB> bms login 2 1
Quote
Logged in to BMS 2 at level none
Success

I choose <bms>=2 because "ZERO MBB> status" answers :
Quote
* * * BATTERY INFO * * *
 BMS | SOC |  Pack V  | Current | Capacity|  L cell  | H temp | L temp | Cont | Elig
 ----+-----+----------+---------+---------+----------+--------+--------+------+------+
   2   78 %  111405 mV  0 mA     137 AH    3976 mV    14 C    13 C      +     + +

What is level ? Do someone know how to access the prompt  "ZERO BMS>" ?

Thanks in advance !

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