Ebike speed decreased after an incident? maybe?

[Muramura]

Hi People of the sphere -

I'm new and would love some help to get some diagnoses of my custom ebike. Well I recently just bought this custom ebike that is rated at 1000w but he said could do around 1,500 watts before too much voltage sag from the pack (with horrible milage of course) . As of now im running it at 750ish and it used to get me up to 23mpg just on juice.... but as winter and black ice set in I met a familiar foe...at 38degrees really .. a icy fall into the cement at 22mph, that was fun said my ruined cheeks and limbs (Just a flesh wound, burns only).

Although the ebike seemed fine with alittle bit of plastic damage and some pulled plugs. Now it can barely pull 20mpg even at 750w, if i up the voltage to 900w the acceleration seems the same at 500w....it havent gone up in speed at all anymore....alittle worried... I would like some insight, im a noob when it comes too ebikes but im really willing to hear people out and understand this world a little more.

Ebike Specs:
DHUB: Crystalyte HS3540
Bat: B4810_LiM_EZ
Control: 12 FET 40amp infineon?
Cycle Analyst V2.5

Thanks for reading hope this was good enough info, tell me if you need anymore details.

Zen

P.s id like some insight on some good priceless upgrades to make it a smoother faster ride if you have any mods or tips of products. thanks.

 

[dogman dan]

While it's possible something got damaged,, you may just be noticing the weather more than you did initially. Your battery performance will drop dramatically in the cold weather.

Don't know where you are, but a lot of this winter was pretty mild, till more recently. It could be just that simple. The first few years I rode e bikes, every year I would think I had a big problem,, then I'd realize and kind of give myself the dope slap. Oh yeah,, its cold now.

See if starting out with a warm battery, like really warm room temp helps. If you have your speed till the cold gets to the pack, it's only the cold.

Also,, do look at all your plugs, the wires. You could also have a loose connection that developed from either the cold, or the incident.

 

[alfantastic]

Check that the braking system hasn't taken a knock. Don't know what type of brakes you are running, but make sure both wheels spin freely, without the pads binding on either the wheel rim or brake disc.

 

[fechter]

Another thing to check is if your controller has a 3 speed switch. If the wiring or connector were damaged, it could default to speed 1 or 2 settings.

 

[Muramura]

Thanks,

I appreciate the suggestions I dont think cold weather is effecting it, that much i had it in my work place before i left (72f) but you never know it is sub 30F mostly outside....
Thanks dogman dan

Brakes might be rubbing slightly but i dont think thats the problem....Thanks alfantastic

As for the wiring in the controller i have no clue how to look at the circuitry and would like to get some guidance on that. just hoping this isnt the problem lol
Thanks fechter

Well I updated my spec sheet as I found out more info this morning.

Thanks

Zen

 

[fechter]

Look carefully at the wiring, especially where the wires come out of the motor and any plugs between the motor and controller. Look for signs of damage. Try unplugging and reconnecting the connectors. Check the connector pins when they are apart. Make sure all the pins are sticking out the same distance.

 

[markz]

Wear a helmet!

 

[Blue Ice Bike]

Maybe your speedometer cable came dislodged or your wheel is bent.

 

[MadRhino]

.... and the most likely :

In a crash the handlebar hits the ground hard enough to damage a throttle, sometimes sticking it full throttle, sometimes limiting its range, sometimes just killing it. This is quite common with twist throttles. Test by jumping wires, replace for cheap.

 

[Muramura]

Look carefully at the wiring, especially where the wires come out of the motor and any plugs between the motor and controller. Look for signs of damage. Try unplugging and reconnecting the connectors. Check the connector pins when they are apart. Make sure all the pins are sticking out the same distance.

I have already but ill look closer thanks for the suggestion.

Wear a helmet!

Dont worry my regular activities of not wearing one on a bike are so over because I have a fricking motor on my back lol.

Maybe your speedometer cable came dislodged or your wheel is bent.

Idk ill look into my hub more it does wabble alittle....i hope its not the issue.....

.... and the most likely : In a crash the handlebar hits the ground hard enough to damage a throttle, sometimes sticking it full throttle, sometimes limiting its range, sometimes just killing it. This is quite common with twist throttles. Test by jumping wires, replace for cheap.

Yeah my handle bars did hit pretty hard so this could be a possibility also when im accelerating its not like full torque, it goes then decelerates alittle then goes smoothly....so Idk could be the throttle or the hub or wires lol

Thanks for the info

 

[dogman dan]

Now that you actually described the problem to us, we can say what it is.

You have a wiring problem. something somewhere, likely between the motor and the controller, but possibly on the throttle, is making intermittent connection.

Once I had a funny rub on a phase wire, the thick ones to the motor. The motor ran, but one wire was nearly cut, and could only deliver partial power. Took me forever to find that damaged wire. I looked and looked, but never in the right spot to see it. Till I found it, it ran smooth because it did get some power, but 1/3 of the power was gone. The easiest way to lose 1/3 power is to have a poor connection on the thin wires to the motor.


One rule of thumb with e bikes. If it's not the battery,, then it's the wiring 90% of the time.

 

[skeetab5780]

I would look into the cycle analyst as the culprit. Unplug it and see if your problem is solved, if so some buttons may have gotten pushed when bike dropped it could alter ride style easily.

 

[Muramura]

Now that you actually described the problem to us, we can say what it is.

You have a wiring problem. something somewhere, likely between the motor and the controller, but possibly on the throttle, is making intermittent connection.

Once I had a funny rub on a phase wire, the thick ones to the motor. The motor ran, but one wire was nearly cut, and could only deliver partial power. Took me forever to find that damaged wire. I looked and looked, but never in the right spot to see it. Till I found it, it ran smooth because it did get some power, but 1/3 of the power was gone. The easiest way to lose 1/3 power is to have a poor connection on the thin wires to the motor.


One rule of thumb with e bikes. If it's not the battery,, then it's the wiring 90% of the time.

Ill look into it for sure it would make sense that all that power was just not being fully connected. and some of the wiring was pulled so likely the cause but you never know.... Thanks for most predicting problem possibly.

I would look into the cycle analyst as the culprit. Unplug it and see if your problem is solved, if so some buttons may have gotten pushed when bike dropped it could alter ride style easily.

Yes when I did Crash the bracket was snapped and the cables seemed to have been pulled and that could have been the problem as well but ill look into it, Thanks for the suggestion.


Ill try my best to find the culprit of the problem but it may take sometime but I appreciate your thoughts and everyone elses. Ill have a follow up on my
findings soon.

Thanks Zen