First EFUN experiences in 2010

Why don´t you contact Aileen at Efun?

There is propably a switch where you can choose economy/speed, have you tried this?

Regards

Johnny

Gottfried,

we have replied all above mentioned questions to your guy by email. if you have more questions, pls contact us directly.our mailbox efun_ev [at] 188.com.

we hope you have found the speed limitor on EFUN-D now.The top speed should be around 90kmph subject to loading ,wind, terrain etc.

Thank you for choosing EFUN products and hope you enjoy riding of them!

Amoyee Chen

Where are you, Who did you buy through, what did you pay? Thanks!

How many thundersky 40ah cells does this scooter contain?
I was told 21, but I found only 19 in the second-hand one I bought!
But the charger is rated 77V!

Hi jumpjack,maybe you have bougth 19 cells of Li polymer or Li ion battery pack with 3.7V per cell.Its rate charging voltage seems matching to our D5000's 21 LFP cells.But its protected voltage of overdischarging is not good to our LVC system in the controller. So I suggest that 18 cells you bought are feasible to be uesd in our scooter.If you have any more questions.Please send email to me.

Amoyee Chen

I jump in the thread because I am experiencing a similar issue: I've just bought a Efun D-5Kw through italian reseller Tec-o (X-Spin TED).

The scooter is advertised as a 21 Cell type, however total voltage after charge is 67.5V and looking inside I see only 20 cells.
By the way, can you help me identifying the brand of the 50Ah cells pictured?

Sorry for not been clear, but I found those 40Ah cells already inside the scooter!
They are Thundersky LFP40Ah.

But clicking on your signature I found that it's ok, "B" version is supposed to mount 19 LFP 40Ah batteries!
http://www.efun-ev.com/pro-b.html

But the charger is a YMC60-12 rated 77V, so I don't understand.
Maybe it has been changed by previous owner? But why?!?

As a comparison my charger for 20 cells is rated @ 72.6V

Dear jumpjack,if your 19 cells were true LiFePo4 like Efun B or C version,that's right.LFP 19\20\21cells are fit for our 52V(LVC) controller.But the charger must be rated 69V.77V was too high to be easily over-charged without BMS.Where did your YMC60-12 charger come from?It might be used to the old 21 cells version,right?

Dear Andrea Pirovano,Mr.Luca Basilico had ordered an Efun D-5Kw with 40Ah*20cells (just like Move2e's scooter) for you,please check it.

Amoyee Chen

Dear Andrea Pirovano,Mr.Luca Basilico had ordered an Efun D-5Kw with 40Ah*20cells (just like Move2e's scooter) for you,please check it.
Amoyee Chen

Amoyee,
actually my scooter was supposed to have 21 * 50Ah cells, is it possible to check what has been used? Do you need the VIN of the veichle?
Thanks for your help

Amoyee, thanks for the reply.
According to my information there were 2 "D" model scooters in this shipment. Were both of them with 20 cells and 40 Ah? This is strange because mine was supposed to have 21 cells and 50Ah....

I also tried researching info about the cells, but I found that 40Ah,50Ah and 60Ah have the same dimensions:
http://chinazhongyu.en.alibaba.com/product/613957241-213952365/3_2V_40AH_life_po4_battery.html
http://chinazhongyu.en.alibaba.com/product/599132028-213952365/50AH_LIFEPO4_BATTEY_CELL_for_EV.html
http://chinazhongyu.en.alibaba.com/product/560238547-213166996/3_2V60AH_LIFEPO4_BATTEY_CELL.html

How to tell which model is being used?

ps Not sure if previous message went through (moderation issues?)

Where did your YMC60-12 charger come from?It might be used to the old 21 cells version,right?

It came with the second-hand scooter, don't know its origin.

Thanks to the precious help from Amoyee we figured out that the two scooters ordered (one 40Ah and one 50Ah), being both white were mistakenly exchanged, so I received the 40Ah instead of the 50Ah.

Since all the property papers have already been made the importer will get the right batteries for me.

A couple of questions to Amoyee:
1- how many cells are used in the 50Ah version? 20 or 21?
2- If 21 also the BMS will have to be changed?

If you will only exchange 40Ah for 50Ah battery pack,you had best use 20 cells.Because another electronic parts are remained for 20cells version,such as BMS,charger,battery box,voltage meter.....etc,not matching to 21 cells.

If you will only exchange 40Ah for 50Ah battery pack,you had best use 20 cells.Because another electronic parts are remained for 20cells version in your scooter,such as BMS,charger,battery box,voltage meter.....etc,not matching to 21 cells.

I am aware that a lot of things are set for 20 cells , but i wanted to know if the stock 50 Ah bike uses 20,21 cells or there is not a rule about that.

There's not a staid rule for clients'liking.But our BMS supplier suggest that dual numbers of cells are better to compatibility ,such as 16,20,24,28....etc.So 20cells in a pack is a good choice.

Again thanks for your reply.
In the specific case (X-Spin) do you use 20 or 21 cells for the 50Ah bike?

Yes,there are also 20 cells in the 50Ah X-Spin scooters.

After some driving (still with the wrong cells) I experienced some slipping especially on the rear tire (on a rotatory and while braking more than usual at moderate speed), so I'm wondering if it is a matter of the tire type or maybe of tire pressure, since the seller told me that he inflated the tires a little more than stock.

What is the optimal pressure of the tires?
Did anyone experience similar issues?

What is the optimal pressure of the tires?
Did anyone experience similar issues?

My original "Cheng Shin" slipped very easily on whet roads. On dry roads they were a hoot, but as soon as it got wet it was almost like riding on snow with good winter tires...
I now ride German Heidenau K62 all-weather tires, and they grip any immaginable road surface save iced-over or sandy ones with ease. I pump them up to 3 bar / 44 PSI for a good compromise of low rolling resistance, good road holding and still of tad of comfort while riding on rough roads.

Now both Efun & Erider use the Tailand Vee Rubber Brand tyre which are more soft and better catch ground ability than Chenxing tyre !

See EEC of Tailand tyre

At the end the pressure was way too high, 3bar forwaard, 3.5bar rear.
Lowering to 2 and 2.5bar I feel more grip.

by the way, did anyone try to smooth/linearize the throttle response? It feels like more than half of the throttle rotation is doing very little; out of roughly 70° the first and last 20° are pretty useless...

by the way, did anyone try to smooth/linearize the throttle response? It feels like more than half of the throttle rotation is doing very little; out of roughly 70° the first and last 20° are pretty useless...

Maybe try a throttle grip with linear-programmed sensor output? My Wuxing HT288 has a linear output curve, and my Kelly turns that into a linear motor current output in Balanced Mode.
However, the unresponsive areas at both ends of throttle grip travel could also be dead zones programmed into the controller?

EDIT: Still this thread was not registered as "new" and put to the top of the recent posts list - maybe after this edit?

My efun also has a wuxing throttle.
I am aware that the final result is a combination of throtthle response vs degrees and controller response vs throttle input.
I am planning to plot the signal vs degrees to see if it is linear or not and then decide what's next

This is what mine does, both in H and L mode:

Very interesting,
so basically it looks like the H/L switch somehow limits the throttle signal...is 100% 5Volts ?

Where did you access the throttle signal? I would like to avoid taking the bike apart for this...