have you used VESC?
i wasnt able to find a seller of those so i could try it out.

Hey jrbe, that's quite a sketch you made there. i understood it partially, im not that good of a designer, and here on the island the machineshops couldnt fabricate something like that.

the easiest way would be indeed to use the "dead pump" , ive attached a drone esc to it, it did spin and create ...

i m trying to do something similar, but still using the original oil pump head

Turns out My oil pump is "dead".
the main reason those pumps die seems (to me) to be water getting in the brushless motor of the pump, which then kills the resolver board. without a resolver the controller will not turn the pump. that s why i could make the brushless motor spin with a sensorless ESC ...

i ordered this pump
Screenshot 2025-05-29 at 6.44.06 PM.png

i opened, it seems to be a brushed dc motor, runs smooth.
IMG_7510.JPG
IMG_7511.JPG

on the bottom side, there s a + mark
IMG_7512.JPG

when connected to 12.7volts, it pulled around 3-4 Amps.

its has a bigger and a smaller hole ...

after quite some days of driving around, same oil pump problem came back.
driving...after while the pump turns of. i've been running it with a separate PWM generator, 1kHz, 16%duty

i started to think its the oil pump controller.
i ve been building drones for almost 10 years now, so i have some ESC ...

quick run i did a while ago, potnom vs speed
never went above 6k rpm
negative rpm MG2 is forward on my setup

Gregski wrote: ↑Fri May 16, 2025 7:47 pm possibly have you logged your torque yet? when I did that on my VW Rabbit with the 3rd Gen Prius Inverter you can clearly see it pegs out at 3500 and wont go above that setting

im going to log torque now

changed the code to 12500, both lines.
went for a test drive, 124Amps at 340 volts

New code will be then:

758 htm_data[81]=(12500)&0xFF; // discharge ability of battery
759 htm_data[82]=((12500)>>8);

freshly downloaded

throttle wasnt fully pressed (user error, to focus on the logging and the end off the road ahead)

throttle to the bottom!

after 1 plot, the vcu will not start another plot

im at 350volts now, should i charge first?

My pack is made of samsung sdi cells, 67Ah, 3C peak
96 cells
That would be 67 x 3 = 201A
Fully charged, isa shunt max Amp report is around 120-129A, throttle all the way down

It feels more like a torque request limit

I thought so too, is it some limitation in the gs300h code?
I havent got the time to do some testing
I m thinking of plotting mg2 speed, torque and idc.

thanks tom,
i'll see if i can find a matching spline to lock the input shaft, as i can't find the original clutch plate

my batteries can output max 200A, i can never reach more than 129A. even on full throttle
im limited to 70-80kmh, downhill i might reach 90-100kmh.
i read Zechy's thread, BMW Z3, but couldnt find the fix. Jamie sent him a bin and his 110A-120A max issue was fixed.

im only using mg2, input shaft is ...

2) Inadequate oil fill causing pump cavitation. Pump runs too fast cavitating and heats up. Again, this only becomes apparent after a stop as the internal pump keeps things going. When you wait a while, enough fluid drains back to the pump to allow it to start pumping again, enough to allow the ...

Gotcha!
For monitoring i have a 5inch nextion display with an ESP32 reading from the canbus and displaying on the nextion display.

I wrote a basic arduino code like :
If canbus available check for the id
If id is (for example) 0x1Dsend the value to the serial bus which is connected to the nextion ...

Fully on solar!! Nice
Here on the island i charge at home, max 3kW
I try to charge at the free stations when possible.

With the charging sorted out, what else you missing?

running 4 bms board for almost a week straight, so far no issue.
been balancing away. cell voltages are spot on!!

BOARD 1
BMS-1.png

BOARD 2
BMS-2.png
board 2 was the first board to get a muxshort error a while ago, i didnt know better back then, i just left the board unpowered, but connected ...

understood!
you can get up to 6kW charging power with 2 modules, so its not that bad.
how big is your battery pack?
mine is 24kWh, i got 115-118km on a charge. i want more, im trying to teardown a model 3 battery to take 30-50kWh from it

yeah, now that i see the picture, some pads are messed up.
are you able to trace where those pads should be connected? then you could solder a wire from the directly to another more accessible location.