Tesla Model 3 Rear Drive Unit Hacking

[Jack Bauer]

Ok I'm an idiot. Just had to set il gains and ocur lim to negative and we have full closed loop control:)

Muhahahah.....hahah......waahhhhahahahahah

[JaniK]

Good work and great news!

What happened with the oil choice?
Is there a good choice or just random choice?

[Jack Bauer]

I have a gallon of Dexron 6 waiting.

[Jack Bauer]

At this time I have decided to do a full opensource release of all design sources:)
More updates and video to following including testing in a M3 front DU.
https://github.com/damienmaguire/Tesla- ... Drive-Unit

Rear drive unit now responding to throttle commands in both directions with regen.
To Do :
Secure mod wires.
Button up the inverter
360v full test.
Make install video showing every step (super boring) in a front DU
Run front DU
Retire to Lanzarote on the profits.

[Isaac96]

Great!
Front DU is induction IIRC, does that make for easier tuning and probably easier integration into vehicles?

[Jack Bauer]

[JaniK]

Does it matter what type of wiring to use between modboard and M3 inverter PCB ?

Min/max. gauge? Insulation thickness?

Or do we just us some leftovers from a computer power supply etc.

[Jack Bauer]

I'm using kynar wire most commonly used for wire wrap boards. E.g. :
https://www.digikey.com/catalog/en/part ... eries/1966

I'll go through all this in the forthcoming installation video.

[mdrobnak]

The motorsports industry generally uses wire with ETFE (Teflon) / Tefzel wiring. It allows the jacket to be thinner, saving weight. Also highly resistant to things like fuel, etc. Apparently also used in spacecraft - https://en.wikipedia.org/wiki/ETFE

-Matt

[JaniK]

Thank you both for replies

I found full rolls of kynar wire and thats a bit much.
Maybe I didn't look too hard.

For ETFE I found this item that ships per foot...:
https://www.mouser.fi/ProductDetail/TE- ... YKmg%3D%3D

+200°C max temp and 600V rating, seems ok to me?

Unless a Damien board ships with a string of wire..

Thoughts?

[Jack Bauer]

I may decide to offer a kit with wire. Will see what happens once sales start.
Finding the last few signals today before hv testing.

[EV_Builder]

Damien wouldn't it be nicer to un-solder the IC and solder a board with connector to the board?
Or maybe just a legged board with connector? long enough that you can solder the pin to the old IC pad?

Did you consider this? or do we need every other pin pulled-up anyway?

[Jack Bauer]

Yes I did indeed think of that at the outset. There were problems with that approach however. That said I am working on a neater solution:)

[Jack Bauer]

Oil pump controller used in both front and rear drive units is an Onsemi LV8907.
https://www.onsemi.com/products/power-m ... Session=-1

[Jack Bauer]

Scratched an itch and tried Jtaging the Musk brain. Imagine my surprise when it didn't work. Oh well, better give up and go home ....
Attached pinout (as best as I could make anyway) of the 10 pin Jtag port.

[Jack Bauer]

Well, the old horse for the long road i suppose. Started a spreadsheet for the pin map on the main MCU :
https://github.com/damienmaguire/Tesla- ... PinMap.ods

[JaniK]

For the new idea and neater solution, even though its a "secret" surprise.

Does it require better tools to install compared to modboard..?

[Jack Bauer]

With luck it will be quite easy. I know I'm not updating much on here but it is happening at a good pace.

[JaniK]

I am putting the motor in my summer car and it is just starting to snow, building car in cold garage, so no rush, wpuld propably go install motor in coldest winter months anyways for snow testing the car If its done

[jon volk]

With luck it will be quite easy. I know I'm not updating much on here but it is happening at a good pace.

Well, things usually progress quicker without questions and “you’re doing it wrongs”

[Jack Bauer]

Yep its moving along well now. I'd say another week and I'll have an announcement:)

[JaniK]

Now i am connecting the clues thumbs up!

[johu]

Hmm, relaying the signals to an openinverter processor via SPI?
I promise I haven't spoken to Mr. Bauer

[EV_Builder]

Yes I did indeed think of that at the outset. There were problems with that approach however. That said I am working on a neater solution:)

Can you tell me those problems?

[Jack Bauer]

I hope to have a video out in the next week that will answer all. Still neck deep in it:)