[WIP] BMW Z3

[Aragorn]

now my diff is on the way I'm really tempted to order a lsd for it in fact I'm on the Matt Lewis racing site with it in the basket right now trying to be sensible and really struggling because I really really want it

Are there not factory LSD options that can work instead of buying new?

[andybpowell]

Are there not factory LSD options that can work instead of buying new?

rare and expensive it's just as cheap to buy new also the ratio's are always high

[andybpowell]

since it was a little moist outside I treated the diff to a spin in the media blaster and a few coats of paint

just need to drop the old one and swap them over the slightly better ratio was hardly worth bothering with 3.45 to 3.38 but every little bit helps

[andybpowell]

Diff is in and it was an absolute pig the bolts were really hard to access and some idiot (me) put them in really tight with threadlock, but its all in just need to refill with oil and torque up the driveshaft bolts

[andybpowell]

[tom91]

Over 300A Can you get a Amp and UDC graph at some point? Things are starting to look good.

Wonder how much more the limit can go up by.

[andybpowell]

Over 300A Can you get a Amp and UDC graph at some point? Things are starting to look good.

Wonder how much more the limit can go up by.

yes no problem that plot was with throtmax at 50%

[andybpowell]

Over 300A Can you get a Amp and UDC graph at some point? Things are starting to look good.

Wonder how much more the limit can go up by.

Is this any good for you
Still juddering at low throttle not sure why yet

[Jacobsmess]

Peaking around 350A! Great work, did you tweak thrormax at all?

[tom91]

From those plots it is now hitting the 100kW limit as I set in the code. Will need to look at tweaking things more once your car is more sorted.

[Ev8]

Impressive, with my gearbox making noise this could be an option

[andybpowell]

From those plots it is now hitting the 100kW limit as I set in the code. Will need to look at tweaking things more once your car is more sorted.

hopefully I can have it usable quite quickly. I have the bms partially working it's reporting high and low cell voltages though it's not reporting the number of cells for some reason but I have done a major hack job on your simpbms code (sorry Tom) So I may start again with that as it's been through many changes, the charging is all working other than tidy the wiring and sort the rev light it'll be ready to go

[andybpowell]

Impressive, with my gearbox making noise this could be an option

only if you can find one, it seems the are all being bought up

[andybpowell]

Peaking around 350A! Great work, did you tweak thrormax at all?

no I think it's currently at 100%

[AMP3R]

Do you have a dragy? Could you floor it and show the numbers?

[tom91]

Do you have a dragy? Could you floor it and show the numbers?

No where near where any of that would be relevant yet.

[Ev8]

Looks like this won’t be an option for me as the longest ratio rx8 diff is 4.3! Lol will be interesting to see what top end you manage

[andybpowell]

I'm slowly chipping away at the outstanding jobs, charging is now working properly and it's currently on charge, the bms is working (90%) well enough so I can have some feedback during testing, and all of the important data is being shown on my nextion display so just the rev light and tidy the wiring

[nkiernan]

bms is working (90%)

I have a SimpBMS and just got a 24kWh X5 pack too. Are there many changes to the BMWPhevBMS to get it working with the X5 pack? Is it mainly around identifying the extra modules on the CAN bus?

[andybpowell]

I have a SimpBMS and just got a 24kWh X5 pack too. Are there many changes to the BMWPhevBMS to get it working with the X5 pack? Is it mainly around identifying the extra modules on the CAN bus?

I did have it all working when it was all laid out in my garage thanks to Tom De Bree, this is the information he sent me

In code

https://github.com/Tom-evnut/BMWPhevBMS ... hevBMS.ino

------------------------------------------------------------------------------------------------------

void sendcommand() //Send Can Command to get data from slaves
{
///////module id cycling/////////

if (nextmes == 6) {
------------------------------------------------------------------------------------------------------

6 is the modules amount, so change it to 12 as the modules are 0 to 11 .


But I'd hacked the code on my simpbms so much I decided to start again but now with it in the car I'm having some problems it seems to work fine when charging but when driving it seems to have some issues I need to investigate it further it may be down to all of the other canbus traffic on the same bus when in drive mode

[nkiernan]

Thanks for the reply, smaller change than I was expecting so! I hope to get to this on the bench at the weekend

[tom91]

Slight issue with this is that the final XOR for making the command correct for the numbers above 6 wont be correct, but if Andy has gotten the modules reporting the info this is all good.

It is possible that balancing will not work, this has not been proven yet.

[andybpowell]

I didn't look in depth at it to be honest it's reporting 96 cells and high and low voltages I'll have a closer look tomorrow if I get a chance

[andybpowell]

Slight issue with this is that the final XOR for making the command correct for the numbers above 6 wont be correct, but if Andy has gotten the modules reporting the info this is all good.

It is possible that balancing will not work, this has not been proven yet.

had a quick look from what i can see it looks fine no idea about balancing though

[andybpowell]

logged some more data as I was out driving the first 2 peaks are uphill the 2nd peak is a hill start

This is the matching video (I had to cut out a small bit due to my foul language)