[WIP] BMW Z3

[Woodfie]

[quote=andybpowell post_id=69807 time= the extremely harsh power delivery makes it hard to drive safely and will tear out my bushes some of the updates in the Zombie pipeline should relieve or hopefully fix this issue so I'm doing the jobs I put off while evaluating the feasibility of the 300h which I think we can all agree has been decided as a yes it is.

[/quote]

[Woodfie]

Re the 300h usage, yes you have shown it has great performance promise.. Thanks for the drive you have put in, following a last years statement that seems someone needed to do it...
If you are able to measure any rpm to Amps drawn with wheels of the ground, would still be interested for comparison to the rig I currently have with L210 and Prius inverter , questionable matching.
I have acknowledgement from Damian that a Zombie board is on the way, but maybe a month or so for it to semi circumnavigate the globe..
Once connected up, down the time line, will also answer this efficiency/effectiveness assessment, but a measure of your Z3 would be helpful if possible.
Thanks. WF

[andybpowell]

Re the 300h usage, yes you have shown it has great performance promise.. Thanks for the drive you have put in, following a last years statement that seems someone needed to do it...
If you are able to measure any rpm to Amps drawn with wheels of the ground, would still be interested for comparison to the rig I currently have with L210 and Prius inverter , questionable matching.
I have acknowledgement from Damian that a Zombie board is on the way, but maybe a month or so for it to semi circumnavigate the globe..
Once connected up, down the time line, will also answer this efficiency/effectiveness assessment, but a measure of your Z3 would be helpful if possible.
Thanks. WF

I don't really want to do anymore road testing untill the next zombie update since retiring I have the time but I really don't have the free cash to replace bushes constantly it's also too risky in traffic with the twitchy throttle behaviour and we have nothing but traffic around here, stable rpm is difficult with no load but I,m sure I'll have something for you before the Zombie arrives

[Woodfie]

Yes, understood, no load and smoother control that I have is not easy, as we are torque requesting , your twitchy control, would be harder.
I wonder how difficult to progm to go temporarily to speed control, I.e. using rpm as feedback?
Like a marine set up could have. just thinking out loud.

[barracuda816]

I though from the beginning it should not be a problem whit top speed, despite those gear rations etc...
I mean , Lexus top speed wasn't 100-120 km/h.. It is much more with the same gearbox... Why should be now the problem..
ok , you need to change low ratio diff etc.. but that is not problem..

And I believe max power is approx the same as 450h, despite official rating.. Maybe is gh450 slightly more but nothing significant.
I think Is300 is better option then gs450. Smaller, lighter, single speed, no extra oil pump (no extra 12v power consumption), It has PARKING LOCK prop,
easier to run...

You are right about the Lexus top speed and the power, but irrc the Lexus has around a 2.7:1 final drive, also the motor is fed with 650v. When we want to run it at circa 400v and with a more common ratio of around the 3.6:1 both of those factors have a large effect on the motors top speed.

Also as far as I am aware the Mg1 isn't used as a drive motor, this also limits the top speed as mg1 when locked will be the top limit when mg2 has the potential to run faster.

[johu]

When we want to run it at circa 400v and with a more common ratio of around the 3.6:1 both of those factors have a large effect on the motors top speed.

Motor top speed is not limited by voltage. Peak power CAN be limited by voltage given it's not limited by inverter or motor anyway. Field weakening can take the motor far beyond base speed while almost maintaining peak power. Hence why it's pointless to come up with V/rpm figures or something.

[barracuda816]

Thanks Johan, I didn't know that.

[andybpowell]

Also as far as I am aware the Mg1 isn't used as a drive motor, this also limits the top speed as mg1 when locked will be the top limit when mg2 has the potential to run faster.

in a word no
with the input shaft locked the planetary carrier is fixed and the ratio between the gearbox output shaft and mg1 is 2.6 with a max mg2 speed of 14000 rpm the output shaft speed is approx 4200 rpm (14000/3.33) multiply that by 2.6 comes to just under 11000 rpm for mg1's max speed

[andybpowell]

While I'm waiting for the next software update I've been getting on with the jobs I've put off, today it was the rear battery box safety disconnect
I have already made an adapter to allow me to mount the KIA Niro disconnect flush as the fuse was higher than the mounting face

there wasn't enough clearance above the modules so I had to create a raised section in the box

And then retrim around the new section

It's not actually connected yet but that's an easy job for tomorrow

[Woodfie]

....

While I'm waiting for the next software update I've been getting on with ..........

Did you mention something about a software update in pipeline ?

Was discussing your savage throttle to a friend, at local ev mod and build group, and seemed that a rate of change factor or some other accelerator control massaging would help to 'soften' the response, and ease loading on your bushes.
If that is specifically what you need, I could ask if this could be done for you to try... I take it that v2.05a is what you are using ?

[andybpowell]

Did you mention something about a software update in pipeline ?

Was discussing your savage throttle to a friend, at local ev mod and build group, and seemed that a rate of change factor or some other accelerator control massaging would help to 'soften' the response, and ease loading on your bushes.
If that is specifically what you need, I could ask if this could be done for you to try... I take it that v2.05a is what you are using ?

Thanks for the offer but hopefully the new update will be soon and no offence but for the sake of a couple of days I don't really want to try any software mods from an unknown source the mods I've tried recently have been from known good sources (Tom de Bree and Jamie Jones)

[andybpowell]

new software possibly for the weekend so in the meantime I am going to start on installing Chademo other than hardware to actually fit the charging socket I think I have everything I need it's just weather dependent really as it always seems to be for most of us in the uk who have to work outside which is most of us

[andybpowell]

just been shopping to purchase the final few things I need to do my Chademo charge port I'm going to replace the lower grill with steel mesh where it will be fitted

if the weather doesn't get any worse I'll get the old plastic one out and get started this afternoon

[andybpowell]

Have made some progress with the Chademo install, I'm replacing the plastic lower front grill with steel mesh that will have a reinforced secton for the charging socket

It was awkward to make as it curves in both directions and being steel harder to work than an aluminium mesh also razor sharp

I welded some tags on for mounting but then the rain hit so plays over for the day

[andybpowell]

Well that was a waste of time, seems I got over excited and didn't look close enough the front battery box mount is in the way and I'm not changing that so I now have a mesh front lower grill that I didn't need. but it looks good

[Woodfie]

Edison version of that you have checked out and eliminated that option still stands..
I see the 2.15a version is released, hope that is the panacea for your mounts .
Also pleasing to see the 450h gear change enabled with a 7k to 2k rpm hysteris.