4wd BMS i3?

[anonymous-user]

So, my ideal next car, take two i3s and Frankenstein them together, into a >300bhp 4wd one......

Anyone know:

1) how much would you expect to pay for a salvaged i3??
2) what the front suspension is (any chance of finding some drive-through hubs/uprights that would bolt up?, ie from a Mini or similar??)
3) Is the inverter packaged in with the traction motor
4) what the architecture of the battery pack is (voltage & series / parallel cell allocation?)

[anonymous-user]

DOH, typed "BMS" in title and not "BMW"........

(blame all afternoon talking about Battery Management Systems...........!!)

[PhillipM]

I just assumed you were going to build a swish BMS for it

[AER]

Looks doable, but have you finished with the SEAT yet?





I think in the scheme of things, it would be easy enough to design and manufacture some revised hub carriers to take driveshafts.

[anonymous-user]

Looks like the front struts would have to be changed for shorter ones as they have sunk the lower end of the damper cartridge down below the axle centre line of the upright, but that wouldn't be too hard. The steering rack looks like more of a problem, and looks like it would be in the way of a front motor install though.......

[227bhp]

Copart is one of the biggest auctioneers of salvage.

[Luther Blisset]

Max_Torque said:

they have sunk the lower end of the damper cartridge down below the axle centre line of the upright,

Why would they do that exactly?

[anonymous-user]

Luther Blisset said:

Max_Torque said:

they have sunk the lower end of the damper cartridge down below the axle centre line of the upright,

Why would they do that exactly?

To be able to package a nice long travel strut in a low overall package! You want a long strut for any given travel because the greater "Overlap" means greater stiffness (bending) which is critical for a strut, where it carried large bending loads under lateral and longitudinal wheel loads. With a non-drive through upright it's easy, you just drop the strut down through the clamp, but with drive through you'll have a CV/Shaft in the way, which makes it tricky (at the front where you need to control your vertical steering axis. (at the back, you can just offset the strut longitudinally to miss he shaft, for example, see the rear suspension of a scooby etc)

[anonymous-user]

Looking at it, when no REX is installed,there is space for another motor in the back:





But i fancy 4wd and the ability to do electronic torque sharing........

Edited by anonymous-user on Friday 15th July 15:41

[Luther Blisset]

I was hoping for a much more "black magic" type explanation of the strut length

[AER]

It's not beyond your ability to design a new multi-link front suspension package to go with the new motor and steering geometry, Max...?

[anonymous-user]

AER said:

It's not beyond your ability to design a new multi-link front suspension package to go with the new motor and steering geometry, Max...?

no it isn't, but my record on finishing things isn't brilliant..... ;-)

Struck me that one could turn a second motor / trans assy upside down, lock the diffs on both, and run with two motors across the back, with electronic cross axle torque control, which would be easy to do! Use a gateway module between the vehicle and the two inverters to do torque sharing and cross axle cornering speed control, so it still thinks it's just talking to just one inverter.

[Ive]

BMW had a innovation web portal in the past. Don't know if it still exists. Drop them an email. :-) You need an i3x-drive.
Maybe they build one. They "just" need to cram the i8 drivetrain into the i3 and call it i3m x-drive ;-)

I have seen an electric X5 prototype some 10-12 yrs ago while visiting BMW R&D. Was funny, because I spotted a X5 in a corner with a charging cable exiting from the slightly lifted engine lid. They confirmed it was an electric X5. They then told us some torque and power figures. I forgot them, but it had a huge torque figure.
Next to was a picture with it doing 4-wheel drive burnouts in a circle with thick smoke coming from the wheels front and rear.
Sometimes they actually build such things to explore how they "feel" to drive in the real world.

[chuntington101]

Ive said:

BMW had a innovation web portal in the past. Don't know if it still exists. Drop them an email. :-) You need an i3x-drive.
Maybe they build one. They "just" need to cram the i8 drivetrain into the i3 and call it i3m x-drive ;-)

I have seen an electric X5 prototype some 10-12 yrs ago while visiting BMW R&D. Was funny, because I spotted a X5 in a corner with a charging cable exiting from the slightly lifted engine lid. They confirmed it was an electric X5. They then told us some torque and power figures. I forgot them, but it had a huge torque figure.
Next to was a picture with it doing 4-wheel drive burnouts in a circle with thick smoke coming from the wheels front and rear.
Sometimes they actually build such things to explore how they "feel" to drive in the real world.

Funny you should mention the i8. I hear max already am as a decent petrol engine hat barely ever gets used. Could maybe incorporate it I the the i3 or the i3 motor into the 'other' car!

Come on max, you know you want 'torque fill' like the P1 has!