Smart Roadster EV
 

Hi,
Some may still know me from my VW Polo 86C project. Have not written here for some time, but that should change now. I mothballed my Polo, sold most parts and got a Smart Roadster.

To the project:
Basis is above mentioned Smart Roadster BJ2006. The car is in good condition, no rust or similar.
Installed is a 0.7l turbo gasoline engine with 90hp in the rear. This was also the reason for choosing the vehicle: small, light, rear-wheel drive and affordable. With 810kg empty weight, the car is a flyweight for a Mercedes of this year.
Currently I drive the car with about 3.8l / 100km:
https://www.spritmonitor.de/de/detai...t/1040544.html

The goal, however, is to convert the car to electric drive. If one estimates the engine's energy efficiency and current consumption as the energy consumption later on, it comes to about 7-8kWh / 100km. The aerodynamics can still be improved MASSIV. A cw value of 0.3 should at least be achieved (currently 0.38). The front surface of just 1.54m² helps to achieve low air resistance.

I originally provided the components for the conversion for my Polo. Therefore, these are too big and too heavy for the Smart (Tesla S 220kW engine + BMW I3 90Ah battery). Currently I am trying to sell these. If this is successful, new components will be provided:
-Motor = EMRAX 228 or 268
Controller = in search
Gearbox = modified smart gearbox
Battery = LG CHEM 350V 17.6kWh 110kg

Will continue to report :)

Greeting,
Patrick

Nice! We didn't get the roadster on this side of the pond...I would have killed to get one! Saw one in person when I was in Rome...dang good looking car, and great gas mileage!

Worst gearbox in history, and an engine life of as little as 60k miles made them less than Smart.

Ideal candidate for an EV conversion though:thumbup:

The gearbox is slow but very Light and durable and the engine dies because of the driver... Eg He change only three of the six sparkplugs, or press the Pedal to the Metal with Cold oil... My engine has 145000km and works great.

But... Electric is better

The I3 Battery is sold and i buy a Smart ED4 Battery-Assamble.
120kg for all three Blocks (17,6kWh) without Housing. Little bit higher (175mm instead of 150mm from the BMW I3 Blocks) and with 430x355mm groundaera a little bit larger Modules. I hope i could squeeze them under the rear trunk, above the Engine.

"Fleck Elektromobile", a lokal EV Workshop, means the Roadster get +49kg empty Payload after his convertion. He use a heavy 60kg asynchronmotor with only 30kW and 10kWh LiFePO4 (wight about 110kg). So my Setup with ED4 Battery and Tesla should weight roughly the same and i had no problem with "overweight" :)

So, 132lb and 40hp? What range is projected for 10kWh?

ecomodder.com/forum/.../hot-rodding-toyota-mgr-29878.html

98lb and 68hp. I wouldn't get one though, I here the later RAV4 has twin motors and 80hp.

I remember this:

https://ecomodder.com/forum/member-j...w-backbox.jpeg

Was that 3D printed?

Yea, 3d printet. The tesla weight about 90kg for Motor, gearing and Controller. Good weight for up to 220kw

Long time since the last post.
A lot has happened, the setup has been changed and a second car has been purchased for the conversion phase.
In addition, there was new paint for the car, the first aerodynamic Verbersserungen have arrived and the very low consumption of approximately 3.4l / 100km gasoline shows that the 8kWh / 100km are realistic.

I buy new Cells with 260Wh/kg, so i could squeeze 22kWh in only 95kg inclusive Case, Mountingframe and BMW :turtle:
This weight advantage allows me to switch back to the Tesla engine. Will reduce the power to about 120kW ... but hey, the vehicle weighs only 850kg and I do not have to switch!

PS: i attached a picture to show how tiny this realy cool car is.

Is that an improvement?

I'd rather try some motorcycle engine conversion instead of going full-EV. Maybe not disconsider some hybrid setup.

On YouTube, Rich Rebuilds converted an old T-bucket hot rod to electric using the drive components of a wrecked Zero motorcycle. The motor is surprisingly small but the performance was pretty good nonetheless.

The Smart roadsters were even smaller, so keeping component sizes down is a win for this project.

i mean Aerodynamic improovments :P

And how i should use a heavy and complex hybrid with a lot of parts they could wear, when i could get a maintance free System with 300km+ and over 150kW on the Rearaxle? :P

The Zero Components are to weak and brittle for this job. I would drive 200000km+ without touch the drivesystem.

I was looking for confirmation.

Here's mine:

https://ecomodder.com/forum/member-f...mpare-size.jpg

(The one on the right. :)) A Toyota HSD part, 98lb/68hp. I have a donor vehicle but no current prospect of getting the two of them together.

I'm not really sold, because it's a single motor/open diff unit. Later models have twin motors and limited slip in software, with 80hp, so far as I know.

Hi,

the new Lithium Cells should arrive in a few days. The new ones has ober 255Wh/kg energy density and a continuous currect of 3C (peak 5C). So i could pump over 125kW peak out of this tiny 95kg Batterypack.

Many many changes in my project in the last months! Other cells, other Motor, other BMS and so on...
I dissamble the car actually and look where i can save up some kg.

Got pics?

Servus,

My previous job did not allow me to make any significant progress on my project. Since I have come more and more into the field "EV", I have now decided to make myself independent again. The project "Smart Roadster" is thus approached with new energy and buget. The goal is to participate in the "EcoGP" this summer and also to win!
Pictures of the stand will be available in the next 2 weeks. I am currently moving into a new factory building.

Very nice to hear! Good luck!

Way cool!