Hello Everyone, I would like to share what I am planning for my project and would like some feedback from you based on your vast knowledge and experince in the subject 
I am planning to convert a BMW 'e30' 316i touring to EV using the Motor/Inverter from a Nissan Leaf.
The e30: it was choosen as it is a classic that in smaller motors like this is still affordable. It is a strong and well built car with a big community of DIY in internet, so lots of information on how to fix it later. It also offers a good relation of weight vs space to work. I have some options already found and believe this could work just fine.
The 'Nissan Leaf' motor/Inverter: I think it has a good cost and more than enough power for what I need and many options of controler board in the market (I was considering buying one from open inverter here in Germany). I was considering a small unit from Tesla but as it comes integrated to the diff, I would need to cut the spare wheel well to assembly it under the rear floor and I don't know how the TÜV here would see that. If I can make it work work simpler with the leaf, why not?
Battery: I will leave this to the end, when everything is ready I will check what is affordable and Buy. I want to start with a small pack just to homologate and see how reliable and pratical it goes and expand it later.
NO Gearbox: Here is my biggest doubt. I would like to go without tranmission. I would like to link the motor to the diff just modifing the existing shaft. If possible at the fuel tank area, if not at the original transmition spot. The diff would be a 4.4 ratio from the e30 316 AT. The problem is that is much longer than the 8 ratio from the leaf. The e30 is lighter than the leaf and has smaller wheels but would that be enough to make it work? (work for me means: don't destroy itself and 0-100 around 10s).
Does anyone know any project that used similar configuration?
One other open concern that I have is the 'TÜV' approval here in Germany. Is there anyone here that knows more details that could help me. I don't want to start spending money and run the risk of having a non road legal vehicle stuck in my garage later.
Thanks everyone for your attention and looking foward to hear from you soon.
I am planning to convert a BMW 'e30' 316i touring to EV using the Motor/Inverter from a Nissan Leaf.
The e30: it was choosen as it is a classic that in smaller motors like this is still affordable. It is a strong and well built car with a big community of DIY in internet, so lots of information on how to fix it later. It also offers a good relation of weight vs space to work. I have some options already found and believe this could work just fine.
The 'Nissan Leaf' motor/Inverter: I think it has a good cost and more than enough power for what I need and many options of controler board in the market (I was considering buying one from open inverter here in Germany). I was considering a small unit from Tesla but as it comes integrated to the diff, I would need to cut the spare wheel well to assembly it under the rear floor and I don't know how the TÜV here would see that. If I can make it work work simpler with the leaf, why not?
Battery: I will leave this to the end, when everything is ready I will check what is affordable and Buy. I want to start with a small pack just to homologate and see how reliable and pratical it goes and expand it later.
NO Gearbox: Here is my biggest doubt. I would like to go without tranmission. I would like to link the motor to the diff just modifing the existing shaft. If possible at the fuel tank area, if not at the original transmition spot. The diff would be a 4.4 ratio from the e30 316 AT. The problem is that is much longer than the 8 ratio from the leaf. The e30 is lighter than the leaf and has smaller wheels but would that be enough to make it work? (work for me means: don't destroy itself and 0-100 around 10s).
Does anyone know any project that used similar configuration?
One other open concern that I have is the 'TÜV' approval here in Germany. Is there anyone here that knows more details that could help me. I don't want to start spending money and run the risk of having a non road legal vehicle stuck in my garage later.
Thanks everyone for your attention and looking foward to hear from you soon.