Tesla rear end swap Options

[siverson]

I think this has been done in VW buses, sand rails, and a Cobra - could be neat in a 914. And it would likely be a massive improvement over the rear suspension geometry as well.

Rear Track of a Model S is 67", Factory 914 is 55" - nothing some wide flares can't accommodate.

-Steve

[Jeff Hail]

I am technician class certified on Tesla vehicles.

A lot of electronics needed to make this work. You will first need to come up with a 12 volt low voltage system. You will need to have both DC and AC sides for the 12 volt trunk. You will then need to come up with a 400 volt (high) system that is isolated from the 12 volt branch entirely. The 400 volt side will need to have an inverter which you have on the right side of the differential for the AC motor which requires 386 volts. Then the battery storage comes into play with enough to supply consistent 100 amps. Then the small stuff like the drive by wire to modulate the amperage to throttle the drive motor.

I think this is a great idea and with a minimalist approach could be done but it would take a lot of work and engineering ingenuity. Battery storage size can be reduced significantly with all the deletes of the bells and whistles that are not needed that would normally fall under a complete T vehicle. Based on what I know the 100 amp requirement should be able to be brought down to 50 amps and still work for 2wd.

On the flip side a small gas powered engine say a V Twin 22 HP (700 cc) industrial motor driving a generator could be used which we still weight less than a battery bank. I would look at turbine powered APU's from jet aircraft. They are pretty compact such as a The Tiernay TT10. 24 volts and 300 amps!!! The sound would be wicked.

[burton73]

I am technician class certified on Tesla vehicles.

A lot of electronics needed to make this work. You will first need to come up with a 12 volt low voltage system. You will need to have both DC and AC sides for the 12 volt trunk. You will then need to come up with a 400 volt (high) system that is isolated from the 12 volt branch entirely. The 400 volt side will need to have an inverter which you have on the right side of the differential for the AC motor which requires 386 volts. Then the battery storage comes into play with enough to supply consistent 100 amps. Then the small stuff like the drive by wire to modulate the amperage to throttle the drive motor.

I think this is a great idea and with a minimalist approach could be done but it would take a lot of work and engineering ingenuity. Battery storage size can be reduced significantly with all the deletes of the bells and whistles that are not needed that would normally fall under a complete T vehicle. Based on what I know the 100 amp requirement should be able to be brought down to 50 amps and still work for 2wd.

On the flip side a small gas powered engine say a V Twin 22 HP (700 cc) industrial motor driving a generator could be used which we still weight less than a battery bank. I would look at turbine powered APU's from jet aircraft. They are pretty compact such as a The Tiernay TT10. 24 volts and 300 amps!!! The sound would be wicked.

You say the small Eng. could put out 300 amps. Even my Lexus RX400H hybrid has massive torque with it Prius like drive in it. Punch it and it lays rubber in the front tires and pulls and pulls.
So if you had no batteries would this still work?
If you run a Prius almost out of gas it goes into a super slow crawl to try to find a gas station. Tesla only with battery tells you to get power. Mable something in-between

Bob B