The blog for conversion of vintage BMW 3.0 CS coupes to Tesla powered electric vehicles
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You don't want the details? Just want to know where the project is at today? Here you go...
The EV conversion is finished. The car drives, brakes, steers, and accelerates perfectly (and fast). The bodywork is done. Now all that is left is a few electrical odds and ends, HVAC, and a complete restoration.
The BMS and charger are all configured and the car can be charged
I am driving the car, including driving it to its first car show
The coolant loops are both all connected and working
The batteries are all in the car
The J1772 charging plug is installed
High voltage cables and pyro fuse routed from trunk to Tesla drive unit
Rear battery rack finished (4 batteries) and onboard changer located in trunk, with coolant lines run to under car
Tesla electric A/C compressor mounted and A/C hoses fabricated and attached to compressor, dryer, condenser, and firewall bulkhead
All brake lines fabricated and power steering hoses fabricated and attached with original vintage reservoir
LED lighting added to battery box
Acrylic battery box skins trimmed in black mask and CSE logo applies to mimic original valve cover casting
Front battery box skinned in clear acrylic and test fit to the car
Mini Cooper electric power steering pump installed. Awaiting wiring and hoses.
Tesla electric AC Compressor mounted in tunnel where transmission used to be
Front battery box cooling lines run
Front battery box high voltage wiring completed
Tesla iBooster electric brake booster and Wilwood proportioning valve mounted
Radiators, A/C Condensor, fan, electric power steering pump, all mounted
A rust free shell on wheels with battery box
Trunk with battery racks (3 go behind the rear seat, 1 in the lower trunk). The Tesla drive unit is under that new trunk area
Tesla drive unit (motor, inverter, and differential) mounted with custom halfshafts connected, rear suspension installed, electric parking brake operational, new trunk fabricated
The car is driving. All the rust has been repaired. All the holes from US side marker lights, US pulled out bumpers, etc have been filled. Custom bumpers and rocker trim are done. The Tesla drive unit is mounted and the custom half shafts are attached. All the battery box/racks are fabricated, filled with batteries, and in the car. The custom shifter mechanism that converts the physical motion of the original BMW automatic shifter into electrical signals with detents has been built and mounted to the car. The hand operated parking brake is removed and has been replaced with an electric linear actuator that is be controlled by the custom shifter mechanism entering and leaving park. The drive-by-wire throttle pedal mount is finished and the brake pedal has been modified to work with a Tesla electric iBooster brake system. The electric power steering pump and A/C compressor are mounted and operational. The front battery box is skinned in clear acrylic.
I finished the battery wiring, made hydraulic hoses from the Mini Cooper electric power steering pump to the stock BMW ZF steering box. The brake lines have been fabricated and bled. The rear battery racks are finished and wired up. The pre-charge controller, contactors, fuses, brake switch, shifter, ignition switch, etc. is all wired up. I have driven the car. It charges. It's done. Well, it'll never be done but the EV stuff is basically finished.
Now I need to relocate the BMS, fit the HVAC system (A/C and heat), finish all the instrumentation, fix a lot of 12v bugs, and finish the rest of the 12v wiring. Then I'll tear it all apart and do the paint work.
Currently in progress:
Relocate BMS
Install battery lover
Test and debug all 12v wiring
On the immediate To-Do list:
Fix some gauge software bugs/features
Install under dash HVAC
More shake-down drives
Recently finished:
Finalize sunroof metal finishing
Pull in front bumper to 1972 (not US 1973) specs by making custom mounting brackets
Modify 3-piece front bumper with rubber trim and over-riders into a custom single piece all chrome unit with no over-riders
Finalize rear valence metal finishing
Fit rocker covers
Fix dents and other metal finishing
Fix rust in drivers door trim flange
Drive the car
Program BMS and verify charging
Install and connect BMS
Fit water pumps and plumb cooling
Bleed brakes and power steering
Wire up pre-charge controller, contactors, fuses, brake switch, shifter, ignition switch, etc.
Mount and wire up J1772, OBC and DC-DC
Finish rear battery racks
Cooling system bench and pressure test
Fabricate power steering hoses, A/C hoses, and brake lines
Front battery box skinned with extension box
Mounted Tesla electric A/C Compressor
Digital to analog fuel and temp gauges
Mount and hook up iBooster
Mount electric power steering pump
Mount radiators, fan, and A/C condensor
Front bumper rubber trim holes filled
Right front previous crash damage metal finished
Air inlet in core support filled
Charger and DC/DC Converter ordered
Electric parking brake mounted
Tach-hole dash app refined and working with BMS and on-board charger
As you probably know, I'm not converting just one BMW 3.0 CS coupe to Tesla power but two. One for me and one for my son-in-law, Alex. In fact, I'm involved in a third project for a customer as well. Brett Perkins at P3 Conversions is handling that build and I just consult a bit but I thought it would be interesting to compare how each project has tackled similar problems in different ways.
As I've mentioned before, my CSE project has taken a backseat to finishing the first CSE for my son-in-law. That car (I'll call it the Silver CSE from here on, versus my Blue CSE) was started by Paul Dexter and was the initial inspiration for my car. It was on the road as a full Tesla-powered EV, albeit in primer, for most of 2021. In late 2021 my son-in-law purchased the car from Paul with the promise of having me finish it. Sizzle Reel - click to view
It all sounds so easy. Just throw out that old gas engine, bolt up an electric motor, add a few batteries and you're off to the races. Or at least to the corner ice cream store in your new electric classic car. If it only it were so.