Electric Porsche 944

An Overdue Update

by on May.18, 2020, under Electric Car

First I’ll say, the car is fantastic, full stop.

The drive system has been flawless, the Siemens AC motor is smooth and powerful. The Azure Dynamics DMOC645 has been great, I had the water pump feeding the DMOC fail and instead of stranding me on the side of the road, it simply throttled down the power to keep itself in a safe temperature range. I was able to gently drive home without incident.

The stock heater core in the 944 (which could very well have been the original making it 33 years old) failed, leaking coolant all over the interior. There is a plan shortly to remove the heater core and switch to PTC heaters in place of the stock heater core.

With various changes over the years more items have ended up in the rear of the car than originally planned. The front battery box was removed when I switched over to the Siemens motor, the 12v car battery ended up in the rear in the form of a 4S LiFePO4 battery pack. The DC-DC converter has always been in the rear but there was always a plan to move it to the front. The Brusa charger also lives in the rear. This wasn’t the original plan for weight distribution where I wanted 50-55% of the weight in the rear.

The total weight of the car is still inline with the initial target, however VERY close. 1360 Kg = 2998 Lbs
Front axle weight is 510 Kg = 1124 Lbs or 37.5%
Rear axle weight is 850 Kg = 1874 Lbs or 62.5%

For this reason I’ve already started the shift forward, the 12v battery, DC-DC converter and the Brusa charger are migrating to the front.

  • 12v battery = 18 Lbs
  • DC-DC converter = 8.5 Lbs
  • Brusa charger = 14 Lbs

Now this only totals 40.5 Lbs, however it has an 80 Lb shift in weight distribution moving back to front. Or almost a 1.5% improvement right there.

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