After a bumpy start for sister brand Audi’s e-Tron, the Taycan, with the top Turbo S version priced at $185,000, is for the time being the flag-carrier in VW’s massive drive to unseat e-car pioneer Tesla Inc. The wraps came off Wednesday at simultaneous events in its three biggest markets, with Porsche -- known for churning out roaring sports cars -- presenting the vehicle bathed in a backdrop of sustainable-power imagery.