Mercedes’ AMG arm is attacking just about every vehicle in the German automaker’s lineup, giving the brand’s luxury vehicles various levels of performance with a series of 63 and 43 offerings. However, it’s the two cars that AMG has developed from scratch that have pushed the bounds of how far Mercedes can go toward building a sports car or even a supercar. Those cars are the SLS AMG that made its debut in 2010 and the newer AMG GT, which was released as a 2016 model as a coupe and now gets a 2017 roadster companion.
The SLS and the GT are actually related. They both ride on the same basic platform, though the GT’s is evolved considerably from that of the SLS. The basic structure features an aluminum spaceframe with a center tunnel, a torque tube, a carbon fiber driveshaft, and a rear transaxle. The cars each feature long hood and set back greenhouses, too, and yet, they drive very differently.
The SLS AMG, with its 563-horsepower, naturally aspirated 6.2-liter V-8, was a beast. It crackled and snarled, and it’s handling, while certainly track-worthy, gained a reputation for being tail happy. Hit the throttle too early coming out of a corner and you wouldn’t come out of it so much as make it a 360-degree turn. The SLS was also unique in that it revived the gullwing doors from the original 300SL of the 1950s.
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The GT is more of a pure sports car. The tail happiness is gone, replaced by a hunkered down feel that makes it a viable competitor for the vaunted Porsche 911. The big cubic-inch V-8 is gone, too, replaced by a twin-turbocharged 4.0-liter V-8 in states of tune ranging from 469 to 577 horsepower.
At the recent Mercedes-AMG GT C Roadster launch in Arizona, I sat down with Axel Wolleson, overall vehicle development engineer for Mercedes-AMG to discuss how the SLS evolved into the GT and why the cars feel so different.
Shorter and lighter
Perhaps the biggest difference between the two cars is their length. “The difference between the SLS and the GT is, for example, the decreased wheelbase,” Wolleson said. The GT is shorter by 50 millimeters [1.97 inches], and in overall length, the GT is 90 mil [3.54 inches] shorter than the SLS. That means that we had a complete different package in the front area.”
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The length was removed from the bulkhead forward. The smaller-displacement V-8 engine was going to be shorter, so the front end could be shorter. Still, the addition of turbocharging presented some challenges. “We had a much more complex package in the front because a turbocharged engine needs a lot of more efforts for cooling,” Wolleson explained.
Cutting down the length meant cutting some weight. Chop out some of the structure and weight goes with it.
The SLS’s gullwing doors also added weight where you don’t want it: up high. “In the SLS, we’ve got a massive structure in the roof for the gullwing doors. In the GT coupe we have an aluminum greenhouse,” Wolleson said.