How Singer And Red Bull Made Open-Top 911 Turbos 175% Stiffer

Singer wanted its new Classic Turbo Targas and Cabriolets to feel just as solid and fun as its coupes, not just look good parked. So, instead of guessing, it went straight to people who know a thing or two about stiffness and speed: Red Bull’s engineering crew.

The Classic Turbo project is Singer doing what it does best - taking a Porsche 964 and turning it into a wide-body, high-power tribute to the old-school 911 Turbo. The issue? Open-top cars like the Targa and Cabriolet were never as rigid as coupes. 

Lose the fixed roof, then add modern suspension, sticky tires, and way more power than the original Turbo, and things can start to feel a bit wobbly. Red Bull Advanced Technologies stepped in to fix that. This is the same team behind Red Bull’s racing and special engineering projects. Singer basically asked them to make an open-top 964 feel rock-solid without adding a ton of weight or messing with the car’s original layout.

First, the engineers scanned the entire 964 chassis and built a digital model of it. Then they pushed it hard in simulations to see where it flexed the most. Once those weak spots were clear, they designed 13 carbon-fiber reinforcements to support the structure.

Those parts are bonded directly into the original steel body during Singer’s rebuild process. Nothing flashy, nothing bolted on as an afterthought. The result is a claimed 175 percent increase in rigidity.

That’s a big deal. It means the car should feel tighter over bumps, more stable under braking, and way more confident when you push it through corners. In short, these open-top Singer Turbos should drive like proper sports cars, not like convertibles making excuses.