“G-force is a measure of acceleration or deceleration based on Earth’s gravity,” explains Félix, D-BOX haptic developer. One G equals roughly 9.8 m/s² — the constant acceleration we all experience simply standing on the planet. In racing, additional G-forces are created whenever the car changes speed or direction. These are not rotational forces; they are linear accelerations acting forward and backward, side to side, or up and down.
The key limitation is physical: “G-forces are linear forces… and they require large distances to be strongly felt.” In other words, sustained G-force depends on mass being accelerated across space. A home racing simulator does not physically travel 200 km/h into a braking zone or sweep through a corner at lateral load. It remains stationary. Which means it cannot reproduce real, sustained G-forces in the literal physics sense — only the sensations that our bodies associate with them.
In racing, G-forces act in three directions: longitudinal, lateral, and vertical. “The G forces are exerted on a 3-dimensional plane: longitudinal accelerations and decelerations front-back, lateral left-right, and vertical up-down" explains Félix.
Longitudinal forces occur under braking and acceleration — the moments Daniel describes when “everything gets heavy” under braking or when “you feel the rear squat and your body press back into the seat” under throttle. Lateral forces dominate in corners, where you are “pinned into the side of the seat” as load builds through the chassis and into your ribs and hips.
Vertical forces appear over crests, compressions, and curbs, creating sensations of lightness or heavy compression as the suspension moves. Of the three, Félix notes that “the most important are the longitudinal and lateral forces,” because they communicate weight transfer — the movement of mass across the car — which is what drivers rely on to understand grip, balance, and direction.
A static simulator can reproduce visuals and steering feedback, but it cannot reproduce weight transfer through the body. “The biggest thing missing in a static rig is weight transfer through your body,” says Daniel Morad. “You still have steering feedback and visuals, but you do not feel the nose dive under braking or the rear getting light on entry.”
In a real car, those load shifts happen before you consciously process them. “Your body is constantly processing those loads without you thinking about it,” he explains. Without that physical layer, drivers rely almost entirely on their eyes and hands. The result is often delayed reactions and exaggerated inputs. As Morad points out, without G-forces “you do not feel how aggressive your brake application really is,” which leads many sim racers to spike the pedal, release too abruptly, or carry too much speed into the corner. In a static setup, the warning signs appear visually or through the wheel — usually a fraction later than they would in a real car.
Because real sustained G-forces require physical displacement, a simulator has to work differently. “Since our racing simulators are static, we have to trick the human brain by moving the system to compress parts of the body at the right moment,” explains Félix.
Instead of generating true linear acceleration, motion systems rely on telemetry — acceleration and velocity data — to recreate the sensation. “We use acceleration and velocity data to recreate these sensations,” he says; the higher the value, the faster and more pronounced the movement. When a real car accelerates forward, the body feels compression in the back as the seat pushes into you.
In simulation, that sensation can be recreated through surge movement, rearward tilt, or a combination of both. The objective is not to replicate full physical displacement, but to reproduce the pressure your body expects to feel during load transfer. When that compression happens at precisely the right time, the brain interprets it as force — which is why, as Daniel Morad recalls, “the car suddenly felt like it had mass.”
Not all G-forces are equally difficult to simulate. According to Félix, sustained longitudinal and lateral forces are the most challenging because they require physical displacement over distance — something a compact system simply cannot provide. “G-forces are linear forces, and they require large distances to be strongly felt,” he explains.
In real racing, braking and cornering loads build and hold as the car continues moving through space. A home simulator cannot maintain that sustained acceleration without traveling meters across the room. Vertical forces, by comparison, are more manageable when enough actuators are available, allowing for realistic sensations of compression or lightness over crests and dips. The limitation is space and travel range.
As Félix notes, large commercial systems can generate more sustained forces, “but it takes an entire hangar and rails.” For domestic platforms, the solution isn’t bigger movement — it’s precise, well-timed cues that communicate the change in load, even if the full force itself cannot be physically sustained.
For a driver, G-forces are not about sensation — they’re about timing. “Driving fast is about managing load, not just being aggressive,” says Daniel Morad. When you can feel weight transfer through your body, you know exactly when the front tires are loaded enough to turn or when the rear is getting light under braking. “If you can feel when the front tires are loaded enough to turn or when the rear is getting light, you can adjust earlier and smoother,” he explains.
That early awareness is what creates consistency. Without physical load cues, corrections happen after the fact — once the car is already sliding or pushing wide. But when the body receives clear information, inputs become more disciplined. As Morad puts it, reacting to load in real time “makes you more consistent because you are reacting to what the car is doing instead of correcting after the fact.” In performance driving, that difference is measured in tenths — and sometimes more importantly, in repeatability.
A simulator will never generate real sustained G-forces the way a race car does. It doesn’t travel through space, it doesn’t build load over hundreds of meters, and it doesn’t physically pin the driver into the seat with continuous acceleration. But that isn’t the real objective. As Félix explains, the focus is on synchronization and delivering “informative effects first and foremost,” rather than chasing large, dramatic movements.
And for Daniel Morad, what ultimately matters is whether the driver can feel load build, hold, and release — because that’s what communicates grip. The goal isn’t to recreate gravity itself. It’s to recreate the information gravity provides. When motion is timed correctly and aligned with steering and visuals, the simulator doesn’t just move — it communicates. And in racing, communication is what allows drivers to trust the car, react earlier, and perform consistently.
To see our motion in action, follow D-BOX on Instagram and Facebook.