Porsche 991 GT3 will get a 3.8-liter engine with 450 hp

Article by Christian A., on June 6, 2012

Porsche is working hard on the all-new 911 (991) GT3 but insiders already spelled out the details of the new car. Set to make its debut at the 2013 Geneva Motor Show, the new Porsche 991 GT3 will get a normally aspirated 3.8-litre flat six and abandon the larger 4.0-litre powerplant used in the 997-generation GT3 RS 4.0.

According to Autocar, the new GT3 will deliver around 450 hp, with 15 hp more than the old model. This should offer a sprint from 0 to 100 km/h (62 mph) in 4.0 seconds and a top speed of almost 200 mph or 320 km/h. Moreover, the car is expected to be available with one transmission and we’re talking about a PDK seven-speed, dual-clutch automatic.

Although the PDK is heavier, the new GT will be lighter than the outgoing model, which had a kerb weight of 1395kg. In terms of design, the 991 GT3 will get a new body kit featuring wider air ducts, wider sills and flared wheel arches, 20-inch alloy wheels and the well-known rear exhaust that sits in the center. Furthermore, sources also confirmed a new GT3 RS that will get around 480 hp.

It is clear that the wide array of choices that the 911 GT3’s chassis presents with regards to vehicle dynamics is unprecedented. This is not a surprise though considering that this is a Porsche model. With a high-precision chassis serving as the basis, the way the various active systems is able to interact with each other in an intelligent manner means that the 911 GT3 will be able to deliver the needed driving quality to meet the present driving condition.

Aside from the chassis, Porsche will be offering e Porsche Torque Vectoring (PTV) Plus and the active rear-wheel steering for the first time with the 911 GT3. The brand hopes that with this, the driving options available will be increased. Rounding up these excellent features are the active damper system, Porsche Stability Management (PSM), and the active engine mounts. While looking into the active rear-wheel steering in particular, it is notably composed of two electro-mechanical actuators.

Thus under the 911 GT3, it is the active rear-wheel steering that is utilized on the left and the right side of the vehicle’s rear axle. This is different from the usual practice which is to have control arms.

Depending on how fast the car is running, it is possible to get the steering angle of its rear wheels go by as much as 1.5 degrees. In addition, contingent to how the steering wheel is turned, there are two possible results to expect. The first is what happens when both the wheels in the front and the rear are steered in the same direction. This results in the felt wheelbase expanding.

As such when changing lanes, more stability is offered. In addition, it also improves driving stability which is important when going at high speeds. When compared to a rear axle that is non-steered, the side force experienced on the rear axle increases at a faster rate. Note that this side force is activated by the driver’s steering input. Thus as the vehicle starts to change direction, it is more harmonious and spontaneous.

This particular effect occurs when the 911 GT3 is running at least 80 km/h. The second effect happens when the wheels are steering in different directions, particular in opposing directions. What happens is that the 911 GT3 gets a shorter wheelbase, much shorter even when compared to the previous model. Since it now has the agility like that of a go-cart, it is more agile when going into curves and it can even bend that much more dynamically. The effect occurs when running at speeds not going above 50 km/h, meaning the turning radius is lowered. Further, parking and maneuvering become that much easier.

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