The GT3 for me is the 991.2GT3 Touring PackageIt is.
I bought it a few years ago, and while I was impressed by its sheer performance, I had to let it go after about a year and a half due to the stress of not being able to accelerate and enjoy it enough on public roads, although I bought it solely because of my admiration for the GT3.

While I have no regrets about selling theI often wish I could taste the GT3 engine again, even now.

This time, I would like to share with you a brief but comprehensive history of that engine, with a special focus on the GT3 engine.

Engine specs of successive GT3s

In this way, the original GT3 had only about 360 hp, which is less power than the current Carrera and would lose out in acceleration.
Nevertheless, when one actually drives the 996 GT3, the engine characteristics are completely different from those of a modern Carrera, and its revving speed and sensuality are spectacular.

Then, in about 25 years or so, power has increased with each successive model to over 500 hp. And now, for the first time in the later 992 GT3, the torque has been slightly reduced. This is said to be due to environmental regulations.

History of the GT3 Engine

In this way, the engines of successive generations of the GT3/GT3 RS have steadily evolved in each generation, and the process can be summarized as follows.

 The age of the Metzger engine (996/997)

The first and second generation GT3s wereHans Metzger DesignThe engine is powered by a race-derived engine from the

Robust construction with crankcase directly derived from air-cooled 911 and Le Mans cars (962/GT1)and features external tank type dry sump lubrication and high RPM resistance through extensive use of forged and lightweight parts.
The displacement was initially 3.6 liters, increased to 3.8 liters in the latter half of the 997, and finally to 4.0 liters. A variable-length intake (vario-ram system) and vario-cam (variable valve timing) were combined for the intake air, and it is said to have achieved a feeling of being able to blow up to a high rpm of over 7,000 rpm at once while securing low to mid-speed torque.
The compression ratio started at 11.7:1 and reached over 12:1 from the 997.2 onward. The 997 GT3 RS 4.0 in particular achieved 4.0 liters and 500 PS, boasting an amazing power density of 125 PS per liter.
Metzger engines consistently use port injectionThe basic design was very robust and reliable due to its direct motorsports background, and the electronic controls were refined in the later years,Described as "the ultimate in NA."The first is characterized by the following.

Metzger engine with GT1 crank

The Era of New Generation Direct Injection Engines (991/992)

From the third generation 991 GT3, the engine design has been renewed, and Porsche'sUnit tuned specifically for the GT3 based on the mass-produced direct-injection flat-6 (9A1 type)Transition to.

This further improved the compression ratio (12.9:1 for 991.1 and 13.3:1 for 991.2) and significantly improved combustion efficiency and power output.
With direct injection, piston cooling and knocking control have been strengthened, enabling stable high-rpm combustion even at high compression ratios. 991 has expanded variable valve timing to both intake and exhaust (VarioCam), combined with a variable lift mechanism (VarioCam Plus).

The lubrication system has been changed from the conventional external tank system to a dry sump built into the engine, but it is still a full-scale system with seven recovery pumps to maintain hydraulic pressure even under high lateral G forces.
The 991.1 (3.8L) achieved 475 PS at 9000 rpm, and the 991.2 (4.0L) reached 500 PS. The 991 generation is also characterized by the evolution of vehicle control, including the adoption of PDK and the introduction of rear-wheel steering, which ensures that the engine output is utilized on the road surface.
In the 992 GT3, further racy improvements such as a 6-stroke throttle system increased the PS to 510 and the response was the best of all time. Result,NA engine, yet still manages to break 7 minutes at the Nürburgring.Its performance has reached a level that rivals that of turbo models, such as

Differentiation of the GT3 RS

In each generation, the GT3 RS basically follows the GT3 engine, but improves performance through tuning that focuses on the high-rpm range, optimization of intake and exhaust, and further weight reduction.

The 996/997 first half had unchanged power output, but from the 997 latter half onward, the RS realized a slight increase in power output (+15 to +20 PS).
In particular, the "RS 4.0," a version with a larger displacement, appeared in two generations, the 997 and 991, both of which reached the 500 PS mark.The RS uses a high-revving cam profile and lighter moving parts to further sharpen the rev limit.The 992 GT3 RS is designed to achieve a slight time difference in circuit driving. In addition, the recent 992 GT3 RS has a small differentiation in the engine itself, but the performance difference from the GT3 in terms of aerodynamics and chassis has been widened significantly, resulting in a large advantage in lap time, and the chassis side has also been characterized by significant evolution.

In this way, the 911 GT3/GT3 RS engines are consistentlyNaturally aspirated, high rpm, high power."It is worth mentioning that even now, more than 25 years after the 996's birth, its 4.0-liter flat-six engine can reach a maximum of 9,000 rpm and deliver an astonishing 125+ PS per liter. It is worth mentioning that the 4.0L flat-six engine still delivers astonishing specifications of over 125 PS per liter at a maximum of 9,000 rpm.

This is the result of Porsche's engineering and motorsports feedback, which has resulted in the 911 GT3"A racing car that can be driven on public roads."This is the reason why it is called "the tradition of the environment. In this day and age of environmental regulations, it will be interesting to see how this tradition will continue to evolve in the future.