Porsche’s new GT3 RS 4.0 is perhaps the ultimate track-oriented street car. Its 4.0 liter flat six engine (which features titanium connecting rods and the same crankshaft as the 911 GT3 RSR race car) produces 500 hp at 8250 rpm, making it the most powerful naturally aspirated 911 engine in Porsche’s history. With a curb weight around 3000 pounds, Porsche estimates 0-100 km/h (62 mph) in only 3.9 seconds. Factor in its track-tuned chassis and aero package, and well…it is a car that we’ve wanted to get our hands on from the moment we first heard about it.
So we were pretty excited when our good friend, James, placed an order for his very own. And we were even more excited when it actually arrived in the U.S. – number 422 out of only 600 total! Yes, this was definitely a car that deserved to be fit with a wheel that, like the GT3 RS 4.0 itself, is the ultimate in lightweight performance: the Forgeline one piece monoblock GA1R!
So with a few measurements in hand, we engineered what we hoped would be the perfect fitment (19×9 +46 in the front and 19×12 +46 in the rear), combined them with new Michelin Pilot Super Sport tires (245/35ZR19 in the front and 325/30ZR19 in the rear), and installed them on our new 4.0 as soon as possible. What you see here is the final result. And yes, it is perfect.
As you might expect from someone that owns a brand new GT3 RS 4.0, James is a man of high standards and perfectionism. He is a licensed professional engineer who has worked for General Motors, Ford Motor Company, Robert Bosch, and others. He is a published author, professional lecturer for the Society of Automotive Engineers, and expert in the field of vehicle control systems. And to top it all off, he is also an Advanced Driving Instructor for the Lone Star Region Porsche Club of America.
So what does James have to say about his Forgeline GA1Rs? He says, “They are just stunning. The design, the finish, the machining detail…everything about them is just incredible.” He adds, “Installation was as good as OEM with no worries at all. TMPS sensors mounted up without problem. It was just seamless.”
But of course, you don’t change the wheels on a car like the 4.0 just to look pretty; they obviously need to provide performance benefit, as well. So being an engineer, James also collected data on wheel weights. The result is a 3 pound savings per wheel in the front (23 lbs. for the OEM Porsche wheel versus 20 lbs. for the GA1R) and a 5 pound savings per wheel in the rear (27 lbs. for the OEM Porsche wheel versus 22 lbs. for the GA1R). Plus thanks to the smaller offsets, two millimeters of additional track width in the front and four millimeters of additional track width in the rear provide a slight reduction in roll coupling, not to mention gorgeous aesthetics.
The Forgeline GA1R is a fully-forged one piece monoblock wheel that utilizes much of the technology and design of our very successful GA3R racing wheel, including our new “I-beamed” spoke technology. The concave design of the GA1R not only looks great, but allows plenty of room for caliper clearance and extreme brake fitment, while the one-piece monoblock forging and I-beamed spoke design yield a wheel that is extremely stiff with exceptional fatigue strength. And yet despite the strength and stiffness, for most applications and sizes, it also delivers a high-performance weight reduction – making it perfect for motorsports and racing applications!
The GA1R is designed for racing. It is engineered with a 2100 lb. street-tire load rating (per wheel) to ensure strength and integrity, even when subjected to the massive loads encountered on the stickiest race tires.
The GA1R is produced using our traditional forging method from 6061-T6 aluminum. It is currently available for Porsche center lock applications in 18 and 19-inch diameters and for 5-lug applications in 18, 19, and 20-inch diameters with a range of widths and offsets. And just like any Forgeline wheel, the GA1R is available with fully customizable finish options.
Learn more about the GA1R for 19-inch Porsche center lock application in our online store at: http://www.forgeline.com/products/center-lock-wheels-and-center-lock-conversion/porsche-center-lock/19inch/ga1r-porsche-cl-19.html