Since its launch over 18 months ago, Nissan's venerable flagship vehicle - now synonymous with these three famous letters:
"GT-R" - has pretty much done the impossible. It has taken on and embarrassed the world's most established supercar brands and proved that the Japanese mean business. But their quest for domination is far from over. On top of the recently factory tuned Spec-V, the GT-R has well and truly entered the aftermarket tuning scene where the possibilities, as they say, are endless. With most shops concentrating on fine-tuning the all-new, all-aluminum, twin-turbo VR38, there is one company that has grabbed our attention for their, well, different approach to things. In their search for additional performance they have created the world's only quad-charged Nissan GT-R. Four times the boost? Yes, please.
Located in the town of Fujinomiya, right at the base of Mount Fuji, Power Enterprise has become a well-established name in the Japanese tuning scene, with a reputation for creating some pretty mean rides over the years. Tominaga-san, the president, has a wealth of knowledge when it comes to building engines, due to his experience in rallying earlier on in his career. As every forward-thinking engineer, Tominaga-san is always thinking up new ways to improve the performance of cars, and over the last few years has relied greatly on supercharging. One of the first few cars we are shown in the workshop is his personal daily driver: a new-generation Toyota Land Cruiser sporting a supercharged V8, which cranks out almost 500hp! The Power Enterprise supercharger treatment has even made it down to the microscopic Toyota iQ city car (the soon-to-be Scion iQ), which helps its asthmatic 1.0L motor develop into puberty. But today it's the GT-R we are here for, winner of the "Best Modified Car" award at this year's Tokyo Auto Salon.
As development manager Ono-san explains, "After creating two basic tuning packages for the GT-R, we wanted to create something a little more special." With so much supercharging experience it was quickly decided that a pair of small blowers would be the best solution to boost power, and at the same time would also increase the lower-rpm torque curve. So how did they do it? First up a pair of Rotrex C30-94 superchargers were selected for their compact dimensions, and fitted at each corner of the engine where the stock air boxes used to be located. The layout is fairly simple; basically the charge that has been compressed by the stock IHI turbochargers is passed on to the Rotrex units, which further compress it up to 1.5 bar before sending it to the intercoolers. The best way to think of it is as a kind of helper-system to the factory forced induction, which is already capable of making great power on it's own - so as you can imagine, twice the boosting capabilities does a lot to the VR38's power curve. Ono-san fabricated all the custom aluminum piping that connects the blowers, something that wasn't so easy due to the lack of space. New intake pipes were made and mated to the Air Impulse II air filters, which have been located close to the center grille for better flow. The polished custom intercooler piping does away with any type of blow-off valve, something not required in a set-up of this nature.
On the exhaust side of things, a Power Enterprise Super Sonic titanium exhaust system helps increase power and response thanks to its larger diameter piping. To free up even more space, Ono-san fabricated a custom aluminum radiator overflow tank, which opens up space for the oil-tanks for the superchargers. These are connected to a tiny cooler that has been fitted in the center of the grille, all helping to keep the blowers operating at lower temperatures. Denso number 8 iridium spark plugs have been fitted along with the Power Enterprise P-map piggyback ECU, which has the job of managing the fuel and ignition maps, as well as the boost control. As a final touch the engine cover has been painted in Power Enterprise's signature blue, matching all the silicon joints of the piping. This quad-charger system boosts power to 600hp in the current mild state of tune (if you can call it that), which is up 120 hp from stock figures, but it's the torque curve that impresses the most with a massive 542 lb/ft! This set-up can theoretically flow up to 800hp, but Power Enterprise is shooting for a target range of 700 horses but are currently held back by the capabilities of the transmission and fueling, areas that are being addressed right now.
With such extensive research and design on the mechanical side of things, the exterior has been left pretty simple. To boost the car's already aggressive design, Power Enterprise has gone for a set of 20-inch Yokohama ADVAN Racing RSD wheels, a model that will soon be released in a true GT-R wheel fitment. The stock Dunlop SP Sport 600 tires are the rubber of choice for the R35, the ones that are used for all the record attempts on the Nordschleife. The stock Bilstein suspension remains, but has been joined by a Power Enterprise height adjustable conversion which allows the car to be dropped significantly for a more menacing stance. The stock look continues in the interior, which features grey leather seats with electrical adjustment.
For those preferring a simpler approach to more power, Power Enterprise can already boost the GT-R's output to 560hp thanks to their P-Map ECU, piping kit and air intakes. With the addition of the full-titanium exhaust system and a set of upgraded turbine actuators, power increases to 600hp. The Quad-Charger package, once fully-developed, will be the ultimate from Power Enterprise with the only questionable area of concern being the reliability of the gearbox. There are a lot of companies working hard to come up with clutch-pack upgrades; Pfitzner Performance Gearboxes in Australia have recently released upgraded first gear kits. With 542 lb/ft. available now, the finished kit will need some pretty hefty upgrades to the driveline to cope with all that twist. We can't wait to see the finished 700hp package!
2009 Nissan GT-R
Owner power enterprise
Hometown Fujinomiya, Japan
Daily Grind Tuning specialist
Under The Hood 3.8L VR38DETT; Rotrex C30-64 twin superchargers and twin oil tanks; Power Enterprise Super Sonic titanium exhaust, aluminum piping kit, silicone hoses, one-off turbocharger-to-supercharger piping, aluminum intake pipes, Air Impulse II filters, aluminum radiator reservoir tank and painted engine cover; Denso Iridium #8 spark plugs; supercharger oil coolers Hyper Ground System
The Power 600ps at 6,500 rpm; 542 lb/ft at 5,800 rpm; max boost: 1.5 kg/cm2 (current street configuration)
Brains Power Enterprise P-Map sub-ECU
Stiff Stuff Power Enterprise height adjustable conversion for stock dampers
Rollers Yokohama ADVAN RSD 9.5Jx20" (front) and 10.5Jx20" (rear) wheels; stock Dunlop 255/40/20 (front), 285/35/20 (rear)
www mackinindustries.com (ADVAN), power-enterprise.co.jp, powerenterpriseusa.net