Last year at the famed Rev Speed Battle at the World Famous Tsukuba track in Japan an interesting orange Evolution X show up to run with the big dogs. All the big players were out in force. Well when everything was said and done the Koyama Racing Labo Evo placed 7th. It just so happens that Tuning legend Koyama-san had decided to build the fastest Evo in Japan. Although the Varis Mitsubishi Evo X placed one spot higher, this was a mere shakedown for the Koyoma Evo. The ingredients for this kick-ass machine are: a bigger displacement engine with more than 600 horsepower, loads of carbon, and a lot of weight loss.
If you have paid attention to the best tuners out of Japan than one name has always stood at the top. Susumu Koyama until early last year was the Vice President of JUN Auto. One of the most respected tuners in Japan and the world for that matter. He was the creative brain behind the crazy projects from 400-km/h-300-ZX to the Hyper Lemon R33 GT-R and the all-wheel-drive 350 Z, just to name a few. 2005 Jun and Team Orange worked together on a rear-drive Impreza for Kumakubo.
Nestled under the carbon fenders are a set of Enkei Sport 18 inch wheels with Hankook semi-slicks. Now the chief mechanic of Team Orange Koyoma decided to finally to leave Jun and become a permanent member of Team Orange. Last December he appeared at the Tsukuba Super Lap Battle with a new creation of his company: Koyama Racing Labo (KRL). Already one of the fastest; the car carves an impressive lap time of 58.368 seconds in the asphalt. This Evo X goes beyond the boundaries of existing projects. Originally the CZ4A was considered difficult to be modified due to its existing aluminum engine. Koyama showed us its potential in one race.
The Evo is really wild and make a visual impact. The mighty SARD rear wing presses the wheel firmly on the asphalt. Koyama is accustomed to building fast EVO's. He built both the Jun Evo X for the Time Attack races and Kumakubos rear-wheel drive drift Evo. The KRL Mitsubishi Evo X wants to be the fastest in Japan. A few months ago the modifications began. First the body was stripped down to the shell and was significantly strengthened by welding all the seams. A custom made roll cage provides safety. The only other noticeable part still left in the cockpit is the carbon fiber Recaro bucket seat. Even the dashboard had to give way to a lighter carbon copy. To speed up pit stops, the Japanese installed air pressure-operated jack. The entire interior has been designed with race track driving in mind and this goes to show with the perfectly located controls. On the outside an M-Sport front grill looks menacing but deflect air to the intercooler and radiator. A Carbon fiber front lip mounted low provide downforce. M-Sport also contributed the side skirts and fender flares. The carbon fiber doors also further reduce weight. The carbon fiber trunk lid and rear wing made of carbon from SARD complement each other. Carbon mirrors complete the exterior. At all 4 corners are super lightweight Enkei RC-T4 18-inch rims are mated to sticky Hankook Ventus TD 275 width tires completes the look.
KRL has packed everything that is available into the engine compartment with the hopes of making the Evo faster and stronger. Koyama has a good relationship with the most prestigious parts and accessory manufacturers in Japan, not to mention an inner knowledge of JUN parts. Consequently, only the best components are used in this Evo. Starting with the adjustable Zeal Super Function Type-E coilovers with adjustable race dampers. The brakes are Endless six-piston front calipers and four-piston rear calipers stuffed with Endless brake pads. These are huge units at 380mm up front and 330mm out back. But most impressive is the total engine overhaul. Koyama increased engine displacement to almost 2.3 liters up from the stock 2.0L. For this he uses a special crankshaft, forged connecting rods, and an extremely lightweight 86.5-millimeter piston. A 1.2mm thick metal head gasket to withstand the massive pressure of the huge turbo. The head itself is decked out with 264 degree camshafts on the intake side and extreme 272 degree camshafts on the exhaust side. A Naprec 80mm throttle body, replaces the modern electric version. 4 SARD-1000-cc/min fuel injectors are fed by the SARD fuel pump. The power from the EVO X engine is estimated to be around 600 horsepower and 500 lb-ft of torque. That is a lot of work for the twin-disc clutch of ORC and the modified five-speed gearbox. There are also specially coated gear wheels and shortened fifth gear. The Locking differentials on both axles distribute the power between all four wheels. This is going to be one MONSTER Mitsubishi Evolution X. The head itself is decked out with 264 degree camshafts on the intake side and extreme 272 degree camshafts on the exhaust side. A Naprec 80mm throttle body, replaces the modern electric version. 4 SARD-1000-cc/min fuel injectors are fed by the SARD fuel pump. The power from the EVO X engine is estimated to be around 600 horsepower and 500 lb-ft of torque. That is a lot of work for the twin-disc clutch of ORC and the modified five-speed gearbox. There are also specially coated gear wheels and shortened fifth gear. The Locking differentials on both axles distribute the power between all four wheels. This is going to be one MONSTER Mitsubishi Evolution X. The head itself is decked out with 264 degree camshafts on the intake side and extreme 272 degree camshafts on the exhaust side. A Naprec 80mm throttle body, replaces the modern electric version. 4 SARD-1000-cc/min fuel injectors are fed by the SARD fuel pump. The power from the EVO X engine is estimated to be around 600 horsepower and 500 lb-ft of torque. That is a lot of work for the twin-disc clutch of ORC and the modified five-speed gearbox. There are also specially coated gear wheels and shortened fifth gear. The Locking differentials on both axles distribute the power between all four wheels. This is going to be one MONSTER Mitsubishi Evolution X.
photos via http://speedhunters.com/archive/2011/02/21/car-feature-gt-gt-koyama-racing-labo-evo-x.aspx
