It may be hard to believe, but there are still some people left in this world that haven't heard of JUN Auto Mechanic. One of Japan's most well-known tuners, JUN has applied its horsepower-inducing magic to such cars as the Skyline GT-R, Lancer Evolution, Fairlady/300ZX, Impreza WRX and Silvia. With a keen eye set on building shop vehicles that are the complete package through and through, JUN Auto regularly takes its demo cars out and proves them at the Bonneville Salt Flats, Tsukuba Circuit and on the drag strip.
As a division of parent company Tanaka Industrial, JUN Auto benefits from years of experience developing and manufacturing automotive parts. In the precious few years since its inception, JUN has steadily risen through the ranks of Japan's elite by proving that its products are more than just conceptually designed pieces. This was no more apparent than with JUN's stable of brilliantly colored project cars. The blazing yellow and forest green theme has been a JUN trademark for more than a decade, appearing on the Super Lemon R33 Skyline, the U.S.-stomping Hyper Drag EK Civic and the 2.5-liter Super Lemon WRX. Bright and eye-catching, the paint job screams out like a danger sign, warning all on-track opponents to check their rearview mirrors for the yellow beast rapidly approaching.
Although the strut-suspended DC5 Integra platform has proven more difficult to tune than the DC2 design for many tuners, JUN Auto undertook the task with relative ease. Having already eked out impressive results from the EK Civic and the fourth-generation Prelude, JUN is no stranger to the front-drive Honda world. A regular at Tsukuba Circuit time attack events, this 2005 Integra Type-R has already recorded a 1:02 lap time during shakedown. To put that into perspective, if you read our cover car article then you know that the overall lap record for a production-based car is held by the insane carbon-bodied HKS TRB-02 Lancer Evolution VIII with a time of 54.74-seconds. With results this good coming out of a naturally aspirated, front-drive platform, JUN Auto deemed this car, known as the Super Integra DC5, worthy of its ferocious yellow looks.
The most revered of all Honda namesakes, the Type-R badge is applied only to those models that are designed to be true driving performance machines. The DC5 Integra Type-R comes to the table packing a 220 hp 2.0-liter engine, six-speed transmission, Brembo brakes and Recaro seats. For JUN's track attack however, even Type-R parts wouldn't cut it. The K20A powerplant uses a square 86 mm bore and 86 mm stroke to achieve its twin liters of displacement, and JUN's custom prototype pistons retain the stock bore size. The rest of the bottom end, including the crankshaft and connecting rods, remain stock Honda Type-R.
Up top, one-off JUN prototype camshafts spin on JUN prototype valve springs. A JUN carbon fiber airbox feeds the stock Type-R intake manifold load after load of air, which is all later expelled through a JUN 4-1 header and 70 mm titanium exhaust system. The fuel system remains stock but JUN has tuned the entire setup with a GReddy E-Manage Ultimate engine management system. Still in development and eagerly awaited by legions of Honda owners, JUN's custom camshafts help this DC5 lay down 256 hp at 8500 rpm and 170 lb-ft of torque at 6400 rpm on JUN's engine dyno.