Car Spotlight>> Koyama Racing Labo Evo X

This was probably the biggest surprise at the Super Lap Battle last week, the Koyama Racing Labo Evo X built in collaboration with Team Orange. Anyone familiar with the world of JDM tuning will have no doubt have heard the name Koyama, he is of course the man behind most of the projects that JUN has built over the last two decades. Earlier this year however he decided it was time to move on, time for a change and joined the guys at Team Orange up in Nihonmatsu, the home of Ebisu circuit.

Koyama-san is no stranger to the Evo X, he built Kumabubo's RWD CZ4A sporting that crazy longitudinally mounted 4B11 mated to a Hollinger sequential, not to mention Kuma's previous rides, the GDB and the Evo 9. 

So creating a Time Attack oriented Evo X was a sort of logical choice for his first project as an independent tuner. The Koyama Racing Labo team showed up at Tsukuba with this new car ready to put it through its paces in what was more like a shake down test rather than a proper super lap attempt. Despite this the car, competing in the Open-4WD class managed to be the second fastest Evo X of the day, with a 58"368 lap, just behind the Varis car, which managed a slightly faster 57"963. The reason this car is so fast is down to some pretty serious engine mods…

…which have made the engine bay almost unrecognizable. The most noticeable piece has to be the billet intake manifold, armed with a bigger diameter throttle to supply more air to the stroked engine. Details are still scarce but the 4B11 runs an externally gated Blitz turbocharger which dumps gasses into a custom exhaust system.

The radiator has been tilted backwards to allow the custom intercooler to be positioned higher and in the engine bay to keep piping short.

The interior is pure race car. The shell is stiffened thanks to a custom built and braced roll-cage while everything else, save for the steering column, has been ditched. A paper-light carbon dashboard covers all the nasty wiring and bracing around the firewall… 

…while the instrumentation has been replaced by a Racepack IQ3 data logger supplied in Japan via Tomei Powered.

Now that is a race seat!! You can see just how stripped the rest of the car is from this angle, and like any great project car the chassis was sprayed even inside before the build began. And yes, those are air jacks you see welded in place there…

…then all you need is a little air. Beats a manual jack any day!

Koyama-san has always been a great admirer of Endless products so behind the Enkei RC-T4 wheels…

…you can see the top of the line 6-pot monobloc Endless calipers (4-pots at the rear) mated to floating E-slotted discs. Suspension is based around Zeal dampers.

Car looked great out on track with Mitsuhiro Kinoshita doing a great job of getting a 58-second lap time.

It's great to see tuners getting such great results out of these new CZ4As, I'm sure we will see them get much faster in the course of 2010 with cars from HKS, Varis and Koyama Racing Labo pushing the envelope further.

-Dino Dalle Carbonare

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