Sawa San is a man with hell of a lot of knowledge about the sports cars and therefore his approach towards them -- when it comes to improving their performances – is firm. He has a habit of saying “Power is nothing without control”, so the first thing he suggests to his customers is to improve their braking and suspension before starting to pump up on the horsepower. The R 34 is a perfect example of this way of thinking, having literally all parts being driven to its limit, especially when it comes to the engine department.

Until last year, 2.7 liter RB 26 was the favorite choice for a power source under the hood. But later, the very special and unique OS Giken RB, 3.15 liter had come, which is an updated version of the distinguished OS’ RB 30 kit. It is based on the very strong N1 Taikyu block and thanks to the usage of a slightly longer stroke and fully counterbalanced crankshaft, stronger connecting rods, and 86.5 mm forged pistons, its capacity has been increased to 3, 138 cc. The block is now extended by a precisely machined 26 mm spacer (increased 3 mm from the older RB 30 kit) and special head bolts had been used in order to contain the increased stroke.

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