Interesting! We are running our R's at 1.5Bar Boost on the GT28 Turbo Kit with ancillary mods and making around 331Kw and 550Nm.
They tend to run a 12.1 on pump fuel with this setup and low 11's on Race Fuel on the 1/4 mile so its really nice to get a chance to compare to an overseas vehicle like yours. Our record so far is a 11.6 on a stock Turbo on the 1/4 in an R on Race Fuel.
Keep up the great work John! Your car is very inspiring.