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A possible convert? 330 hp in a 900 kg Mazda 818 or rwd 323 will give you a car that can pass the 1/4 in 11 seconds and will wheely. The pics of the 4 rotor engine show creation of the peripheral port, the ultimate in Na tuning although no good for street use. The hp increase from 7500 to 10 k is something like 100. Virtually un drivable below 6 k, the Australians describe driving a heavily ported motor at low rpm as pig rooting. My wife could not drive my Rx7 as that was ported and just driving slowly in traffic you had to drop the clutch an rev it, other wise it would buck because of the over lap, it was like constant whiplash for her and my daughter. Shame she couldnt drive it properly.
VintageJon
Reading up on turbo'd rx7. There was one place that built the official turbo for the UK.
There are drag people that get 1200bhp out of the pretty standard ish engine. 700bhp is easily possible on standard engines.