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Mazda RX4 rotary turbo dyno & drag racing

For those of you who don’t know the Mazda RX-4, here is a quick lesson.  The Mazda RX-4 was sold in the US from 1974 – 1978.  The stock 13B rotary engine came with 110hp and 117 ft/lb of torque.  The track numbers were a 11.7 Second 0 – 60 and an 18 Second 1/4 mile at 77.5 mph.  At the time this put the RX-4 on Road & Track Ten Best list for “Best Sports Sedan” in 1975.  Today you can get better performance from even the cheapest model Kia.

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This is NOT the case with this particular RX-4. Andrew’s Mazda RX4 is back on the dyno with a boost increase to 27 PSI. Tuned by Promaz Automotive power comes from a 13B bridge port rotary engine and boosted by a Garrett T66 turbocharger, a MicroTech EFI system and running C-16 fuel. This set up equates to a 623hp to the wheels.  A HUGE improvement over the 110hp at the flywheel from the factory.

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Another huge improvement is shown at the race track the following night at Calder Park.  The RX-4 leaves the line at the dragstrip standing on the back 2 tires and puts a 10.07 second 1/4 mile pass @ 140.74 mph on the board.  8 seconds faster than the stock version and almost double the trap speed.

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