One of Melbourne’s coolest street rotary Mazda’s, Ross’ Promaz built RX-3 sedan is a real crowd favourite. Already an 8-second car, the team was keen to step things up. A complete engine bay overhaul was carried out which now sees a Promaz Racing 13B Cosmo engine featuring Billetpro plates, stud kit and engine plate. A larger Garrett GTX47 turbocharger is fitted along with a switch to a Fueltech F600 fuel system. The same Samsonas 6-speed sequential gearbox is retained. We caught up with the team as they were preparing for the Brisbane Jamboree.
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1972 Mazda RX-3 street car
Promaz built 13B Cosmo rotary engine
Billetpro front and rear plates, billet crank
RX-7 lightened & balanced rotors
Billetpro stud kit & engine mid plate
Garrett GTX47R turbocharger
Fueltech F600 ECU, Pro-Jay manifold
Samsonas 6-speed sequential gearbox
Promaz CNC billet bellhousing
Leaf springs & Caltracs
26×8.5in drag slicks
Built & tuned by Promaz
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