How to build a tuner car ~ 20B rotary RX8 by Promaz

Although a very well balanced car, the Mazda RX8 always lacked a little go in the horsepower department compared to the older RX-7 it replaced. Peter’s 2009 GT spec street RX8 is a great example of tuner build done well. Rather than persist with the factory 13B 2-rotor Renesis engine the Promaz team has installed a 20B 3-rotor engine using … Read More

Sound of the 20B Rotary Engine

Charles’ Mazda RX-7 is one wild rotary. Power comes from a Promaz bridge ported 20B triple rotor engine and boosted by a Garrett GTX42R turbo running on methanol fuel and backed by a Jerico 5-speed gearbox.¬†At Easter Car Mania Charles sure gave the Mazda a solid workout. Mazda RX-7 FD Promaz 20B rotary engine – Bridge-ported & dowelled Garrett GTX42R … Read More

Mazda 323 gets loose – Jamboree testing

Andrew’s Mazda 323 [ BZJNKI ] has recently undergone the progression from street car to race car. The most notable changes have been in the way of a switch to E85 fuel and the fitment of a Ford Top loader gearbox using Liberty dog gears. Power comes from a Promaz Racing 13B bridge ported rotary engine boosted by a Garrett … Read More

Mazda MX5 turbo dyno

After initially building a higher compression naturally aspirated Mazda BP 1.8L engine, Steve’s MX-5 / Miata street car has since been boosted in the way of a Garrett T28 turbo making for a solid power to weight ratio.

13B turbo Mazda RX4 street car dyno

Vlad’s RX4 has remained the same for sometime. In fact the 13B turbo rotary engine by Promaz Automotive has been in it for 13 years. A Turbonetics turbocharger and MicroTech EFI fuel system aid power.

13B turbo rotary Mazda wagon

Brad’s very neat Mazda 1300 wagon is a great looking street car. A nice power up comes in the way of a Promaz Automotive 13B bridge ported RX-7 FD rotary engine boosted by a Garrett T66 turbo and MicroTech EFI fuel system.

8-second Mazda RX3 dyno run

Ross’ 8-second street driven Mazda RX3 on the dyno at Promaz Automotive. The car is powered by a Promaz 13B rotary bridge port engine, MicroTech EFI and boosted by a Garrett GTX42R turbocharger through an Albins equipped RX-7 h-pattern gearbox.

Rotary 20B turbo RX7 – Dyno & track

Built as an all-round event’s car, Charles’ Mazda RX-7 has undergone serious chassis and engine changes including a Promaz Automotive bridge-port 20B rotary engine. Boost comes from a Garrett turbocharger while the engine runs on methanol fuel controlled by a MicroTech LT16 computer and LTC dash logger. Backed by a Jerico 5-speed dogbox, the clutch was suffering on the dyno … Read More

Shifting gears – 13B turbo Mazda RX3

Ross’ 8-second street driven Mazda RX3 features a Promaz Automotive 13B rotary bridge port engine, MicroTech EFI and boosted by a Garrett GTX42R turbocharger through an Albins equipped RX-7 h-pattern gearbox.