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Improved Production is one of the fastest growing categories of circuit racing in Australia. It is classified by CAMS as category 3J (see the competitors area for a link to the technical regulations). An Improved Production car is loosely based on a modified road car, and is made popular by the fact that it is fast and relatively inexpensive, as far as race cars go.

Starting out with an eligible production body shell, and then carrying out substantial modifications to engines, brakes and suspension, has proven popular both with beginners to the sport and more experienced competitors. You are allowed to fit a bigger engine from the same manufacturer as the body shell. It can be a twin cam, or a turbo (with a restrictor), or a bridge or peripheral port in the case of a Mazda, depending on the model. 

You can lower the car to within 100mm of the ground, excluding the exhaust, and can change springs, shocks, sway bars and fit urethane bushes. Wheel rim width is kept relevant to engine capacity. Brakes can be anything you like but must be dual circuit, you can use close ratio gear boxes with a maximum of five, or insome cases six, forward gears, and locker or limited slip diffs are allowed. You are allowed to fit flares to pre-1986 models, front and rear spoilers of limited sizes relevant to the models manufacture date. Improved Production race cars also use a control tyre which is the Yokohama A048R. The variety of cars and the low cost make it a very accessible category, ideal for drivers starting their racing career.


Want an IPRAWA "fact sheet" to download and review? Then click here to download a PDF version.