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Rongineer E30 M3 Airbox kit
We can thank Robert Bosch for developing electronically controlled engine fuel injection systems which opened the way for engines to meet emissions and fuel economy mandates. The development of the oxygen sensor feedback system was a major improvement, and finally the development of the three way catalytic converter system was the "coupe de grace". Later OBD II systems are a further refinement of this basic system. Fortunately for enthusiasts of interesting older vehicles, the early systems are relatively simple and amenable for improvement using later technology. The original BMW M3 (the "Real M3" to some enthusiasts) is an example of an early Bosch Motronic engine control system. One of the areas offering improvement is replacing the old style Bosch "barn door" airflow meter (AFM) with a later less restrictive airflow meter such as a mass airflow sensor (MAF). However, on my M3 I installed an alpha-N (AN) type control system that doesn't use any airflow measuring device. The AN system determines engine load from a combination of the throttle angle (alpha) and engine speed (N=rpm). The system electronics receives these inputs and sends a calculated "load" signal to the engine computer. The map of throttle angle and engine speed operating points is is adjustable at each point for fuel delivery. By utilizing a wideband oxygen sensor which measures the air-fuel ratio operating condition of the engine, the fuel mixture across the load spectrum can be tuned for proper running. After tuning, the original oxygen sensor is connected to restore the system feedback loop. Because the original engine ECU is used, all of the cold starting, acceleration and other compensations of the original system are still operational. This systems works quite well and results in an improvement in power and a great improvement in driveability. Emission performance is maintained. However, on the M3, deleting the AFM requires restoring the air path from the air cleaner to the air plenum on the engine. To accomplish this Ron developed a special upper airbox. It uses the mounting flange portion of the original box so that the new airbox can be re-mounted to the lower airbox. In this way the original cold air intake system is maintained and the original air filter element can be used. A larger, less restrictive hose connects the airbox to the plenum. A bung in the side of the airbox for an intake air temperature sensor completes the transformation. This provides excellent power gains as proven when installed on a 27,000 km Evo2 in the UK recently and also gives more flexibility on mapping etc.. The RONGINEER M3 Airbox Kit is an economical solution to improving performance by optimizing the air path to the engine when replacing the original restrictive airflow meter. It is compatible with popular engine management systems like the MAXX AN piggyback control and the Unichip Q. Enthusiasts who have installed the airbox kit have reported improved power on dyno tests. The airbox is simple to install and has an "OEM" look. The original cold air intake system is retained and the original air filter element is used. The airbox and included hose provides an improved air path to the engine plenum. A bung is provided for an intake air temperature sensor on the cool side of the airbox without interfering with the barometric sensor. • The installed airbox kit has an "OEM" look. • The new airbox is a lightweight fiberglass molding finished in high temperature black wrinkle paint. • The airbox mounting bracket uses the original mount in the car. • The kit hose improves airflow by providing a larger constant diameter air path to the plenum. • The bung provided for an intake air temperature sensor does not interfere with the OEM barometric sensor. • The kit can be installed in about an hour. • The complete kit includes all of the parts necessary to make the installation, including installation instructions. • For purchase information contact Neil McDonald at Automac Ltd, 00844 288 6622 or info@automac.co.uk. Extra fitting parts required dependent on whether go for Dastek or Alpha N setups - we can direct to experts for fitting locally
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info@automac.co.uk |
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