What are the risks of changing the air/fuel mixture by changing jets or metering rods?
You can very quickly damage or destroy your engine by running too lean, too little octane and/or too much ignition advance. Major damage can occur in just a few seconds under full boost. What is the best method to optimize mixture? The best method is to use a chassis dynamometer to load the engine while analyzing the exhaust with an exhaust gas analyzer. These machines are fairly rare and quite expensive to operate. The best method for the hobbyist is to use an oxygen sensor mounted on the exhaust pipe and Air/fuel Ratio gauge to determine mixture under load in use. Oxygen (also called Lambda) sensors are used on most current fuel injected engines and are available at reasonable prices. Suitable electronic gauges are available from a number of aftermarket vendors. We have had good success using Innovate Motorsports products. A threaded bung for the sensor must be welded to the exhaust pipe. It can be blocked with a plug when not in use. The gauge can also be mounted temporarily and rem
