APPLYING WHAT WE'VE LEARNED
After a few sleepless nights, Injen engineers started considering incorporating a venturi type tube along the path of an intake tract to control the flow rate to the mass air flow sensor. By learning how to control air speed and resultant pressure, Injen engineers were able to maintain the desired temperature of the “hot wire” located inside the mass air flow sensor without the use of external electronics! In doing so, Injen now had the method to tune the air/fuel ratio for optimum power built directly into the Injen intake system.
Along with controlling the air/fuel ratio, Injen also needed a way to control short term and long term fuel trim levels. Short term fuel trim levels refer to adjustments being made in response to temporary conditions. Long Term fuel trim levels compensate for issues the presents itself over a longer time period. Fuel trims are expressed in percentages and can be monitored by accessing the ECM through the OBD II data port. A positive value indicates lean conditions (add fuel) and negative values indicate rich conditions (subtract fuel). Evaluating this data during the R&D process allows our technicians to properly fit and tune Injen’s Air Fusion device if needed.
With all of this research compiled by the end of 2004, Injen began an aggressive restructuring program that would involve a total overhaul of the R&D and production departments. The engineering department began redesigning air filters, couplers, step hoses, and incorporated larger bend tools and forming equipment that would allow us to build a “tuned” intake with the least amount of air resistance for maximum horsepower and torque gains. Today, all Injen filters, molded couplers, and elbows are equipped with built-in velocity stacks. In addition, mandrel bent tubes are bent with larger radiuses for streamlined airflow and intakes are fitted with the correct tube size to minimize the amount of air restriction and maximize engine efficiency.
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