MAF Scaling and Aftermarket Intakes Technical Support
The MAF (Mass Airflow Sensor) is an integral part of the engine control system. Measured Air Flow has a direct effect on the fuelling, both stock and Revo calibration are specific to (unless otherwise specified) a standard scaled MAF sensor housing.
There are mainy aftermarket intakes available but not all of them have correct MAF housing scaling, its not just the cheaper unbranded intakes that have this issue many big branded intakes are not scaled correctly.
The ECU will adjust using corrective factors up to a certain point, typically shown by seeing high fuel trim figures. However an incorrectly scaled MAF housing can cause unstable idling, hesitation, misfiring and erratic power delivery to name but a few symptoms.
When building a Stage2 or higher stage vehicle it's important to use quality parts that have been tried and tested to prevent seeing the above issues.
Note: The above issues can be seen on a poorly functioning MAF sensor in a correctly scaled housing.