28-01-2014, 11:03 AM
Hmm, think people are getting confused :/
In a Petrol airflow is calculated with a VE table with regards to MAP vs TPS, their airflow rate is variable with throttle - it's a completely different management principle - diesels don't require a VE table since they aren't throttled by airflow.
EDC15 calculates the amount of fuel to be given with the "smoke" map - a coversion table to dictate how much fuel can be injected at a given airflow rate vs RPM - i.e. so you don't floor it and jam in 120hps worth of fuel at 1100rpm with of boost, it's going to smoke like a motherfucker. When you go to MAP based tuning, you literally swap this map to rather than being based upon airflow rate (from the airflow meter) you change it to be based upon manifold pressure. Some EDC15s have both however, a MAP and a MAF sensor for different situations.
It's all down to accuracy, the HDi90 in stock trim really doesn't need much other than a MAF sensor, it's a pretty simple engine that doesn't require that much boost, it's also run at a pretty lean AFR most of the time to prevent smoke. For better control, airflow meters ARE better, it's just that they go wrong more often and can be a pain to map.
In a Petrol airflow is calculated with a VE table with regards to MAP vs TPS, their airflow rate is variable with throttle - it's a completely different management principle - diesels don't require a VE table since they aren't throttled by airflow.
EDC15 calculates the amount of fuel to be given with the "smoke" map - a coversion table to dictate how much fuel can be injected at a given airflow rate vs RPM - i.e. so you don't floor it and jam in 120hps worth of fuel at 1100rpm with of boost, it's going to smoke like a motherfucker. When you go to MAP based tuning, you literally swap this map to rather than being based upon airflow rate (from the airflow meter) you change it to be based upon manifold pressure. Some EDC15s have both however, a MAP and a MAF sensor for different situations.
It's all down to accuracy, the HDi90 in stock trim really doesn't need much other than a MAF sensor, it's a pretty simple engine that doesn't require that much boost, it's also run at a pretty lean AFR most of the time to prevent smoke. For better control, airflow meters ARE better, it's just that they go wrong more often and can be a pain to map.
