The 2,400 kg/hr meter is targeted at cars in the 450-680 rwhp range, while the 2,700 kg/hr meter is intended for those producing between 650 and 800 ponies at the tires. Those numbers indicate the airflow at which the meter is "pegged," or registers the maximum of just under 5 volts readable by EEC processors. So, to speed tuning high-horsepower applications, SCT decided to commission meters manufactured and calibrated by Hitachi (which, to our knowledge, still makes all of Ford's factory meters) in two known, repeatable calibrations-one for up to 2,400 kilograms per hour of airflow and the second for up to 2,700 kg/hr. Since the car's processor uses this air-mass data to calculate engine load-or volumetric efficiency-and determine the required fuel and spark response, the accuracy of the meter's transfer function couldn't be any more critical. In short, the transfer function is the meter's means of telling the processor how much air is being ingested at any time, by precisely equating a given mass of incoming air to a given meter output voltage. Without doubt, a mass air meter's transfer function is one the most important keys to getting a vehicle to run right at any modification level and in any weather condition. Last, but by no means least, SCT has added a pair of precisely calibrated, high-flow mass air meters to its tuner-available hardware list.
Super chip tuning code#
It also offers a number of user-adjustable parameters, including timing and fuel tables, gear-ratio calibration (for '99-and-newer cars), and it acts as an OBD-II code reader and eraser. Ideally, we suppose, you go to your local SCT tuner, have the three custom tunes worked out on the dyno (say one each for regular, premium, and race fuel), and then buy the Extreme Flash Tuner with those spare tunes loaded. Think of this as sort of a handheld switch-chip, in that it can hold up to three custom programs that you can flash through the OBD-II port as desired.
Unless, that is, you acquire one of SCT's Extreme Flash Tuners. So if, for instance, you have your blown ride tuned right on the edge for 93-octane fuel, and you find yourself in California where they serve only that 91-octane mineral water, you'll have to go easy to avoid detonation. Engine chip tuning is a process where the electronic control unit is reprogrammed, making the engine work within different parameters. One of the problems in owning a Mustang that needs to be flashed is that, unlike those that can take SCT's four-bank chips-which are capable of being programmed with up to four switchable custom tunes, an off mode that defaults to your stock calibration, as well as an antitheft mode-there's no way to flash more than one program at a time into the EEC.