Belt fans will speed up, and electric fans will need more juice from the alternator. The faster RPM speeds up the accessories, specifically the water pump and fan. This RPM increase will help burn the rich mixture cooling the combustion chamber. Idle will increases 100-200RPM if the ECT or ACT is over 225☏.

Not to high with A/T transmissions to prevent creep at stoplights. The Throttle Air Bypass will be controlling idle, we need a nice smooth idle. Air is pumped into the converter, but will dump to the atmosphere after several minutes to prevent overheating the converter. We need hot exhaust gasses to help complete combustion and converter operation.

Timing is mildly advanced and will begin to retard after a minute. There will be no EGR operation at these RPM’s. We are now aiming for 14.7:1 A/F ratio for perfect emissions, enrichment will occur only if the ECT is above 225☏. Pro Racer software unlocks your vehicles PCM to tune parameters for optimal performance and drivability, whether youve added simple or high-horsepower modifications. Fuel is now closed loop with HEGO switching. 255☏ is the magic number to start complaining about overheating. Typically the computer is struggling to achieve its target RPM. The computers is programmed with a target RPM for idle, typically it’s around 672RPM. Warm idle occurs if the engine starts and ECT rises above 185☏, we come up to a stoplight, or place it back into neutral. Want to learn how to tune EFI? Start here instantly, and for free.This one tends to be more about emissions. If you want to tune your own car, there is also an option to purchase the SCT Pro Racer package which is linked to a specific vehicle, though double check before purchase that you will have access to all your required tables and maps as this doesn’t give the same functionality as the dealer version. The handheld device also allows you as a customer to change between different maps and tunes for specific tracks or the street with simply a few buttons. Workshops are easily able to tune customers cars via simple data transfers via the cloud allowing customers who live miles away the ability to have their tune dialled in after being driven in real-world driving conditions without the need for the customer to manually pull out their laptop and log or email anything away themselves. While it has been aimed directly at tuning workshops in the past, SCT/Bully Dog tuning software has shifted its sights in recent years and offers a host of new features and advantages previously unavailable.

Pro racer package sct