The ECU has a few sequences how to start the engine. An engine requires an initial prime pulse of fuel to start the moment the engine is cranked, then a richer mixture during cranking. Once it started, it also requires a certain amount of richer mixture than idling to get […]
Launch Control
· The Launch Control feature will spin a turbo to higher RPM’s while the vehicle is stationary. This is done by adjusting the RPM limiter, enrich the fuel mixture and retard the ignition timing. This will create boost pressure so that when the driver launches, there will be no turbo […]
Crank and Cam angle Sensors
These inputs are required by the ECU to determine exact crank and cams angles so that spark and injection timing can be calculated. Crank (TDC) The crank angle sensor is used by the ECU to determine exact crank degrees as it rotates. This sensor could be situated on the crank […]
Settings before Tuning
When you get to this point your engine should start and idle easily and the basic settings in the startup procedure should be set. Start with a warm engine at working temperature. Remembering you have a start-up map loaded from a running vehicle. All the sensors such as TPS, MAP […]
Transmission retard
This feature is for automatic transmissions to retard the engine timing during gear shift. This will make the shift smoother and protect the transmission. The launch control circuit will be used and this system will disable launch control. Set the tuning POT on. Set the POT on Retard. Set the […]
Tuning Basics
Tuning is all about getting fuel and fuel amount, spark and spark timing timing correct under all conditions. Understanding how the ECU works with these values is important to adjust them correctly. The Spitronics ECU’s are designed to be easy and user friendly and will do many calculations in the […]
Tuning POT Timing
Timing will advance or retard the ignition timing by 5 degrees in this example. The POT needs to be in the middle to have no effect on current timing. It is useful in racing for tuning time while driving. Ensure that the driver has a knock sensor and light fitted […]
Tuning POT Injector
Injector setting will change the injector time with 10% richer or leaner in this example. The POT needs to be in the middle to have no effect on current fueling. This is handy in a race car if the driver has an A/F Ratio gauge installed. Then he can manipulate […]
Tuning POT
This POT is a Potentiometer or variable resistor that lets the tuner or driver change settings in real time while the ECU is operating. It is a device that connects to the communication port plug for on one of the universal I/O. Note that other features will be sacrificed when […]
Charge volts tuning
Battery and alternator voltage have a great influence on ECU systems. When an engine cranks, battery voltage can fall as far as 9 volts on cold days and when the engine is running, voltage can go up to 14.3 volts. This difference has a big influence in coil energy and […]