(Accel and Decel are used for TPS Driven AE, and Bit7/Bit8 are for MAP Driven AE). If Decel or Bit 8 are active, that’s a Decel event and AE is pulling fuel if configured to do so. If either Accel or Bit 7 are active, that’s a Accel event and AE is adding fuel. Lastly, near the bottom right corner of MegaLogViewer you’ll see four indicators. Additionally, monitoring injector pulsewidth (select PW in the log to view that data) is helpful too, as you’ll be able to see the commanded injector pulsewidth including the extra fuel added duing an AE event. You can set another to TPS to show you what throttle position you were at as well. In MegaLogViewer, on the left using the drop-down boxes that let you select what data you are viewing in your logs, set one of these to TPSdot, and/or MAPdot. Then you can stop the datalogging and load this log up into MegaLogViewer. Two to three pulls is better than one, but there’s no need to get carried away. You’ll need to have a safe way to accelerate from the bottom to the top of a gear, preferably your 1:1 ratio gear, and you’ll want to datalog your engine idling, as well as these WOT pulls with your MegaSquirt EMS and TunerStudio. I prefer a little method to my madness ).
Accel fuel injection for harley trial#
Getting this dialed in can be done methodically, or by trial and error.
MAPdot is measured in kPa/second, and TPSdot is measures in TPS %/second. Faster movements will have a higher number reading. Slow movements of the throttle will have a low TPSdot or MAPdot reading. Tagging ‘dot’ on the end of these indicates what you’re measuring is not how big of a change is made in throttle position or manifold pressure, but rather you’re measuring the rate of that change. MAP stands for Manifold Absolute Pressure. Basically you want it as low as you can get it without it causing AE to trigger when it’s not supposed to, ie during steady throttle.įirst off it helps to understand exactly what TPSdot and MAPdot are.
Setting it too high can mean the AE won’t kick in when you need it. Your goal is to set these high enough that the acceleration enrichment won’t accidentally trigger at steady throttle, but low enough that it’s sensitive enough to catch small/slow throttle movements as well. These are the minimum amount of change of TPS position or MAP pressure reading, respectively, that are needed to trigger acceleration enrichment. Below the line graph charts, you’ll see a TPSdot threshold and a MAPdot threshold. To access the Basic Acceleration Enrichment settings in TunerStudio, click the ‘Accel Enrich’ button at the top of the screen, and select ‘Acceleration Wizard’. Setting the TPSdot/MAPdot Threshold Levelsįirst up– you need to determine what your TPSdot or MAPdot threshold will need to be. Typically the other settings in the bottom left area don’t need to be messed with too much, though I have sometimes found an Accel Time of. MAP based AE does the trick if you’re running an engine without a usable TPS, but TPS based AE is generally easy to tune to the proper sensitivity level such that it activates when you want it to, and not when you don’t.
If you have a variable Throttle Position Sensor, we’d recommend 100% TPS based AE. Slow ‘tip-in’ can be adjusted with a certain PW adder, medium with another larger PW shot, mid-fast with another size PW squirt, and very fast throttle movements with another. If your background is tuning carburetors, you can think of this as a very powerful fully adjustable/tunable accelerator pump that lets you compensate for more than one rate of throttle position change. The goal is to compensate for this influx of air for an instant during that transient until the the transient is over and the VE tables are again providing the proper amount of fueling. The standard AE under the Acceleration Wizard can be thought of like the accelerator pump on a carb, which shoots in some extra fuel when you suddenly hit the throttle to compensate for the massive influx of air when you open the throttle blades. AE Tuning Basics – What is acceleration enrichment? Since the acceleration enrichment is stacked on top of the fuel the ECU is commanding based on the VE table, you’ll want to tune AE last, after you’ve got the solid foundation of a well tuned VE table under you. Adding a correctly tuned amount of acceleration enrichment to an incorrectly tuned fuel table is still going to result in an incorrect amount of fuel. Before you start tuning the acceleration enrichment, make sure your VE tables are dialed in.
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