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Map resolution and integrated fuel table modifiers: Why AUTRONIC you ask?
This is a video made by Ben Strader at EFI-101 showing an engine on a dyno using one rpm and load site in the fuel table. The engine produces the same power an the AF ratios across the rpm range are not too far out. As Ben stated "You can see that when the single cell is used it gets pretty rich in the middle of the RPM band just before VTEC is engaged and then settles out very nicely. I was easily able to get the A/F's flat straight across by offsetting the pulsewidth by simply changing the Target A/F's and allowing them to be mismatched with the actual A/F's" [MRM Racing].
http://www.youtube.com/watch?v=vZQvB0KD5NA&feature=player_embedded
This is a very good example why the Autronic ECU does not need a lot of cells in the fuel table, like other make ECUs. I see many cal files with hundreds of sites and this just makes tuning a long process.
If the engine has stock cams and not supercharged then the values in the fuel table will be almost the same value. This being the case you do not need a lot of sites.
Other make ECUs cannot do this as they do not have a target AF and charge temp table, plus their engine model is not as accurate or they do not have one. [MRM Racing]
I hope it helps some people understand how to tune their ECU's better and more efficiently.I have been experimenting with this setup for some time now, and I can actually get the same results from just about any engine, even turbocharged and supercharged.The key is to use all of the software's ability to maximum advantage, like the Target A/F table, Charge Temp estimation table, and Ignition Modifier Tables to achieve the desired results.In the end, it is not preferable to tune engines this way, but I did it for two main reasons,1} to prove the Autronic's superiority over other systems
2} to be more educated on how the various tables in the software affect its ability to control the engine correctly under all circumstances.If you are tuning an Autronic and using all 512 sites, you might want to take another look at the video and then rethink your tuning strategy!We did not use any of the auto-tune features in the video.The Autronic software works differently than most others out there {including the big name brands}The Autronic software has a very complex modeling software built into the background of the software to actually predict the airflow of your engine based on a few simple parameters you put in during setup.Once the model is complete {which you never see behind the scenes} the software is so powerful that it can run your engine very well with only one single cell in the table.You can, of course have as many cells as you want{up to 512}, but what you find out is that when you are all finished tuning the engine, almost all the cells have the same number or something very close so the table looks very flat in 3D.With all other brands YOU the tuner, must create the "model" of the the engine's airflow by placing bigger or smaller numbers in the base fuel table until your 3D image looks just like the engine's airflow curve.With the Autronics doing the modle for you, the base fuel table is simply used as a way for the tuner to tell the software when the engine's actual airflow doesn't match the model it created. The model is typically very accurate {as evidenced by the fact that most numbers in the base fuel table are the same or very close}How good is it at modeling the engine? Watch the video again. No tricks, no slight-of-hand, just basic math and lots of it.
This video was done with a high compression N/A engine, but the software works just the same even on turbo'd cars!Using the AutoTune feature simply allows you to operate the engine in various RPM and load cells and the ECU modifies the numbers in each cell to tune the engine with no input from the user. Its really cool to watch and its amazing how fast the ECU can tune itself on the dyno, but on the street it might be easier for a good tuner to do it manually since its hard to hold a constant load and RPM.
Good Luck,
Ben
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Fuel Injection Tuning School
http://www.efi101.com
