with using Manifold Pressure as the load axis of the VE table which is fine. Probably not a bunch of help but a free bump if nothing else. Volumetric Efficiency or VE is a measure of the actual amount of air that is. The easiest way would be to capture data directly from the stock MAF and use the calcs in that link above. I calculated up a bunch of other stuff but been interrupted too much this morning and not sure how accurate it is. You can also use your HP Tuners interface as a diagnostic tool to. Modify a massive range of defined parameters to create a custom tune, write it to your vehicle in just seconds, and start data logging. in the summer of 2019 for the 2020 model-year. TAF = 285.87 Ft³ (theoretica air flow from displacement) HP Tuners’ VCM Suite tuning software, made up of VCM Scanner and VCM Editor, offers access and programming capabilities for our Subaru lineup. Subaru introduced a facelifted version of the Impreza's fifth generation in Japan and then in the U.S. SD (speed density) is essentially a way of measuring the air coming into the engine sans MAF. They are not the same as the older VE tables in previous computers, but more of an abstraction to calculate data for the SD coefficient tables. The engine’s Volumetric Efficiency map is used in an engine control unit to calibrate how much fuel to deliver to the engine. The VVE tables (Virtual Volumetric Efficiency) are interesting. Some things that might help kickstart your calculations if you don't have them already. Volumetric Efficiency or VE is a measure of the actual amount of air that is moved through an engine vs the engine’s cubic capacity. I'm sure a dozen other variables that I haven't even come across. You'd have to take into account pressure drops from IC, turbo efficiency (from a compressor map, incidently I don't know of one for Suby turbos), engine's naturally aspirated VE (probably ~80%), boost pressure, atmospheric pressure, temperatures, IC efficiency etc. To actually calculate it from scratch without the data would require a lot of calculating I believe. I don't yet have scanning software to help determine the actual volumetric flow rate on the Suby yet (use datamaster for my T/A). In the MS code, the fuel delivered at the injectors is equal to 'Required Fuel' VE Table Value Enrichment corrections. If everything was setup correctly, it could be that a value of 100 actually represented 100 volumetric efficiency. I put 'VE table' in quotes because it ends up being, as you put it earlier, a convolution of volumetric efficiency and any nonlinearities that might be present in your fueling system. Improving VE table resolution The numbers in the VE table are sort of arbitrary. Make sure your 2.24 and 2.25 are both up to date. With a speed density ROM, the 'VE table' can easily address fueling quirks in different RPM/Load regions, without the same kinds of side effects described above. Will get you very close with MAF still in the picture. Click to expand.Hmm, let me just offer this up. This one uses GM Volumetric Efficiency to 'create' the VE table.
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