![]() The changes made are using the HP Tuners Virtual Volumetric Efficiency Table Editor, which makes your job much easier by graphically displaying the table as you see it - instead of as coefficients, which are much harder to work with for the typical tuner. Below is an example of a GEN 4 VVE Table, represented using air in grams/sec/sec, temperature corrected to Kelvin, as well as multiple camshaft angles. ![]() ![]() This is a much more robust system which was required when the engines evolved to include features such as variable camshaft controls. This really means that the computer takes real inputs like RPM and MAP, but then based on other inputs such as camshaft position and manifold runner position, it calculates a value. The GM GEN 4 VE Table moved to Virtual (VVE) table instead, which uses a series of coefficients to predict VVE.The computer uses this information to calculate the correct amount of fuel required. The VE values in the table represent a ratio of how full (of air) the cylinders are, compared to their theoretical maximum. ![]() The GEN 3 VE Table was a traditional table based on RPM and MAP.It models the airflow for the computer to calculate fuel. A ‘VE Table’ is one of two methods used to control fuel delivery, typically the secondary method with the primary being a MAF (Mass Airflow Sensor). One of the primary differences between the GM GEN 3 and 4 ECMs are how they estimate airflow using VE Tables. This article will focus on helping you understand the differences, strengths and weaknesses of these computers, so if you want to get better educated on these computers, read on! ![]() Because of this, we group these ECMs into three primary generations, the GEN III, IV and V. The challenge every good tuner has - and one we constantly work to overcome when teaching our students how to tune, is the variety of changes that these ECMs have experienced over the years. Odds are you already knew this, but I’m betting you don’t know as much about the ECMs that powered these legendary engines from the original LS1 powering the 1997 C5 Corvette to the modern day Z06, they’re all great engines, but nothing without a great ECM to control them. Everybody loves the GM LS Platform but as much as we hate to say it, the LS is dead… and in its place lives the LT Platform. ![]()
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