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However, this also makes it the “red-headed stepchild” of GM ECMs, as it is known amongst tuners. The E40s are essentially a hybrid, a testing ground for GM to start experimenting with features and controls that would eventually become the GEN 4 computer. With this module came a glimpse of the future and what was to come from GM as they headed towards GEN 4 computers. This makes the Pontiac GTO one of the most prime examples for this computer. E40s are strictly found in 20 LS powered cars. The last hoorah for the GEN 3 computers is the E40 control module. This attribute is desirable to performance enthusiasts with the increasing popularity of E85 as a race fuel alternative. The computer can then seamlessly change the fuel output and spark advance on the fly to instantly compensate for a change in Ethanol content. Flex Fuel gives the computer the ability to determine the Ethanol content in the fuel via a sensor placed in the fuel line supplying the engine. While P59 computers closely mirror their P01 cousins, something interesting to note is that they are one of GM's first Flex Fuel capable ECMs. These modules first originated in trucks and SUVs, but you will also find them in 2003 to 2005 Corvettes, as well as 2004 GTOs. The next GEN 3 module to be released was the P59 control module. It will require the re-pinning of a few wires in the harness, but that is something done with relative ease. One joke that’s prevalent among experienced tuners is that “if you are going to tune a '97 or '98, then you better have a pile of spare computers sitting on the workbench.” For these reasons, we recommend upgrading to a 0411 if you are going to be adding performance modifications to a '97 to '00 LS powered vehicle.
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The 0411s are also much more robust than their "fragile" 1997-2000 predecessors which are easy to damage while writing tune files to them, rendering them permanently damaged. These modules are the more desirable versions of the preceding P01 due to a processor upgrade performed by GM. This specifically references the P01 computers from 2001 to 2003. The first in the line was the P01, which was used through about 2003, with the best models denoted as an 0411, usually pronounced, oh-four-eleven. It controlled LS1, LS6, LS2 engines and more and it was used in a variety of trucks, SUVs and cars as well. The GEN 3 ECMs controlled many GM LS Engines from 1997 until approximately 2006 (model depending). 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.
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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).
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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.