![]() ![]() ![]() While easily understood once studied, ethanol and alcohol-based fuels introduce a variety of benefits and downsides these must be accounted for both during the calibration process and during subsequent operation of the vehicle. If you have limited experience related to the math and science behind variable ethanol content and E85 tuning, we highly recommend some background education before utilizing the COBB Custom Features, especially the Flex Fuel feature and functionality. The blending of these tables is not required for vehicle operation and is determined by the tuning strategy employed. For example, Target Boost and Ignition timing changes may be locked above E70 as diminishing returns to the knock threshold are usually observed above 70% ethanol content. These items can be scaled with ethanol content but do not necessarily require a 1:1 relationship with ethanol content. The need for this flexibility is based on the notion that things like effective octane rating will significantly increase as ethanol content increases. This allows the tuner to account for variable fuel quality as ethanol content changes. Account for changes to fuel quality (octane, burn rate, EGT, etc.).Correct tuning and blending of these tables is required for the vehicle to operate under variable ethanol content. Tuning parameters like Injector Scalar and Cranking Enrichment will fall under this category. This is all based on a linear relationship and somewhat easy to calculate scaling for these items generally requires a 1:1 relationship with the ethanol content delta. This allows for the ECU to account for the variable amount of fuel required to achieve a correct air/fuel ratio as ethanol content changes. Account for changes to ethanol content (stoichiometric ratio).In general, there are two primary goals of a full-function Flex Fuel implementation: OEM-level functionality and finish: adjustable ethanol content signal sampling rate, smoothing factor, deadband, DTC detection, etc.All main tuning functions covered by Flex Fuel options: the full and variable blending of AVCS, Boost Control, Injector Scaling, Open Loop Fueling, Ignition Timing, Cranking Enrichment, Warm-up Enrichment, Fuel Mileage Display Correction (non-DIT), injection timing (DIT only), etc.Utilizes analog ECU inputs for ethanol content via tuner selection between the existing TGV (Left), TGV (Right) and Rear O2 Sensor analog 0-5v inputs.Seamless switching of fuels between low ethanol fuel and high ethanol fuel.I'd like to hear your guys/gals thoughts on what you would run and why."Flex Fuel" (FF) functionality is supported for select turbocharged Subarus utilizing the COBB Custom Features ECU. In short, COBB's Flex Fuel feature encompasses these custom code features: ECU Masters EMU Black, FuelTech FT450, AEM Infinity 506, or if I can find on for a good price a link g4+ plug and play unit. I have been thinking of the following platforms for it. I am kind of stuck on what to offer the customer. Side note I have a very nicely built 08 WRX STi in my workshop that is in need of a comprehensive standalone option. I tune a wide assortment of vehicles however the platforms I need help with are basically all of the supported manufacturers COBB supports. Any help with alternative platforms would be greatly appreciated. As far as HP-Tuners, well the cost of coins is kind of annoying. But SCT is doing the same as COBB and EcuTEK charges obscene amounts for their tuning suites. ![]() So, I have reached out to EcuTEK, HP-Tuners, and SCT. I also live in a state that doesn't have emission regulations anyways. Most of my customers cars are dedicated track cars that aren't road legal as it is. Forcing us to follow the EPA regulations for "Emissions compliance". As most of you are aware COBB decided unilaterally to basically tell us tuners on how to do our jobs. I am in need of options for my customers that have the COBB Access Port. ![]()
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