futar Posted June 13, 2008 Share Posted June 13, 2008 I couldn't figure out why my gas mileage dropped a year ago. I recently found that it is probably due to the mandated increase in ethanol in gasoline here in Orygone. Has anyone done any reprogramming of the engine computer to compensate for the ethanol? Quote Link to comment Share on other sites More sharing options...
keitholivier Posted June 13, 2008 Share Posted June 13, 2008 You need a 14:1 compression ratio to make more of the Ethanol. Problem is that if you ever use "normal" gas again you will have disasterous pre-ignition. There is patented IP on using ethanol to control pre-ignition on small, downsized highly turbocharged engines that run close to 14:1 compression ratios. At low power levels, the intake vacuum is relatively high, thus the combustion pressures remain manageable. At higher power levels, when intake resistance decreases, the pressures get high enough to cause pre-ignition. To prevent that, a direct injection injector supplies a critically times small charge of neat ethanol into the combustion chamber which lowers the temperature suficient to prevent pre-ignition. http://www.ethanolboost.com/EBS_Overview.pdf http://www.ethanolboost.com/Literature.htm Quote Link to comment Share on other sites More sharing options...
bufbooth Posted June 16, 2008 Share Posted June 16, 2008 Hello, What is the Alochol percentage in your local Ethanol? Thanks, Dennis... Quote Link to comment Share on other sites More sharing options...
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