Opposite_Lock Posted 8, July 2011 Report Share Posted 8, July 2011 As some of you may/may not know, e85 is currently the new magic potion in the automotive world at the moment. For those wondering what all the fanfare is about, e85 is a 85% blend of ethanol and 15% regular gasoline (generally a 98 ocatane). As an alcohol, ethanol is similar in that its made from foodstocks like corn and sugar cane, fermented then distilled (i dont know the full process, but thats the jist of it) into a cleaner burning and renewable fuel. What really makes me happy in the pants though are the power advantages. Although blends will vary depending on season, the average octane rating of e85 is 105 with a "good blend" getting around 108 to 110 Apart from the obvious power advantages from running e85, its cheaper to produce, meaning cheaper at the tank and less emissions. Win win win. The drawbacks? as e85 has less energy content per unit than gasoline (something like 20%, but dont quote me) so while its cheaper, youll need more of it to get the same mileage. So enough with my informative ranting and raving, would you run it in a renaultsport? Theres been much talk that e85 corrosive but the general consensus is that in modern cars, it isnt. Some people who have converted to e85 run teflon fuel lines as a precautionary measure but many have run it for years in modern cars without any problem. As e85 has less energy content that i mentioned earlier, injectors are the first bits that need to be upgraded as the engine will be starved of fuel, run lean and lunch itself if theyre maxed out. The fuel filter will also need a replacement. These are pretty much the only things that need to be changed hardware wise, but the real gains (and how well the engine runs) depends on the tune. Basically, there are two such set-ups, one where your engine is mapped specifically to run e85 (simplest) and one where you can have a full flexi fuel car that will run on both a full 98 fuel and e85, where via a ethanol content analyzer the ecu will adjust the AFM in accordance to the ratio of e85:pump 98. This setup however requires a little more equipment and expertise. A lot of people are seeing some real gains from e85, with a flex fuel setup on a skyline gtr on skylines aus forums netting a 40RWKW gain. The engine was heavily modified to begin with but shows the gains made just from changing premium to e85. Several hondas on ozhonda have made 10-15rwkw gains on e85 which is quite a gain for an NA 4. Again though, what kind of gains you get will be dictated by the tune. As far as i know, nobody has attempted it in a renaultsport, and i wonder if henk could work his magic in regards to tuning. I also wonder what the gains would be in an RSC or even more so, in an f4rt. Cheers -Sam Quote Link to comment Share on other sites More sharing options...
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