first post. im interested in this car. waiting to see one in person. have a 2.0 2003 WRX tuned using access port and access tuner race by me to produce 300 hp at the wheels on e85. it has less energy than gasoline at the same volume but higher octane, around 105 and it cools the motor so its anti-knock effect is greater than its octane improvement. on my car (and similar) you need larger injectors and a bigger fuel pump. i run a slightly bigger turbo, a slightly bigger intercooler and a turbo back cobb exhaust. you need a wideband o2 sensor also.you simply deliver more fuel to the car to produce the power. btw, stock new my car had 225 hp at the crank. estimates for the at-the-crank hp for my wrx are around 350 to 390 hp. the motor itself has not been touched and this is considered a moderate level of tune on this car. my guess is the fiesta st will be good for a minimum of 300hp at the crank with supporting mods (replacement of exhaust, perhaps a bigger turbo, intercooler and perhaps bigger injectors/fuel pump).I read about E85 in a 3.5 Ecoboost. It had huge torque but it ran out of steam before 4,000 rpm I think with less HP than gas. I think the lower specific energy of the fuel combined with the limits of the stock fuel pump is what spoiled the power.
If there is ever an Ecoboost with an oversized fuel pump it might work well.
i doubt you will see e85 tunes off the shelf from cobb. not sure if they would consider doing one if it was tuned in one of their shops. the subaru e85 movement started with individuals experimenting. by the time i did it there was a ton of 'how-to's on the net. for my car it meant making sure the stoic oxygen to fuel was the same as gas. this was done with an aftermarket wideband logging along with the access port software (access tuner race). on my car you fooled the ecu by making it think the injectors were smaller which made them pulse longer to maintain the correct stoic.Since race gas is a pain to get, I have thought long and hard about E85. Oddly, I have a few closer pump options for E85. My 91 octane map is happy, but I need to run 100 octane to get great results on the more aggressive 93 octane map (sure to change with the upcoming update!). I ran into a number of Subaru guys doing this over at Sean Church's shop, but as already pointed out, this is a very different application here.
I ran this past some of my very accomplished tuner friends, and it appears this isn't the best idea for our particular application. It's early yet, who knows? The direct injection Mazda guys have enjoyed success with a mix of E85 and 91 octane, up to 50%. More than that, and they started to see problems with fouling up hardware.
Tim's comments encourage me that we'd be better off with our "rated hardware", but then I think about the other practical issues. I suppose we could convince Cobb to make a program for E85. I'm worried about it, but I'd be willing to try it. I'm game to try a 50/50 mix.
Has anyone else looked into this recently? This is also a good project for the good people at FSWERKS -- when they dig their way out of their Focus ST projects!
folks are taking the GTR, upgrading its 3.8 twin turbo motor, running e85 and getting in excess of 1000hp out of a streetable car that has performance equal to a bugatti veyron except for top end.We made 801whp @36psi on a 2.5L, using E85 (2000cc port injection). Way more power than we could with 93. I love the stuff. And E100