Here in Cali we have to contend with 91 only that may already effectively be E10. I calculate my stoic against this. Mixing 50/50 with any grade E10 and pure E85 will be E47. Using non-ethanol gas plus E85 may be less. This may be why your trims are only out 5%. If you need 20% more fuel for E85, E47 would need roughly a 10% bump. (12.2 stoic) But it may be too early in the morning for me for math. I need to take myself to an E85 station and give it a try. The trim skew should tell me what blend I end up with.

 

What I did was fill half of 93 then top off with e85. Now when I go to fill up again I'll have to included the mix in there so for example I am at half tank I'll have to half of 93 then add e. we have a 16.2 gallon tank so let's do the math half tank is 8.1 I'll have to put in 4.05 of 93 and 4.05 of e85.

 

True that. It is the actual ratio of ethanol that matters. I'd like to suggest that since CA has regular gas as *up to* 10% ethanol (and winter blend E85 could be as low as 70%), the actual ethanol ratio can vary depending on the station you go to. Other states have less ethanol in the regular fuel to contend with sometimes. You wouldn't want to be sporting a high timing E47 tune at WOT when not hitting your expected effective octane numbers.

 

I thought going full E85 wasn't that hard for the LNF these days with just HPTuners?

 

From what I understand, it is just a matter of adding 20% more fuel to the same volume of air. - No problem. It is when you start to cram a whole lot of boost in there that the stock system runs out of headroom and may run lean. - Big problem.

 

I ran full E on my LSJ w/ TVS swap, loved it. Really want to do it to the HHR now, but I also enjoy having a stock car that is quiet and drives normal now.

 

this is basically correct but the problem is keeping rail pressure during the torque spike. so with stock fuel system lnfs you actually have to tune around the fuel shortage during the torque spike so things can get a little tricky but yes it can be done

 

^ you beat me to it.

 

Sorry, didn't mean to turn it into a corn thread, but I think E47 is relevant to pushing further into the 12s. Let me rephrase. If people like me, at my skill level, tune for E85, it may run lean at WOT due to the stock pump running close to max. I did not mean it couldn't be done, (I think Trifecta has an E85 tune) but I wouldn't want anyone to get the idea that just pushing the fuel up 20% and going for it would be a good idea. I imagine you'd need to dink with the WG DCC to control the air load over the torque spike and pull a little timing in that area to help keep it cool if it becomes a little lean.

 

yes it will definitely help the quest for better times and more power. the thing about e85 vs. e47 tho is on the stock turbo it has been tested that e47 makes just as much power as e85 because of what was stated in my previous post. the octane effectiveness of e85 over e47 doesn't make any difference on the tiny stock snail at it's power levels....having a much larger turbo and pushing higher psi the actual amount of ethenol will start to yield much more power because of the octane effectiveness and being able to add more timing and increased boost pressures. the difference even between e85 and e98/e100 would be substantial but then again rises the rail pressure problem with the amount of fuel required with that amount of ethenol being used vs regular fuel

/the corn threadjack