For my Evo 9, I've found that I can run the same tune for 60-75% ethanol (based on my ECA).

The more pressing issue that I'm having is that as the weather gets cooler and cooler, my E85 tune progressively leans out. When the outside air temp drops below freezing, my AFRs are typically a full point leaner. I have a similar issue with gasoline, but its worse with E85.

 

If you had a way to lower boost by 2-3 psi it probably would make it safe enough again assuming you were not tuned to the razor edge before. From what I've read E85 can be pretty lean in the 12.0-12.5 range assuming the boost isn't in the stratosphere.

 

I've got the car tuned to 12-12.2:1 in normal air temps. I did several WOT blasts in cold weather last winter before I realized that AFRs were at 13-13.2:1. All that happened was that the mixture would fail to ignite and the car would hesitate. Anyhow, I plan to tune out the air temperature effect. Just need to finish up a few maintenance items.

BTW, my point in posting in the Evo 10 forum is that Evo 10 owners who run E85 year-round may want to watch for the same thing.

 

Definitely a good heads up. Are you using any kind of LTFT Disable code so that fuel trims don't effect WOT operation on that setup? I guess tuning back to 11.5 for normal temps and letting it slide to 12.5 should still work on E85 but that 1.0 AFR swing seems quite crazy to accomodate!

 

mrfred do you have an ECA?

When the E85 I get is E79 then my AFRs at WOT are richer than when I get E82. I have the LTFT disabled at WOT.

 

I don't think I've seen anyone else do this, but I put my in-line filter in the tank. I just used a longer piece of submersible fuel line on the exit side on the fuel pump, used the jegs filter with the 3/8" barbs (http://www.jegs.com/i/JEGS/555/15040...oductId=760701), and made sure it got tucked in the tank on the side opposite of the gauge float on the pump carriage. No issues to report. Yes, I realize I just submersed aluminum in alcohol, but it's anodized aluminum.

 

LTFTs are still active, and I saw as much as +10% over the usual LTFTs in cold weather last winter, but the car still went lean at WOT. Its got me wondering whether its cold air reducing the atomization of ethanol. I'm on different injectors this winter, and while I haven't been monitoring AFR, the car is not having the same hesitation that it did last winter with my summer tune. Can't say much more than that until I finish up maintenance and get the car back on the road early next week.

Yep, I've got an ECA. Going richer with lower ethanol content is the expected response and appears to me to be the reason why its possible to run the same tune with 60-75% ethanol.

 

What size and type injectors are you running?

 

Thanks for this write up! Cleared up alot of questions I had!

 

Guys, I am not planing on running E85, but do need the fuel line quick connectors for my russell filter. Where can I buy the quick connectors? I cannot find them.

 

its buried under the fuel line section: http://www.midwayautosupply.com/pm-4...t-800-084.aspx

That gets you a 3/8" barb fitting IIRC. There are others that have a different fitting size on the barb side.

 

same over here great write up

 

Thanks! Ended up buying the filter kit from Blaqops...I should be set for my pump install

 

One thing worth noting is that you should be very cautious on which fuel sock you use. The cotton socks WILL apparently be eaten by the alcohol in E85, and a different sock should be used. I am not sure which kits include what though, so be wary when you get any premade kits, or make your own setup that you do NOT use a cotton sock.

Blaqops uses a plastic one that, as far as I know is used from the older evos, either way it's holding up so far for me. Maybe others can chime in about what they're using?

Here's a link to GSTs finding on the sock:
https://www.evolutionm.net/forums/ev...e85-users.html

 

I'm using an 8/9 sock.