Ok, so I have a 2010 SS mostly stock, currently just an intake and a tune. I have HP Tuners but haven't actually done a tune myself yet. I have the 3bar map sensors to go on. Will also be adding a catless downpipe since I have a bad 02 sensor, seems like a good time to do it.

On to the questions, I've been looking at switching to full E85, and have been finding mostly old threads about how to do it from 5th injector (some aren't a big fan) to cam and larger injectors. Also some mention of needing the higher volume fuel pump. I know the 2010 injector seals should be good for E85.

So, what is the current recommended method to convert? Not really interested in the E47 as hopefully I can find consistent E85. I plan on sticking with the stock turbo and I DD the car.

 

If you dd the car I would highly recommend e47 as you will burn through a ton of e85. E85 consumes 33% more than straight premium. E47 only 13%. On a stock turbo there are negligible gains on full e verses e47. That said, using a boost ramp, most have been able to run full e on a stock turbo. On e47 there is no issue and your injector seals should be ok.

 

Yeah full E on the LNF is difficult at lower altitudes, the fuel pump just cant deliver enough fuel. Your best bet is to either do E47.

 

So do most people just use the 10 dollar E85 testers and calculate the mix when filling up then?

 

Most do, and some fill up 5gal tanks and test at home. You can also go to Science and Surplus and grab a glass 100ml graduated cylinder for $6 and achieve the same thing as the $10-20 "E85" tester.

 

Also with continuously changing E percentages in fuel you can tweak the mix as needed with E47. If you get a tank of 60% E and your tune is for 85% theres not anything you can do about it.

 

I mix about 3 -5 gallon gas cans at a time. First I test the e content, then use a calculator on a websight on my phone to know how many gallons of supreme to add. My e stations don't carry supreme so I have to go to 2 stations.

 

That's really what I'm trying to avoid on a DD

 

yeah its kind of a PITA, one of the major reasons I stopped using E. didnt want to mix.

 

Everyone is so over **** on ethanol content, anything over about e30 nets limited timing gain on an LNF/LDK. So sit at 22* and watch your fuel trims after tuning on a tested e47 (have the maf dialed in on pump first). Shifts in LTFT can be directly related to ethanol content. Hell I ran almost a year on e47 without testing, and even used unleaded not premium and have 0* KR when running 22* of timing on 23psi (25psi here in CO), just did a back calc based on fuel range and mpg less the total tank volume and put equal amounts of e85 and gas.

 

^ says the chemist

 

Little fluctuations doesnt make a huge difference and the LNF has a wideband that can make adjustments for the change in fuel based on commanded vs actual.

 

I know. im giving you ****.

 

this is what i did lol. my tuner and i dialed in the 93 tune and then made changes for e85. i think my tune is only at 21-22* at 22psi for e47, its nothing crazy, it just saves me some time and i dont have to sit there for 15 min holding up a pump to get e85 lol.