E85 guys....
Thread Starter
Drifting
Joined: Apr 2015
Posts: 1,310
Likes: 93
From: Hager City WI
E85 guys....
Hey guys, for those of you running on a flex fuel sensor and stock pumps, are you mixing your ethanol with race fuel? I typically get my E40-E45 mixture with 93 octane but I was just told that it might help to add some 110 octane race fuel. I'm not really sure how that helps since my tune is looking for ethanol content.
Any advice or thoughts. Thanks!
Any advice or thoughts. Thanks!
Safety Car
Joined: Nov 2011
Posts: 3,715
Likes: 343
From: Norman OK
Unless you are knocking on E40 (E85 is 105 octane, E40 is around 98 octane) I would not mix in any other high octane gasoline. As mentioned it will require a retune since it will throw the stoich ratio off.
Instructor
Joined: Feb 2015
Posts: 210
Likes: 65
From: Calabasas, CA
My tune is set to run on anything between 91 pump and E55. I typically run between E45 and E50 by mixing (at the pump) around a 50%/50% mix of 91 pump and E85. Sometimes it's a bit higher than E50 and sometimes a bit lower. Once you get the ratios right in your head, it's easy to calc without much effort.
Thread Starter
Drifting
Joined: Apr 2015
Posts: 1,310
Likes: 93
From: Hager City WI
Originally Posted by Twin_Guns21
My tune is set to run on anything between 91 pump and E55. I typically run between E45 and E50 by mixing (at the pump) around a 50%/50% mix of 91 pump and E85. Sometimes it's a bit higher than E50 and sometimes a bit lower. Once you get the ratios right in your head, it's easy to calc without much effort.
Drifting
Joined: Jul 2015
Posts: 1,681
Likes: 346
From: NY
Similar, I'm tuned for E40, achieve that by mixing 93 pump and C85. I do throw in some race gas on occasion just for peace of mind / "safety" on my track days, only if I have some on hand. Not s show stopper to me by anymeans. 93 + your E85 cocktail is just fine!
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Thread Starter
Drifting
Joined: Apr 2015
Posts: 1,310
Likes: 93
From: Hager City WI
Originally Posted by BooSSted
Similar, I'm tuned for E40, achieve that by mixing 93 pump and C85. I do throw in some race gas on occasion just for peace of mind / "safety" on my track days, only if I have some on hand. Not s show stopper to me by anymeans. 93 + your E85 cocktail is just fine!
Race Director
Joined: Sep 2001
Posts: 14,676
Likes: 751
From: NEwhere Ohio
Hmm. I run it , but have Herko stainless fuel pump hanger, twin rxp 340’s, -8an feed; -6an return lines
a stainless micron mesh fuel filter and big 83? lb/hr fuel injectors that are rated for it
still going thru the stock aluminum rails.
i have an ethanol gage showing me the % in the tank. Though its not hooked to my ecm - just for my own knowledge
no issues with it sitting , and i let it sit over winter with a tank of it.
why i run e85:
i find i can run more boost /timing and it doesnt set off knock retard
a stainless micron mesh fuel filter and big 83? lb/hr fuel injectors that are rated for it
still going thru the stock aluminum rails.
i have an ethanol gage showing me the % in the tank. Though its not hooked to my ecm - just for my own knowledge
no issues with it sitting , and i let it sit over winter with a tank of it.
why i run e85:
i find i can run more boost /timing and it doesnt set off knock retard
Safety Car
Joined: Oct 2007
Posts: 4,222
Likes: 1,078
From: South Florida
Alcohol fuel is superior to race fuel for most applications
The only reason to add some racing-gasoline style fuels is if your injectors or fuel pumps are maxing out and you need the higher energy content per unit volume that gasoline fuels provide
The only reason to add some racing-gasoline style fuels is if your injectors or fuel pumps are maxing out and you need the higher energy content per unit volume that gasoline fuels provide
Le Mans Master
Joined: Oct 2014
Posts: 8,673
Likes: 2,728
From: Atlanta GA