E85 Questions
Pro
Joined: Sep 2000
Posts: 678
Likes: 310
From: McKinney Texas
I just put 93 or E85 in the tank or any mixture in-between 0-100% and drive. (no calculating or specific ratio mixing at the pump)
I have a lot of other mods, but running on E gets me about 50-60whp over what I make on 93pump alone.
The car is also much more snappy and responsive as well as runs cooler on E85 vs gas.
Team Owner
Joined: Jul 2004
Posts: 28,462
Likes: 3,288
From: Hartford WI
That is pretty cheap. I can't get on a dyno for $400 and that is pretty much strap it down and take it off unless it is self tuning
Thread Starter
Race Director
Joined: Jul 2015
Posts: 16,034
Likes: 2,713
From: Frisco, TX
You will be in good shape, they did my secondary port injection and full flex fuel setup going on 5 years ago and its been issue free since then.
I just put 93 or E85 in the tank or any mixture in-between 0-100% and drive. (no calculating or specific ratio mixing at the pump)
I have a lot of other mods, but running on E gets me about 50-60whp over what I make on 93pump alone.
The car is also much more snappy and responsive as well as runs cooler on E85 vs gas.
I just put 93 or E85 in the tank or any mixture in-between 0-100% and drive. (no calculating or specific ratio mixing at the pump)
I have a lot of other mods, but running on E gets me about 50-60whp over what I make on 93pump alone.
The car is also much more snappy and responsive as well as runs cooler on E85 vs gas.
Safety Car
Joined: Nov 2011
Posts: 3,715
Likes: 343
From: Norman OK
The C7 gas tank is 18.5 gallons, at a 1/4 tank that will be about 4.75 gallons, If the tuner gets it down to 2 gallons and then add 5 gallons of E85 (Will be closer to E70-E75) it will put you are about E50-E55 for when they start tuning.
Safety Car
Joined: Nov 2011
Posts: 3,715
Likes: 343
From: Norman OK
I found a custom PID for the Torque App so I can use it to see what my Ethanol rating is, that and along with a fuel remaining function in torque as well. Once I know that info I can convert everything over to "points" and know how much E85 and gas to add to the tank to keep my rating in the range I need it in. I made a excel spreadsheet that does all of the calculations for me for E85 all the way down to E60 in 5 point increments.
So as an example if I know my ethanol is sitting at E52 and I have a half tank of fuel I take 9.25 (tank is 18.5 gallons) and multiply 9.25 by E52 and it gives me 481 points. Then I figure up how much E85 I am going to add, say 6 gallons in the example and multiply E75 (normal Ethanol content for this time of year for my area) by 6 which is 450 points. I then add the 450+481 and get 931 points. I divide 931 by 18.5 and it gives me a new E85 rating of E50. The 6 gallons of E85 added to the 9.25 gallons remaining means I will need to add 3.25 gallons of 91 or 93 octane. It isnt exact, but it is close enough that I can get within a couple points of where I need to be on my E85 concentration.
Safety Car
Joined: Mar 2004
Posts: 4,048
Likes: 1,476
From: South Florida
I found a custom PID for the Torque App so I can use it to see what my Ethanol rating is, that and along with a fuel remaining function in torque as well. Once I know that info I can convert everything over to "points" and know how much E85 and gas to add to the tank to keep my rating in the range I need it in. I made a excel spreadsheet that does all of the calculations for me for E85 all the way down to E60 in 5 point increments.
So as an example if I know my ethanol is sitting at E52 and I have a half tank of fuel I take 9.25 (tank is 18.5 gallons) and multiply 9.25 by E52 and it gives me 481 points. Then I figure up how much E85 I am going to add, say 6 gallons in the example and multiply E75 (normal Ethanol content for this time of year for my area) by 6 which is 450 points. I then add the 450+481 and get 931 points. I divide 931 by 18.5 and it gives me a new E85 rating of E50. The 6 gallons of E85 added to the 9.25 gallons remaining means I will need to add 3.25 gallons of 91 or 93 octane. It isnt exact, but it is close enough that I can get within a couple points of where I need to be on my E85 concentration.
So as an example if I know my ethanol is sitting at E52 and I have a half tank of fuel I take 9.25 (tank is 18.5 gallons) and multiply 9.25 by E52 and it gives me 481 points. Then I figure up how much E85 I am going to add, say 6 gallons in the example and multiply E75 (normal Ethanol content for this time of year for my area) by 6 which is 450 points. I then add the 450+481 and get 931 points. I divide 931 by 18.5 and it gives me a new E85 rating of E50. The 6 gallons of E85 added to the 9.25 gallons remaining means I will need to add 3.25 gallons of 91 or 93 octane. It isnt exact, but it is close enough that I can get within a couple points of where I need to be on my E85 concentration.
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
Le Mans Master
Joined: Aug 2001
Posts: 6,071
Likes: 297
From: Savannah GA
Cruise-In IV Veteran
You will burn up to 30% more E85 than you will 93 octane so the price difference isn't a bonus. In fact I end up burning more money using E85 and have to fill up more often. Wish more people understood that at the pump I see lots of people filling up with E b/c they think it's cheaper and they are saving money, when in reality they are filling up more often and not saving much of anything. If tuned properly with a wideband you will make more power if you have all the correct dependencies and mods in place, most important being an upgraded fuel system to supply more fuel to compensate for the extra 30% more flow.
Melting Slicks
Joined: Oct 2009
Posts: 2,560
Likes: 485
From: Moberly, Mo
I agree that you do burn more fuel but right now and in the past I've paid over a 1.00 less a gallon for E85 which is usually E65 to E70. I just filled mine up couple days ago and E85 was 2.69 and 91 was 3.79, they don't have 93 where I buy my flex fuel. Mine will get 29 mpg when on full 93 octane and about 23-24 mpg on E85 so there is a difference but the power is there with the E85 that's not there with the 93 octane. The thing about running either is the genius of having the sensor and tuned properly. The sensor sees the content in the line and adjusts the according to the flex fuel timing table set up by the tuner. Now living in the midwest I have to run E30 or lower because of the cold winter climate. However I don't drive my Vette unless its above 40 degrees and of course sunny and generally run all 93 during that time period of about 4 months.
Le Mans Master
Joined: Apr 2001
Posts: 5,475
Likes: 718
From: Black Forest CO
You will burn up to 30% more E85 than you will 93 octane so the price difference isn't a bonus. In fact I end up burning more money using E85 and have to fill up more often. Wish more people understood that at the pump I see lots of people filling up with E b/c they think it's cheaper and they are saving money, when in reality they are filling up more often and not saving much of anything. If tuned properly with a wideband you will make more power if you have all the correct dependencies and mods in place, most important being an upgraded fuel system to supply more fuel to compensate for the extra 30% more flow.
Safety Car
Joined: Nov 2011
Posts: 3,715
Likes: 343
From: Norman OK
You will burn up to 30% more E85 than you will 93 octane so the price difference isn't a bonus. In fact I end up burning more money using E85 and have to fill up more often. Wish more people understood that at the pump I see lots of people filling up with E b/c they think it's cheaper and they are saving money, when in reality they are filling up more often and not saving much of anything. If tuned properly with a wideband you will make more power if you have all the correct dependencies and mods in place, most important being an upgraded fuel system to supply more fuel to compensate for the extra 30% more flow.
This isnt always true. E85 is $2.25 at the pump here in OKC, 91 is $3.75. My fuel mileage is no where near 30% worse either, I get about 17mpg combined on E55 and 20mpg on 91. 10 gallons of 91 @ $3.75 is $37.50 per week for my gas, on E85 I run 7 gallons of E85 @ $2.25 and 3 gallons of 91 @ $3.75 for a cost of $27 or a weekly fuel savings of $10.
You also wont make more power on 91/93 over E85, not even close. 91/93 is octane limited to around 600hp on its own, E85 can go well above that. On E55 I can make 700rwhp, pretty dang close to 100hp more than I can on 91/93. A WB02 has nothing to do with that as a WB02 only confirms your A/F targets and that they are on point.
