01-17-2018, 06:54 PM | #1 |
Can someone explain E85 to me
Hi all this may be a dumb question but isn’t all gas E85 these days?
All the pumps say 15% ethanol regardless of the octane rating What am I missing? And why do I need a special tune for it? Thanks |
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01-17-2018, 07:03 PM | #2 |
Drives: 2017 1SS 1LE Join Date: Sep 2014
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E85 is 85% ethanol, 15% gasoline
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01-17-2018, 07:09 PM | #3 |
I used to be Dragoneye...
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Most all pump gas has at least 10% Ethanol blended in for both emissions and as an octane booster. Some places might have 15% ethanol, but not around me. E85 is the other way around: 85% Ethanol and 15% gasoline. As a result, it has an extremely high octane rating that, when taken advantage of with a tune, can provide some interesting power results. Most cars are not designed to work with E85, those that are will be labeled FlexFuel, and/or have a yellow filler cap. It will also be branded special at the pump. |
01-17-2018, 07:16 PM | #4 |
Ah ok
I don’t think I’ve ever seen that at the local gas stations... where is it sold I live in Annapolis MD ... is it sold around me? |
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01-17-2018, 07:30 PM | #5 | |
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01-17-2018, 07:52 PM | #6 |
Drives: 2017 2SS black on black on black. Join Date: May 2017
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ethanol has about 2/3 the energy that gasoline does. So to make the same power you need to burn a third more. As such the stocimetric (spelling) ratio for e85 is not 14 to 1, but something like 12(or 11) to one, a significantly richer mixture.
If you are getting 20 MPG on straight gas you will get 16 MPG on E85. Gasoline is not sold by mega joules per kilogram, this is the factor that determines MPG and power (the energy in the fuel). Only the octane rating (ignition temp) is the spec advertised. IMO; E85 is for suckers. |
01-17-2018, 08:05 PM | #7 |
Drives: 2018 ZL1 Join Date: Oct 2011
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I’m in Prince Frederick MD. There aren’t many places around here that sell E-85 unfortunately.
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01-17-2018, 08:36 PM | #8 |
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Before you start burning E85 you may want to make certain you have the correct fuel filter and fuel pump. There are kits available.
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01-17-2018, 11:25 PM | #9 |
i guess it depend on da area
in my place we have - 98 octane - 95 octane - 91 octane the lowest
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01-17-2018, 11:38 PM | #10 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
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6gen Camaro is compatible for E85 without changing any fuel system components. All you need is to add the flex sensor, then turn it on in the ECM, and tune the flex fuel tables. Then you can mix E85 or premium gas and the ECM will adjust the tune accordingly for the E content in the fuel.
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01-18-2018, 01:13 AM | #11 |
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01-18-2018, 03:39 AM | #12 | |
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Quote:
Research Octane Number (RON) - This is what's used in most of the world. The testing is done using a 600rpm variable compression engine. Motor Octane Number (MON) - This isn't used anywhere, not directly anyway. The testing is done using a 900rpm variable compression engine. Then there's what's used in the US (and a few other countries): AKI (Anti-Knock Index) or (R*M)/2. If you take a fuel, and test it using RON and get a rating of 95, and take the same fuel and get a rating of 87 using MON, then you take (95+87)/2 = 91. So when you see 95 octane on your pump, you are most likely actually seeing 95 octane RON. The pump should say RON somewhere on it. Look at it when you fuel your car up next time! Those in the US see the text "(R*M)/2", meaning they use AKI. Even though RON and MON don't have any DIRECT correlation to each other, it's most often like this: 95 RON = 91 (R*M)/2. 98 RON = 93 (R*M)/2. So if a car says it wants 98 octane, then it's always going to be RON, if it says 93, then it will likely be AKI, or (R*M)/2. EDIT: When I say "always", I mean in a stock car. Of course you can have your tuner tune your car for a 98 AKI fuel, but there are no cars that today require that high octane rating out there using AKI, from the factory. // Stefan |
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01-18-2018, 07:16 AM | #13 | |
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2017 CAMARO FIFTY SS CONVERTIBLE
A8 | MRC | NPP | Nav | HUD | GM Performance CAI | Tony Mamo LT1 V2 Ported TB | Kooks 1-7/8” LT Headers | FlexFuel Tune | Thinkware Q800 Pro front and rear dash cam | Charcoal Tint for Taillights and 3rd Brakelight | Orange and Carbon Fiber Bowties | 1LE Wheels in Gunmetal Gray | Carbon Fiber Interior Overlays | Novistretch bra and mirror covers | Tow hitch for bicycle rack | |
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01-18-2018, 07:52 AM | #14 | |
Drives: LSx Powered Join Date: Oct 2009
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Quote:
If you need tuning for the flex fuel give us a shout!! Citgo 2042 West St near old Solomons RD Annapolis Md Shell 811 Bestgate Rd Near Herndon Dr Annapolis Md |
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