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  #25  
Old 07-19-2014, 10:22 AM
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Re: My Experience with E85 and V6

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Originally Posted by MDBones View Post
Sorry, but until you can show me that E85 produces those HP increases on any Jeep engine without mods or tuning I won't believe it.

I know several people who tow and haul with Ford, Chevy and Ram gas trucks who've tried using E85 and they've all told me that there is a noticeable loss of felt power along with poorer fuel economy. Not a one of them said they'd ever burn it again... even when not towing.
It's not rocket science. Just compare the calorific values:
Gasoline 47.3 MJ/kg (mega joules per kilogram)
Ethanol 29.7 MJ/kg
It would be miracle if ethanol could match gasoline for HP.

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  #26  
Old 07-19-2014, 10:30 AM
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Re: My Experience with E85 and V6

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Originally Posted by BobT View Post
It's not rocket science. Just compare the calorific values:
Gasoline 47.3 MJ/kg (mega joules per kilogram)
Ethanol 29.7 MJ/kg
It would be miracle if ethanol could match gasoline for HP.

As it stands today, I agree. I don't disagree that E85 has a higher octane rating or has the potential to boost HP... it's just that with having to tune an engine to run on all grades of pump gas today they can't take advantage of any real worthwhile HP gain.

And there's still the poorer fuel economy...
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  #27  
Old 07-19-2014, 11:19 AM
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Re: My Experience with E85 and V6

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Originally Posted by MDBones View Post
Yeah, and the EPA numbers never lie either.

Show me the Jeep numbers.

I came back to add something...

Here's a "real world" test. Based on the results there's little incentive to burn E85.

http://www.edmunds.com/fuel-economy/...ison-test.html
Yes, it does get lower fuel economy in a flex fuel motor, that has been well established.
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  #28  
Old 07-19-2014, 08:37 PM
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Re: My Experience with E85 and V6

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Originally Posted by MDBones View Post
As it stands today, I agree. I don't disagree that E85 has a higher octane rating or has the potential to boost HP... it's just that with having to tune an engine to run on all grades of pump gas today they can't take advantage of any real worthwhile HP gain.

And there's still the poorer fuel economy...
Maybe you already know this but higher octane is useful only if you have an engine with a higher compression ratio which then allows more of the fuel's energy to be utilised. Ethanol has only 63% of the energy of gasoline so an engine using ethanol would need a considerably higher compression ratio and correspondingly higher octane to achieve the same power output. Octane alone won't do it.
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  #29  
Old 07-19-2014, 08:41 PM
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Re: My Experience with E85 and V6

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Originally Posted by BobT View Post
Maybe you already know this but higher octane is useful only if you have an engine with a higher compression ratio which then allows more of the fuel's energy to be utilised. Ethanol has only 63% of the energy of gasoline so an engine using ethanol would need a considerably higher compression ratio and correspondingly higher octane to achieve the same power output. Octane alone won't do it.
To get the full power yes, but the timing can be advanced considerably, it's the same principle as tuning for 93 octane instead of 87. That is how ford and GM manage to get more power out of E85, gm is a step ahead though because the 5.3 is direct injected so it can be more precise.
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  #30  
Old 07-21-2014, 12:15 AM
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Re: My Experience with E85 and V6

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Originally Posted by loveracing1988 View Post
To get the full power yes, but the timing can be advanced considerably, it's the same principle as tuning for 93 octane instead of 87. That is how ford and GM manage to get more power out of E85, gm is a step ahead though because the 5.3 is direct injected so it can be more precise.
Quite true. Timing advance does give a performance improvement with higher octane fuel but without a compression ratio increase, the difference is slight. I tested this on a GM 3.6L V6 which had knock sensors and supposedly automatically adjusted timing. Any power increase was barely noticeable. There was an improvement in fuel economy but the difference did not cover the increased cost of the higher octane fuel.
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