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Old 03-14-2021, 02:04 PM   #1
RupertPupkin

 
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Ethanol content and tuning.

Car was tuned with alcohol content between 50-55%. If I run straight e85, which typically reads 70-75%, what will happen?
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Old 03-14-2021, 03:44 PM   #2
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do you mean ethanol? E85 is 85% ethanol.

Typically your tune has to be tweaked if you plan on running straight E
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Old 03-14-2021, 04:03 PM   #3
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Yup. Runing flex fuel.
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Old 03-14-2021, 04:32 PM   #4
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Depends on how it was tuned... ask you tuner.

By the fact that it's more alcohol, then you'd be using more fuel. "They" say you usually use 30% more volume of fuel E85 over 93/91.

Possibility: the tune was correctly setup in all the alcohol tables to will add slightly more timing in the higher RPM/load areas. You will also need slightly more fueling but it looks like your fuel system should be able to handle that. I've been told by several tuners that anything over 40% alcohol starts to run about the same, and I interpreted that as hitting diminishing returns. I haven't experimented enough to know any different yet.

If the tune was set up correctly, then you'd notice a difference driving the car with straight 93/91 octane compared to having a tank with +50% alcohol in it, by the additional timing on a WOT pull; but likely not noticeable between 50% and 75% alcohol difference.

I've attached a couple the alcohol tables that adjust timing for alcohol. The smaller table is the percent of timing on the larger table that is added/subtracted to the main timing table. These are my chosen numbers as my local station runs 70% max. Sometimes I fill up in a town on the way to the strip and it has been 85% at time. I run with whatever I have in the tank as I am tuned for the whole spectrum of alcohol in the fuel.

Also, you have an octane and a alcohol power enrichment tables. The more alcohol, the more swayed the PE will toward that ratio (if the tuner used different PE ratios).
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Old 03-14-2021, 06:57 PM   #5
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Quote:
Originally Posted by dreksnot View Post
Depends on how it was tuned... ask you tuner.

By the fact that it's more alcohol, then you'd be using more fuel. "They" say you usually use 30% more volume of fuel E85 over 93/91.

Possibility: the tune was correctly setup in all the alcohol tables to will add slightly more timing in the higher RPM/load areas. You will also need slightly more fueling but it looks like your fuel system should be able to handle that. I've been told by several tuners that anything over 40% alcohol starts to run about the same, and I interpreted that as hitting diminishing returns. I haven't experimented enough to know any different yet.

If the tune was set up correctly, then you'd notice a difference driving the car with straight 93/91 octane compared to having a tank with +50% alcohol in it, by the additional timing on a WOT pull; but likely not noticeable between 50% and 75% alcohol difference.

I've attached a couple the alcohol tables that adjust timing for alcohol. The smaller table is the percent of timing on the larger table that is added/subtracted to the main timing table. These are my chosen numbers as my local station runs 70% max. Sometimes I fill up in a town on the way to the strip and it has been 85% at time. I run with whatever I have in the tank as I am tuned for the whole spectrum of alcohol in the fuel.

Also, you have an octane and a alcohol power enrichment tables. The more alcohol, the more swayed the PE will toward that ratio (if the tuner used different PE ratios).
That’s the answer Si was more looking for. Hell if my car was running and making what it was making with a dog sh** tune, then I guess it could only get better. From what ive experienced so far, ive definitely noticed a difference between 93 with 10-15% ethanol, compared to having 55% ethanol.
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Old 03-23-2021, 09:16 PM   #6
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Check out Goat Rope Garage
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Old 03-23-2021, 09:25 PM   #7
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Originally Posted by KenBaker View Post
Check out Goat Rope Garage
I actually watched that vid a couple of days ago.
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Old 03-24-2021, 01:00 AM   #8
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So the tuner did actually want you to show up with "E85" in the tank? And not tune on 93 first, then add "E85" to tune on it? From one of your previous threads.
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Old 03-24-2021, 06:47 AM   #9
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Originally Posted by Badbubba View Post
So the tuner did actually want you to show up with "E85" in the tank? And not tune on 93 first, then add "E85" to tune on it? From one of your previous threads.
Wanted a premixed blend already. I showed up with 1/4 if not less of 93 and 10gal of e85
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