Flashpaq econo setting = lower mileage? - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 21 (permalink) Old 01-21-2018, 05:30 PM Thread Starter
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Flashpaq econo setting = lower mileage?

Have had the Flashpaq for a month or so and have experimented with high octane tune and economy setting. Some seat of the pants evidence as to the high octane tuning effect, but nothing overly dramatic. The surprise came on the last tank of fuel with economy setting where we experienced a drop in mileage by about 2-3 mpg? I'm considering a test with fewer variables related to type of driving, but a bit disapointed at this point.


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post #2 of 21 (permalink) Old 01-21-2018, 06:56 PM
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When you change the tune you need to let the ecu recalibrate the fuel mixture by driving for a while (one or two tanks of fuel). I never had luck at all using the econo tune however.
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post #3 of 21 (permalink) Old 01-21-2018, 07:00 PM
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I did some very unscientific testing, running the same 50 mile loop on the 87 performance tune, the 91 performance tune, the economy tune, and the stock tune with my Flashpaq, checking the amount drained from the tank each time rather than relying on the EVIC reading. From my tests they were all within 0.5 mpg of each other, and definitely within the margin of error. However, after months of driving, switching between tunes as needed, I noticed that the economy tune does move the shift points. It seems to shift more aggressively than stock, but far less aggressively than performance tunes, so I saw marginal improvements in city driving.

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post #4 of 21 (permalink) Old 01-22-2018, 09:01 AM Thread Starter
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Quote:
Originally Posted by consumedbywater View Post
I did some very unscientific testing, running the same 50 mile loop on the 87 performance tune, the 91 performance tune, the economy tune, and the stock tune with my Flashpaq, checking the amount drained from the tank each time rather than relying on the EVIC reading. From my tests they were all within 0.5 mpg of each other, and definitely within the margin of error. However, after months of driving, switching between tunes as needed, I noticed that the economy tune does move the shift points. It seems to shift more aggressively than stock, but far less aggressively than performance tunes, so I saw marginal improvements in city driving.
I'm definitely going to give it more time and make more comparisons. What makes this even more strange is that we noticed a slight uptick in mileage using the 91 octane tune....maybe the engine is more efficient with that fuel?


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post #5 of 21 (permalink) Old 01-22-2018, 12:07 PM
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Originally Posted by Kaiser View Post
I'm definitely going to give it more time and make more comparisons. What makes this even more strange is that we noticed a slight uptick in mileage using the 91 octane tune....maybe the engine is more efficient with that fuel?
It doesn't surprise me that you'll see better mileage with a higher octane fuel. A higher octane fuel contains more energy, so less of it will be used turning the engine. You'll see horsepower gains in the higher RPMs because of the extra energy, and at normal driving pace you'll be burning less fuel to keep the wheels turning. The tradeoff is the extra fuel cost, so unless you want the extra power of high octane fuel, you'll likely be better off saving 20+ cents per gallon using 87 octane.

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post #6 of 21 (permalink) Old 01-23-2018, 01:46 PM Thread Starter
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Originally Posted by consumedbywater View Post
It doesn't surprise me that you'll see better mileage with a higher octane fuel. A higher octane fuel contains more energy, so less of it will be used turning the engine. You'll see horsepower gains in the higher RPMs because of the extra energy, and at normal driving pace you'll be burning less fuel to keep the wheels turning. The tradeoff is the extra fuel cost, so unless you want the extra power of high octane fuel, you'll likely be better off saving 20+ cents per gallon using 87 octane.
I'll buy that, though I don't think fuel grades are related to btu's.


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post #7 of 21 (permalink) Old 01-23-2018, 02:14 PM
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I'll buy that, though I don't think fuel grades are related to btu's.
You're right, I was trying to simplify things. The better description is that higher octane fuel is more efficient in the sense that it's more difficult to detonate. A higher octane fuel allows for a much higher compression in each cylinder before it detonates, and more compression leads to a more powerful detonation. I'm not an expert on how the FlashPaq adjusts settings to handle the 91 octane fuel, but I would guess it adjusts fuel ratios and spark timing to take full advantage of the high octane.

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post #8 of 21 (permalink) Old 01-23-2018, 08:52 PM
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Quote:
Originally Posted by Kaiser View Post
Have had the Flashpaq for a month or so and have experimented with high octane tune and economy setting. Some seat of the pants evidence as to the high octane tuning effect, but nothing overly dramatic. The surprise came on the last tank of fuel with economy setting where we experienced a drop in mileage by about 2-3 mpg? I'm considering a test with fewer variables related to type of driving, but a bit disapointed at this point.
Can you be a little more specific Kaiser?

Which Superchips Flaspaq do you have?


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post #9 of 21 (permalink) Old 01-24-2018, 09:26 PM Thread Starter
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Quote:
Originally Posted by Big Blue View Post
Can you be a little more specific Kaiser?

Which Superchips Flaspaq do you have?
The F5 Flashpaq 3874


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post #10 of 21 (permalink) Old 01-24-2018, 09:27 PM Thread Starter
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Quote:
Originally Posted by consumedbywater View Post
You're right, I was trying to simplify things. The better description is that higher octane fuel is more efficient in the sense that it's more difficult to detonate. A higher octane fuel allows for a much higher compression in each cylinder before it detonates, and more compression leads to a more powerful detonation. I'm not an expert on how the FlashPaq adjusts settings to handle the 91 octane fuel, but I would guess it adjusts fuel ratios and spark timing to take full advantage of the high octane.
Good explanation. I wonder if in fact cylinder pressures are higher due to the tune.


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