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JB4 MPG
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01-22-2013, 11:11 AM | #2 |
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depends on how you drive.. i was able to increase my mileage while on the highway but in town when im on the gas all the time it went down obviously
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01-22-2013, 11:14 AM | #3 |
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Yes it does. With the latest ISO firmware, the waste gate default position can be moved to a point where there is less duty cycle on the wastegates during cruise conditions. This means slightly less boost when you first press on the gas pedal. Excessive precharging causes a decrease in fuel economy. I have noticed about a 1 mpg increase on the interstate at 80 mph which is where I normally cruise
At first, your fuel economy is going to go down as you constantly enjoy your newfound power (IE you flooring it a lot more), but as you grow accustomed to it, it will return to normal. The JB4 does not affect cruise fuel economy negatively unless you specifically set it up that way with a very agressive default WG position.
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01-22-2013, 03:44 PM | #4 |
ex deus machina
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without driving like a jackass, 36-38 on the highway, 20-22 in town
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01-22-2013, 03:46 PM | #5 |
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If you drive like a normal person it stays the same.
By no accident if you have a heavy foot the car will be faster and require more fuel to go faster. |
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01-22-2013, 03:49 PM | #6 |
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It depends on the firmware, the way you drive, and the gas. If you drive conservatively with economy settings you will easily pick up more MPG from the increased timing the JB4 can target (if you aren't on terrible gas). This is especially true running E85 mixes. The loss in economy is not nearly as large as one would think. You will actually save money by running E85.
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01-22-2013, 05:33 PM | #7 |
dat boost doe
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1mpg lost in the city 2-3 gained on the highway (i tend to use the throttle less).
granted at the track (the one with turns), i do 8-10mpg vs the seemingly constant 12 stock. so take that as u will
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01-22-2013, 06:07 PM | #8 |
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I have seen on the OBC 35-37mpg @ indicated 75mph on flat surfaces with the wastegate position set to "0," meaning no boost until I really ask for it. I'm running an earlier ISO 11C program which has seperate wastegate, and lag-fix value's vs. the later firmware
so yes, for some of is on the G5 board, MPG has improved in steady state cruising situations
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01-23-2013, 06:36 AM | #9 |
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Not sure if its better or worse but 21/22 is normal for me inside Raleigh City limits & 30 odd over the interstate.
Testing new firmware versions can push it down to 18.5/19
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01-23-2013, 05:09 PM | #10 |
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For some reason, after switching to iso, my OBC give a highway mpg of about 22 but doing the math says its close to 28. Anybody know why the computer thinks it's lower?
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01-23-2013, 09:30 PM | #11 |
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The JB4 isn't going to alter your MPG significantly, but your driving style will.
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01-24-2013, 12:01 AM | #13 |
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You will get a "reduced power" message but it should help some....
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01-24-2013, 05:17 PM | #14 | |
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I understand that higher timing and running a little lean can increase milage, but I don't really understand how running e85 can increase my economy or save me money. All the test results indicate the opposite. Can you elaborate on your statement? |
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01-24-2013, 05:57 PM | #15 |
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I spend more when I mix E85 and 93 because the loss in fuel economy is greater than the price difference.
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01-24-2013, 05:58 PM | #16 | |
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01-24-2013, 06:18 PM | #17 | |
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It's more expensive for me, but the money to horsepower ratio is better than most mods out there.
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01-24-2013, 07:33 PM | #18 | |
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01-24-2013, 07:42 PM | #19 | |
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01-24-2013, 07:45 PM | #20 | |
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01-24-2013, 08:37 PM | #21 | |
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E85 + Tune = |
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