Miles to empty on 2017 86?

[frslee]

go full throttle all the time.

Full throttle = 6MPG x 13.2 gallon = 79.2 miles per tank

[humfrz]

Originally Posted by billwot

...and the rate of heat transfer is directly proportional to the delta T between the 2 entities. So any heat added to the fuel will slow that rate at which the pump can give up its heat to the fuel.

Well, that is true ....... but you didn't solve the problem (answer the question).....

If you had a FR-S fuel pump (pumping fuel out), in the tank, with 12 gallons of gasoline, how long would it take to raise the temperature of the gasoline 1.0 degree C .

Allow me to get you started:

(or you can use @Overdrive 's method "The answer is: Imhotep is invisible, and the train will arrive in Nova Scotia in 27 hours".)





humfrz

[billwot]

Originally Posted by humfrz

Well, that is true ....... but you didn't solve the problem (answer the question).....

If you had a FR-S fuel pump (pumping fuel out), in the tank, with 12 gallons of gasoline, how long would it take to raise the temperature of the gasoline 1.0 degree C .

Allow me to get you started:

(or you can use @Overdrive 's method "The answer is: Imhotep is invisible, and the train will arrive in Nova Scotia in 27 hours".)





humfrz

Well, its really a moot point because the flow of fuel through the pump provides adequate cooling. So the rate of transfer to the liquid in the tank is really not a concern.

But regardless, the unknown value for the calculation is the amount of heat generated by the pump (Btu/h).

BTW, the mass (and specific heat) of gasoline is not the same as it is for water.

BTW, weren't you an OSU Engineering grad?

[Tcoat]

Originally Posted by billwot

BTW, weren't you an OSU Engineering grad?

Back row third from right!

[humfrz]

Originally Posted by billwot

Well, its really a moot point because the flow of fuel through the pump provides adequate cooling. So the rate of transfer to the liquid in the tank is really not a concern.

But regardless, the unknown value for the calculation is the amount of heat generated by the pump (Btu/h).

BTW, the mass (and specific heat) of gasoline is not the same as it is for water.

BTW, weren't you an OSU Engineering grad?

True.

True, that is the unknown

True (just substitute gasoline for water in the equation)

Well, you got the OSU grad correct ....... but NOT an engineer. My first year I was in the college of engineering, with plans on transferring to the Colorado School of Mines, to become a geophysical engineer.

The problem was ....... I wasn't smart enough, so I shifted gears and went into the college of agriculture.


humfrz

[navanodd]

Originally Posted by billwot

Well, its really a moot point because the flow of fuel through the pump provides adequate cooling. So the rate of transfer to the liquid in the tank is really not a concern.

But regardless, the unknown value for the calculation is the amount of heat generated by the pump (Btu/h).

BTW, the mass (and specific heat) of gasoline is not the same as it is for water.

BTW, weren't you an OSU Engineering grad?

I just started mathing this out using conservation of energy, and remembered how much I dislike heat transfer.

Anyone want to check to see how much current the fuel pump draws? That's your energy input. I also don't think heat loss to the environment is insignificant.

[Overdrive]

Originally Posted by reeves

Not sure how accurate Torque App is, but it always indicates 2.4 gallons left every time the fuel light comes on. And that light's come at least a dozen times for me.. it's always at 2.4 gallons.

So you can go 60 miles at least on the highway if you drive conservatively (using 93 octane). I've driven 62 miles once after the light came on.. cruising at 65-70mph. And still had 0.5 gallons left (again, according to the Torque app). Wasn't trying to get myself stranded on the side of the road or anything, just wanted to run the tank as empty as possible before filling up with E85.

Not sure how accurate it is either, but probably not super great. Our tank is about 13.2 gallons, so regardless of what the app reads, pay attention to how many gallons you fill up with when the light comes on. Ideally it'd happen right as you park at the pump so you could really know at what point the light comes on. Just subtract whatever the pump reads when it shuts off (no topping off) from 13.2 gallons. If the 2.4 from Torque is accurate, that means your light comes on when you've used 10.8 gallons, and that seems (to me, at least) a little late to be coming on. When mine came on a few days ago I still had a lot of driving to do, and when I got to the pump I ended up putting in 11.133 gallons. I'm pretty sure I used more than a third of a gallon of gas driving a good 20+ miles from light on to gas pump. I'm sure the light comes on aggressively to get people to fuel up sooner rather than push it.

Anyway, the tank is designed to keep a couple of gallons in reserve for those brave souls who want to let the needle go past the "E", and to try to keep the tank from going completely dry since that's where real damage to the pump, fuel system, and engine can occur. So as a rough number, I'd say maybe 11.5 gallons is what you have from full to the empty line. That leaves you a little less than 2 gallons in reserve so that the tank doesn't truly go empty unless someone pushes it to exhaustion.

[billwot]

Originally Posted by navanodd

I just started mathing this out using conservation of energy, and remembered how much I dislike heat transfer.

Anyone want to check to see how much current the fuel pump draws? That's your energy input. I also don't think heat loss to the environment is insignificant.

Actually, its the current (amps) X the voltage. (watts)

[navanodd]

Originally Posted by billwot

Actually, its the current (amps) X the voltage. (watts)

Of course, my bad. Knowing it's a 12V system, I was fixated on finding the current to calculate.

[humfrz]

Originally Posted by navanodd

I just started mathing this out using conservation of energy, and remembered how much I dislike heat transfer.

Anyone want to check to see how much current the fuel pump draws? That's your energy input. I also don't think heat loss to the environment is insignificant.

Well, I don't know but, I suggest you could use 20 amps for calculation purposes ...... see how that works out.

GO ....... navanodd !!......


humfrz

[PatSciFRS]

Originally Posted by humfrz

Well, I don't know but, I suggest you could use 20 amps for calculation purposes ...... see how that works out.

GO ....... navanodd !!......


humfrz

Even if the pump did draw 20A, it would be wrong to assume that 240W of heat was being produced. Most of the power goes to pumping the fuel, only a fraction goes to generating heat.

[humfrz]

Originally Posted by PatSciFRS

Even if the pump did draw 20A, it would be wrong to assume that 240W of heat was being produced. Most of the power goes to pumping the fuel, only a fraction goes to generating heat.

Good point .......


humfrz

[StraightOuttaCanadaEh]

I get about 550 km on 94 octane. According to google that's 340 miles. Goddamn thirsty SOB this car is

[PDM 2]

Originally Posted by StraightOuttaCanadaEh

I get about 550 km on 94 octane. According to google that's 340 miles. Goddamn thirsty SOB this car is

550KM? That's pretty damn good. I'm less than half tank right now but im at 300KM lol. Im on 91, maybe i should try 94 ..