Long Range Fuel Tank 30 gallons ordered [ADMIN WARNING: NO POLITICS]

[SHANUT]

I don’t the regular fuel gauge would be affected but I’m assuming the DTE and MPG calculation is based off of the car thinking the tank is 20 gallons. If you increase the capacity, the calculations are off. Not a huge deal but I’m just curious how it’ll integrate.

Yep

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[5GENIDN]

I don’t think the regular fuel gauge would be affected but I’m assuming the DTE and MPG calculation is based off of the car thinking the tank is 20 gallons. If you increase the capacity, the calculations are off. Not a huge deal but I’m just curious how it’ll integrate.

The miles until empty is calculated by the vehicle.... I used to get 16.5 MPG and it would calculate 300 miles to empty... a few mods later and I get 12 MPG and It tells me 200 miles to empty with a full tank.... I would think a larger tank and 5 or 6 tank fulls it would start calculating a more accurate estimation... I could be wrong.

 

[Techun]

The miles until empty is calculated by the vehicle.... I used to get 16.5 MPG and it would calculate 300 miles to empty... a few mods later and I get 12 MPG and It tells me 200 miles to empty with a full tank.... I would think a larger tank and 5 or 6 tank fulls it would start calculating a more accurate estimation... I could be wrong.

Depends how it's programmed. If tank size is hard coded it's going to be confused.

 

[5GENIDN]

Depends how it's programmed. If tank size is hard coded it's going to be confused.

True... but how does it adjust to a different MPG? again, I may be wrong but I would think it is not calculating MPG based on engine performance since my MODs were not engine related... I simply drove fewer miles on a full tank of gas.

And, it took a few tanks to adjust.

 

[1979]

True... but how does it adjust to a different MPG? again, I may be wrong but I would think it is not calculating MPG based on engine performance since my MODs were not engine related... I simply drove fewer miles on a full tank of gas.

And, it took a few tanks to adjust.

The computer knows how much fuel it’s consuming, it calculates that vs miles driven. The MPG probably would not be affected by a larger tank. The DTE is calculated using MPG vs remaining fuel level. If the car starts with a 20 gallon tank it’ll likely base the calculation on that number. If you change to a 30 gallon tank, the DTE calculation would be off.

 

[5GENIDN]

The computer knows how much fuel it’s consuming, it calculates that vs miles driven. The MPG probably would not be affected by a larger tank. The DTE is calculated using MPG vs remaining fuel level. If the car starts with a 20 gallon tank it’ll likely base the calculation on that number. If you change to a 30 gallon tank, the DTE calculation would be off.

If that is how the code is written then you would be right.... If the code is somehow measuring the gallons pumped to the engine as opposed to tank level... Wonder what it would do with the bottom end of the tank. Sensor should still show gas in the tank but 0 miles to empty? I get it that early on it is going to say 0 miles to empty way early... but when you have run through a couple of Tanks? You are probably right... I am just having a hard time tying that to a tank level measurement. but you are saying tank measurement and miles to empty are completely independent.

 

[rayofsi]

I mean looking at the install videos.... It looks like some sort of float sensor to measure. Sorry I've been really busy. No time to bang this project out .

 

[ThunderFlash]

You guys are rocking it. Very refreshing to have folks just listen and consider. Depending on the review from the OP here, consider me a very likely future customer.

That response might be the honorable Chinese way of saying, "F* off".

I'd consider a larger tank for our fuel capacity challenged 2-door. I'm at a tolerable 15 mpgs combined now with the added weight and parasitic drag, but I'm guessing there will be a few additional swigs per mile after the heavier Baja Boss tires come along.

 

[RobWTX]

So since we are not 100% sure on the DTE calculation, I say carry a gallon of fuel, run it till it dies, then see how close it was. Add that gallon, and go to the nearest station to add the other 29 gallons.

Report back with your findings.

 

[orion]

Maybe this will help you guys on DTE calculation.

https://forscan.org/forum/viewtopic.php?t=14698

 

[swamp2]

It's simple, the float or sensor only measures height. When area changes due to a modified tank the same height means more fuel is present (in this case 50% more fuel) and hence DTE will be low by the same amount.

All of the other adjustments are just consumption (mpg) based on drag, tune, driving style and fuel type and those get reset by flashing a tune (and perhaps battery disconnect - not sure). This results in the classic large overestimate of DTE after a flash. This adjustment is done by measuring actual consumption rate, which the PCM obviously does, in real time and accurately. So the tank volume isn't part of this adjustment.

Although the system does need the tank specific height to volume conversion to estimate DTE, this or some equivalent conversion factor isnt in FORScan nor in any way user accessible. The 2D obviously has a different hard coded volume/factor/table built in.

Unfortunately, in the Bronco we don't get what the F series have (the above post is F series!) as they need to support a wide variety of factory tank options and fleet options.

 

[ThunderFlash]

Unfortunately, in the Bronco we don't get what the F series have (the above post is F series!) as they need to support a wide variety of factory tank options and fleet options.

I got to think it's in the tables some where for the 2-dr/4-dr variable, no?

I was thinking the same thing that the tanks variable geometry may not mean 1/2 tank on the gage means 15 gallons is remaining in the new tank, even if the level sensor is fully capable of monitoring the level in the new tanks volume.

 

[Chrome_Pony]

It's simple, the float or sensor only measures height. When area changes due to a modified tank the same height means more fuel is present (in this case 50% more fuel) and hence DTE will be low by the same amount.

All of the other adjustments are just consumption (mpg) based on drag, tune, driving style and fuel type and those get reset by flashing a tune (and perhaps battery disconnect - not sure). This results in the classic large overestimate of DTE after a flash. This adjustment is done by measuring actual consumption rate, which the PCM obviously does, in real time and accurately. So the tank volume isn't part of this adjustment.

Although the system does need the tank specific height to volume conversion to estimate DTE, this or some equivalent conversion factor isnt in FORScan nor in any way user accessible. The 2D obviously has a different hard coded volume/factor/table built in.

Unfortunately, in the Bronco we don't get what the F series have (the above post is F series!) as they need to support a wide variety of factory tank options and fleet options.

For another data point, I have personally put a 36gal Titan tank in my LWN.

That DTE functions as you described with the float arm giving roughly correct range countdown (as you mentioned, remaining range is underestimated in a larger tank volume with the same depth float arm).

Functionally, the larger tank doesn't affect my driving experience at all other than the much-appreciated longer time between fill-ups (with a corresponding longer fill-up time, the diesel's gotta burp). I have the Banks iDash flash me a 15% fuel remaining warning, and occasionally run it down far enough for the factory 10% light to come on.

What is more noticeably wrong is the Estimated Range Countdown, because it does not account for the extra 15 gallons. Rather than try to fix it or reprogram something, I just never use that DIC screen.

Going to be a bit tougher with the Bronco as the range countdown estimate is always on display.

 

[swamp2]

I got to think it's in the tables some where for the 2-dr/4-dr variable, no?

Well, it's in a table somewhere in the system, writable by Ford. It's just not in FORScan and almost for sure not somewhere where a tuner can access either.

 

[BigMeatsBronco]

It's simple, the float or sensor only measures height. When area changes due to a modified tank the same height means more fuel is present (in this case 50% more fuel) and hence DTE will be low by the same amount.

All of the other adjustments are just consumption (mpg) based on drag, tune, driving style and fuel type and those get reset by flashing a tune (and perhaps battery disconnect - not sure). This results in the classic large overestimate of DTE after a flash. This adjustment is done by measuring actual consumption rate, which the PCM obviously does, in real time and accurately. So the tank volume isn't part of this adjustment.

Although the system does need the tank specific height to volume conversion to estimate DTE, this or some equivalent conversion factor isnt in FORScan nor in any way user accessible. The 2D obviously has a different hard coded volume/factor/table built in.

Unfortunately, in the Bronco we don't get what the F series have (the above post is F series!) as they need to support a wide variety of factory tank options and fleet options.

In forscan, the tank size is definitely adjustable on Ranger Raptors as well. Plenty on threads on this topic, in Australia, with the Australian versions that have been out before Broncos were even released. "2019"...pretty sure the function still works. The accurate tank size is critical DTE functioning properly.
Im using F 150 sender in my bronco with OEM dual fuel pumps.

I DONT KNOW WHY YOU SAY FORSCAN CANT DO THIS???

heres proof...took all of 5 min.

Just like many other four scan changes.You also have to do an additional change...

FUEL LEVEL SOURCE BY IPC NOT PCM.

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