Lie-o-meter or not...

[Eddie320]

I ran down to Portland and back from Seattle. First long highway run since I deleted it. 70mph I good chunk of the way. I was lucky in the past for it to read above 15mpg. Pay no attention to my tpms...



'09 6.4 F350 CCLB deleted straight
Pacific Northwest

 

[Fordguy100]

Miles driven/gallons used.

Its obviously off, but the above equation will tell you by how much.

 

[ckrueg]

My lie o meter is consistently off by 20 percent. So when I get 18 mpg hand Calc The lie o meter reads 18×1.2 or 21.6. I've been able to get 21 before on a long road trip though.

 

[Eddie320]

Miles driven/gallons used.

Its obviously off, but the above equation will tell you by how much.

I know. My point is, it used read accurate. And now this. How does it measure?

My lie o meter is consistently off by 20 percent. So when I get 18 mpg hand Calc The lie o meter reads 18×1.2 or 21.6. I've been able to get 21 before on a long road trip though.

I will keep checking it by hand and see off I am consistently off by the same percentage. Again, how the hell does it measure? Lol

'09 6.4 F350 CCLB deleted straight
Pacific Northwest

 

[ckrueg]

I have no idea, you'd think it would just calculate the flow by pulse width and rail pressure and that would be pretty accurate, but I've heard they use maf, boost and all sorts of other sensors.

 

[John bolt]

I take the numbers at every fill and put them in my spread sheet and it's pretty close on flat haul, driving like granny clampet empty over a distance.

 

[Eddie320]

I am going to start doing that. I would really like to find a consistency. I never really trusted the meter anyway. But it was darn close to right on, before I tuned and deleted

'09 6.4 F350 CCLB deleted straight
Pacific Northwest

 

[Mark Kovalsky]

I have no idea, you'd think it would just calculate the flow by pulse width and rail pressure and that would be pretty accurate, but I've heard they use maf, boost and all sorts of other sensors.

Pulse width is how it's calculated.

But it was darn close to right on, before I tuned and deleted

Tuners modify the software to trick the PCM into thinking the injectors have less flow than they really do. This makes the PCM open the injectors for a longer pulsewidth, so you get more fuel. The equation that the trip computer uses now also thinks you have smaller injectors, so it's fuel used calculation is off by however much the tuner modified it.

 

[Lipka101]

I read a thread in the past about this and if I remember correctly it ended up being a fuel rail pressure sensor on its way out.

 

[Eddie320]

Pulse width is how it's calculated.


Tuners modify the software to trick the PCM into thinking the injectors have less flow than they really do. This makes the PCM open the injectors for a longer pulsewidth, so you get more fuel. The equation that the trip computer uses now also thinks you have smaller injectors, so it's fuel used calculation is off by however much the tuner modified it.

Thanks!! Good info.

'09 6.4 F350 CCLB deleted straight
Pacific Northwest