Quote from: FoMoCoSHO on April 20, 2015, 08:44:43 PM
Quote from: ShoBoat on April 20, 2015, 08:11:14 PM
So after a few days of Data logging and a Forscan update, I believe that I have found out the issue. Rail pressure is dropping to below 1000 on the WOT runs. However the fuel to air ratios are within spec just below 11. It looks like the simplest solution is typically the correct one. The "winter gas" which on more research has less BTU energy than summer gas. The, butane and propane that are laced in the fuel in higher quantities mess with the AFR and the car thinks it's running lean and continues to dump more and more fuel to compensate. Add into the mix at least 10% Ethanol and you get the picture. Less BTU energy and lighter fuels and we have a situation that the car can't solve on it's own. This is the reason that on the stock tune the car has no issues whatsoever. With the V8 tune regardless of 91 or 93 map it runs like crap when it gets cooler outside. This is the reason that it went away for a few days, the ambient temp rose above 20C here during that time. Then on Saturday it dropped below 10C. Yesterday the high for the day was 8C. With the increased demand on the car the fuel system in combination with the LMS V8 tune was not up to the task. I sent my logs to LMS which I will post below. I have not had a response as of yet, I don't really expect anything to materialize. Their attitude towards data logging through the OBD2 port is well known. Even though Ford does use it to diagnose your car or truck through the same port. I had a similar issue last spring when I switched to the V7 tune, then the V7CW and finally to the V8 tune. I had my car at the dealer several times looking for an mechanical issue (none were found) with the car and then suddenly it went away all on it's own. This was in May. After it was warmer and the local stations switched from winter to summer gas formulations. I'm not sure if there is a difference with Canadian and American winter gas formulations, or if like me guys in colder climates revert to stock for the winter. This could be the reason not more issues have materialized. I still plan on trying out a 91 non Ethanol fuel and see what that does.
It seems that a few I told you so's might be in order so get it off your chests lol.
I forgot to mention the logs below were taken on the same day same conditions.
Could it be your HPFP?
Was that pump pressure or rail pressure?
I've seen lower pump pressure than that without misfires and the car held AFR as well.
I ran the gamut of E blends tuned and untuned and the car never behaved like yours.
I did run out of fuel twice this winter but due to bitter cold and me being a little overzealous with the corn 
Rail pressure, LP was over 100PSI both tunes. I don't believe that the car was actually running out of fuel. More like flooding itself. I read an article on how the different fuels, like propane, butane and ethanol mess with the O2 readings. For example. The car is reading 10.8 AFR, when in fact its more like 10 already. Tuners have to account for this when tuning for E85 or Methanol. The AFR reading in the car is calling for more fuel more fuel. And eventually it either runs out of gas or in my case misfires due to too much fuel. If you look at the AFR readings on the car during the runs you can actually see when the misfire occurs and one bank will go rich. Down 0.5 lower then the other side. The car never actually leans out. The car is flooding itself (kinda like an old school carb lol).
Below is some notes that I found on the different afr values for E85 for instance. Propane and Butane also effect the stoichiometric air-fuel ratio.
http://www.brighthubengineering.com/machine-design/15235-the-stoichiometric-air-fuel-ratio/E85 has a stoichiometric fuel mixture of roughly 9.78-9.8:1 in E85's purest form (Class 1 85% Ethanol summer blend). As the fuel's Ethanol content goes up the stoich range goes down. For instance, 100% Ethanol's stoich is about 9.0:1.
E85 will maintain max brake torque much richer than stoich than gasoline will. But, because of it's excellent detonation threshold(due to lower combustion temps, lower peak cylinder pressures..etc), it can be run much closer to stoich than gasoline safer. E85 reaches max thermal efficiency at about 13% richer than stoich, whereas gasoline is about 16% richer than stoich(with pump gas being even richer). But again, E85 can maintain Max Brake Torque well into the 30% richer than stoich range, unlike gasoline which is limited to about 18% rich of stoich. DISCLAIMER: Just because E85 itself will still make power at super rich AFRs, doesn't mean it's a good idea or even recommened. A whole host of issues come with running super rich AFRs, that you need to be aware of, but i will cover later.
Therefore Max Rich Torque of E85 is 7.1:1- 8.5:1
"With that being said, here is what i would consider a very safe and conservative fuel tune on E85. *AFR's listed in bold are for widebands o2s that are calibrated for gasoline, AFR's in ( ) are actual E85 AFR:
Part Throttle lean (max eco) AFR of 16.5:1(11.0:1) 12.4% leaner than STOICH
Part Throttle rich AFR of 14.7:1(9.8:1)
Spool up... AFR of 13.5:1(9.00:1)
WOT... AFR of 12.1:1(8.06:1) 17.7% richer than STOICH
*If you're using a wideband that is calibrated for gasoline(14.7:1) and cannot change the calibration of the wideband, take your gasoline AFR and divide it by 1.5 to get actual e85 AFR or use the wideband in lambda mode. 1 lambda is 9.8:1
Here are some common AFR conversions(Gas AFR on left, e85 on right):
18.0:1=12.000
17.5:1=11.666
17.0:1=11.333
16.5:1=11.000
16.0:1=10.666
15.5:1=10.333
15.0:1=10.000
14.5:1=9.666
14.0:1=9.333
13.5:1=9.000
13.0:1=8.666
12.5:1=8.333
12.0:1=8.000
11.5:1=7.666
11.0:1=7.333"
