[rofl] Oh man... ^ times a million.Holy smokes Altis, you are so wrong about A/C its not even funny.
I have a scangauge on my 2012. When coasting (foot off of accelerator) in drive the system goes into open loop and shuts down the injectors.[rofl] I do wish I had better than circumstantial for you on this, but I don't have the Scan Gauge. I can tell you that since I stopped coasting to stops in neutral and started coasting in gear I've gained what appears to amount to around 1-2 mpg. Admittedly it's tough for me to say whether this is due to break-in or the coasting adjustment.
I'm not sure how you gained anything by not coasting. lol[rofl] Oh man... ^ times a million.
GoShockers: I do wish I had better than circumstantial for you on this, but I don't have the Scan Gauge. I can tell you that since I stopped coasting to stops in neutral and started coasting in gear I've gained what appears to amount to around 1-2 mpg. Admittedly it's tough for me to say whether this is due to break-in or the coasting adjustment.
Right. I was trying to offer some information on what the overall improvement of that really is. It's a fine little bit of knowledge, but if it amounted to 1/20th of an mpg then I wouldn't care. It looks like it's significant, though, at least for my drive.I have a scangauge on my 2012. When coasting (foot off of accelerator) in drive the system goes into open loop and shuts down the injectors.
I have noticed it consistently goes back into closed loop at 25 mph and below. Upon taking your foot off of the accelerator their appears to be about a 2 -3 second delay before it goes into open loop. If you give the accelerator the slightest bit of gas it goes right back into closed loop.One other question for you... someone suggested that there might be a cutoff speed where the injectors come back on if you're going too slow? I don't see driving any differently but I am curious. E.g., if you're coasting in gear below 25 MPH then it still feeds the engine fuel?
At 51 psi, I would imagine that you would lose whatever fuel advantage you gain at that pressure to the cost of replacing the tires early due to wearing the center of the tread prematurely.The other hypermiling item I noticed is that the Tires: Continental contiprocontact, have a maximum 51 psi. I would guess that filling the tires that full would lower the rolling resistance significantly. (I personally would not fill the tires that high during winter/snow season.) The Focus Super Fuel Economy package uses four items to achieve the extra 2 miles per gallon (highway only): low rolling resistance tires, active grill shutter, rear spoiler, and aerodynamic wheel covers. From what I have read, the low rolling resistance tires probably make up 75% of the 2 MPG improvement.
Good write-up, thanks. I'm inclined to agree to a great extent about the tires making the biggest difference. I'd be curious to get some kind of official breakdown from Ford. I know it'll depend in part on the kind of driving you do, but, face it, all those aero upgrades aren't going to help that much if you spend most of your drives under 35MPH. The tires will, though.From what I have read, the low rolling resistance tires probably make up 75% of the 2 MPG improvement.
Not to mention 51psi would probably be a safety concern. Goodbye traction.At 51 psi, I would imagine that you would lose whatever fuel advantage you gain at that pressure to the cost of replacing the tires early due to wearing the center of the tread prematurely.
The SFE package really only has 3 exclusive items (tires, spoiler, wheel covers) now that the shutters are included on all Focus models after the "Job #2" updates on March 5th.
Hey do you have an engineer friend that knows anything about the DCT? Would be nice to get some inside info on that.I have a few friends that are engineers at Ford. One of them is a mechanical engineer working on engines.
So sounds like DFSO may never engage if you're running the A/C, listening to the radio and charging you're iPod at the same time. Which is not at all uncommon.The fuel shutoff feature uses more than half-a-dozen variables to calculate when to shutoff the fuel going into the engine. The main three are: throttle position/ brakes applied, engine RPM, and load (A/C, defrost, read window defrost, all other electric current draw: lights, radio). The other variables are items such as engine temp, vehicle speed.
The 2012 has a UEGO (wideband) as the primary sensor.BUT about DFCO...... really want to get a good idea? get a wideband. I cant imagine it would be too different but on my 22 year old car, any time the engine is at or near operating temperature, it will cut off fuel as soon as I let off the pedal; load or no load, as long as I have been ON the gas then let off, it will shut off (defaulting the wideband to 22.4:1 afr) It does not do this at idle or cruise as it shouldn't
The car slows with the engine when in gear. We just mean "coasting" as in "foot off the accelerator," whether in neutral or in gear.I'd like you guys to define coasting a bit better with these cars. Can you feel the whole thing slowing down with the engine or does it just coast like it is in neutral?
It sounds simple but I'm totally unfamiliar with that... What is it?BTW, a scangauge isn't necessary to determine open/closed fuel status.
Put the ICD in test mode and monitor FUEL FLOW.
It is a rolling counter. The counting speed is proportional to the fuel consumption. When the count stops, the injectors are off.