Using DFCO to increase fuel economy
#41
01-22-2009 | 11:56 AM
Member
Joined: Dec 2008
Posts: 59
From: Honolulu, HI
Thanks for that tip! I'll try it out today...
Any other tips you can give for automatic transmission would be great!
I didn't even bother trying the standard shift Fit Sport at the dealership because I KNOW I would have driven that one home. Wife can't drive standard so automatic it is!
Any other tips you can give for automatic transmission would be great!
I didn't even bother trying the standard shift Fit Sport at the dealership because I KNOW I would have driven that one home. Wife can't drive standard so automatic it is!
#42
01-22-2009 | 07:42 PM
Member
Joined: Dec 2008
Posts: 59
From: Honolulu, HI
When you use DFCO with an AT, it works longer if you use the paddles to downshift when the engine reaches 1300 RPM or so (Sport mode FTW). You can keep doing that till you reach 2nd gear. I do not recommend downshifting into 1st when moving, except in situations when you need to take off FAST.
Also, if the engine is turning at only ~1100 RPM to begin with, it might not go into DFCO at all unless you downshift.
Using A/C or defrost will make it harder to go into DFCO as well. If you are in 5th gear and using A/C or defrost, you will usually need to downshift to 3rd to get DFCO.
Also, if the engine is turning at only ~1100 RPM to begin with, it might not go into DFCO at all unless you downshift.
Using A/C or defrost will make it harder to go into DFCO as well. If you are in 5th gear and using A/C or defrost, you will usually need to downshift to 3rd to get DFCO.
#43
01-23-2009 | 01:47 PM
Member
Joined: Apr 2008
Posts: 540
From: Northeast GA
Sometimes, ScanGauge won't show a proper reading for about 4 seconds. Plus, my ScanGauge didn't need adjustment, but sometimes they do need adjustment to show the DFCO (pgs. 16 and 17 of the ScanGauge manual).
Also, for me it takes a few minutes for the engine to warm up before it will start using cutoff in anything besides 1st and 2nd.
#44
01-23-2009 | 09:10 PM
Member
Joined: Dec 2008
Posts: 59
From: Honolulu, HI
I tried it in "S" and "D" mode and neither of them seemed to have an effect. I did a long coast down a hill in my area and downshifting seemed to raise the GPH reading.
Maybe there is something different going on with the 2009 GE8? I wonder if any other GE8 owners with a scangauge could chime in?
Maybe there is something different going on with the 2009 GE8? I wonder if any other GE8 owners with a scangauge could chime in?
#45
01-23-2009 | 10:19 PM
Member
Joined: Apr 2008
Posts: 540
From: Northeast GA
I tried it in "S" and "D" mode and neither of them seemed to have an effect. I did a long coast down a hill in my area and downshifting seemed to raise the GPH reading.
Maybe there is something different going on with the 2009 GE8? I wonder if any other GE8 owners with a scangauge could chime in?
Maybe there is something different going on with the 2009 GE8? I wonder if any other GE8 owners with a scangauge could chime in?
The only thing I can figure right now is that the ScanGauge "cutoff" value may need to be changed...
#47
01-27-2009 | 03:06 AM
Member
Joined: Apr 2008
Posts: 540
From: Northeast GA
Fuel cutoff on GE8
Okay, after a little digging, I found this post
https://www.fitfreak.net/forums/eco-...tml#post498323
which says:
Hope this helps 
https://www.fitfreak.net/forums/eco-...tml#post498323
which says:
With my '09 AT at a stop, the ScanGauge II shows fuel use at about .29GPH in gear, and .18GPH in neutral with the engine warm. When the engine is cold, the difference is much less.
Coasting down long hills in gear generally causes GPH to drop to zero, but a very gradual hill may not, where neutral will use less fuel.
...
The Gallons Per Hour (GPH) or Liters Per Hour (LPH) is probably the most useful for monitoring this, though some custom setup of the ScanGauge II will help.
Set the gauges to display Throttle Position Sensor (TPS) and note the value displayed at no throttle. Mine is 13. The Cuttoff value should be set to four above that, So I set mine for 17 (p16 in the manual).
When the ECU reports an open-loop condition with no throttle, the GPH reading goes to zero, indicating injector cutoff. LP (closed loop/open loop) can also be set as a gauge option.
Coasting down long hills in gear generally causes GPH to drop to zero, but a very gradual hill may not, where neutral will use less fuel.
...
The Gallons Per Hour (GPH) or Liters Per Hour (LPH) is probably the most useful for monitoring this, though some custom setup of the ScanGauge II will help.
Set the gauges to display Throttle Position Sensor (TPS) and note the value displayed at no throttle. Mine is 13. The Cuttoff value should be set to four above that, So I set mine for 17 (p16 in the manual).
When the ECU reports an open-loop condition with no throttle, the GPH reading goes to zero, indicating injector cutoff. LP (closed loop/open loop) can also be set as a gauge option.
#48
01-28-2009 | 06:47 PM
Member
Joined: Dec 2008
Posts: 59
From: Honolulu, HI
Well I tried for the last two days but I've never seen GPH go to zero. It must be really hard to get it to zero with an Automatic Trans or I'm doing something wrong. I think just putting the car in neutral might be better than trying to get it into DFCO.
I wish i could put in a FAS switch but I dunno how that would work with Automatic transmission, nor do I know how to wire it up.
I wish i could put in a FAS switch but I dunno how that would work with Automatic transmission, nor do I know how to wire it up.
#52
01-31-2009 | 10:00 PM
Member
Joined: Dec 2008
Posts: 59
From: Honolulu, HI
Okay this is strange. IF I put the LP gauge on, THEN I see GPH go to zero. If I DON'T have LP on it never shows zero GPH. Maybe this is why I never saw DFCO, but I don't understand why.
Is the scangauge giving correct information? Is GPH showing zero correct? I wonder why GPH won't show zero when LP is not on? Maybe I'm missing something.... hmmm.
Is the scangauge giving correct information? Is GPH showing zero correct? I wonder why GPH won't show zero when LP is not on? Maybe I'm missing something.... hmmm.
#53
02-01-2009 | 12:53 AM
Member
Joined: Apr 2008
Posts: 540
From: Northeast GA
I think something else is going on here. Maybe a defective unit, or the ECU is giving funky signals. I have a suspicion that if you keep LP on one gauge, you will see the MPG reading go to 9999 during DFCO...
contact the ScanGauge mfr?
contact the ScanGauge mfr?
#54
07-09-2009 | 07:02 PM
Member
Joined: Oct 2008
Posts: 148
From: PA
I know this is a somewhat old post but I wanted to share something that I noticed. I am a 2009 AT Sport and I have a scanguage. If I reset the sgII to defaults the DFCO works every time. I filled up quite a few times and now today I noticed that my car is not doing DFCO. When I fill up my tanks I noticed that the amount filled is always off by a little bit. Just last time I think the fill up screen said it was off by 8.8%. Do I have settings incorrect? I also noticed that if I am climbing a hill and am running high revs and am over something like 50% throttle sometimes the mpg would go to 9999. Does anyone know why and how to fix that? Btw when the sgII did show dfco it was within 3 seconds.
How does everyone else climb large somewhat long hills ecoficiently? My gps said it is about a 600ft climb that I take everyday.
How does everyone else climb large somewhat long hills ecoficiently? My gps said it is about a 600ft climb that I take everyday.
#55
07-10-2009 | 12:29 AM
Member
Joined: Apr 2008
Posts: 540
From: Northeast GA
Not sure about your problem. As for hills, I'm still trying to figure it out. It seems the MT guys have it easier, since: a) their transmission isn't quite as tall as ours, keeping the engine more in the powerband; and b) the manual transmission doesn't unlock the torque converter when you don't want it to.
My technique so far for hills is to coast downhill in neutral at around 55-60, then pop it back in gear just before the bottom of the hill, and try to maintain 55-60 up the hill, trying to use 80% load or less, but no more than 90 on very steep hills.
If anyone else knows a better technique, I would appreciate hearing about it. I'm very disappointed in my AT because of fuel economy on hills.
My technique so far for hills is to coast downhill in neutral at around 55-60, then pop it back in gear just before the bottom of the hill, and try to maintain 55-60 up the hill, trying to use 80% load or less, but no more than 90 on very steep hills.
If anyone else knows a better technique, I would appreciate hearing about it. I'm very disappointed in my AT because of fuel economy on hills.
#57
07-29-2009 | 07:20 PM
Member
Joined: Apr 2008
Posts: 540
From: Northeast GA
You can just let off the gas suddenly, and it will go into DFCO if you're going fast enough. It will slip out of DFCO once you have slowed down to about 35, so you would downshift to 4th at about 40-45 MPH, then 3rd at 35, then 2nd at 25-30 to keep the fuel cut off (Those numbers are for automatic transmissions).
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