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How to Improve Winter MPG's

winter mpgs

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125 replies to this topic

#121 OFFLINE   joshg678

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Posted 29 November 2017 - 07:37 AM

If you don't know, there is no sensor to measure coolant temperature. Coolant temperature is inferred from the Cylinder Head Temperature sensor data. IIRC, when I monitored both coolant temperature and CHT, coolant temperature = CHT less 5-7*F under normal operating temperatures. If CHT > 270F, DTC P1299 is thrown, the MIL illuminates immediately and fuel shut-off strategy is activated to reduce engine and coolant temperature. So, there is monitoring and controls in place to protect the engine from damage due to high engine temperature. 231F coolant temp. = about 238F CHT. 238 F is a long ways away from 270F. So, I doubt one would ever get to 270F unless there was loss of coolant or coolant circulation. I've seen coolant temps as high as about 235 -238 F going up steeper, long hills in the West at 75+ mph with temps in the 40's.

Thanks for those details, good info.
I’m not entirely convinced that temps that high won’t warp the head on the ICE, or head gasket issues.
Does anyone know if there’s a set temperature where the cooling fans turn on?







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#122 OFFLINE   Plus 3 Golfer

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Posted 29 November 2017 - 08:50 AM

Thanks for those details, good info.
I’m not entirely convinced that temps that high won’t warp the head on the ICE, or head gasket issues.
Does anyone know if there’s a set temperature where the cooling fans turn on?

There are many inputs to the algorithm which determines the operation of the radiator fan.  It is also a variable speed motor.

 

One other point on coolant temperature.  The monitoring of closed loop ICE operation has an exit point at 235F coolant temperature.  So, ICE is likely not operating at an ideal fuel/air mixture resulting in more emissions and lower ICE efficiency above 235F.

 

There are certainly unknowns with respect to using grille covers.  I very rarely used them in for the two years we spent in eastern TN and virtually never in the Phoenix area even though we see morning lows below between 35 - 50F very frequently in the winter in the Phoenix area.  It is simply not "cold enough" for me to spend the time to mount / remove on a frequent basis for the benefit.  Of course, hypermilers will look at it differently.  Only you can decide what makes you feel "good".


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#123 OFFLINE   fbov

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Posted 29 November 2017 - 12:06 PM

I live in Rochester, and have had all three grills blocked since some time in '14. I only monitor engine temp through My View, not an OBD interface, so I can only say it's never gotten past the middle of the range. If I lived in the Valley of the Sun, it may well have gone high enough that I would have removed one or more. I wouldn't worry much in the Northeast, and Paul's done well in the Southeast. But Ford did have specific design goals, so there are operating conditions where all the airflow is needed.

 

My View is your friend in this regard. I look at RPM and water temp, and regularly flip between it and Empower while driving. 

 

Have fun,

Frank


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#124 OFFLINE   joshg678

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Posted 29 November 2017 - 12:26 PM

My View is your friend in this regard. I look at RPM and water temp, and regularly flip between it and Empower while driving. 

I used to do that too, but got tired of it and got a scangauge haha.

I did notice that when my WT said 231F it was one notch higher on the temp gauge in my view.

 

Right now the Weather has been 32F in the morning, and 55+F during the day.  Kind of all over the place, lol.

My Typical driving the temp never gets about 180F.

 

I was Curious at what temperate the fan would just default to On (hi/med/low).

As i'm wondering if running at 230F would be running the fan and if that would cause extra drain(less efficient) vs just adding a small opening in the in the cover when doing longer drives being more efficient. 



#125 OFFLINE   ptjones

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Posted 29 November 2017 - 03:26 PM

Grill covers with holes
I have a cover over my lower Grill Cover.  Small front cover covers up holes in main lower Grill Cover and can be easily removed.  This will usually for most situations dropping temps down 15*F. :) 
 
Paul 


#126 OFFLINE   ptjones

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Posted 08 December 2017 - 11:14 AM

With Winter here now, temps in the mid 30's it is time to cover all the grills to conserve as much heat as possible.  BRRR :sad:  Yesterday I got 63mpg going to work with 46*F and some HVB charge and today only got 40.7*F with 34*F, sleet, rain and no HVB. :sad:

 

Paul








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