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How to Improve Winter MPG's

winter mpgs

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154 replies to this topic

#141 OFFLINE   ptjones

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Posted 03 January 2018 - 03:12 PM

Under those conditions you really need block/ oil pan heaters to have a chance of getting enough heat in the ICE to turn it off. :sad: In my opinion all Hybrids should come with block heaters standard.  

 

Paul









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#142 OFFLINE   fbov

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Posted 03 January 2018 - 06:36 PM

+1

 

I found this graph below which shows how a Li Ion SOC varies with temperature.  Basically, at low temperatures the usable capacity of the battery declines significantly and depends on discharge rate. So, the algorithms will likely limit the amount of discharge resulting in ICE running more at low temperatures.  The battery symbol gauge may show a very high SOC, but in reality there is very little usable SOC and ICE will run more than at a higher temperature.

 

attachicon.gifCapture.PNG

Great data. Note the chart is in Celsius; -20C is -4F.

 

We're about to get a spell of sub-zero this week. I remember from two years ago what it's like driving with a cold HVB. This chart shows why sub-zero is a special case, where our EV systems can't function. Note this is for discharge; no charging below 32F. 

 

Have fun,

Frank



#143 OFFLINE   ptjones

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Posted 03 January 2018 - 06:41 PM

+1

 

Great data. Note the chart is in Celsius; -20C is -4F.

 

We're about to get a spell of sub-zero this week. I remember from two years ago what it's like driving with a cold HVB. This chart shows why sub-zero is a special case, where our EV systems can't function. Note this is for discharge; no charging below 32F. 

 

Have fun,

Frank

That's brutal. :sad:  I don't know if having a heater inside the car is going to help much.

 

Paul



#144 OFFLINE   joshg678

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Posted 03 January 2018 - 09:49 PM

That's brutal. :sad:  I don't know if having a heater inside the car is going to help much.

 

Paul

I was considering a space heater in front of the car and one inside lol.

 

I do think i will be buying the oil pan heater though.  How long do you leave yours on for Paul?



#145 OFFLINE   raadsel

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Posted 04 January 2018 - 07:55 AM

I was considering a space heater in front of the car and one inside lol.

 

I do think i will be buying the oil pan heater though.  How long do you leave yours on for Paul?

 

I recall one person, posting on another forum, mentioning that he adapted an electric blanket to sit on top of the battery and keep it warm. I believe he stated he toyed with the idea of a space heater but discarded the idea as there was too much risk.



#146 OFFLINE   obob

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Posted 04 January 2018 - 10:36 AM

Some winter notes:

 

I have/had a strap on seat warmer.  I was not very careful to keep it unwrinkled.  Well it shorted out and something melted plastic onto my seat and/or the seat was scortched a bit.

 

If I had a garage to keep my car in I probably would check for wind leaks.  If it is an attached garage it has warm walls.  I recently bought an old house and am finding ways to stop some of the cold air leaks.

 

And these external faucet covers seem to work well to stop cooling the pipes in the house or garage: https://www.homedepo...-1981/204759083


Edited by obob, 04 January 2018 - 01:59 PM.

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#147 OFFLINE   Bill-N

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Posted 05 January 2018 - 11:46 AM

 

And these external faucet covers seem to work well to stop cooling the pipes in the house or garage: https://www.homedepo...-1981/204759083

 

Since we're drifting a bit off topic, I've found bubble wrap held on with bungie cords (or the ever-popular duct tape) also works.


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#148 OFFLINE   joshg678

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Posted 05 January 2018 - 11:47 AM

I put tape over my top grill today, High of 15 Estimated for today.

I think there was a difference, my WT was up to 170 this morning when i got to work, but only got 42mpg.


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#149 OFFLINE   ptjones

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Posted 14 January 2018 - 11:08 AM

This morning at 9AM temps were only 22*F Brrr. sad.png  And got 48mpg going 7 mi. to work.  Started with 44% SOC, 85*F WT, garage was 49*F and ended up with 40% SOC.

 

Paul



#150 OFFLINE   SnowStorm

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Posted 31 January 2018 - 12:38 PM

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

Hey Paul, will this arrangement work for a grill cover?  When the weather warms up it goes away!

 

gallery_656_57_80274.gif


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#151 OFFLINE   ptjones

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Posted 31 January 2018 - 10:05 PM

Yes, but you need to make sure all the openings are blocked off. :lol:

 

Paul



#152 OFFLINE   SnowStorm

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Posted 02 February 2018 - 10:52 PM

The snow didn't last long  :cry: so I finally got around to making a real grill cover from clear flexible vinyl sheet with 4 clips at top and 4 at bottom.  It covers essentially everything except the top slot above the FORD emblem. After 250 miles I can say it definitely works.  Some weeks back I did some "baseline" runs to see how hot the transmission would get and it went to about 100F to 110F above ambient with engine coolant around 180F (I think).  On this trip the ambient was 35F to 40F, the transmission went to about 140F above ambient (175 to 180F) and the engine stayed in the 220F to 230F range!  Its a bit early to judge the increase in mileage but it could be 2 or 3 mpg.  :)  It will take several tanks of fuel to get a good feel for mileage since there is so much variation in conditions between trips (rain, wind, temps).

 

I guess if the transmission gets too hot I'll cut a hole in front of the cooler.  Does anyone know a good long term maximum temperature for the transmission coolant?  Not the absolute maximum but what you could run at for 100k miles without any harm.

 

(P.S. I switched to Trip 2 today to measure something and couldn't help noticing that since last reset (almost 5000 miles) the indicated mileage was 47.0 MPG!  And that's during winter!  Who said the C-Max isn't a 47 MPG car?!)


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#153 OFFLINE   ptjones

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Posted 05 February 2018 - 05:55 PM

I would try to keep TFT below 190*F and WT below 230*F,  put holes in bottom grill cover, not middle. BTW my Life Time average MPG went up to 49.5 mpg on trip to SF last week with winter temps.  :)

 

Paul



#154 OFFLINE   SnowStorm

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Posted 07 February 2018 - 10:47 PM

Next 250 miles was warmer ambient, 55F for several hours.  TFT went to 185F, 130F above ambient.  Even with some cabin heat (not recirc) the engine cooling fan was coming on periodically with WT at 230F.  So, too much cover for 55F conditions.  Looks like about 45F might be the break point where ICE stays warm without cooling fan needed.



#155 OFFLINE   ptjones

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Posted 11 February 2018 - 02:26 PM

Using Defrost HI Temp drops temps radically in a few seconds.  :)  It usally takes 5 -10 min. for temps to come up again.

 

Paul








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