5 Minute throttle response/DCT solution? - Page 19 - Ford Focus Forum, Ford Focus ST Forum
Ford Focus Forum
HomeContact UsAbout UsGalleryDiscussion ForumsMarketplace


Go Back   Ford Focus Forum, Ford Focus ST Forum > Ford Focus Third Generation > MK3 Focus

MK3 Focus The place to chat about general questions, window tinting, exterior body, interior and lighting upgrades for the third generation 2012-Current Focus.

Search This Forum | Image Search | Advanced Search    
Ford Focus Tire & Wheels FocusFanatics Merchandise

Reply
 
Thread Tools Display Modes
Old 09-13-2013, 12:59 AM   #181
Et cetera
Focus Enthusiast
 
Et cetera's Avatar
 
Join Date: Aug 2013
Fan#: 117795
Location: Tainan, Taiwan
What I Drive: 2013 Focus 2L TDCi 163PS (MPS6 DCT)

Posts: 81
FF Reputation: 1 Et cetera Good Standing Member
Buy-Sell-Trade Rating: (0)
Quote:
Originally Posted by PratoN View Post
Cold air is denser (as is air under higher pressure, ergo Ram-air) which means more molecules of air are in the same size volume (of the combustion chamber) - the mass air flow sensor (in conjunction with the oxygen sensors) are very accurate at remaining at (or near) stoichiometric fuel-to-air ratios. More oxygen, more fuel = more power for the same size engine.

Anyway, a heat engine is most efficient thermally when the difference in temperature is greatest, that is, cold air (100% oxygen?) and a super hot engine/flame temperature. But there are thermal/mechanical limits for high-temperature applications... Best case scenario for your engine is really cold / high pressure air and a warmed up engine.

People start seeing MPG go down in the winter due to the dense air raising the drag of the car itself (good for the engine, bad for moving things...), idling to warm-up, increased rolling resistance of tires, and a bunch of other things that I don't feel like getting into right now.
Thanks for the note. Interesting reading that as it just so happened that I need to brush up my thermodynamics (I took a general physics class back in my freshman year more than 40 years ago, which I rather enjoyed) for a project I am considering taking on.

I was just reading about Carnot heat engine and its (theoretical) efficiency and realized that I could not count on Wikipedia to teach me everything...
Et cetera is offline  
    Reply With Quote
Sponsored Links
Advertisement
 
Old 09-13-2013, 05:16 AM   #182
sanford12
Focus Enthusiast
 
sanford12's Avatar
 
Join Date: Jul 2013
Fan#: 116365
Location: Eureka, IL
What I Drive: 2012 Focus Titanium

Posts: 79
FF Reputation: 1 sanford12 Good Standing Member
Buy-Sell-Trade Rating: (0)
The biggest reason for increased fuel consumption is more fuel used at start up in cold weather and more fuel used to heat and maintain operating temperature of the engine plus your drawing heat from the engine to warm the cabin of the car. All that is paid for with increased fuel consumption. All the other reasons mentioned add to the increase but over coming the cold engine is the main one.
__________________
FoMoCo cars I've owned
1970 429 Cyclone, 1978 LTD II 302, 1980 Fiesta 2nd best Ford I've owned
1986 Tempo LX, 1990 Areostar,1996 Areostar Best vehicle I've ever owned
2005 Ford 500, 2006 Freestyle, 2012 Focus Titanium pearl white
sanford12 is offline  
    Reply With Quote
Old 09-16-2013, 01:24 PM   #183
gkirk
Focus Enthusiast
 
Join Date: Nov 2011
Fan#: 91903
Location: Annapolis, MD
What I Drive: 2012 C.Red Focus SE Sport Package

Posts: 245
FF Reputation: 3 gkirk Good Standing Member
Buy-Sell-Trade Rating: (0)
Quote:
Originally Posted by sanford12 View Post
The biggest reason for increased fuel consumption is more fuel used at start up in cold weather and more fuel used to heat and maintain operating temperature of the engine plus your drawing heat from the engine to warm the cabin of the car. All that is paid for with increased fuel consumption. All the other reasons mentioned add to the increase but over coming the cold engine is the main one.
Its ironic that as fuel efficiency goes up, it hits a point where the excess heat from the engine isn't enough to heat the car 'for free'.

With that said, i'm not sure that we're close to that yet. The excess waste heat from the focus's engine is probably enough to heat the cabin under almost any circumstance.

I did rent a tahoe once and going down from Taos Ski area back to the town, the engine didn't heat up at all until we hit the flats because the engine wasn't using any fuel.
gkirk is offline  
    Reply With Quote
Old 09-16-2013, 08:29 PM   #184
sanford12
Focus Enthusiast
 
sanford12's Avatar
 
Join Date: Jul 2013
Fan#: 116365
Location: Eureka, IL
What I Drive: 2012 Focus Titanium

Posts: 79
FF Reputation: 1 sanford12 Good Standing Member
Buy-Sell-Trade Rating: (0)
It is amazing how fast these cars warm up. I haven't driven it winter conditions yet but I don't see why it won't warm up faster than any other car I've had just as it does now.
__________________
FoMoCo cars I've owned
1970 429 Cyclone, 1978 LTD II 302, 1980 Fiesta 2nd best Ford I've owned
1986 Tempo LX, 1990 Areostar,1996 Areostar Best vehicle I've ever owned
2005 Ford 500, 2006 Freestyle, 2012 Focus Titanium pearl white
sanford12 is offline  
    Reply With Quote
Old 09-17-2013, 05:28 AM   #185
BrApple
Focus Enthusiast
 
BrApple's Avatar
 
Join Date: Mar 2012
Fan#: 95810
Location: Gales Ferry, CT
What I Drive: 2012 Red Candy SE HB

Posts: 373
FF Reputation: 1 BrApple Good Standing Member
Buy-Sell-Trade Rating: (0)
Quote:
Originally Posted by sanford12 View Post
It is amazing how fast these cars warm up. I haven't driven it winter conditions yet but I don't see why it won't warm up faster than any other car I've had just as it does now.
That is because the temperature guage will read "normal" when the coolant is just over either 100 or 150 degrees. No where near completely warmed up.
__________________
- 12 Focus SE - 5spd
- 99 Contour SeVT <- 3L/NPG Turbo
- 2k Contour SVT - #2137
- 12 Impreza 2.0i Premium - CVT
BrApple is online now  
    Reply With Quote
Old 09-17-2013, 11:16 AM   #186
gkirk
Focus Enthusiast
 
Join Date: Nov 2011
Fan#: 91903
Location: Annapolis, MD
What I Drive: 2012 C.Red Focus SE Sport Package

Posts: 245
FF Reputation: 3 gkirk Good Standing Member
Buy-Sell-Trade Rating: (0)
Quote:
Originally Posted by BrApple View Post
That is because the temperature guage will read "normal" when the coolant is just over either 100 or 150 degrees. No where near completely warmed up.
Does it cycle coolant before the engine is warmed up?

I thought it didn't cycle so it will warm up as fast as possible?
gkirk is offline  
    Reply With Quote
Old 09-17-2013, 11:49 AM   #187
Kabigon
Focus Fanatic
 
Join Date: Jul 2011
Fan#: 88299
Location: Torrance, CA
What I Drive: 2012 sterling gray Titanium

Posts: 3,003
FF Reputation: 10 Kabigon Great Standing Member
Buy-Sell-Trade Rating: (0)
Quote:
Originally Posted by gkirk View Post
Does it cycle coolant before the engine is warmed up?
No. It has a thermostat.
__________________
I am Kabigon and I approve this message.
Kabigon is offline  
    Reply With Quote
Old 09-17-2013, 12:35 PM   #188
jcw122
Focus Enthusiast
 
jcw122's Avatar
 
Join Date: Mar 2013
Fan#: 111081
Location: Philadelphia, PA
What I Drive: 2014 Race Red SE 201A Hatch - MTX

Posts: 309
FF Reputation: 2 jcw122 Good Standing Member
Buy-Sell-Trade Rating: (0)
My 2014 has little to no gap.
__________________
2014 SE in Race Red, 201A, Winter Package, Moonroof. Manual Transmission. e-Focus RMM. Snorkel Delete Mod. Love it!
jcw122 is offline  
    Reply With Quote
Old 09-17-2013, 08:00 PM   #189
Arco-Zakus
Focus Addict
 
Arco-Zakus's Avatar
 
Join Date: Jul 2012
Fan#: 101658
Location: Fremont, CA
What I Drive: 2014 SGM SE Sport Pkg Sedan 5sp-man

Posts: 868
FF Reputation: 10 Arco-Zakus Great Standing Member
Buy-Sell-Trade Rating: (0)
Amazing stuff, these instruments

Quote:
Originally Posted by BrApple View Post
That is because the temperature guage will read "normal" when the coolant is just over either 100 or 150 degrees. No where near completely warmed up.
In that case, what it is that is amazing is that the instruments are so misleading. I wonder why they would bother putting them in there if that's the case.
Arco-Zakus is offline  
    Reply With Quote
Old 09-17-2013, 08:16 PM   #190
suss6052
Focus Addict
 
suss6052's Avatar
 
Join Date: Feb 2012
Fan#: 95752
Location: ..., MI
What I Drive: 2013 Ford Focus ST2 Ingot Silver

Posts: 12,385
FF Reputation: 23 suss6052 Great Standing Member
Buy-Sell-Trade Rating: (3)
Quote:
Originally Posted by Arco-Zakus View Post
In that case, what it is that is amazing is that the instruments are so misleading. I wonder why they would bother putting them in there if that's the case.
The temperature gauge is a glorified idiot lamp. If you put the car in test mode you can see the actual temperature sensor reading, but they don't want you to.
__________________
Moderator for: DURATEC Ti-VCT Performance, ST Performance, MK3 Focus
suss6052 is online now  
    Reply With Quote
Reply

Bookmarks & Social Networks

Tags
dct fix , powershift fix
-->
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 10:19 AM.


Copyright 2002-2014 FocusFanatics.com. All Rights Reserved : Terms of Use : Privacy Policy : Advertise Information

Focus Fanatics Ford Focus Forum offers many fun ways for you to engage with other Ford Focus Owners from across the world. Whether it be about the aftermarket performance modifications, technical how-to's, European tuned suspension or awesome fuel economy similar to the Acura TLX or Fiesta ST. You can find all Ford Focus and Focus ST related information here. Join our Ford Focus discussion forums and chat with local Focus enthusiasts in your area.