5 Minute throttle response/DCT solution? - Focus Fanatics
Ford Focus Forum
HomeContact UsAbout UsGalleryDiscussion ForumsMarketplace



Go Back   Focus Fanatics > 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    
FocusFest Ford Focus Tire & Wheels FocusFanatics Merchandise

 
 
Thread Tools Display Modes
Prev Previous Post   Next Post Next
Old 09-13-2013, 12:59 AM   #11
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: 80
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 online now  
    Reply With Quote
 

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 11:33 PM.


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

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.