Cold Weather=More power. Why? - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

czar07 · 12-01-2013, 05:11 PM

Its the extra oxygen molecules in the same volume of air. Its not more air being stuffed in.

OICU812 · 12-01-2013, 05:21 PM

Curious is this no longer being taught in schools? I'm asking as by assumption the OP may be a young fellow but obviously old enough to drive. Discussions on air density etc for me in school were far before the age of 16 so just curious is all.

trekkie · 12-01-2013, 05:31 PM

You expect people to remember chemistry and physics after high school? It was a class you had to pass, not something you use in life, just like algebra and fractions

OICU812 · 12-01-2013, 05:34 PM

Pretty sure I learned that in like grade 5 or 6 "Science" actually.

Sorry I guess I have had to deal with "cold air" every year of my life where I live so perhaps it was obvious as a youngster even and well can't forget when you see cold temps again and again yearly lol. Everything with a motor always is beast in winter.

BANGER · 12-01-2013, 06:15 PM

I should really switch to a CAI.
I think I've been irrationally afraid of hydrolocking for too long.
I do live in SoCal after all...

humfrz · 12-01-2013, 08:19 PM

Quote:

Originally Posted by trekkie

You expect people to remember chemistry and physics after high school? It was a class you had to pass, not something you use in life, just like algebra and fractions

Well, I learnt about the cold air thing, back on the farm; I noticed my tri-cycle would go faster, during the cool of the evenings ....... I wonder if that is related ....??

humfrz

chrisl · 12-01-2013, 08:30 PM

Quote:

Originally Posted by Speedy000

because u dont have your ac on!

I know you're kidding, but this shouldn't make any difference on any modern car - all modern cars should automatically disconnect the AC compressor when full throttle is applied, so it shouldn't make any difference in available power.

Suberman · 12-01-2013, 08:37 PM

Does the BRZ have knock sensors? If it does then the engine won't make more power in cold weather.

Turbo engines do if they are intercoolers.

Suberman · 12-01-2013, 08:39 PM

Quote:

Originally Posted by chrisl

I know you're kidding, but this shouldn't make any difference on any modern car - all modern cars should automatically disconnect the AC compressor when full throttle is applied, so it shouldn't make any difference in available power.

Not only that but the compressor doesn't run at all in cold weather because the evaporator would freeze up. Plus 3C or about 40F is the lowest temperature at which the AC can operate. There's an anti frost switch which opens at that temperature and disconnects the drive pulley from the compressor.

Rico415 · 12-01-2013, 10:10 PM

Quote:

Originally Posted by czar07

Its the extra oxygen molecules in the same volume of air. Its not more air being stuffed in.

which make it more dense (MASS PER VOLUME) hence more air.... And it is not just more oxygen all elements in "air" are equally represented.

Tt3Sheppard · 12-02-2013, 10:35 AM

I wonder if this is related to the engine cutting power when it gets too hot. I remember reading about a dyno test that saw a significant power decrease after just 1 pull in semi hot conditions.

Deep Six · 12-02-2013, 09:40 PM

Dry Cold air is Mother Nature's version of forced induction. The difference at the drag strip is extreme. Not unusual to see a half second difference between best and worst conditions.

czar07 · 12-03-2013, 04:58 PM

Quote:

Originally Posted by Rico415

which make it more dense (MASS PER VOLUME) hence more air.... And it is not just more oxygen all elements in "air" are equally represented.

Yes you are right, but I am just being pedantic about the term "more air" which to me sounds like a larger volume of air, which is NOT the case unless you are FI

OrbitalEllipses · 12-03-2013, 04:59 PM

Air density.

/thread

12-01-2013, 05:11 PM	#15
czar07 Senior Member Join Date: Sep 2011 Drives: '97 RSP JZZ30 GT-T Location: Australia Posts: 612 Thanks: 365 Thanked 192 Times in 101 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Its the extra oxygen molecules in the same volume of air. Its not more air being stuffed in. __________________ Germans>Japanese>Italians>Americans. Unless its a Corvette.

12-01-2013, 06:15 PM	#19
BANGER mad tyte jdm y0 Join Date: Nov 2011 Drives: 2010 Civic FA1 Location: Temecula, California Posts: 178 Thanks: 24 Thanked 79 Times in 39 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	I should really switch to a CAI. I think I've been irrationally afraid of hydrolocking for too long. I do live in SoCal after all... __________________

12-02-2013, 09:40 PM	#26
Deep Six Senior Member Join Date: May 2013 Drives: 2013 FRS / 2013 427 Vert Location: Orlando Posts: 611 Thanks: 212 Thanked 328 Times in 197 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	Dry Cold air is Mother Nature's version of forced induction. The difference at the drag strip is extreme. Not unusual to see a half second difference between best and worst conditions. __________________ [SIGPIC][/SIGPIC] 2013 FR-S Asphalt BC Coils/Rev Works UEL header/HKS Front Pipe/Racing Brake BBK/Shorai LW Battery/ACT 6 Puck Clutch/FBM Radiator & Oil Pan/JR Oil Cooler/Jackson Racing High Boost C30/Rev Works Built Motor 2016 Audi TTS APR Tuned

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12-01-2013, 05:31 PM	#17
trekkie Member Join Date: Oct 2013 Drives: 2011 Camry Hybrid Location: Wake Forest, NC Posts: 82 Thanks: 10 Thanked 20 Times in 14 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	You expect people to remember chemistry and physics after high school? It was a class you had to pass, not something you use in life, just like algebra and fractions

12-01-2013, 08:37 PM	#22
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12-03-2013, 04:59 PM	#28
OrbitalEllipses Banned Join Date: Jan 2012 Drives: Attitude Location: MD Posts: 10,046 Thanks: 884 Thanked 4,889 Times in 2,902 Posts Mentioned: 123 Post(s) Tagged: 4 Thread(s)	Air density. /thread

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