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Old 10-06-2016, 05:03 AM   #15
guybo
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Originally Posted by Spacemane969 View Post
contrarily at 89% humidity and 64 degrees in the morning; and only 76% humidity and 71 degrees during the ride home,

Relative humidity depends on the temp as much as the amount of water in the air. Check on the weather site for Dew Point instead- that is the absolute amount of water in the air independent of temp.

64° at 89% RH = 61° DP

71° at 76% RH = 63° DP

I don't think your car will notice a diff in 2° of dew point, nor will you. The diff between 64 and 71... I'd say that was all butt-dynoitis and there was not real difference. Were you in a lot of traffic on the ride home? If you were in some stop n go traffic and your intake got heat soaked, that'd cause some issues.

That's not a real high dew point and is pretty much a perfect temp for the ride home. Your car will like that a lot better than 90°+ and a 70°+ dew point like in the summer though. That's the nasty muggy weather.
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Old 10-06-2016, 10:53 AM   #16
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"The horsepower and torque available from a normally aspirated internal combustion engine are dependent upon the density of the air... higher density means more oxygen molecules and more power... lower density means less oxygen and less power."


...and for those of you who slept through high school physics, cold dry air is more dense ("oxygen-rich") than warm moist air.
https://wahiduddin.net/calc/cf.htm
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Old 10-06-2016, 03:56 PM   #17
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Performance is markedly better when not in the middle of 100+ degree South Carolina summers. It helps not having to run the A/C 100% or the time as well.
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Old 10-06-2016, 04:09 PM   #18
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Originally Posted by guybo View Post
Relative humidity depends on the temp as much as the amount of water in the air. Check on the weather site for Dew Point instead- that is the absolute amount of water in the air independent of temp.

64° at 89% RH = 61° DP

71° at 76% RH = 63° DP

I don't think your car will notice a diff in 2° of dew point, nor will you. The diff between 64 and 71... I'd say that was all butt-dynoitis and there was not real difference. Were you in a lot of traffic on the ride home? If you were in some stop n go traffic and your intake got heat soaked, that'd cause some issues.

That's not a real high dew point and is pretty much a perfect temp for the ride home. Your car will like that a lot better than 90°+ and a 70°+ dew point like in the summer though. That's the nasty muggy weather.
Yea I considered the traffic going home to be not at all a fair comparison, I could have been feeling something that wasn't there, but it's still hard to dismiss..
Thanks for breaking it down.
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Old 10-06-2016, 07:07 PM   #19
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Its mainly the temperature difference that seems to help...been very nice the past few weeks with the cooler weather, summer finally seems to be on its way out. Humidity is usually highest at the lower temperatures though, if you look at Temperature/Humidity charts you will see the 'phase shift' going on where humidity drops as the temperature increases throughout the day and rise during the night, peaking just before sunrise.

Very Hot temperatures + humidity feels much worse on your body than cooler temperature + higher humidity levels though. Going from highs in the high 90's to low in high 60's that first time had a very noticeable effect on the car.... It's almost nice enough to not have to run the A/C now, but still not quite yet...

Things I have noticed the FR-S loves:

- Cool Autumn weather
- 40% fuel level (optimal handling)
- Lightweight wheels and tires, and with the tires being slightly smaller in diameter
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Old 10-07-2016, 08:41 AM   #20
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Humidity does affect it but not as much as temp if I recall correctly. Probably placebo
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Old 10-07-2016, 01:39 PM   #21
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Humidity does affect it but not as much as temp if I recall correctly. Probably placebo
Yep, technically, the amount of oxygen in air is reduced, when the humidity is increased.

But, like you said ..... it may not be significant.


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Old 10-07-2016, 01:45 PM   #22
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Yep, technically, the amount of oxygen in air is reduced, when the humidity is increased.

But, like you said ..... it may not be significant.


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Not just the amount but the compressibility of the air in general. More due to the heat than the humidity though. That is one reason why turbos get intercoolers.


I saved us $120K a year just by bringing cooler outside air into the plant compressors at work (they used to just draw the air from around them). We see about a 10% to 15% decrease in their efficiency during the hot humid days in summer. Now, of course these are compressing way more air than any car does but the principle remains the same.
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