Cold Air,not intake. JUST COLD AIR

[FivepointOHYEAH]

So a cold front came through Houston the other day we had amazing 75 degree weather instead of 140 and my Pony spun its 275 wide tires whenever it wanted to and felt like it was just reborn. I understand lower temp means denser air but like 1-2% more power at the 15-20 degree difference I figured but it felt much more than that. Our engines run a 11:1 compression ratio so I am wondering if the high compression ratio capitalizes on the cold air more so than other cars do? Because Ive driven a lot of vehicles but they didn’t gain what felt like 50+ hp in 20 degree weather changes…. I could be just going crazy or someone could have poured oil on my tires while I was asleep.

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[redline727]

I believe it! My 13 was a completely different animal when there was nice cool air coming through. But don't be confused with loss of traction because of cold tires and pavement. But it's proven a fact. You can swing easily 20hp +/- depending on weather conditions. It is the whole reason for correction factors when dynoing a car. It allows you to compare losses or gains on different days do to weather changes. But you still always want to use the same dyno when comparing numbers. A lot of guys that live close to sea level with cold temps SAE (current widely used correction factor) will actually correct your horsepower down. For example: mock conditions between 2 different correction factors

SAE:
Air Temperature: 77F
Absolute Pressure: 29.23 inches Hg
Relative Humidity: 0%
Relative Horsepower : 100%
Air Density: 1.157kg/m3
Relative Air Density: 94.4%
Density Altitude: 1952feet
Virtual Temperature: 77F
Vapor Pressure: 0 inches Hg
Dyno Correction Factor: 1

STD: an older correction factor but still used
Air Temperature: 60F
Absolute Pressure: 29.92 inches Hg
Relative Humidity: 0%
Relative Horsepower : 104.8%
Air Density: 1.223kg/m3
Relative Air Density: 99.8%
Density Altitude: 67feet
Virtual Temperature: 60F
Vapor Pressure: 0 inches Hg
Dyno Correction Factor: .955

Uncorrected:
Is the actual power your car made in the exact weather conditions at that moment

So you can see weather plays the biggest part in how an engine performs. Bus is not just about temps. The difference in compression just amplifies the effects that much more. That's why you usually see boosted cars talk about it more.

 

[Barrel]

Lower temps will result in less traction and tire spin with summer tires. The warmer the tires the more traction you can get.

 

[Taneras]

It's real. I live in Louisiana and can tell a big difference towards the end of summer once we start getting some nice cold snaps. It's nothing crazy, but there is a noticeable difference.

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