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Hot Days And Cold Days

PhilGTR

By PhilGTR,
in Engines & Forced Induction

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PhilGTR Rising Star

PhilGTR

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Posted

Just a couple of curious questions,

When driving on a hot day like 34 degrees and on a cold day like 14 degrees how much power would a car on average lose?

Also with the aircon on, on a hot 34 degree day is it normal to see the engine water temp rise when not moving up to like 85 degrees?

Thanks

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mad082 Grand Master

mad082

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Posted

when not moving the car is always going to get hotter as there is much less air flowing through the radiator. but 85 degrees isn't really that hot.

as for the performance difference, there certainly would be a difference. how much depends on mods. if you have a fmic then you will see less of a difference than if you have the stock. if you are running big boost then you will see more of a difference too. on the dyno i have seen differences of up to 20-30hp (on a 400hp car) difference between 1st and 3rd runs on a dyno on a hot day.

PhilGTR Rising Star

PhilGTR

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when not moving the car is always going to get hotter as there is much less air flowing through the radiator. but 85 degrees isn't really that hot.

as for the performance difference, there certainly would be a difference. how much depends on mods. if you have a fmic then you will see less of a difference than if you have the stock. if you are running big boost then you will see more of a difference too. on the dyno i have seen differences of up to 20-30hp (on a 400hp car) difference between 1st and 3rd runs on a dyno on a hot day.

Thanks for that, yeah today is really hot 34 degs and i noticed that my car feels like it is pulling slightly less hard compared to a normal cooler morning. Damn hot days! my inlet temp was like 54 degrees.

Color_Of_Green Enthusiast

Color_Of_Green

Posted
Posted

my gtst was tuned nicely at around 279rwkw but has recently had some timing taken out at the top due to warmer weather (was pinging) to a top of around 263 rwkw.. (same dyno & tuner )

In my case the difference is 16 rwkw..

yes it is noticable, but only slightly.

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