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Old 02-20-2019, 04:27 AM   #15
mdhopt36
 
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All the nay-sayers-

(where were you when they passed out the thinking caps?)

Mine torqued the wheels loose when in the mid 20's F. (na)-- and quite unexpectedly when doing 35-40mph.
Every vehicle I ever owned always did better in cooler temps, bar none.
The converse is true, on a hot-a$$ day, setting in the sun, will run ragged/logey until it gets enough cool air in there to run better.
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Old 02-20-2019, 08:38 AM   #16
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Quote:
Originally Posted by cryssm View Post
I also feel a noticeable difference in cold weather vs. hot weather. As said, it's likely related to efficiency, but nonetheless. When it's 80-100 degrees here in Florida, vs the every now and then 40-60 degree weather, there is quite a difference. I would say more than anything the car doesn't feel as sluggish in the cold. Call me crazy! You wouldn't be the first.
I agree totally. Significant difference in my experience here in S. Florida. I'm no engineer, but I know cooler, more dense air means more O2 , and thus more mixture/charge. Drag racers always want cool air/fuel, e.g., cool cans, ice, etc. Dynos have correction factors because of this. Dyno your car at 50 degrees and 90 degrees using the uncorrected scale on the dyno.

Just my $.02.
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Old 02-20-2019, 08:41 AM   #17
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I've heard that larger engines see 1-2hp gain per 10 degrees drop in temperature. I'm assuming that is from 70 degrees. Maybe its more because I seem to believe there is more power too, yet I wouldn't think 5-10hp would be noticeable.
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Old 02-20-2019, 09:20 AM   #18
RyanR623
 
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Don't know about our engines, but my 16 WRX had compensation tables built into the ECU to compensate for the denser air. Retarded timing and lowered max boost. It was awful. Boost in the summer averaged 16 PSI, boost in the winter I was lucky to get to 13 PSI. It felt noticeably slower in the winter. They effectively eliminated boost season from their cars. Fail.

Turbocharged cars benefit a lot more from colder air, however. I doubt our cars have anything like that built in. Or at least I hope not.
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Old 02-20-2019, 09:30 AM   #19
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Just speculating but, with Port injection the tunes where less "precise" then they are now with DI. DI has torque targets and the like so regardless of temp it puts the same power out.

At Sebring my max speeds where identical on a 60F day to an 85F day.
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Old 02-20-2019, 10:05 AM   #20
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Originally Posted by Jim50thSS View Post
I've heard that larger engines see 1-2hp gain per 10 degrees drop in temperature. I'm assuming that is from 70 degrees.
There are different standards for the comparison with different temperatures. But it is more like 1% per 10 degrees F. This assumes testing is at same altitude, relative humidity, and barometric pressure.
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Old 02-20-2019, 10:18 AM   #21
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Definately and hP and Tq increase in cold temps. I'd say at least 10hp.
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Old 02-20-2019, 01:06 PM   #22
Need4Camaro

 
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The bigger issue is getting your summer tires to HOOK in cold weather. I have to practically baby my car if it gets 40 or below where as I may make less power at 115 but atleast it's all usable.
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Old 02-20-2019, 01:16 PM   #23
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Originally Posted by SJFGTO View Post
Your engine does not make more horsepower in cold weather it operates more efficiently at certain ambient temperatures as governed by the tune.


Actually this is incorrect, the engine actually does make more horsepower. Been known for year that it does. For every 10° decrease in ambient outside temps there is a 1% increase in HP output.

Cold air is more dense versus hot air.

Go from 100° ambient to 50° ambient and it is equal to a 5% increase in power. On a 450hp engine that is equal to 20hp gain.
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Old 02-20-2019, 02:30 PM   #24
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Personally it has much more to do with air density than temps. You could live 5k ft above sea level in 50 degree weather and i can be on florida at sea level at 90 degree weather and my car would still make more power thsn yours. It mostly comes down to how much air can be forced in or is available not SO much on how cold it is.
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Old 02-20-2019, 03:29 PM   #25
mdhopt36
 
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"Personally it has much more to do with air density than temps. You could live 5k ft above sea level in 50 degree weather and i can be on florida at sea level at 90 degree weather and my car would still make more power thsn yours. It mostly comes down to how much air can be forced in or is available not SO much on how cold it is...."

Well here we go.

Flying, at 10k feet, beyond that point you had better have a way to lean out the mixture of even a carburated engine so as not to burn rich....and -LOSE POWER-.
Air is quite a bit less dense at that altitude. Surpasses the temp dependent thing at the -SAME- density altitude.

Why don't you study why a helium balloon sinks when the room air gets warm???
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Old 02-21-2019, 08:09 AM   #26
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I have done HPDE's in hot and cold weather. I gain 10 MPH faster speeds on the front straight with cold wheather consistently, but I lose some speed in the turns because the tires don't heat up as much. We are talking 40 degrees vs. 90 degrees though.
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Old 02-21-2019, 08:09 AM   #27
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Originally Posted by SJFGTO View Post
Your engine does not make more horsepower in cold weather it operates more efficiently at certain ambient temperatures as governed by the tune.


WTF your kidding right?
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Old 02-21-2019, 08:21 AM   #28
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Originally Posted by 51FIFFT View Post
WTF your kidding right?
Actually in some instances he's correct, not for our cars that I've seen, but on certain engines they have compensation tables built into the ECU. Such was the case with my 2016 WRX. Max and average boost was lowered based on temperatures. It was awful. It felt noticeably slower in winter.

That said I HIGHLY doubt they do this in ANY naturally aspirated cars.
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