02-20-2019, 04:27 AM | #15 |
Drives: '17- 1ag37 V6 traded, for 1SS 2018! Join Date: Mar 2018
Location: MA
Posts: 469
|
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. |
02-20-2019, 08:38 AM | #16 | |
Drives: '20 ZL1 M6 Join Date: Apr 2017
Location: FT. Lauderdale, FL
Posts: 723
|
Quote:
Just my $.02.
__________________
Mal
Ft. Lauderdale, FL '20 Camaro ZL1 M6 '22 Kawasaki ZX-14R |
|
02-20-2019, 08:41 AM | #17 |
Drives: 50th SS Convertible Join Date: Jul 2017
Location: Swanton, Ohio
Posts: 103
|
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.
|
02-20-2019, 09:20 AM | #18 |
Drives: SS A8, NPP, Red Hot Join Date: Jan 2019
Location: Toledo, OH
Posts: 583
|
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. |
02-20-2019, 09:30 AM | #19 |
Drives: SW 1SS 1LE / Jeep XJ Join Date: Mar 2016
Location: WPB,FL
Posts: 799
|
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. |
02-20-2019, 10:05 AM | #20 |
Drives: 2017 2SS, 50th pkg, M6, MRC, NPP Join Date: Jan 2016
Location: Ocean City, NJ
Posts: 3,298
|
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.
|
02-20-2019, 10:18 AM | #21 |
Banned
Drives: 2017 Super Sport Cam. Join Date: Feb 2018
Location: US
Posts: 893
|
Definately and hP and Tq increase in cold temps. I'd say at least 10hp.
|
02-20-2019, 01:06 PM | #22 |
Drives: '17 Camaro 2SS & '99 Camaro Z28 Join Date: Feb 2014
Location: Austin, TX
Posts: 1,874
|
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.
|
02-20-2019, 01:16 PM | #23 | |
Drives: 17 Camaro SS 1LE & 16 Sierra AT CC Join Date: Nov 2016
Location: Norman, OK
Posts: 2,424
|
Quote:
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.
__________________
2019 Corvette Z06 2LZ A8 - Halltech CAI, AWE non-catted X-pipe, Mamo V2 ported TB 592rwhp, bone stock 566rwhp
2017 Camaro SS 1LE - Procharger D1SC w/ Tial 2" BOV & Race intercooler / ARH full length catless headers / Alky meth injection system - 650rwhp on conservative tune SOLD |
|
02-20-2019, 02:30 PM | #24 |
Drives: 2018 Camaro SS 1LE Join Date: Oct 2018
Location: Treasure Coast, FL
Posts: 384
|
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.
|
02-20-2019, 03:29 PM | #25 |
Drives: '17- 1ag37 V6 traded, for 1SS 2018! Join Date: Mar 2018
Location: MA
Posts: 469
|
"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??? |
02-21-2019, 08:09 AM | #26 |
Drives: 1SS, A8, MRC, NPP, Blade Spoiler Join Date: Jun 2010
Location: MD
Posts: 1,485
|
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.
|
02-21-2019, 08:09 AM | #27 | |
Drives: 2017 2SS M6 FIFTY @51fifft Join Date: May 2017
Location: California, Woodland
Posts: 187
|
Quote:
WTF your kidding right?
__________________
|
|
02-21-2019, 08:21 AM | #28 |
Drives: SS A8, NPP, Red Hot Join Date: Jan 2019
Location: Toledo, OH
Posts: 583
|
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. |
|
|
Post Reply
|
|
|