02-21-2019, 10:24 AM | #29 |
corner barstool sitter
Drives: 08 Mustang GT, 19 WRX Join Date: Jul 2012
Location: Eastern Time Zone
Posts: 6,990
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Look up something called "density altitude".
Norm
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'08 GT coupe 5M (the occasional track toy)
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02-21-2019, 12:26 PM | #30 |
Drives: 2017 2ss, m6 Join Date: Jan 2017
Location: Iowa
Posts: 231
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Yeah this whole thread is pretty much proof positive that almost no one (at least in this thread) has ever done any serious performance work. Every real racer that I know travels with a portable weather device so they know for certain, at their location, the DA, temp, humidity ect. These numbers are critical to understand how the car (or aircraft) will perform.
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02-21-2019, 03:32 PM | #31 |
BAMF SS
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Your sarcasm meter is broken bro
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2016 1SS A8: FBO + Circle D + P1X + Meth + Tuned by Pray Performance
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02-21-2019, 06:24 PM | #32 |
Drives: 2021 LT1 10 speed auto Join Date: May 2013
Location: Connecticut
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02-21-2019, 06:38 PM | #33 |
Drives: SS A8, NPP, Red Hot Join Date: Jan 2019
Location: Toledo, OH
Posts: 583
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Yes colder denser air provides more horsepower given there aren't compensation tables built into the ECU. I think the real question I'd like to know is what temperature Chevy tested the lt1 to get to 455hp. Based on dyno numbers I've seen it must have been at 115 degrees at high altitude ha ha!
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02-22-2019, 01:04 AM | #34 |
Drives: 16' Supercharged 1SS Join Date: Apr 2014
Location: Scottsdale, AZ
Posts: 650
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Unless you're boosted you're not going to feel a difference between ambient temps.
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02-22-2019, 07:38 AM | #35 | |
Drives: 1SS, A8, MRC, NPP, Blade Spoiler Join Date: Jun 2010
Location: MD
Posts: 1,485
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Quote:
From what I understand, the MAF (Mass Airflow Sensor) measures the MASS of the air going by, so no compensation for altitude or pressure should be needed. If the sensor was just a volumetric flow meter, you would have to know and compensate for the changes in air pressure because that would change the amout of air even if you have the same amount of flow, but by measuring the mass, you already have the number you need, no compensation necessary, just add the correct amount of fuel based on the amount of air, and BOOM, proper combustion... |
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02-22-2019, 08:08 AM | #36 |
Drives: '17- 1ag37 V6 traded, for 1SS 2018! Join Date: Mar 2018
Location: MA
Posts: 469
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About the most sensible thing I've seen here.
About density altitude being sarcastic? Pretty smart reply followed by an ignorant response, IMO. |
02-22-2019, 08:25 AM | #37 | |
BAMF SS
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Quote:
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2016 1SS A8: FBO + Circle D + P1X + Meth + Tuned by Pray Performance
Stock Longblock 800 SAE rwhp. 9.4 @ 145 mph. |
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02-22-2019, 08:40 AM | #38 |
Drives: 2016 Camaro 2SS Join Date: Apr 2017
Location: Stansbury Park, Utah
Posts: 1,092
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When I was NA...I could definitely feel a difference. My local track is 4500'. if it's 40 degrees outside, I run 12.4. If it's 100, I run 13.1. So yes, you can feel that difference. The DA will vary from 4000-8000+ depending on the temperature.
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02-22-2019, 10:07 AM | #39 |
Drives: 50th SS Convertible Join Date: Jul 2017
Location: Swanton, Ohio
Posts: 103
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There is more going on than just colder denser air, which changes the combustion and should have an effect on output of the engine. However the ability to keep the engine cooler changes how well the components and lubrication works as well. Just remember starting your cold engine when solid lifter were common and how rough they ran until the engine gain some temperature.
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