Heat and ETs
Thread Starter
Instructor
Joined: Jul 2001
Posts: 231
Likes: 0
Heat and ETs
Does the heat affect an A4 or MN6 the most? At the track a couple of weeks ago, my ET fell off by .4 while friends with MN6 only lost .2
Is there a rule of thumb for horsepower/ET and temperature?
Is there a rule of thumb for horsepower/ET and temperature?
Burning Brakes
Joined: Apr 2002
Posts: 798
Likes: 0
From: Manchester NH
Re: Heat and ETs (Mystery Fan)
I would reformulate your theory on a larger pool of tests, given that it seems you've drawn a conclusion based on two cars and two visits to the track. I would actually expect the opposite of what you observed, since traction seems to be a bigger issue with the MN6 than with the A4. I am willing to bet temperature has at least as big an effect on traction as it does on power.
Were your better times in hotter or colder weather, and what were the temps?
-Pete
Were your better times in hotter or colder weather, and what were the temps?
-Pete
Thread Starter
Instructor
Joined: Jul 2001
Posts: 231
Likes: 0
Re: Heat and ETs (pburant)
In 60 degree weather, I was running 12.5, the MN6 guys were running 12.2. In 85 degree weather, I was running 12.9, the MN6 guys were running 12.4
We all had on nitto drag radials.
We all had on nitto drag radials.
Drifting
Joined: Apr 1999
Posts: 1,343
Likes: 4
From: Saratoga Spgs, NY 12866 NY
Re: Heat and ETs (Mystery Fan)
I makes sense if you think about it. As the temps go up horsepower drops but traction increases. Hot tire and hot track surface makes for harder launches. A manual trans car can make better use of high traction conditions. On a sticky track, haw about a 5000 rpm clutch drop :eek: An auto can only build to stall before launch. Also, a car with a cold air intake box, like vortex, will lose more HP with increasine temp, also. Giving up some of it's gains to an under the hood type system.
Le Mans Master
Joined: Mar 2002
Posts: 6,885
Likes: 2
From: Corpus Christi TX
Re: Heat and ETs (Mystery Fan)
a hot track is not always a good thing; if you get too much heat, oils can rise to the surface causing less traction. Go to an NHRA event in a hot climate location and you'll see them occasionally scraping the first 60ft or so where the majority of the rubber is being laid. Too much heat and rubber will lead to spins out of the box.
As far as weather, it plays a HUGE roll in the cars overall ET and trap speed mph. In nice, dry, high baramoter, 55 degree weather, my Z06 was trapping 116+ with EASE. In muggy, low baram, 85 degree weather, my Z06 was struggling to trap 114. It plays a large role.
Here's a neat "density altitude" calculator that I try to keep track of. If it's a +900 foot day here in Houston, I'm probably looking at 114 traps. On the other hand, if it's a -900ft day (which are rare here, only in winter), then the 117 traps will be possible.
http://rshelq.home.sprynet.com/calc_da.htm
unfortunately, it's gonna be a long, hot summer before I see good conditions down here next fall
:smash:
As far as weather, it plays a HUGE roll in the cars overall ET and trap speed mph. In nice, dry, high baramoter, 55 degree weather, my Z06 was trapping 116+ with EASE. In muggy, low baram, 85 degree weather, my Z06 was struggling to trap 114. It plays a large role.
Here's a neat "density altitude" calculator that I try to keep track of. If it's a +900 foot day here in Houston, I'm probably looking at 114 traps. On the other hand, if it's a -900ft day (which are rare here, only in winter), then the 117 traps will be possible.
http://rshelq.home.sprynet.com/calc_da.htm
unfortunately, it's gonna be a long, hot summer before I see good conditions down here next fall
:smash:
Thread Starter
Instructor
Joined: Jul 2001
Posts: 231
Likes: 0
Re: Heat and ETs (BLU-BY-U)
I just ran the density altitude numbers. When my time went down the density altitude was +2,130ft, on my best run the density altitude was -1,100ft. That and the traction issue of a warm track makes sense,
Thanks
Thanks
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski