TexasRedLT4
Member
Adjustments to 1/4 mile times?
Browsing through this forum I've seen some awfully impressive 1/4 mile times run with LT4 Vettes, and have also read an interesting post on the variation of HP output of LT4 engines.
I'm looking for information on the typical adjustments you would see in quarter mile times due to air temperature, elevation etc. I know that the magazines typically adjust their recorded times to sea level and 70 degrees F (?) using a pretty complex formula that also includes atmospheric pressure etc.
When I lived out in West Texas I took my LT4 Vette down to the local drag strip one time for what they called a "test & tune" (basically unlimited runs against whoever was pulled up next to you). I had a lot of people wanting to race me and won most of them (except for the true hot rods - one guy ran a 10 sec qtr against me), but I was a little disappointed in the numbers I ran and have always been curious about the impact of less than ideal conditions. My best run was 14.0867 seconds at 99.62 mph. I know I was hampered by the following conditions:
Browsing through this forum I've seen some awfully impressive 1/4 mile times run with LT4 Vettes, and have also read an interesting post on the variation of HP output of LT4 engines.
I'm looking for information on the typical adjustments you would see in quarter mile times due to air temperature, elevation etc. I know that the magazines typically adjust their recorded times to sea level and 70 degrees F (?) using a pretty complex formula that also includes atmospheric pressure etc.
When I lived out in West Texas I took my LT4 Vette down to the local drag strip one time for what they called a "test & tune" (basically unlimited runs against whoever was pulled up next to you). I had a lot of people wanting to race me and won most of them (except for the true hot rods - one guy ran a 10 sec qtr against me), but I was a little disappointed in the numbers I ran and have always been curious about the impact of less than ideal conditions. My best run was 14.0867 seconds at 99.62 mph. I know I was hampered by the following conditions:
- elevation - 2700 ft above sea level
- approx. 90 degrees F outside air temperature
- running on Goodyear runflat tires (that were about to be replaced)
- less than ideal track conditions (i.e., West Texas is always dry, dusty, and windy; therefore track surface probably wasn't the best for traction)