[FlukeSS]

Talking to my tuner, and we were discussing my trap speed. The one time I hit a 120mph trap speed.

He mentioned the corrected time would be 11.8 - 11.9, but the slip I have says 12.289 (I had a bad launch with this time)

What exactly is corrected time and what is the significance and circumstances around it?

[danhr]

Originally Posted by FlukeSS

Talking to my tuner, and we were discussing my trap speed. The one time I hit a 120mph trap speed.

He mentioned the corrected time would be 11.8 - 11.9, but the slip I have says 12.289 (I had a bad launch with this time)

What exactly is corrected time and what is the significance and circumstances around it?

Probably trying to "correct" for DA.

[ember1205]

My understanding is that corrected time is sort of like the reference point to measure all times against. It will take into account things like temperature, elevation of the track, and other factors to adjust your -actual- time and speed back to that reference point (if your car were running in "ideal conditions"). If you correct all times, you should be able to determine if, on any given day/run, your car is performing at, better than, or worse than the way it should perform under perfect conditions.

This is a copy/paste of a post I found that does a really good job of telling you how to calculate the corrected time:

1) Find out the elevation of your track. Use a good search engine and you should be able to find it.

2) Go to www.wunderground.com and find the city where your track is. Once you've located your area, you can dig up historic weather conditions for any day in the past 10 years. You'll want to get the temp, baro pressure, and dew point of the time and date of your run.

3) Go to http://wahiduddin.net/calc/calc_hp_dp.htm and input your numbers. Hit the calculate button and locate the calculated Density Altitude. The DA number generated is the calculated theoretical altitude during you run.

4) Take your DA number and apply to the NHRA correction factors table http://www.gnttype.org/techarea/misc/altitude.html

5) Calculate your numbers and that is what your car should have run under ideal conditions. Sometimes your DA actually shows NEGATIVE altitude which means the car is performing far better than normal and there's nothing to correct and compensate for. Usually only coastal areas in the South, East Coast, and Northeast will experience these rare conditions thanks to low altitude and strong high pressure areas due to the proximity of the ocean (~400 miles). It's also a primary reason most of the "freak" cars reside in these regions.

[CamaroDreams76]

Your tuner is correct. 120 trap speed is around that time. As many said corrected time could be for DA. Also could be corrected for trap speed.

I know some cars will spin off the line and still trap high which means with a good launch, this trap speed usually equates to this time.

[laynlo15]

You can correct all you want but the track et or mph is what you get. Don't fall into the corrected trap, if you race in the spring, summer and fall as I do you'll get a full gamet of ETs and MPH. I've run in DAs of Zero up to 4500 and there is a huge difference in how your car will perform. Just take the ET and Mph for that day and live with it. I ran last weekend and had a full range of temps, water grains and DA. Thursday the car ran 9.94 and 9.95 at over 141 mph. Friday about the same, we got into Saturday morning and and had to slow the car down to qualify on a 10.00 index with a 10.06@127, let off about 1200 ft of the 1320. The after noon changed dramatically with temps around 80 degrees, water grains close to 100 and DA was about 2500. The car slowed down to a 10.07@141, the problem with drag racing in the heat is that your car typically gets heat soaked in the staging lanes which mine did and all my Et lose occurred in the 1/8 mile and picked up on the back half and actually ran over 141 mph again. My point is don't worry about the corrected ETs because you think your car ran slow, thats what you get that day and wait for cooler temps and you'll get those better ETs and MPH.

[FlukeSS]

Originally Posted by laynlo15

You can correct all you want but the track et or mph is what you get. Don't fall into the corrected trap, if you race in the spring, summer and fall as I do you'll get a full gamet of ETs and MPH. I've run in DAs of Zero up to 4500 and there is a huge difference in how your car will perform. Just take the ET and Mph for that day and live with it. I ran last weekend and had a full range of temps, water grains and DA. Thursday the car ran 9.94 and 9.95 at over 141 mph. Friday about the same, we got into Saturday morning and and had to slow the car down to qualify on a 10.00 index with a 10.06@127, let off about 1200 ft of the 1320. The after noon changed dramatically with temps around 80 degrees, water grains close to 100 and DA was about 2500. The car slowed down to a 10.07@141, the problem with drag racing in the heat is that your car typically gets heat soaked in the staging lanes which mine did and all my Et lose occurred in the 1/8 mile and picked up on the back half and actually ran over 141 mph again. My point is don't worry about the corrected ETs because you think your car ran slow, thats what you get that day and wait for cooler temps and you'll get those better ETs and MPH.

My Traps do range usually between 116-118 on the regular 305 street tire, just the one time I hit a 120 trap with a piss poor 60ft, not sure how or why that happened or even if the track slip is correct, seemed far fetched considering what I normally get. DA was about 2300-2400 temp was about 77-82 degrees with 71% humidity when I trapped 120 on the street tire.

But several people on here, and tuners I've talked to tell me with ideal tires and conditions I should be trapping 120-125 give or take.

The last time at the strip, temp was 67 degrees DA around 1150, and granted I was on 93 not 85 ran 12.191-12.251. Only running 93 for now until the intake and TB get installed and car gets retuned which should be tomorrow. Tuner said I should have been about 11.8 to 11.9 @ 122-123mph corrected with that last time at the strip.