60 foot time vs ET

driller

driller

El Presidente
Staff member
A lot has been said before of the particular importance of the sixty foot time and how it impacts yout 1/4 mile ET. This can be clearly seen in the following analysis. :)

I took all the timeslips from this year's logs and plotted the 60 ft times vs. the 1/4 mile ET. The results were extremely evident. In the simplest of analysis, the slope of the linear relationship was 1:3.96! In other words every 1 tenth of a second in the sixty foot was equivalent to 4 tenths of a second in the 1/4 mile ET.

I have previously heard of 2 to 3 tenths in the 1/4 mile for every tenth in the sixty foot and was suprised it was actually almost 4 tenths. The average deviation was about 0.07 which meant the average tenth in the sixty foot was equivalent to 3.3 to 4.7 tenths in the ET.

The most close fitting curve to the plotted results was a sinsusoidal fit defined as y=a+b*cos(c*x+d). In layman terms that simply implies the curve tapers off at each end rather than a linear slope extending infinitely above and below the plotted range of data.

The data is shown in the attached graph. Your results may vary. ;)
 

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I heard of 2 to 3 tenths in the 1/4 mile for every tenth in the sixty foot too, but it may vary by car. Nevertheless cool plot and math.
 
Nearly 4 tenths seems a little steep to me, I usually think more along the lines of a 1:2 ratio, but interesting plotting regardless. I am often proven wrong. :)
 
Devin said:
Nearly 4 tenths seems a little steep to me...
Click to expand...

It may be for you. You would have to determine your own results with your car. For me there is also 7 hundredths of a second variance, which seems a bit high. But this could well be a variable due to track conditions and where I stage in the beams.

FWIW, I could find no other significant and repetitive contribution to the ET other than the obvious correlation to the 60' times. This led me to investigate further and analyze the numbers.

As general rules go, you can't argue with the math. :)
 
The 60ft to ET ratio changes by how much power you produce and how heavy the car is. For most "real" race cars the 60ft ratio is between .01 : .01 and .01 : .016.
The heavier the car the more the ratio can be expanded. Momentum is very important and a heavy car needs all the help it can get.

You should do some statistical work for me, my Crew Chief Software already does quite a bit of it. Most math professors don't understand drag racing physics so getting them to understand all the variables is very difficult. A drag racer who understands statistical analysis is what I am looking for.

My 1100 HP dragster is about .01 : .014 in ET.
 
No doubt in a lighter, faster 'race car' the ratio would be much, much less. The Mark VIII takes a LOT of momentum to get it moving. That's one reason I have 4.30s. I would have 4.56s if it were a dedicated track car.

crewchiefpro said:
You should do some statistical work for me, my Crew Chief Software already does quite a bit of it. Most math professors don't understand drag racing physics so getting them to understand all the variables is very difficult. A drag racer who understands statistical analysis is what I am looking for.
Click to expand...

I actually love statistical analysis and physics. LOL, what's the job pay? :D
 
Actually I might require you to test some data. I would like to have a different person examine race times from some of my customers to see if your answer is different/better than my analysis.

I worked on my new Pro 7.0 version for over 2 years refining the prediction logic but there is always room for improvement. It may be worth a few hundred dollars, and if you find something interesting that would help the program possibly more.
 
Shoot, if there's no time deadline, I'd likely do it for fun (or a discount on your software). :)

I log virtually everything anytime I'm at the track. I use Excel, CurveExpert and sometimes even MathCad to look at my slow numbers along with a refined sense of logic and scientific curiosity. Shoot me a PM or email with what you'd like to see examined. ;)
 
As I said before Dons software looks like some really good stuff. I wish I could afford it and his wifes car!
 
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