I raced a guy that I worked with tonight in his Civic, that is stripped down to about 2400 pounds. But anyway, we raced and were dead even till about 80 where we had to slow down for traffic. Earlier he showed me a one of his time slips from a local 1/8 mile track and he ran a 10.1. My question is, does anyone know what kinda 1/4 mile time that might equate to? Approximately

 

Not totally sure but I would say in the 15 sec. range. I'm sure someone knows exactly to help you out more.

 

it all depends on other stuff, I hit 10s when I pass the 1/8.
I beat a turbo talon to the 1/8 (I had a good launch), but he ended up beating me in the 1/4 by .9, go figure.

 

a 10.1 1.8th mile time equates to approx. 15.4-15.7 depending on ur 60' time and ur mile per hour in the end.. my bro has a TA and in the eight he ran 9.8, in the quarter it was 15.4..

 

as a general rule 1/4mile time = (1.55) 1/8 mile time

 

thatz a very very rought estimate though, it'll give u an idea of ur time but will be off, sometimes farther than others.. plus it really depends on the car, some cars have amazing top end and will be faster and in some cases its all low end power and run out of breath at the far end which will severely hurt there ET..

 

I use 1.56 as a conversion number. Neither are 100% accurate. I suppose the 1.55 number would be better to use. It will usually give a much quicker time than what you will run. If you had to dial-in to the next round but didn't make a full pass then using the 1.55 number will give you a time so you won't break out.

Looking at a time slip here I ran 7.375 at the 1/8 and 11.489 in the 1/4. Using the 1.55 calculation I should have run 11.43 and the 1.56 calculation I should have run 11.50. The 1.56 gives a closer conversion number however if I used it to dial-in, I would have broken out.

All my timeslips show the same results. 1.55 says I should have gone faster and 1.56 is just a bit slower than what I actually ran.

You make your own assumptions as to what works best. If you only run 1/8 mile and choose the 1.56 number then when you actually get to a 1/4 mile track you can expect to run a bit quicker than you hoped.