eighth mile to quarter mile conversion question
 

since my local quarter mile track has shut down for the year i have been going to
some eighth mile tracks. my car ran a 1.78 60 foot/ 7.21 at 103 mph.could anyone with experience drag racing hondas give me a close estimate on my quarter mile time

Re: eighth mile to quarter mile conversion question (speedworks)
 

dman whats ur car got.....im not an expert or anything but im sayin low 12's

Re: eighth mile to quarter mile conversion question (On Point)
 

its way to hard to say, all cars are different.. A supra that does a 7.2 1/8 could possibly break 10's.. but a Mustang GT w/ Nos or sumthin may run low 12's... Id like to guess u r inbetween, somewhere in the 11's..

Re: eighth mile to quarter mile conversion question (On Point)
 

car has a 2.3 v-tec running a fully upgraded t3/t4e. it has allready been 11.87
running very bad. car runs great now so it should be much faster than this.

Re: eighth mile to quarter mile conversion question (speedworks)
 

This has nothing to do with your question but I wanted to add a formula I use to find out whp by using ET and trap speeds. Its not 100% accurate but it sometimes comes out close.

(MPH^2 / ET) * (total weight/1000) / 9.1 = Horsepower to the wheels.

Re: eighth mile to quarter mile conversion question (speedworks)
 

my car did 8.10 1/8 mile and 12.51 1/4 mile.yours should be deep in the 11's easy.

Re: eighth mile to quarter mile conversion question (Arturbo)
 

Art I tried that formula and it did not work to well.. I plugged in the total weight of my car as 2900(eduacated estimate) when I ran it, and came out with 143.9whp.. theres no way thats possible.. Im gonna find some statistics and see if i can come up with a formula..

(85^2/16.0) * (app. 2900/1000) / 9.1 = 143.9 is what i got.. it should be about 110-115 in a LS w/ IE and 17's..


[Modified by DIRep972, 2:36 AM 10/8/2001]

Re: eighth mile to quarter mile conversion question (speedworks)
 

This is a rough estimate, but is usually very close.
For those of you who have a timeslip with both 660' and 1320' times and speeds, give it a try and see. The only cars I've seen a with big variance in this guestimate is AWD cars. They usually have much better 1/8 mile times and slower than expected in the quarter mile due to the better than average 60' times. For those cars, the ".65" in the formula is usually modified to a .62 to .64 or so.
1/4 mile to 1/8 mile e.t. conversion:
1/4 e.t. * .65 = 1/8 e.t.

1/4 mile mph to 1/8 mile mph conversion:
1/4 mph * .8 = 1/8 mph

so...

1/8 mile to 1/4 mile e.t. conversion:
1/8 e.t. / .65 = 1/4 e.t.

1/8 mile mph to 1/4 mile mph conversion:
1/8 mph / .8 = 1/4 mph

From this, I'd guess you'd pull a 11.092 @ 128.75 mph in the 1/4!
That's an awesome ride speedworks! Congrats!