hlh0501

iTrader: (1)

I know there is no way to know.. but i am running in a import shootout in a week... just curious,

if a maxima runs a 14.3, it should be approx 9.0 in the 1/8th ?
and a 14.0 would be in the 8's, yeah?

plus I have VLSD. should help..

any guesses?

ptatohed

iTrader: (12)

I posted this question once and not one fricken answer from anyone. So I did my own homework. Now, I am glad to help answer this for people like you hlh. The approximate rule of thumb for 1/8 --> 1/4 and vice-versa is folowing:

1/4 E.T. = 1.57 x 1/8 E.T.
-and-
1/8 E.T. = 1/4 E.T. / 1.57

Therefor, figure your 1/8 examples to be ~ 14.3/1.57 = 9.1 and 14.0/1.57 = 8.9

ptatohed

iTrader: (12)

You're welcome.

JMAXIMA

maybe my car is different, but since i ran a 15.2 1/4 and a 9.8 1/8, this equation doesn't work for me. i would either have a 15.4 or a 9.6. .02 of a second in both directions

Jamsan

iTrader: (2)

your car obviously picks up more when you get higher speeds....

KINGMAX

He has a pop charger, that might be why.

ptatohed

iTrader: (12)

Yeah, not sure what to tell you Jmax. I read the equation in several places. I know it is approximate but I would hope it isn't 2/10 off! Anyway, here is one site w/ some useful conversions (including the one I listed above for 1/8 --> to 1/4):

http://members.tripod.com/~MY5LTRLXCPE/math.html

And try this one for a 1/8 --> 1/4 chart/table:

http://www.midwaydragstrip.com/conversion_page.htm

In fact, the table gives you a 15.39 in the 1/4 with your 9.8 1/8 so it follows the formula pretty close. Not sure what to tell you.

Nealoc187

iTrader: (23)

1.55-1.57 is the accepted conversion for 1/4 mile to 1/8th mile times. Try the 1.55 number. If your numbers differ significantly its because your car has an extremely odd power curve or gearing, or because there was a significant flaw in your run. I just ran some of my times through the formula again, and its within .05 seconds on all of them. For example my best run of 14.41 had a 1/8 of 9.300. 1.55x9.300=14.415.

ptatohed

iTrader: (12)

It sounds like 1.55 is a better number to use then. It works out near-perfectly for neal and jmax.

JMAXIMA

i'm not too concerned, i was just adding my $.02. the funny thing though is that my best 1/8 and my best 1/4 that night were on the same run. the only thing i can think of is that my clutch is slipping really bad on my 1st - 2nd shift. maybe that explains my poor 1/8 time... and then i was able to make up some time later in the run??