Converting 1/8 to 1/4 mile times

[12secondv6]

I don't know if this is true but I found this at http://www.ls1.com/forums/
I was wandering in the drag racing section and one of the guys (moderator) posted a conversion
There is no perfect method for all cars, but this should put you in the ballpark..

1/8 mile ET X 1.545 = 1/4 mile ET

1/8 mile trap speed X 1.25 = 1/4 mile trap speed
So just for the hell of it I tried it with a timeslip in my sig
Keep in mind these are on the bottle
1/8 mile 8.195 x 1.545 = 12.661 estimated
Real et was .............12.863
1/8 mile 83.75 x 1.25 = 104.69 estimated
Real mph was............104.91
We know nitrous generates a lot of torque so that might explain the difference in et but I hope this helps.

[Dominic]

Well then my 1/8 mile is a really awesome 1/4

9.71 * 1.545 = 15.00
72mph * 1.25 = 90MPH

I'm just doin awesome [img]smile.gif[/img]

[RedbirdV6]

That method puts you in the ball park, but out in left field ;) I have the conversion chart in my NHRA tech books. I will find them and post them. No method of conversion will be perfect because of different car types and mods but they get you close and are always a little fast :D

[Dominic]

The only other conversion site I know of is here
http://www.midwaydragstrip.com/conversion_page.htm

[Infernal]

Cool, my 1/4 is 14.83. [img]smile.gif[/img]

Unfortunately its only 15.19... Doh

[Magnus]

We wuld need our own multiplication factors. Our cars act differently than LS1's. They have great top end while ours is not so great.

[Bene]

<blockquote>quote:</font><hr>Originally posted by Magnus:
We wuld need our own multiplication factors. Our cars act differently than LS1's. They have great top end while ours is not so great.<hr></blockquote>

I agree. Our 3.8s falls on its *** on 4th gear top end. [img]tongue.gif[/img] Atleast thats what happens on my T~5. No more big ummph pull. [img]graemlins/crybaby.gif[/img]

[Dominic]

<blockquote>quote:</font><hr>Originally posted by bene:


I agree. Our 3.8s falls on its *** on 4th gear top end. [img]tongue.gif[/img] Atleast thats what happens on my T~5. No more big ummph pull. [img]graemlins/crybaby.gif[/img] <hr></blockquote>

Thats because youre running 1:1 with 3.23's in the rear.

Many of us automatics still have 3.42:1 reduction in the rear when our tranny is at 1:1 - which helps us along quite nicely [img]smile.gif[/img] .

[MustangEater8251]

With my fastest, 1/8th mile, it gives me a 15.650, thats tied for the fastest N/A 3.4L camaro, and 1st, for fastest N/A 3.4L on street tires.

Too bad it drizzled that day and they stopped the 1/4 and switched to the 1.8th. :(

[ January 26, 2002: Message edited by: MustangEater8251 ]</p>