I got this off the internet how close is this...

[TOMMY]

Formula for 1/4 mile ET -------> (1/8 mile ET + .22) Divide by .655

My best pass was a 7.05 = 11.09 in the 1/4

So if thats accurate it would take 6.98 to run a 10.99 in the 1/4

I'm just trying to figure out how deep in the 6's I have to go to be in the 10's in the 1/4


Tommy

[musclestang89]

thats about right, I broke into the 10's with a 7.0 myself, even ran a 10.83 wih a 7.0. But I think I have about 5 more mph than you in the 1/8. Yours just cuts alot better of a 60ft than mine does.

[Unseen]

Most folks I see multiply 1/8 time by 1.55 to 1.57 to get 1/4 time.

[TOMMY]

Most folks I see multiply 1/8 time by 1.55 to 1.57 to get 1/4 time.

OK, 7.05 x 1.55 = 10.92
" x 1.56 = 10.99
" x 1.57 = 11.06 <----- I think I'm closer to this

[Phoenix383]

Most folks I see multiply 1/8 time by 1.55 to 1.57 to get 1/4 time.

Yes thats about right it varies with cars weight and gearing but it is a good close estimate.

My firebird at 3760 went 6.85 1/8 and 10.69 1/4 so 1.55 = 10.6175, 1.56 = 10.686, 1.57 = 10.7545.

I think if the car is running good then 1.55 is best. the bird was on MT sportsman pros and spun a little on launch and it was in July track wa 112. so conditions were not optimal for a great run heavy car.

1.56 for a heavy var over 3200 is a good safe bet and 1.55 is safe for 3200 below for an estimate and conservative. imo

[Unseen]

For example,

A turbo car will run faster in the back half, more mph, use 1.55 as the factor.

N/A car would use 1.57.

They are just estimates.

[TOMMY]

Yes thats about right it varies with cars weight and gearing but it is a good close estimate.

My firebird at 3760 went 6.85 1/8 and 10.69 1/4 so 1.55 = 10.6175, 1.56 = 10.686, 1.57 = 10.7545.

I think if the car is running good then 1.55 is best. the bird was on MT sportsman pros and spun a little on launch and it was in July track wa 112. so conditions were not optimal for a great run heavy car.

1.56 for a heavy var over 3200 is a good safe bet and 1.55 is safe for 3200 below for an estimate and conservative. imo

Ok, if your right I'm in the 10's then. The car has to weigh 2800#'s or less
So that puts me at 10.92 in 1/4

[TOMMY]

Well I just need to make a 1/4 mile pass. I just figured if i broke the 6's that would equal 10's in the 1/4. We will see sooner or later

[SNEAKY]

get a cage :D

[STROKD]

It depends on the car, My Stang when it was blown was * 1.53, and the Vette all stock but seriously aerodynamic is 1.53 also... ;)

Freeway cars... :o

[White90GT]

1.57 has always worked for me n/a and on nitrous.
n/a timeslip:
1.67 sixty foot
7.50@92 1/8
11.763@115.48 1/4

7.50*1.57=11.775

nitrous timeslip:
1.59 sixty foot (spun a bunch)
6.895@101.19 1/8 mile
10.803@125.44 1/4 mile

6.895*1.57=10.825

The nitrous timeslip conversion is a little off due to lack of traction. It normally cut high 1.4x-1.51 on the sixty foot on the bottle.

[TOMMY]

get a cage :D


I know :)

[lee earley]

here is a chart also... http://home.att.net/~lsmctx/conversion.htm

[purple piston eater]

I like to play with the drag performance calculator on the richmoundgear site
someone link it ....

[TOMMY]

here is a chart also... http://home.att.net/~lsmctx/conversion.htm

thanks :cool:

[sDun]

Cool, with the old little motor combo that was a 8.86 in the 1/4 using 1.55.

[SSMAN]

This is in the ball park too....


http://www.allfordmustangs.com/Detailed/638.shtml