What chart?

 

The conversion on average is .2 slow on the E.T. but within a couple MPH. This is with the Wallace calculator.

 

Mine is within .1 using the old school math.
1/8 mile ET x 1.57

 

With using this formula We are also within .1

 

Multiply 1/8 mile by 1.58 and it will be very close to your 1/4 mile et.

 

1.57 is real close for my car

 

1.57 is dead on here also.

 

My car thinks it's a turbo car, 5.94@117 and 9.14-5 @148-150
Catches a few playing games by surprise

 

I played around with that calculator just now by typing in my 1/8th mile timeslips into it. According to the calculator, my 1/4 mile times are slower than what the actual timeslips showed (based on my 1/8th mile times).

Wallace:

1/8 - 7.682 @ 92.75
1/4 - 12.06 @ 115.01

Actual:

1/8 - 7.682 @ 92.75
1/4 - 11.824 @ 120.44

Wallace:

1/8 - 7.419 @ 94.68
1/4 - 11.66 @ 117.40

Actual:
7.419 @ 94.68
1/4 - 11.492 @ 121.86

Wallace:

1/8 - 7.643 @ 92.64
1/4 - 12.00 @ 114.87

Actual:

1/8 - 7.643 @ 92.64
1/4 - 11.797 @ 120.09

 

There is a chart?

 

No, there is no chart. You have to click onto the link below and enter in your 1/8th mile ET and MPH. Their calculator will estimate what your car would run in the quarter mile. This is great for people who only have an 1/8th mile track where they race. It's not perfect but it's fairly close.


http://www.wallaceracing.com/8th-quarter.php

 

With 1.58 its 1\2 a 10th off on mine.i call that dead on but my buddys car its way off.his car is lazy in 1\8 but mph and e.t big time on top end in 1\4 mile

 

Way off on our car. 1.54 seems to work the best.

 

1.54 is pretty dead on.

 

1.56 ratio 5.7891/8 9.04 1/4

 

Really depends on the combo. Most weekly bracket cars should be close at 1/8th mile x 1.57.

For my car 1.565 x 1/8th is usually within .01.

Ran 4.187 - 6.562
4.187 x 1.565 = 6.552

Pass week before 4.2188 - 6.6006
4.2188 x 1.565 = 6.6020

 

Most of us oldtimers carry around this chart.

http://cochise.uia.net/pkelley2/eight-to-quarter.htm

 

Nope mine is 2-5 tenths off. But that is because was something wrong the motor

 

Different combo's, different equations, agreed. Does anyone have the plug-in numbers for N/A, boosted, N2o combo's? I only have one of 'em memorized.

 

Less than a tenth with my top dragster.

 

I run low 5.20's in 1/8. Most of the conversion charts say I should be running 8.10's in quarter but I run 8.30's. Not sure what that is telling me. Charts are wrong or my setup is not working as well in quarter?

 

I am running low 5.20s as well in 1/8th but 8.02 best in 1/4

cheers Richie

 

i just finished my car this fall and only made it to a 1/4 mile test n tune and then an 1/8 mile race. the converter i used is way too tight and barely stalls at all. the car kept running quicker the more i ran it. on thursdays test n tune it went 7.27 in the 1/8 and 11.35 in the 1/4, then by sunday it was running 7.13 in the 1/8. anyway multiplying the 7.27 by 1.56 was almost spot on for my run, so i used it to figure out i probably would of been running 11.12 in 1/4 on sunday which would of been close to my 10 sec. goal.

 

x1.57 is dead on for me

8.00/12.56

&

6.60/10.36

I run 1/8 all year in both cars. Then in Indy (ET Finals), I run 1/4 in Sportsman and have ran 12.56.
The only two 1/4 passes in my S/P car were 10.36 & 10.38.

Dead on.

 

1.58 is pretty dead on for my car...on the charts the 1/4 mile side usually is a bit optimistic...

 

http://cochise.uia.net/pkelley2/eight-to-quarter.htm

 

Dammit.... I typed my 1/8th mile ET and mph ..... when I hit calculate its said ......"you know it will kick the rods out before it gets that far dummy"

 

Shit, I thought I was the only one!

 

1.572 seems to be the multiplier for my bracket car

6.67 1/8 to a 10.49 1/4

 

X 1.56 for me and is dead on.