Fastbird

iTrader: (5)

Does anyone know if there is a chart somewhere that can convert 1/8th mile times to 1/4 mile times? I ran a 8.8 in the 1/8th and want to know what it would be in the 1/4.

Thanks

Steve

88 427 Camaro

Approximately 1.5 times your 1/8 mile time.

Miles

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88 427 Camaro
12.18 @ 113mph 1.75 60ft
http://www.geocities.com/MotorCity/Track/5604/

AlkyIROC

Multiply by 1.55 and add about a tenth is closer for my ET's. There is no real formula to convert it. There are too many variables in the last 1/8 mile to get an accurate conversion. Any formula available would only give a best guess conversion.

Three of my runs this year 1/8 and 1/4

7.601/11.894
7.710/11.954
7.604/11.857

Your 8.8 would probably be around 13.7's in the 1/4.

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Stephen's racing page

87 IROC-Z Pro ET Bracket Race Car and knocking on the SuperPro ET class
383 stroker (carbed) with double hump cast iron heads and pump gas
LS6 Big Block buildup now in progress

Best results before the engine blew up
Best ET on a time slip: 11.857
Best corrected ET: 11.163
Best MPH on a time slip: 117.87
Best corrected MPH: 126.10
Best 60 foot: 1.662

Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!

Member of the Calgary Drag Racing Association

doc

I had a big interest in this too because I run at both a 1/8 mile and 1/4 mile dragstrips.

Being into math and other ugly things, I developed a formula that is very accurate for my '87 with mods. The 1.5 formula is not very good, but OK if thats all you got. My formula is:

1/4 mile ET = -0.3730 * (60' time) plus
1.3613 * (1/8 mile ET) plus 2.5747

I know its complicated, but it works great.


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'87 L98 TPI IROCZ, AFR190 heads, 3.70 gears, ZZ9 cam, 2400 Art Carr TC, SLP 1 3/4" headers, SLP cat-back, no cat, no AC, no MAF screens, Accel manifold base & SuperRam, Edelbrock double roller timing chain, MSD ext coil & distributor, trans cooler, 52mm TB with airfoil, TB coolant bypass, AFPR(48psi), K&N filters, Hotchkis lowering springs, Car-Pro custom chip, Lay Ind. ram air kit, 265/45R16 Kumho V700 tires.
ET 13.39sec @ 107.21mph
'90 Eagle Talon AWD, no rust thru 9 winters
'99 Camaro SS, red, 6-spd, T-tops, Mcleod clutch, Pro 5.0 shifter, MAF processor, Direct Flow airlid, K&N filter.
313.7Hp & 320.6ft-lbf, ET 13.55sec @ 105.1mph
next mod: 4.10 rear gears

AlkyIROC

hmmmm. didn't work for my best time.

-0.373 * 1.667 = -0.621791
1.3613 * 7.604 = 10.351325
2.5747 = 2.5747

Total is 12.304 and I ran a 11.857. Multiplying the 7.604 1/8 mile time by 1.56 will give me 11.862. Much closer.