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Old 11-14-2003, 01:01 PM
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How to get 1/4 mile times from 1/8 mile.

If you are like me and have a local 1/8 mile track but the nearest 1/4 is a little bit far away. There is a very simple way to figure out what your 1/4 mile time would be. THIS IS NOT EXACT, but i have tested it, and its close. All you need to do is take th 1/8 mile et and mulitiply it by 1.56. example: 1/8 et=8.5
8.5X1.56=13.26. AS i said its not exact, but give you an idea.

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Old 11-14-2003, 02:23 PM
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Arn't there a lot of things to take into consideration when doing the math for 1/4 mile times?? Rear gearing and trans gears and how many 2-3-4-5-6 speed trans gear changes??? RPM at 1/8 mile and at the end of the 1/4? I never heard the 1.56 multiplication thing, but I never looked very hard either. Maybe it just looks to oversimplify everything to me?? I will not hesitate to say you are wrong, but it does seem to simple to me. Then again, they do call it Bench racing, don't they!!! LOL



Todd



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Old 11-14-2003, 02:37 PM
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Yeah everything you said you have to take into consideration but, like i said this is just a basic way to figure it out, its fairly close either way, at least it was with my car, and i have heard of other guys going from this. But i totally agree it is oversimplified.
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Old 11-15-2003, 03:25 PM
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According to the NHRA rulebook 1/8th mile times are converted to 1/4 times by multiplying your 1/8th mile times by 1.555.
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Old 11-15-2003, 04:14 PM
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I guess they rounded that up??
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Old 11-15-2003, 07:26 PM
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Quote:
Originally posted by Grusome Goat
According to the NHRA rulebook 1/8th mile times are converted to 1/4 times by multiplying your 1/8th mile times by 1.555.


that means Im running 11.196 in the 1/4 hmmmm...not 10,s but close.... (just wait till I use some spray!!!) 250hp shot should put me solidly in the 10's.....
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Old 11-17-2003, 10:49 PM
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you might be you never know, like he said its kinda broad. the .1 im sure you could make up with some good 60 foot times or if you have good gears, i dunno what kinda 60 they figured in for the 1.555 thing
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Old 11-18-2003, 11:35 PM
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Well I don't know how NHRA figured it but IHRA uses the same formula. Have know idea how they figured 60ft times into it, or if they did. I know my 60 fts have varied due to different tracks have different preparation techniques, but my et's in the eighth have fairly consistant as long as it's not too slick.
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