Anyone tell me how to calculate this? Say I ran a 7.599

 

1/8th X 1.56 = 1/4

7.599 X 1.56 = 11.854

I have no clue how to calculate the MPH though.

 

1/8th MPH x 1.23= 1/4 MPH

Actually 1.54 to 1.57 and 1.23 to 1.25 is the range for most street vehicles. I have found that on a given vehicle if you go to a 1/4 mile track and get a timeslip you can divide the 1/4 numbers by the 1/8th numbers and whatever that comes out to you can use that from then on to convert 1/8th mile times for that vehicle.

For instance my truck usually comes out around 1.565 for the ET and 1.235 for the MPH. I had a Mustang that was 1.543 and 1.25.....but the numbers posted here should get you pretty close.

 

I say you should run a 12.1-12.2 with that 1/8. It really depends on MPH too.

 

I usually pick up around 20-22 mph from the 1/8 to the 1/4. With that 1/8 mile time, 11.85 sounds about right to me.

 

its to open of a subject to get a real answer. some rides are 1/8 mile dogs and top end kings and some are 1/8 mile champs and topend pigs.

you can run a 7.99 in 1/8 and i can run a 8.5 in 1/8 and i can still walk you on topend. were as the numbers would say yo uwould win and that probably wouldnt be the case.

for example look at a dyno queen supra. dogs in 1/8 and all topend. NA motors love the low end and boosted for instance huge turbos are topend kings.

any figures ppl come up with are rough ideas and cant be taken likely

 

Ok that time must be off I left my slips at work and will get ahold of them tomorrow. I would think I would be around the 14's.

 

I ran an 8.58@89.51 in the 1/8th and the 1/4 ended up being 12.89@115.93. I gained alot of MPH after the 1/8 thanks to giggle gas. I always had strange times and MPH with the 225 shot, mostly because the tires would break loose at 75mph. I sprayed off the line once and spun nearly the entire first 1/8th. I was fishtailing and rolling smoke everywhere. The track officialy were not too happy and had some nasty things to say. LOL

 

I have always found that if you divide your 1/8 mile time by 2/3 (.666) that will get you pretty close to the 1/4 mile time. (You can acheive the same number by multiplying by 1.5).

Going the other direction, multiply your 1/4 mile time by 2/3 to get the approximate 1/8 mile time.

This rule of thumb gets you pretty close, but starts to lose accuracy the faster the vehicle is because of the huge wind drag at 100+ MPH speeds.

The same rule of thumb does not work for the MPH though, so you just have to guess.

 

7.599 is QUICK for the 1/8 mile. I use this chart for conversions:

http://www.eldiabloblanco.com/calculator.htm

According to this, you should run approx. 11.86 in the 1/4 mile. Not bad, what are your mods?