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+--- Thread: 0-60?? 459ft - 60mph (/showthread.php?tid=711)
0-60?? 459ft - 60mph - ginge191 - 02-01-2012
From a set of lights, minor rolling i got from the lights to a the next set of speed limit signs and google maps says that it is 459ft. whats my 0-60 on this??
what math is involved so i would know for future reference as a similar test?
Re: 0-60?? 459ft - 60mph - cully - 02-01-2012
umm did you time it and did you get to 60 without falling off the island?
Re: 0-60?? 459ft - 60mph - ginge191 - 02-01-2012
cully Wrote:umm did you time it and did you get to 60 without falling off the island?
wow cully, i would expect it from the rest of this rabble, but you... not from you. You've dissapointed my expectations. Id seen you posted and thought "ah fantastic a reliable member with an answer.."
but no... :naughty:
Re: 0-60?? 459ft - 60mph - cully - 02-01-2012
to do a 0-60 you need to time yourself from 0-60
the distance is not important
you only need distance and time to work out speed
speed= distance/time
distance= speed x time
Time= distance/speed
Re: 0-60?? 459ft - 60mph - ginge191 - 02-01-2012
there must be a way of working this out, as distance is relative to speed?
i travelled X distance and hit this speed...
hmmm google is my best bet for math equations im thinking?
Re: 0-60?? 459ft - 60mph - cully - 02-01-2012
so ok
1ft=0.0001893939 miles
so
0.0001893939 x 459
=0.0869318001
so
0.0869318001 x 60
=5.2159 seconds
Re: 0-60?? 459ft - 60mph - Rippthrough - 02-01-2012
Not really, acceleration isn't linear, so your average speed could be pretty varied...you're roughly looking at somewhere between 8 and 9 seconds but tbh it could be outside those.
Re: 0-60?? 459ft - 60mph - Connor - 02-01-2012
There's no way to calculate it, as you can't calculate your acceleration (well you can, but its beyond any of us)
Oh and what Phil said...
Re: 0-60?? 459ft - 60mph - Rippthrough - 02-01-2012
Going on a best guess from dturbo ratios, bit of gearchange time, etc, some quick calcs put a 'best guess' effort at about 8.7s.
But I'm not saying that's remotely accurate!
Re: 0-60?? 459ft - 60mph - Matty - 02-01-2012
How did you get to 8.7s
Re: 0-60?? 459ft - 60mph - Rippthrough - 02-01-2012
Vehicle acceleration is much faster at lower speeds, probably double at the start of the run compared to the end - so you could approximate the car being over 40mph for half the distance, split it into a couple of sections as a best guess effort given the dturbo gear ratios for acceleration bands, average speed of those combined gives you a rough average speed over the distance, add in a little time per gearchange - 300/400ms is about average for most people pressing on - and that gives you a little more accurate average speed of around 35-36mph over the distance
Convert the 459ft into miles, divide by the average speed, multiple by 360 to get it in seconds.
But it's still mainly guesswork.
Re: 0-60?? 459ft - 60mph - ginge191 - 02-01-2012
oh, take into considertaion my flappy padel's - thats a gear change of 100ms
i joke, i appreciate the effort guys...
Re: 0-60?? 459ft - 60mph - Rippthrough - 02-01-2012
The problem is, the faster the car is, the slower it can theoretically do the time, because it's got so much more acceleration available to hit 60 toward the end.
Re: 0-60?? 459ft - 60mph - ginge191 - 02-01-2012
i can understand where people are coming from, saying its nearly impossible, but if distance was travelled with an optimum speed reached, this wouldn't be the same for every car...
The time would differ purely because a distance would chage
SO if i hit 60mph in 400ft, my 0-60 inevitably would differ.
this is the rule thats spinning my head...
Re: 0-60?? 459ft - 60mph - Rippthrough - 02-01-2012
A car with a shorter first gear and longer second gear would be faster over the same distance even if took longer to reach 60mph...
You can make an approximation by guessing at the acceleration rates but that's about all.
Re: 0-60?? 459ft - 60mph - Dum-Dum - 02-01-2012
No way of working it out from those 2 facts of 459ft and 60mph terminal. If we had a distance to 20mph and a distance to 40mph then maybe we could do better. Oh and i has a pic to find for you
Re: 0-60?? 459ft - 60mph - ginge191 - 02-01-2012
Rippthrough Wrote:A car with a shorter first gear and longer second gear would be faster over the same distance even if took longer to reach 60mph...
You can make an approximation by guessing at the acceleration rates but that's about all.
but what difference would it make, i got to that distance by 60mph,
to play devils'advocate - what if my 1st gear took 3seconds to reach optimum, then 2nd shot me the rest of the way to 60 through an amazing boost, and a strong gust of wind...
what im saying is, despite gear ratio and gear eccelreation, i still get to 60 in that distance? i dont need to know my optimum speed and torque amounts?
Re: 0-60?? 459ft - 60mph - Rippthrough - 02-01-2012
Yes, but you can cover that distance in quite a variable amount of time and still hit 60mph depending on how the car accelerates...
Re: 0-60?? 459ft - 60mph - ginge191 - 02-01-2012
Rippthrough Wrote:Yes, but you can cover that distance in quite a variable amount of time and still hit 60mph depending on how the car accelerates...
hm i think i see what you mean now... time can differ over distance, the first 200ft i could crawl and then hit 60mph, for the last 250...
i think i understand this now..
Re: 0-60?? 459ft - 60mph - Dum-Dum - 02-01-2012
Because to work out speed distance or time we use the below sums below
speed= distance/time
distance= speed x time
Time= distance/speed
But acceleration is different. If you think of speed being measured in meters per second (m/s) then acceleration is measured in meters per second per second or m/s/s
Or for a bit easier to understand think mph for speed and mphph for acceleration
I would explain this better but Poodle has all my engineering textbooks so I cant look it up.
Re: 0-60?? 459ft - 60mph - Dum-Dum - 02-01-2012
Oh and if it helps pics of my scanguage, the first is stage 1, the second is stage 2.
BIM that the HDi has different power curves and gear ratios among other things
![[Image: ScanguageIIfirstproper0-60-1.jpg]](http://i245.photobucket.com/albums/gg47/Dum-Dum1986/306%20HDi%20Estate/ScanguageIIfirstproper0-60-1.jpg)
![[Image: ScanguageIIStage20-60.jpg]](http://i245.photobucket.com/albums/gg47/Dum-Dum1986/306%20HDi%20Estate/ScanguageIIStage20-60.jpg)
Re: 0-60?? 459ft - 60mph - ginge191 - 02-01-2012
ah ok, i see where your coming from now - cheers for the help