can just imagine....at the pub..
120 hp... yeah mate...@ da wools....
13 secs mate... yeah...@sea level...
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| drag racing minis at altitude https://www.ausmini.com/forums/viewtopic.php?f=2&t=6953 |
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| Author: | minicranks [ Fri May 06, 2005 9:14 pm ] |
| Post subject: | drag racing minis at altitude |
I know i asked this on MM's site but it hought i would ask here as there is a greater number of brains here all on at the same time. have a simple question if you drag race a mini at 5800ft above sea level and so the standing 1/4 in 15.2secs is there a calculation that you can use to get a time at sea level or would it be guess work? |
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| Author: | JC [ Fri May 06, 2005 10:26 pm ] |
| Post subject: | |
Yes |
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| Author: | fuzzy-hair-man [ Sat May 07, 2005 8:24 am ] |
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I'm guessing you would have to figure out how much more airflow it will have at sea level and then adjust the horsepower / times in relation to that but this would I imagine be only a guess and would not be real accurate. So if it draws 2% more air at sea level(being denser) then you might be able to say that the horsepower could increase by 2% and therefore factor it into the 1/4 mile time. Vizard's yellow book has a formula and tables for working out horsepower based off 1/4 mile times and the top speed over the 1/4 mile but your speedo has to be dead accurate otherwise it throws the results out. Maybe this formula in reverse would help you. |
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| Author: | danidad [ Sat May 07, 2005 1:46 pm ] |
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just wondering about where these figures came from...??? asking a south african might be a good idea and A they had minis(not that this is a mini specific question) and B they haver a big altitude range.. nothing like hands, and lungs on experience |
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| Author: | minicranks [ Mon May 09, 2005 3:40 pm ] |
| Post subject: | |
its the south african we are talking about. i have got the calculations form the NHDRA web site as a couple of there strips are at the same altitiude. It equates to .9 of a second but also take into fact that there is less air resistance at higher altitude (like a rugby ball being kicked in joburg will fly further than one at the coast) so its a little out as the cars that they race are as aerodynamic as a tear drop really, unlike the brick we drag race. so .7 was an even number we came up with so a 15.2sec 1/4 mile ina 1460mini will be equvilent to a 14.5 at sea level which in any book is very quick. |
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| Author: | cush [ Mon May 09, 2005 4:12 pm ] |
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can just imagine....at the pub.. 120 hp... yeah mate...@ da wools.... 13 secs mate... yeah...@sea level...
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| Author: | minicranks [ Tue May 10, 2005 6:30 am ] |
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need to be a decent sized car park to proove it. dont laugh its not impossible at all, has been done a few times and i suppose it cn be done again. just need a track closer to home to try it on. |
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