Originally Posted by Chuck33079 ET is driver dependent, but trap speeds are a pretty good measure of power and they aren't subject to manipulation like dynos. so I can put
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09-09-2013, 10:04 AM | #1 (permalink) | |
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or even if i cut my springs..? Or when I have a passenger and a 500lb audio setup? |
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09-09-2013, 10:05 AM | #2 (permalink) |
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Speed, not times. And who in their right mind runs the 1/4 with a passenger?
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09-09-2013, 10:18 AM | #3 (permalink) | |
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09-09-2013, 11:15 AM | #4 (permalink) | |
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traction changes trap speed weight changes trap speed gas quality changes trap speed altitude changes trap speed temperature changes trap speed having to correct the wheel slightly changes trap speed wheel hop changes trap speed having to turn off my damn wipers in a panic cus of wheel hop changes trap speed seeing the guy next to you run <10 and you giving up changes trap speed |
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09-09-2013, 11:41 AM | #5 (permalink) | |
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You are correct, some of the things you mentioned do have an effect on traps to some degree. Traction/wheelhop is really to only one to be concerned with. Gas quality, temp and altitude would effect dyno numbers to the same degree as trap speeds. Your last two are asinine. You're correct in pointing out that trap speed is not an absolute, and it can be affected by outside factors. So can dyno numbers. Dynos can be made to show you pretty much whatever number you want. The only way to get an absolutely correct hp reading would be an engine dyno in a controlled environment. Any other method has drawbacks. Trap speed is very commonly used to calculate HP. The formula for calculating hp from trap speeds is: hp = (mph / 215.39)3.3135 x weight (lbs) This page has a pretty good breakdown of the math involved, if you're curious. Shamelessly stolen from a 300GT/Stealth site. Stealth 316 - Formulas for 1/4 mile ET & mph vs. hp & wgt
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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent Last edited by Chuck33079; 09-09-2013 at 11:45 AM. |
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09-09-2013, 11:57 AM | #6 (permalink) | |
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when its really not. TBH a place like Z1 is a good place to compare power. They dyno so many Z's all the time and its a Dynojet. Theres no configuring etc. Temps and all that matter, but when you host a dyno day and run 40 cars back to back.. its a good comparison. better than 1/4 times where each setup and driver is different. |
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09-09-2013, 12:05 PM | #7 (permalink) | |
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09-09-2013, 12:08 PM | #8 (permalink) | |
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Going from the top time for a stock car in the 1/4 times thread (12.938@108.31) and the curb weight of a base sport (3232lbs), the LRT calculator for getting hp from mph and weight spits out 331 hp. The other two methods are described in the article as being less accurate. That's why I posted the specific formula for the one that was closest- hp = (mph / 215.39)3.3135 x weight (lbs)
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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent Last edited by Chuck33079; 09-09-2013 at 12:14 PM. |
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