1/4 mile ET/HP calc
#655974
03/30/10 03:19 PM
03/30/10 03:19 PM
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0x01b8
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I'm the guy that wrote the 'RPM/Speed Visual calc' that's linked up in the Tech Archive section. I just finished working on a new calculator and thought you might get some use out of it - 1/4 Mile ET, HP, and MPH Visual Calculatorthanks for reading -john
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Re: 1/4 mile ET/HP calc
[Re: RapidRobert]
#655977
03/30/10 03:40 PM
03/30/10 03:40 PM
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Joined: Jun 2003
Posts: 9,225
Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
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Posts: 9,225
Charleston
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its nice but i dont agree with it. for example, i dont think it takes 640 rwhp at 3650 lbs to run a slow 10.43 maybe i'm using it wrong 
Gen 3 power 6.22@110, 9.85@135
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Re: 1/4 mile ET/HP calc
[Re: sixpackgut]
#655978
03/30/10 08:11 PM
03/30/10 08:11 PM
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Joined: Feb 2005
Posts: 4,313
Prospect, PA
BSB67
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master
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Quote:
its nice but i dont agree with it.
for example, i dont think it takes 640 rwhp at 3650 lbs to run a slow 10.43
maybe i'm using it wrong
 I like the old "Drag Strip Dyno" by Mopar or the Moroso Power Speed calculator. I mostly use the Moroso calculator any more as that is what most everyone else uses, and that makes it apples to apples when comparing numbers between cars. The Drag Strip Dyno has really good info in the text for understanding, but it seems to generate power numbers that are a little higher.
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Re: 1/4 mile ET/HP calc
[Re: sixpackgut]
#655979
03/30/10 09:31 PM
03/30/10 09:31 PM
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Joined: Jul 2007
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Quote:
its nice but i dont agree with it.
for example, i dont think it takes 640 rwhp at 3650 lbs to run a slow 10.43
maybe i'm using it wrong
The formula I'm using is the same one that's all over the net in other calcs which is the Patrick Hale formula. If you punch in that hp/weight into the calc in the mopart's tech archive you'll get almost the same et. So I don't know what to say about it.
Are you saying the 10.43 was slow or the mph that my program was showing was slower than you expected, or both? The whole deal is kinda ballpark but I'd like it to be as accurate as I can make it.
thanks for the comments 
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Re: 1/4 mile ET/HP calc
[Re: 0x01b8]
#655984
03/31/10 04:58 PM
03/31/10 04:58 PM
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LOWELL IN
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i just tried it on 2 cars that i know the weight and hp numbers from the dyno.if you adjust the hp scale so the hp numbers from the dyno match the hp numbers at the fywheel it is pretty dead on with the actual et/mph for the 2 cars
WAXER
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Re: 1/4 mile ET/HP calc
[Re: QWK_ENUF]
#655985
03/31/10 05:46 PM
03/31/10 05:46 PM
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0x01b8
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Quote:
i just tried it on 2 cars that i know the weight and hp numbers from the dyno.if you adjust the hp scale so the hp numbers from the dyno match the hp numbers at the fywheel it is pretty dead on with the actual et/mph for the 2 cars
Hey - can you tell me the hp/et/mph for your two cars? That would really help me get this thing dialed in. thanks.
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Re: 1/4 mile ET/HP calc
[Re: 0x01b8]
#655986
03/31/10 06:35 PM
03/31/10 06:35 PM
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this is as close as i recall
one dyno has been called happy and the other conservative
car 1
3500 lbs
10.0's @ 134
788 hp
car 2
3000 lbs
10.30 @ 134
620 hp
car 3
2990 lbs
10.96 @ 118
560 hp
WAXER
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