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well MarC, this is not my calculation-just a link. just out of curiousity-how "off" is the HP one? can u shed some light on it? and also - is the 1/4 mile one off? thanks for looking anyway MarC.. :)
 

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A quarter-mile calculator should really calculate trap speed, not ET (trap speeds are far more consistent).

The following formula is used for many such calculators:


HP = Weight (lbs) x (Trap Speed (mph) / 234) ^ 3
 

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<font face="Verdana, Arial" size="2">1hp = 550lb 1ft 1second...
i guess thats assuming 1:1 gear ratio and 15% driveline loss...</font>
Actually, horsepower is derived directly from torque. That's why on a dyno chart the HP and Torque curves cross at the exact same point every time. I can dig up a HP vs Torque article if you want, it's sort of a tricky subject and even though I've read a lot about it I don't feel like I know enough to explain it.



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Paul
'92 NX2000 w/ mods
 

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<font face="Verdana, Arial" size="2">Originally posted by Scarpa:
Actually, horsepower is derived directly from torque. That's why on a dyno chart the HP and Torque curves cross at the exact same point every time. I can dig up a HP vs Torque article if you want, it's sort of a tricky subject and even though I've read a lot about it I don't feel like I know enough to explain it.

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you got me all wrong, i just gave out the definition for the unit horsepower. i mentioned that those trap-speed calculators probably assumes that there is a 15% parasitic loss (through drivetrain) and that all the crank is hooked up to wheels at axles at 1:1 ratio.

hp is a calculated number from torque and engine speed. hp = torque*rpm/5252
 
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