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Haulin_A_Doo
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Haulin_A_Doo Aug 16, 4:22am - #250628 
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Ontario
HORSEPOWER & TORQUE

Horsepower is defined as 33,000 foot pounds of work per minute.

When dealing with automotive engines. You need to measure units of force from rotating objects such as crankshafts. So, you use terms which define a "twisting" force, such as foot pounds of torque. A foot pound of torque is the "twisting" force necessary to support a one pound weight on a weightless horizontal bar, one foot from the fulcrum.

Now you need to visualize that one pound weight, one foot from the fulcrum on its weightless bar. If you rotate that weight for one full revolution against one pound of resistance, you have moved it a total of 6.2832 feet (Pi X a two foot circle). You have also done 6.2832 foot pounds of work.

As stated above, 33,000 foot pounds of work per minute is equivalent to one horsepower. That was definition was formulated by a man by the name of Watt.

If you divide the 6.2832 foot pounds of work you've done per revolution of that weight into 33,000 foot pounds, you come up with one foot pound of torque at 5252 rpm's is equal to 33,000 foot pounds per minute of work. That is the equivalent of one horsepower. If you only move that weight at the rate of 2626 rpm, it's the equivalent of 1/2 horsepower (16,500 foot pounds per minute). SOOOO, the following formula applies for calculating horsepower from a torque measurement:

Horse Power = Torque X RPM / 5252

Torque is the only thing you feel in a car. Horsepower is just sort of a generic comparison. 300 foot pounds of torque will accelerate you just as hard at 2000 rpm as it would if you were making that torque at 4000 rpm in the same gear. If you put it in the formula, the horsepower would be "double" at 4000 rpm; therefore, horsepower isn't particularly meaningful from a driver's perspective. The two numbers only get closer at 5252 rpm, where horsepower and torque always come out the same.
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Shiftyz1x
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Shiftyz1x Aug 16, 4:25am - #250629 

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2003 Toyota Celica GT

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WV, USA
wow never thought of that...makes sense though... thumbsup
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Especial187
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Especial187 Aug 16, 4:47am - #250630 
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2000 Toyota Celica

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O.C. California
Well then what can I do to get more low end tourqe? I have an Injen Intake and it feels like I have no torque till I get up to high third.
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Haulin_A_Doo
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Haulin_A_Doo Aug 16, 4:50am - #250631 
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Boost thumbsup
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ravertony
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ravertony Aug 16, 5:18am - #250632 
2002 Super White Toyota Celica
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2002 Toyota Celica

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a bit confusing but helpful.. wish our cars had better low end
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oas
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oas Aug 16, 5:55am - #250633 
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eek thumbsup
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spaztikid
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spaztikid Aug 16, 6:09am - #250634 
dikitzaps
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yeah no shit
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Haulin_A_Doo
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Haulin_A_Doo Aug 16, 7:02am - #250635 
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Its elementary my dear Watson. laughsilly
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stefanoc
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stefanoc Aug 16, 7:24am - #250636 

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2002 Toyota Celica

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CA
confusing, but meaningful. you cant understand it reading it once i suppose.
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Akita
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Akita Sep 9, 10:57pm - #250637 

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2001 Toyota Celica GT

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Manchester UK
so what does the "Brake" in BHP signify? spineyes
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Haulin_A_Doo
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Haulin_A_Doo Sep 10, 12:45am - #250638 
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I think it a method of measuring it. Braked horsepower? They use a braking device to resist the motor & measure it? I donno ... confused
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