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Joined: Jul 2004
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Haulin_A_Doo
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Haulin_A_Doo
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Posts: 2,016
Ontario
Aug 15, 9:22pm - #250628 
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.

Joined: Jun 2004
Posts: 380
Shiftyz1x
Member
Shiftyz1x

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2003 Toyota Celica GT

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Posts: 380
WV, USA
Aug 15, 9:25pm - #250629 
wow never thought of that...makes sense though... thumbsup

Joined: Aug 2004
Posts: 46
Especial187
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Especial187
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2000 Toyota Celica

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Posts: 46
O.C. California
Aug 15, 9:47pm - #250630 
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
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Posts: 2,016
Ontario
Aug 15, 9:50pm - #250631 
Boost thumbsup

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ravertony
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ravertony
2002 Super White Toyota Celica
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2002 Toyota Celica

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MADERA, CA
Aug 15, 10:18pm - #250632 
a bit confusing but helpful.. wish our cars had better low end

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oas
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oas
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Aug 15, 10:55pm - #250633 
eek thumbsup

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spaztikid
dikitzaps
spaztikid
dikitzaps
1974 Toyota Celica

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LA
Aug 15, 11:09pm - #250634 
yeah no shit

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Haulin_A_Doo
Specialist
Haulin_A_Doo
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Posts: 2,016
Ontario
Aug 16, 12:02am - #250635 
Its elementary my dear Watson. laughsilly

Joined: Oct 2003
Posts: 1,864
stefanoc
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stefanoc

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2002 Toyota Celica

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Posts: 1,864
CA
Aug 16, 12:24am - #250636 
confusing, but meaningful. you cant understand it reading it once i suppose.

Joined: Sep 2004
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Akita
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Akita

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2001 Toyota Celica GT

Joined: Sep 2004
Posts: 353
Manchester UK
Sep 9, 3:57pm - #250637 
so what does the "Brake" in BHP signify? spineyes

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Haulin_A_Doo
Specialist
Haulin_A_Doo
Specialist

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Posts: 2,016
Ontario
Sep 9, 5:45pm - #250638 
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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