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Old 01-31-2007, 04:31 AM   #1 (permalink)
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Default Horsepower Design Equations and Formulas Calculator

Hello guys, want to share this with you & have your ideas as well.

Horsepower Design Equation Formula Calculator - Engine Horsepower Trap Speed Method

<<quote>>

Solving for engine horsepower using the trap speed method.

HP = weight x (velocity / 234) cubed

This method uses the speed or velocity at the end of a quarter mile
run. It is used to give an estimate of vehicle (car, truck, motorcycle)
engine horsepower. Weight should include the mass of the vehicle,
driver and passenger.

<<unquote>>

I can tell you exactly the units for each item (wt.,velocity, etc.)
but you can use the calculator from the site & you can directly
input your data with their corresponding units to choose from.
I also don't know where they got the constant "234" and its unit
also.

There are other HP calculators also using the elapse time in a quarter
milw run. You can go to this link:

Horsepower Design Equations Formulas Calculator - Engine Horsepower ET Method

What do you think guys?
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Old 02-07-2007, 09:25 PM   #2 (permalink)
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Guess everbody here knows there Specs very well.
Actually, if you have your specs w/ all the info (HP,Torque,Wt.)
you don't need these grumpy formulas anymore.

Anyone???
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Old 02-08-2007, 06:13 AM   #3 (permalink)
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That formula has been used for years. Its pretty accurate actually. 1/4 mile speed is a good hp indicator. 1/4 time is not.
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Old 04-12-2007, 01:16 AM   #4 (permalink)
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I have read from one site that the 550cc Carry is 45hp and 50hp for the 660cc. It was not indicated whether the figures were brakeHP or EffectiveHP.
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Old 04-15-2007, 11:38 PM   #5 (permalink)
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Quote:
Originally Posted by XL7Limited
That formula has been used for years. Its pretty accurate actually. 1/4 mile speed is a good hp indicator. 1/4 time is not.
One question: Do we have to really "floor" the gas to get a more
accurate hp ?

If we have a 5-speed MT, do we have to reach until the 5th gear just
in time to reach a quarter mile? for better result???
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Old 04-15-2007, 11:41 PM   #6 (permalink)
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Quote:
Originally Posted by lance_pad
I have read from one site that the 550cc Carry is 45hp and 50hp for the 660cc. It was not indicated whether the figures were brakeHP or EffectiveHP.
You're right Lancepad, I also read that from other site, saying our 660cc
is 52hp. But we don't know for sure ???
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Old 04-16-2007, 03:34 PM   #7 (permalink)
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you should not be in 5th by the quarter mile on a stock car..


Quote:
Originally Posted by BRUCE LI
One question: Do we have to really "floor" the gas to get a more
accurate hp ?

If we have a 5-speed MT, do we have to reach until the 5th gear just
in time to reach a quarter mile? for better result???
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Old 04-17-2007, 01:56 AM   #8 (permalink)
 
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so how do we do it exactly in the quarter mile in order to get the right HP for the van?
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Old 04-20-2007, 12:09 AM   #9 (permalink)
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Quote:
Originally Posted by XL7Limited
you should not be in 5th by the quarter mile on a stock car..
Thanks for the info, I figured out that our vehicles will run faster if we
prolong (to a certain RPM) our gear shifting to build enough power or
momentum to reach top speed, compared to just "hurrying up" to reach
the 5th gear.

I think this is why I run slower compared to other drivers because I dont
stay longer than 5sec. in one gear (1st, 2nd, 3rd), tsk, tsk, tsk. . .
Also, I won't allow my RPM to reach 3000 before shifting to the next
gear (1, 2 & 3). In the 4th & 5th however, I can stay longer (sec.) &
even reach a higher RPM.

Am I doing the right thing here?

.
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Old 04-22-2007, 08:33 PM   #10 (permalink)
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Bruce, I have read an article stating that for the best fuel economy, upshifts should be between 2000-2500 rpm. Sad to say, our Zuks don't have stock tachometers.

I believe you have a tach installed. Can you walk me through the installation? This would be the next project for my ride. Pls advise on the details of the materials you used. Thanks.
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