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oldcorollas
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
 
Re: TORQUE Tue, 24 June 2003 11:12 Go to previous messageGo to previous message
rusty wrote on Tue, 24 June 2003 20:29


"identical power" ...
"accelerate at the same rate".



that;s the whole frickin point dude, wake up!!!
do some equations and get back to me Wink


"F1 has 3 times power because of higher rpm."
"F1 car acclerates 3 times faster."

again, that's the whole point, if you gear a car to take advatage of the rpm at which it makes peak torque, you get gearing advantages.

rusty wrote on Tue, 24 June 2003 20:29


now allow me to pose an alternative question. one engine with 500lb/ft of torque and only 100hp, another engine with 500hp but only 100lb/ft of torque. both engines in two completely identical cars, with the only exception being gearing, any gearing being allowed. you tell me which car will be quicker. if you still think its car a, im afraid there is no hope for you.



LOL ROTFL Very Happy Very Happy
so you want me to take a car with 9.5hp (500lb/ft@100rpm)
and race you with a car with 500hp (100lb/ft@26260rpm

dude lay off the drugs, who the heck do you think would win???

i'm saying that if you had that 500hp 26260rpm monster of a motor (which by the way, would be a 740cc under 100% efficiency)
and raced me with a 100rpm motor with 26260lb/ft (which would be an ideal 196L motor), then we would have an even race....

this is because when all is said and done and you gear the motors down, they have the same torque at the rear axle and the same force at the tyres.
please get this idea. it hurts that you can't grasp it Wink



rusty wrote on Tue, 24 June 2003 20:29


this is good. however the first part (and i quote again; "the TORQUE an engine makes and the ENGINE SPEED (rpm) that it makes it at") equals power. funny that.



well duh, that's what i've been saying all along.

how do you calculate the acceleration of anything? F=MA
how do you work out what the force at a tyre contact patch is? F=TQ/wheel radius

how do you work out axle torque?
engine torque x gearing.

but how do you work out power?
hp = ((lb/ft)xrpm/5252
or (lb/ft) = (hpx5252)/rpm

how do you work out power at rear axle
hp/gearing

tyre contact force,
F = (engine torque) x gearing/wheel radius

how do you work out power at rear axle
hp/gearing

lets take two motors with same power, one at 5000rpm, one at 10000rpm, the 10000rpm motor is geared at 2:1 compared to 5000rpm one

for 10000rpm
axle hp = hp/2

for 5000rpm
axle hp = hp

since (lb/ft) = (hpx5252)/rpm

for 10000rpm
lb/ft = (hpx2626)/rpm

for 5000rpm
lb/ft = (hpx5252)/rpm

now since
F = (engine torque) x gearing/wheel radius

for 10000rpm
F= (((hpx2626)/rpm) x 2)/wheel radius
F=((hpx5252)/rpm)/wheel radius

for 5000rpm
F= (((hpx5252)/rpm) x 1)/wheel radius
F=((hpx5252)/rpm)/wheel radius

and whoop de doo, they are the same. same force at tyre for same POWER, even tho the 10000rpm engne has half the torque as the 5000rpm one.... they still accelerate at the same rate

now please show me your calculations to disprove that two cars with identical POWER, but different TORQUE, when gearing is made to equal the top speed of both motors, will not have the same acceleration..

i dare you.. no i double dare you to brign those calculations to the forum, or even dyno day (if you will show up)

you can't accept that a motor with twice the torque but half the revs and half the gearing accelerates at the same speed as one with half the torque, double the revs and double the gearing...

fcs, i agree with you that more power = faster acceleration, but this does not happen unless you change gearing. and in the real world there are only a certain number of ratios you can choose. do you change you diff everytime you increase the rpm range of your motor? (i actually did when i cammed my 4K, i put a 4.33 instead of a 4.11, TO TAKE ADVANTAGE OF GEARING!!!)

please check the clacs above and show me how what i have said is incorrect from a mathematical standpoint.
Cya at the dyno day (i assume you are coming?)
Stewart
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Read Message   TORQUE BAD22Sat, 21 June 2003 04:43
Read Message   Re: TORQUE oldcorollasSat, 21 June 2003 07:20
Read Message   Re: TORQUE trent_kershawSat, 21 June 2003 09:52
Read Message   Re: TORQUE wilbo666Sat, 21 June 2003 12:29
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Read Message   Re: TORQUE gianttomatoSun, 22 June 2003 02:18
Read Message   Re: TORQUE rustyMon, 23 June 2003 19:37
Read Message   Re: TORQUE BAD22Tue, 24 June 2003 01:57
Read Message   Re: TORQUE oldcorollasTue, 24 June 2003 07:17
Read Message   Re: TORQUE rustyTue, 24 June 2003 08:33
Read Message   Re: TORQUE oldcorollasTue, 24 June 2003 09:32
Read Message   Re: TORQUE gianttomatoTue, 24 June 2003 09:42
Read Message   Re: TORQUE GremlinThu, 26 June 2003 02:16
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Read Message   Re: TORQUE  oldcorollasTue, 24 June 2003 11:12
Read Message   Re: TORQUE gianttomatoTue, 24 June 2003 11:46
Read Message   Re: TORQUE oldcorollasTue, 24 June 2003 12:01
Read Message   Re: TORQUE trent_kershawTue, 24 June 2003 14:03
Read Message   Re: TORQUE NO-18rSat, 21 June 2003 08:48
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Read Message   Re: TORQUE manipulateSun, 22 June 2003 01:55
Read Message   Re: TORQUE charliechalkSun, 22 June 2003 11:26
Read Message   Re: TORQUE BAD22Sun, 22 June 2003 15:58
Read Message   Re: TORQUE gianttomatoMon, 23 June 2003 01:05
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Read Message   Re: TORQUE THE WITZLTue, 24 June 2003 12:27
Read Message   Re: TORQUE trent_kershawTue, 24 June 2003 12:44
Read Message   Re: TORQUE THE WITZLTue, 24 June 2003 13:06
Read Message   Re: TORQUE rustyTue, 24 June 2003 16:35
Read Message   Re: TORQUE juzzo84Tue, 24 June 2003 21:08
Read Message   Re: TORQUE boudanTue, 24 June 2003 22:49
Read Message   Re: TORQUE Super JamieWed, 25 June 2003 07:26
Read Message   Re: TORQUE and shite stirring oldcorollasWed, 25 June 2003 12:27
Read Message   Re: TORQUE and shite stirring oldcorollasWed, 25 June 2003 12:36
Read Message   Re: TORQUE boudanThu, 26 June 2003 00:37
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Read Message   Re: TORQUE dar_sbbThu, 26 June 2003 01:58
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Read Message   Re: flat TORQUE curves oldcorollasThu, 26 June 2003 06:23
Read Message   Re: flat TORQUE curves NarkThu, 26 June 2003 06:45
Read Message   Re: flat TORQUE curves oldcorollasThu, 26 June 2003 07:03
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