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View Poll Results: Which car would win in a drag race?
Car A will win because it has twice as much torque. 216 51.55%
Car B will win because the engine spins faster. 80 19.09%
The cars will tie. 123 29.36%
Voters: 419. You may not vote on this poll

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Old February 13th, 2006, 15:36   #106
jnecr
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I had nothing better to do there for awhile.. it was a Sunday you know.
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Old February 13th, 2006, 15:47   #107
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Quote:
Originally Posted by nicklockard
How about making a 3 dimensional plot of x,y,z: RPM, T, acceleration.

Nick, you don't happen to have dyno sheet with actual data instead of the graph do you? Don't dynos put out a spreadsheet type output as well as a graph? It seems to me that they would have to...
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Old February 13th, 2006, 18:27   #108
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That's what I was hoping to find in the picture server here somewhere...you need the numbers (in reasonably close increments) to build the spreadsheet for graphing. But hey...we're moving to newer, bigger labs and offices this week.... I've got to pack
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Old February 13th, 2006, 18:48   #109
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I looked extensively and found nothing... even used the elusive search feature...
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Old September 15th, 2006, 18:27   #110
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Bump...cuz this thread rocks and its always relevant.
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Old September 15th, 2006, 18:53   #111
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Quote:
Originally Posted by jackbombay
You have 2 identical cars with the exception of the engine and the transmission, the engine and trans of both cars are the same weight though.

Car A has an engine that produces 420 lb/ft of torque at 2500 RPM for an output of 200 WHP and it has a CVT tranny that has no losses and it maintains a constant engine speed of 2500 RPM under all conditions.

Car B has an engine that produces 210 lb/ft of torque at 5000 RPM for an output of 200 WHP and it has a CVT tranny that has no losses and it maintains a constant engine speed of 5000 RPM under all conditions.

Which car would win in a drag race?
I'm gonna think outside the box for a minute...

I say NEITHER car will win since they won't go anywhere because they are producing POUNDS PER FOOT (lb/ft) as stated in the problem, not torque (ft-lbs). Neither of them will get off the line since they aren't producing any torque (ft-lbs).

There's a BIG difference between foot-pounds (ft-lbs), feet per pound (ft/lb), and pounds per foot (lb/ft).

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Old September 16th, 2006, 00:57   #112
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if its makeing the same wheel hp.. then wouldn't the tdi win bcause its hitting that power earlier and with more torque??. it seems to me that if you have the same power its more of a race to that power.. and tdi's have less the half the distance to go
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Old September 16th, 2006, 09:21   #113
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The other car simply revs to its power band before launch.
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Old September 16th, 2006, 12:25   #114
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so doesa the tdi!
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Old September 16th, 2006, 12:29   #115
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Quote:
Originally Posted by bareass
so doesa the tdi!
That's why having the power band at higher revs doesn't matter, or at lower revs either.
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Old September 18th, 2006, 10:50   #116
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Quote:
Originally Posted by n1das
I'm gonna think outside the box for a minute...

I say NEITHER car will win since they won't go anywhere because they are producing POUNDS PER FOOT (lb/ft) as stated in the problem, not torque (ft-lbs). Neither of them will get off the line since they aren't producing any torque (ft-lbs).

There's a BIG difference between foot-pounds (ft-lbs), feet per pound (ft/lb), and pounds per foot (lb/ft).


Literalist!
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