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Old 05-18-2001, 03:19 PM   #1
Jessie James
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Question What does more torque do?

Okay, let's say you could double your torque on a RS. (So around 300-ft/lbs of torque, or whatever.) What performance gains would be recognized?

Better 0-60? Quarter Miles? How much better, theoretically?

[Edit - re-phrased my question.]

[This message has been edited by RS25.com (edited May 18, 2001).]
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Old 05-18-2001, 03:29 PM   #2
Thor's Hammer
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First of all, torque is a measure of rotational force, measured in units of force*length. For instance, with a longer wrench, length goes up, force stays the same, and torque goes up.

Double your torque? It would have a huge effect on every aspect of operating your vehicle.

-Probable transmission, clutch, and differential damage.
-Probable change in gas mileage, depending on how you did it.
-Probable damage to the engine's lower end (crank, rod, and rod bearings).

You can't just double torque without major modifications.

Torque is most evident when taking off. The more rotational force you can exert on your tires, the faster you accelerate.

-Bryan
BSME '95, MSIE '02

[This message has been edited by Thor's Hammer (edited May 18, 2001).]

[This message has been edited by Thor's Hammer (edited May 18, 2001).]
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Old 05-18-2001, 03:33 PM   #3
HomerJay
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You'll have more get up and go from a stand still. I'm sure someone with a engineering or physics background can explain it better. But it basically how power is translated into the tires at lower rpm's. Please feel free to correct me.
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Old 05-18-2001, 03:45 PM   #4
munkis
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Axles would probably snap and fly out the side of the car ahah.

Or your head would go through the headrest on the seat, on a hard launch.

ahahaha

Jay McDade
Auto Tech--Lincoln/Mercury/Jaguar
www.hometown.aol.com/impreza25rs2000
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Old 05-18-2001, 04:08 PM   #5
stimpy
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horsepower = (Torque x RPM)/5252

Therefore, by simply increasing the torque by two-fold, you have just doubled your horsepower at that RPM.

IE: the Impreza has 166 lb-ft @ 4000 rpm, therefore it has 126hp @ 4000rpm via the equation given.

If you now have 322 lb-ft @ 4000 rpm, you now have 245 hp @ 4000rpm.

Does that help?

More or less, torque gets you off the line and horsepower keeps you going...

-Jon
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Old 05-18-2001, 08:15 PM   #6
NebScoob
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It's a theoretical question guys...
http://www.datsuns.com/torquehp.htm

The Above is a pretty good artical about the relationship between HP, torque and acceleration. A quote from there...

"Any given car, in any given gear, will accelerate at a rate that *exactly* matches its torque curve"

Meaning...when you double the torque you are going to accelerate in any given gear a whole lot faster. What I'm not sure of is if it is double or not. When I do the math in my head it says yes...

F=MA so A=F/M

Lets say mass is 500, torque is 150 gives .3 g of acceleration. Torque is 300, mass same at 500 =.6g acceleration. (I didn't quite pull these numbers out of nowhere, they are rounded examples close to observed numbers, in case you were wondering.)

If you can go from 40 to 50 in four seconds before, will you be able to do it in 2 after doubling the torque? Maybee, but there a lot of hidden variables in there and I don't even like doing acceleration math problems, they make me dizzy. Maybee someone else could help out here.

As for 0-60, quarter mile...There will be improvements in some areas, but you still have to launch, bang gears, ect...which all take time. Doubling the torque will not make you go from 8 sec 0-60 to 4 sec... but 6 should be do-able.
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Old 05-18-2001, 08:19 PM   #7
tom@kartboy
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this

<IMG SRC="http://albums.photopoint.com/j/View?u=1471652&a=12968346&p=48718564" border=0>
tom@kartboy.com
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Old 05-18-2001, 08:24 PM   #8
NebScoob
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"I see!" said the blind man to his deaf dog.
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Old 05-18-2001, 08:36 PM   #9
Jessie James
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I'm not worried about that puny little 5-speed tranny... I have an automatic.

So, basically, more torque sounds like it is the **** for someone who is not concerned about top speed (I'm not.)

Okay, off to do my research. Thanks for all the info guys!
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Old 05-19-2001, 10:17 AM   #10
Fido
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Ya, more torque equals broken tranny...But oh well Ya only live once!
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Old 05-19-2001, 11:10 AM   #11
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