Question on Torque>><<<????????????
Thread Starter
Burning Brakes
Joined: Jul 2006
Posts: 818
Likes: 0
From: Salinas Cali
Question on Torque>><<<????????????
Hey guys still learning and I have a kinda dumb question. I keep reading about the C6 and it reads 400 HP with 400 pound feet of torque but I see posts of 394 RWHP, 376 TQ after dyno from their C6 after mods.
I'm a little confused doesnt it suppose to be higher at RWHP.
What do you guys consider power from the car? BAsed on the HP or the RWHP or TQ!?
Please explain? Thanks Guys
I'm a little confused doesnt it suppose to be higher at RWHP.
What do you guys consider power from the car? BAsed on the HP or the RWHP or TQ!?
Please explain? Thanks Guys
Team Owner
Joined: Aug 2003
Posts: 38,314
Likes: 35
Hey guys still learning and I have a kinda dumb question. I keep reading about the C6 and it reads 400 HP with 400 pound feet of torque but I see posts of 394 RWHP, 376 TQ after dyno from their C6 after mods.
I'm a little confused doesnt it suppose to be higher at RWHP.
What do you guys consider power from the car? BAsed on the HP or the RWHP or TQ!?
Please explain? Thanks Guys
I'm a little confused doesnt it suppose to be higher at RWHP.
What do you guys consider power from the car? BAsed on the HP or the RWHP or TQ!?
Please explain? Thanks Guys
I hate this "rule" but it is said that driveline losses for manuals amount to 15% and for automatics 20%. Thus a bone stock manual C6 should dyno with 340 RWHP or thereabouts.
Last edited by '06 Quicksilver Z06; Jan 27, 2007 at 09:26 PM.
Melting Slicks
Joined: Oct 2005
Posts: 3,053
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From: NorCal
And the different numbers are arrived at by factory figures being taken at the flywheel. Then the cars are put on a dyno after the mods and you get dyno numbers from the rear wheels i.e. rwhp as compared to flywheel hp.I hope thats clearer.
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Pro
Joined: Aug 2006
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From: Dayton Ohio
Here's the key: power is simply torque times engine speed (you can't just multiply HP x rpm because the units don't work out right; there's a units correction factor in there. Google HP and torque definitions and you'll get the correct equation if you're that interested).
In other words, torque is what pushes you back in the seat; the faster your engine is spinning while it's making good torque means you can hold a gear longer (and shazam, you're making more power). Hope that's not too much more info than you wanted
Team Owner
Joined: Sep 2003
Posts: 43,084
Likes: 33
From: Raleigh / Rolesville NC
HP = ((Torque * RPM) / 5252)
"It is better to make torque at high rpm than at low rpm, because you can take advantage of *gearing*."
http://vettenet.org/torquehp.html
"It is better to make torque at high rpm than at low rpm, because you can take advantage of *gearing*."
http://vettenet.org/torquehp.html
Le Mans Master
Joined: Dec 2004
Posts: 5,759
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From: AZ
St. Jude Donor '06-'08-'10-'11-'12-'13 '14-'15-'16-'17-'18-'19
I have always stuck with the idea that HP determines your top speed and torque determines how fast you will get to that top speed. Somewhat simplified but it works. Hope that helps.
Thread Starter
Burning Brakes
Joined: Jul 2006
Posts: 818
Likes: 0
From: Salinas Cali
HP = ((Torque * RPM) / 5252)
"It is better to make torque at high rpm than at low rpm, because you can take advantage of *gearing*."
http://vettenet.org/torquehp.html
"It is better to make torque at high rpm than at low rpm, because you can take advantage of *gearing*."
http://vettenet.org/torquehp.html
Le Mans Master
Joined: Sep 2004
Posts: 5,707
Likes: 4
From: Los Angeles
Here we go again. 
You will get as many definitions of torque and hp as there are members on this forum.
Au_n_egl has it correct. The hp at any given rpm is calculated from the torque at that rpm.
A good layman's definition of hp is in the example of applying 100lbs of torque on a lugnut with a long wrench. That can be done with relative ease if the wrench is long enough. The hp comes in when you try to apply that torque while the wheel is unsecured. In other words, it takes hp to apply 100 lbs of torque on a wheel that's spinninng. As you can imagine, you would run out of hp very fast.
You will get as many definitions of torque and hp as there are members on this forum.
Au_n_egl has it correct. The hp at any given rpm is calculated from the torque at that rpm.
A good layman's definition of hp is in the example of applying 100lbs of torque on a lugnut with a long wrench. That can be done with relative ease if the wrench is long enough. The hp comes in when you try to apply that torque while the wheel is unsecured. In other words, it takes hp to apply 100 lbs of torque on a wheel that's spinninng. As you can imagine, you would run out of hp very fast.
Le Mans Master
Joined: Sep 2004
Posts: 5,707
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From: Los Angeles
Le Mans Master
Joined: Jul 2005
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http://www.race-cars.net/calculators/et_calculator.html
It uses the weight and HP of the car only. The first law of Thermodynamics states energy/power can neither be destroyed or created, you can only change it's shape or form. A gallon of gas has a certain amount of energy. When introduced into an engine, that energy is changed to heat going to the coolant, heat going out the exhaust, noise (yes, noise has energy as well as light), heat to friction, and turning the wheels to propel the car. However, the sum of all the different flow paths must add up to the energy in the gallon of gas we started with. Torque is a force that can be multiplied/divided, which is exactly what the transmission/differential does. In short, you can make whatever amount of torque you want with gears, but if you have 505 HP, you'll always have 505 HP...no more and no less (excludes mods...just had to add that disclaimer
). AU N EGL gave the best link to understand the difference between torque and HP, understand that link and the rest is a piece of cake.