GT_Fanatic
(Banned)
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Turbos have a unique ability to spin to outrageously high rpms and turn out very high peak boost figures (25psi+). A turbo charger is capable of producing more peak power than a supercharger, therefore higher torque bands.
turbos and superchargers are fun but they dont give the car anymore torque it just increases the horse power. Just remember theres no replacement for displacement. torque is what gives the car its pushing/pulling power,horse power determines how fast you get ther.
Every time you accelerate hard, what your are actually feeling is HP, it's always HP, and it always HP. Torque by itself is useless. Torque is simply one of the two ingredients to making HP.
Totally wrong. You can't make more HP unless you increase the torque or raise the RPM limiter. People need to stop separating HP and torque as if they are two different forces that act independently of each other. They are not. Every time you accelerate hard, what your are actually feeling is HP, it's always HP, and it always HP. Torque by itself is useless. Torque is simply one of the two ingredients to making HP.
Displacement, is the measure of the volume of air/fuel an engine can hold when the piston is all the way down to the bottom. It's not the size of the engine. So in essence turbos and superchargers do the same thing as increasing displacement would do, but they do it by cramming more air in the space available.
There is no HP without torque, 1 HP is defined as moving 33,000 ft/lb of torque in one minute. How did we get this? Work is defined as force times distance. Therefore lifting a 1 lb weight 1 foot gives us 1 ft/lb of torque. A man named Watt once examined that a horse could life a 550 pound weight 1 foot in 1 second. So one HP is 550 ft/lb of torque per second, or 33,000 ft/lb of torque. HP is actually found by a formula, coming from torque. When you put a car onto a DYNO all the DYNO measures is torque output, then calculates the HP using this formula:
Torqe x RPM
HP = -----------
5250
Where do we get that from? One foot lb of rotational torque at 5250 RPM is 33,000 ft/lb of torque.
So really when you drive what you are feeling is Torque, not HP. 👍
Luke
There is no HP without torque, 1 HP is defined as moving 33,000 ft/lb of torque in one minute. How did we get this? Work is defined as force times distance. Therefore lifting a 1 lb weight 1 foot gives us 1 ft/lb of torque. A man named Watt once examined that a horse could life a 550 pound weight 1 foot in 1 second. So one HP is 550 ft/lb of torque per second, or 33,000 ft/lb of torque. HP is actually found by a formula, coming from torque. When you put a car onto a DYNO all the DYNO measures is torque output, then calculates the HP using this formula:
Torqe x RPM
HP = -----------
5250
Where do we get that from? One foot lb of rotational torque at 5250 RPM is 33,000 ft/lb of torque.
So really when you drive what you are feeling is Torque, not HP. 👍
Luke
In a nutshell, i think what Luke is saying is that the force that pins you into the drivers seat is the power of the torque output. BHP is the power that the engine puts out in relation to overall speed.
One foot lb of rotational torque at 5250 RPM is 33,000 ft/lb of torque.
1ft/lb at 5250rpm is still 1ft/lb of torque...you don't get more torque simply by 'spinning it faster'. Torque is force * the lever arm, rpm's has nothing to do with it.
...unless I read your statement wrong...
Not necessarily speed, but rather the engines RPM's. But yes, other than that one thing that is what I was saying. 👍
Luke
RPM is the speed. Got no RPM you can't move.
Well yes, but when your going 60 in 3rd and the engine is revving at lets say 5500 RPM you are making X HP but, when you shift into forth, you are still going 60, but are now only getting X< HP at 3000 RPM (depending on the torque curve) ergo, 2 different engine RPM's at the same speed. While it is true that you get slightly different numbers in each gear due to the transmission rations. You are still making less HP at 3000 RPM than at 5500 RPM.
Luke
There is no HP without torque, 1 HP is defined as moving 33,000 ft/lb of torque in one minute. How did we get this? Work is defined as force times distance. Therefore lifting a 1 lb weight 1 foot gives us 1 ft/lb of torque. A man named Watt once examined that a horse could life a 550 pound weight 1 foot in 1 second. So one HP is 550 ft/lb of torque per second, or 33,000 ft/lb of torque. HP is actually found by a formula, coming from torque. When you put a car onto a DYNO all the DYNO measures is torque output, then calculates the HP using this formula:
Torqe x RPM
HP = -----------
5250
Where do we get that from? One foot lb of rotational torque at 5250 RPM is 33,000 ft/lb of torque.
So really when you drive what you are feeling is Torque, not HP. 👍
Luke
What is the definition of Horsepower? The rate at which torque is applied, right? So yes you're feeling torque, but you're feeling torque being applied very quickly over and over again, which is what I mean, which is essentially horsepower. If you where to apply 100,000,000 ft/lbs of torque at .00000000001 RPM you wouldn't feel much. There wouldn't be much movement, but that still a ridiculous amount of torque.
I just hate ignorant comments like, "torque is king", or "torque>horsepower". No, Horsepower tells you how torque is being used, and is the measurement that tells you how fast you can accelerate among other things. It also tells you how much energy your engine is outputting. Obviously energy is the key to getting things moving. The more energy you have, the faster things can move. You can convert HP to Watts, but you can't convert a torque figure alone to watts.
1 HP = 745.7 watts
RedsuinitWhat I meant to say is that if you rotate a one pound weight one full rotation (rotational torque) it moves 6.2832 feet, giving us 6.2832 ft/lb of torque per minute at 1 RPM, when we divide 33,000 ft/lb of torque per minute we get 5252 RPM. That is a more detailed explanation, hopefully I cleared all of that up!
Luke
GT_Fanaticdid you watch the Japanese guy from top secret tuners in the link I supplied in this thread. The guy is a nutter in a 1200 BHP Skyline. All respect to the guy, he's got the steel nerve to do what he does. We can all talk about torque this and BHP that, but this guy builds cars in a different league to anything i've seen. Ironically, all the cars he tunes are turbo powered. It's amazing what he can do to a stock street car.
NHRA Top Fuel Dragsters and Funny Cars use what, turbo, NA, or Supercharger? They use Superchargers, that should tell you something. POWER, on demand.
Turbo is the ultimate replacement for displacement, and when you add a supercharger to the mix, big blocks will weep in horror..
err.. nope. add supercharger to big block and you'll have a vortex in the fuel tank especially if the car has gearing that is meant for sporty driving instead of economy.