How Much Does Wheels/Gear Cost You?
Originally Posted by mrr23
remember science class where they explained about energy. for instance. you can lift a 1# rock with your hand easily. very little energy produced to move an object. now try to move a 100# rock. it takes more energy to move the object.
now torque is what makes horsepower. it takes less torque to rotate 4.10 gears versus 3.23 gears. less torque calculates to less horsepower.
now torque is what makes horsepower. it takes less torque to rotate 4.10 gears versus 3.23 gears. less torque calculates to less horsepower.
Crank hp/tq isn't dependent on the drivetrain - the amount that gets to the ground definitely is. That's why I always thought it was the increased parasitic loss from the metal-to-metal contact with more teeth on the ring gear
Originally Posted by LS1_Disciple
Are you sure about this? Using that logic, if I could theoretically put 1000:1 gears in the rear, then my engine would make 0 hp?
Originally Posted by LS1_Disciple
Crank hp/tq isn't dependent on the drivetrain - the amount that gets to the ground definitely is.
Originally Posted by LS1_Disciple
Are you sure about this? Using that logic, if I could theoretically put 1000:1 gears in the rear, then my engine would make 0 hp?
Originally Posted by LS1_Disciple
Crank hp/tq isn't dependent on the drivetrain - the amount that gets to the ground definitely is.
which is why you cannot ever use chassis dyno numbers to figure out what you have at the motor. i just love all the people that say GM underrated the motors becuase look at my chassis dyno numbers.
Originally Posted by mrr23
if energy needed to move something was constant, no matter what is inbetween the motor and the ground, we'd all be running 1 hp motors and doing 4s.
Changing the drivetrain only changes how much of that ends up on the ground.
engine dynos 'load' the motor. they don't just free rev it. meaning they add resistance to movement. you can make a motor produce just about any number you want within it's limitations. let's say you dyno a motor with a resistance to make it rev 300 rpms per second. it'll make xxx hp and xxx tq. now let's loosen it up to 500 rpms per second. less resistance means less torque needed to move the object. and here's a perfect example. my 86TA on a mustang dyno that uses eddy current braking to load the wheels. people kept saying how much more accurate the numbers were on a mustang dyno vs dynojet because of the ability to 'load' the dyno. with absolutely no changes to the motor in the car, we changed the cars weight from 3050 lbs to 3550 lbs. now, how did i gain power if nothing was done to the motor or car itself?
Originally Posted by LS1_Disciple
But if your engine makes 400hp, and you change the trans or rearend gears, the engine will still make 400hp.
Changing the drivetrain only changes how much of that ends up on the ground.
Changing the drivetrain only changes how much of that ends up on the ground.
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