Quote:
Originally Posted by Slow-V6
So your rear wheel hp is not only based on how much power you have it is based on what gear ratio you are running? So with a lower gear you are not gaining more power it is just freeing up more power by being more eff?
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Gear ratio will drop out when calculating horsepower. RPM adjusts to make up for the extra torque in the equation.
Think of it this way. An engine on a stand will make an set amount of torque at a given RPM.
If you put that in a car with a manual transmission and put it in 6th gear at a stop you won't go anywhere. Not enough torque. Put it in first and it's smoke city. No change was made to the engine. It still makes the same amount of torque at a given RPM regardless of what's behind it. The torque is multiplied by the gears. But when you are calculating horsepower, RPM is factored in. With more torque there is less RPM so HP stays the same.
I'm sure you get the idea even though I'm sure I'm missing something.
Here's a proof of it done by someone more skilled than I:
http://craig.backfire.ca/img/gear-formulas.png