2014 Ultimate 1 Ton Challenge results

Turtle n Peeps wrote:
Why am I hung up on power?

Because you keep on saying things like:

This is why higher gears make more power, especially on turbo motors.

It's the second time you said gears make power. No they do not.

And you said before that:

At 2500 rpms that is like an additional 35hp... So yes it does make a difference.

So there you flat out said gears made 35 HP. :S


This is real simple. If gears made 35 HP like you said above link me up. Show me a chassis dyno run that shows more power being generated to the ground with shorter gears just like you said above. Should be easy to show............if you are correct.

I'm done if you can't show me a dyno run or even link me up to a thread showing your point.

You are mixing points, and cannot follow the conversation. Power is the correct term in both of those quotes, but thats not what this discussion is really about.

The comment about higher gears and more power was speaking directly to a dyno. Go dyno in 1st and 6th, which one makes more hp? The 6th gear run does, which goes directly inline with my comment on loading the motor on the dyno and NOT real world. Torque management aside the hp is the same and the torque to the wheels would be higher in 1st than 6th on the street.

The second comment is also about a chassis dyno and how they are effected by engine loading. To make 50 more ft/lbs of torque at 2500 rpms takes 35 more hp, you know the equation since you posted it. So you should have no problems understanding that at 2500 rpms 800 ft/lbs is 380 hp, and 850 ft/lbs is 405 hp... A difference of 35, weird right!. There you go , gears made hp... Um no, not really the point if that was to show the issues of a loading the engine on a chassis dyno, not real world power production. On a chassis dyno taller gearing allows the engine to make more hp, and more torque.. Not because of the gearing but because the load required to spin the tires is higher.

If a vehicle on the dyno is ran in 5th and makes 415/800 and then ran in 6th and makes 425/850 the hp curves are not identical. Which one do you think is more accurate? What do you think made the extra hp in the middle of the rpm band? I can tell you the gearing didn't do it, it just facilitated it.

Out of curiosity have you ever ran a vehicle on a chassis dyno? If yes where any of them a turbo diesel?

Forget hp and forget about the chassis dyno, they output torque based on rpm and hp made and do not display the actual torque at the wheel.. We also know that based on your equation above and the simple fact of gearing reduction. Since we know hp is constant thru gearing reduction it's easy to see how a chassis dyno does not measure wheel torque, but wheel hp that we can calculate engine torque (not wheel torque) from if a engine tachometer is used.

To further show how you cannot follow the conversation the 35hp comment was with a taller gear, not a shorter one. Go ahead, scroll back up and see for yourself.

I have my latest dyno sheets at work, I will look and see if I printed the one with a 5th and 6th run; however, it's completely irrelevant to the discussion about 4.10's and their effect on towing and rear wheel torque.