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Discussion Starter #1
Guys,
I have learned A TON on this website. Thanks! I've come a long way, but could you please help me with another dumb question...Would someone help me understand how you look at and interpret Torque and Horsepower graphs?

I think I understand "powerband" as where you expect your car to use its most effort. For a manual transmission, this occurs at a higher range than an auto.

So for a given transmission, gear ratio, and tire size you would determine where your powerband is? and build your engine to match? are you looking at tq or hp? where it peaks? or the area under the curve?

I apologize again for asking about something that is so basic...

BTW, my son gave me Desktop Dyno for Christmas so I've been making lots of graphs...other than more is better, I'm not sure which are better than others.

Thanks,
Scott
 

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You prolly already are reading from left to right on these graphs. You probably already see that about 5250 rpm , torque falls off but hp keeps moving up or steady to the desired rpm range. What is great about these desktop dyno programs,, is that you can either follow standard equiptment runs , especially in cam selection , or you can design your own. Its almost endless. One thing for sure,, you cant blow your engine doing this. You can pretty much see what equiptment moves your tq and hp bands up and down. Did I say anything you haven't already done?
 

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Hp = RPM x T/5252.

When RPM ='s 5252, Hp ='s T is why the Hp and the T curves crossover at 5252 rpm.

And if you want to consider such, a high rpm Hp motor just has more of the T curve over to the right of the crossover point or higher in the rpm scale is all!

This is why we say a low rpm motor is a torque motor b/c most of the T curve is to the left of the crossover point or lower down the rpm range.

pdq67
 

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Discussion Starter #4
ok, i hadn't noticed the 5252 crossover...interesting.
pdq, I'm wrapping my brain around the high/low rpm comments. So if you have two otherwise equal motors, one is high rpm/low torque, and the other is low rpm/high torque what is the application of each? If you are pulling a boat, you want torque, when do you want high rpm?
 
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