How to read torque curve graph

How are you supposed to read this?

Clearly the white line is horsepower.

Is the orange line the torque curve?

I don't fully understand the relationship between torque and horsepower. Isn't horsepower something to do with the relation between torque and rpm?

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youtube.com/watch?v=lpB1yR9Sz9Y
technologyandracing.blogspot.com.au/2011/02/one-robust-4g63-engine.html
evolutionm.net/forums/evo-dyno-tuning-results/447351-highest-hp-4g63-engine-2007-a.html
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>automatic

yes torque is on
don't try to understand horsepower it's not a really tangible unit
torque is the force applied to turn your wheels at a precise moment/rpm

horsepower is the overall energy your engine is producing

Torque is irellivent as the torque at the road changes with the gear so ignore it.

So in circuit racing and drag racing, drivers shift at redline, no?

That graph shows that peak torque is at 4000 rpm. Why would you stay in gear as the torque drops off?

Horizontal axis shows RPM.
Left vertical axis (orange) shows torque, so yes, orange line.
Right vertical axis (white) shows HP
You just read it like any other grap, you have a value on the horizontal RPM line and you look at the corresponding value on the graph, only there are 2 graphs, so enjoy.

I can't explain the exact difference between torque and HP, or rather, torque is pretty straight forward but HP is a little more abstract.

What? These tests row through the gears.

>don't try to understand horsepower it's not a really tangible unit
Lol you mean dont try to understand torque. Especially not when gearing is a thing.

Horsepower is the rate at which work is done...

Power increases. Power is what matters.

No a dyno pull is only done in one gear.